CN109944584B - Method and device for acquiring reserve of reservoir body in carbonate rock oil well - Google Patents
Method and device for acquiring reserve of reservoir body in carbonate rock oil well Download PDFInfo
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- CN109944584B CN109944584B CN201711375455.1A CN201711375455A CN109944584B CN 109944584 B CN109944584 B CN 109944584B CN 201711375455 A CN201711375455 A CN 201711375455A CN 109944584 B CN109944584 B CN 109944584B
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 68
- 239000003129 oil well Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000011435 rock Substances 0.000 title claims abstract description 27
- 239000010779 crude oil Substances 0.000 claims abstract description 174
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- -1 slots Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a method and a device for acquiring reserve of a reservoir body in a carbonate rock oil well, wherein the method comprises the following steps: acquiring the initial crude oil volume and the initial wellhead pressure of a carbonate oil well; after liquid is injected into a first reservoir in the reservoir set, acquiring the crude oil volume and the wellhead pressure of an ith reservoir in the reservoir set, wherein the reservoir set comprises N sequentially communicated reservoirs, and the first reservoir is a first reservoir in the reservoir set; n is an integer greater than or equal to 2, i is greater than or equal to 1 and less than or equal to N; and determining the reserve of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir and the wellhead pressure. The method and the device for acquiring the reserve of the reservoir body in the carbonate rock oil well improve the acquisition efficiency of the reserve of the reservoir body in the carbonate rock oil well.
Description
Technical Field
The invention relates to the technical field of oil field oil extraction engineering, in particular to a method and a device for acquiring reserve of a reservoir body in a carbonate rock oil well.
Background
Carbonate rock is a generic term for rock composed of precipitated carbonate, mainly limestone and dolomite. Carbonate reservoirs are highly heterogeneous, mainly secondary voids, and the slots form irregularities in and between layers, and are therefore called reservoirs to emphasize their heterogeneity.
For example, in massive or large casing carbonate rocks where the primary porosity has disappeared, the erosion pores, slots, holes are almost the only reservoir spaces, the morphology of which is extremely irregular and its shape can only be described in rough approximation. The carbonate matrix becomes a plug (cap) and it is clear that the plug is not layered but irregular. In general, there are connected and disconnected modes between reservoirs, and the connected reservoir can be used as a reservoir, but for the disconnected reservoir, because the pressure of the used reservoir is continuously reduced during production, pressure difference can be approximately formed between a plurality of sets of reservoirs, and when the pressure difference breaks through the resistance between them, the reservoirs are connected. For a single reservoir, the reserves can be calculated through well testing and a material balance method, but the needed parameters are more, and for a second reservoir, a third reservoir and the like, continuous testing is needed to obtain related parameters, so that the cost is higher, and the reserves of the reservoir are difficult to obtain in a short time.
Therefore, the acquisition of the reserves of the reservoir in the carbonate well is inefficient with the existing reserve acquisition methods.
Disclosure of Invention
The invention provides a method and a device for acquiring the reserve of a reservoir body in a carbonate rock oil well, which are used for improving the acquisition efficiency of the reserve of the reservoir body in the carbonate rock oil well.
The embodiment of the invention provides a method for acquiring reserve of a reservoir body in a carbonate rock oil well, which comprises the following steps:
acquiring the initial crude oil volume and the initial wellhead pressure of a carbonate oil well;
after injecting liquid into a first reservoir in a reservoir set, acquiring the crude oil volume and the wellhead pressure of an ith reservoir in the reservoir set, wherein the reservoir set comprises N sequentially connected reservoirs, and the first reservoir is a first reservoir in the reservoir set; n is an integer greater than or equal to 2, i is greater than or equal to 1 and less than or equal to N;
determining a reserve of the ith reservoir based on the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir, and a wellhead pressure.
In an embodiment of the present invention, when i is greater than or equal to 2, the determining the reserve of the ith reservoir from the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir, and a wellhead pressure comprises:
acquiring the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir;
determining a reserve of the ith reservoir based on the initial crude oil volume, the initial wellhead pressure, the crude oil volume and wellhead pressure of the ith reservoir, and the crude oil volume and wellhead pressure of each reservoir prior to the ith reservoir.
In an embodiment of the present invention, said determining the reserves of the ith reservoir from the initial crude oil volume, the initial wellhead pressure, the crude oil volume and wellhead pressure of the ith reservoir, and the crude oil volume and wellhead pressure of each reservoir preceding the ith reservoir comprises:
determining a curve slope corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of the ith reservoir;
determining a curve slope corresponding to each reservoir before the ith reservoir according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of each reservoir before the ith reservoir;
and determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir and the curve slope corresponding to each reservoir before the ith reservoir.
In an embodiment of the present invention, the determining the reserve of the ith reservoir according to the slope of the curve corresponding to the ith reservoir and the slope of the curve corresponding to each reservoir before the ith reservoir includes:
and determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir, the curve slope corresponding to each reservoir before the ith reservoir and the compression coefficient of the crude oil.
In an embodiment of the present invention, the determining the reserve of the ith reservoir according to the slope of the curve corresponding to the ith reservoir, the slope of the curve corresponding to each reservoir before the ith reservoir, and the compressibility of the crude oil includes:
according to
Determining a reserve of the ith reservoir;
wherein Q isiRepresenting the reserve of the i-th reservoir, KiRepresents the slope of the curve, K, corresponding to the ith reservoiri-1Represents the slope of the curve, K, corresponding to the i-1 th reservoir1Represents the slope of the curve, C, for the 1 st reservoir0Representing the compressibility of the crude oil.
In an embodiment of the present invention, the determining a slope of a curve corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and wellhead pressure of the ith reservoir includes:
according to
Determining a slope of a curve corresponding to the ith reservoir;
wherein, KiRepresents the slope of the curve, V, corresponding to the ith reservoir0Representing the initial crude oil volume, P0Indicating the initial wellhead pressure, ViCrude oil volume, P, of the ith reservoiriRepresenting the wellhead pressure of the ith reservoir.
The embodiment of the invention also provides a device for acquiring the reserve of the reservoir body in the carbonate rock oil well, which comprises:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the initial crude oil volume and the initial wellhead pressure of a carbonate oil well;
the acquiring unit is further configured to acquire a crude oil volume and a wellhead pressure of an ith reservoir in the reservoir set after injecting a liquid into a first reservoir in the reservoir set, wherein the reservoir set comprises N sequentially connected reservoirs, and the first reservoir is a first reservoir in the reservoir set; n is an integer greater than or equal to 2, i is greater than or equal to 1 and less than or equal to N;
and the determining unit is used for determining the reserve volume of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir and the wellhead pressure.
In an embodiment of the present invention, the obtaining unit is further configured to obtain a crude oil volume and a wellhead pressure of each reservoir before the ith reservoir;
the determining unit is specifically used for determining the reserve volume of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume and the wellhead pressure of the ith reservoir, and the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir.
In an embodiment of the present invention, the determining unit is specifically configured to determine a slope of a curve corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and wellhead pressure of the ith reservoir; determining a curve slope corresponding to each reservoir body before the ith reservoir body according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of each reservoir body before the ith reservoir body; and determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir and the curve slope corresponding to each reservoir before the ith reservoir.
In an embodiment of the present invention, the determining unit is specifically configured to determine the reserve of the i-th reservoir according to the slope of the curve corresponding to the i-th reservoir, the slope of the curve corresponding to each reservoir before the i-th reservoir, and the compressibility of the crude oil.
In an embodiment of the invention, the determining unit is specifically configured to determine the position of the mobile terminal according to
Determining a reserve of the ith reservoir;
wherein Q isiRepresenting the reserve of the i-th reservoir, KiRepresents the slope of the curve, K, corresponding to the ith reservoiri-1Represents the slope of the curve, K, corresponding to the i-1 th reservoir1Represents the slope of the curve, C, for the 1 st reservoir0Representing the compressibility of the crude oil.
In an embodiment of the invention, the determining unit is specifically configured to determine the position of the mobile terminal according to
Determining a slope of a curve corresponding to the ith reservoir;
wherein, KiRepresents the slope of the curve, V, corresponding to the ith reservoir0Representing the initial crude oil volume, P0Indicating the initial wellhead pressure, ViCrude oil volume, P, of the ith reservoiriRepresenting the wellhead pressure of the ith reservoir.
According to the method and the device for acquiring the reserve volume of the reservoir body in the carbonate rock oil well, the initial crude oil volume and the initial wellhead pressure of the carbonate rock oil well are acquired, and after liquid is injected into a first reservoir body in a reservoir body set, the crude oil volume and the wellhead pressure of an ith reservoir body in the reservoir body set are acquired; and then determining the reserve volume of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir and the wellhead pressure. Therefore, the method and the device for acquiring the reserve of the reservoir in the carbonate rock oil well provided by the embodiment of the invention are determined according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir and the wellhead pressure when the reserve of the ith reservoir is acquired, so that the acquisition efficiency of the reserve of the reservoir in the carbonate rock oil well is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram of a method for obtaining a reserve of a reservoir in a carbonate well according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another method for obtaining a reserve of a reservoir in a carbonate well according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a first reservoir injected with a fluid according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another method of obtaining the reserve of a reservoir in a carbonate well according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of three reservoirs provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of pressure and injection volume according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a device for acquiring reserve of a reservoir in a carbonate well according to an embodiment of the present invention.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, for a single reservoir body, the reserve can be calculated through a well testing and material balancing method, but the needed parameters are more, and for a second reservoir body, a third reservoir body and the like, the related parameters need to be obtained through continuous testing, so that the cost is higher, the reserve of the reservoir body is difficult to obtain in a short time, and the acquisition efficiency of the reserve of the reservoir body in a carbonate oil well is not high. In order to improve the acquisition efficiency of the reserves of the reservoirs in the carbonate rock oil well, the embodiment of the invention provides a reserve acquisition method of the reservoirs in the carbonate rock oil well, which comprises the steps of acquiring the initial crude oil volume and the initial wellhead pressure of the carbonate rock oil well when acquiring the reserves of the reservoirs in the carbonate rock oil well, and acquiring the crude oil volume and the wellhead pressure of the ith reservoir in the reservoir set after injecting liquid into the first reservoir in the reservoir set; and then determining the reserve of the ith reservoir body according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir body and the wellhead pressure, thereby improving the acquisition efficiency of the reserve of the reservoir body in the carbonate oil well.
The technical solution of the present invention and how to solve the above technical problems will be described in detail with specific examples. The following specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a method for acquiring a reserve of a reservoir in a carbonate well according to an embodiment of the present invention, where the method for acquiring a reserve of a reservoir in a carbonate well may be performed by a reserve acquisition device of a reservoir in a carbonate well, and the reserve acquisition device of a reservoir in a carbonate well may be separately installed or integrated in another device. Referring to fig. 1, the method for obtaining the reserve of the reservoir in the carbonate well may include:
s101, obtaining the initial crude oil volume and the initial wellhead pressure of the carbonate oil well.
The initial crude oil volume and the initial wellhead pressure of the carbonate oil well refer to the crude oil volume and the initial wellhead pressure of the carbonate oil well before liquid is injected into the carbonate oil well. For example, in the embodiment of the present invention, the liquid may be water, and water is used as the injected liquid because water is low in cost and has incompressibility. Of course, the liquid may be replaced by gas, and the liquid may be specifically set according to actual needs, and here, the embodiment of the present invention is described by taking water as an example, but the present invention is not limited thereto.
S102, after liquid is injected into the first reservoir in the reservoir set, the crude oil volume and the wellhead pressure of the ith reservoir in the reservoir set are obtained.
The device comprises a reservoir set and a control unit, wherein the reservoir set comprises N sequentially communicated reservoirs, and a first reservoir is a first reservoir in the reservoir set; n is an integer of 2 or more, and i is 1 or more and N or less.
After injecting liquid into a first reservoir in the reservoir set, when i is equal to 1, acquiring the crude oil volume and the wellhead pressure of the first reservoir; when i is greater than 1, it is necessary to obtain the crude oil volume and wellhead pressure of the ith reservoir.
S103, determining the reserve volume of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir and the wellhead pressure.
After the initial crude oil volume and the initial wellhead pressure of the carbonate oil well and the crude oil volume and the wellhead pressure of the ith reservoir body after the liquid is injected into the first reservoir body in the reservoir body set are respectively obtained through the steps S101 and S102, the reserve capacity of the ith reservoir body can be determined according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume and the wellhead pressure of the ith reservoir body, and therefore the acquisition efficiency of the reserve capacity of the reservoir body in the carbonate oil well is improved.
According to the method and the device for acquiring the reserve volume of the reservoir body in the carbonate rock oil well, the initial crude oil volume and the initial wellhead pressure of the carbonate rock oil well are acquired, and after liquid is injected into a first reservoir body in a reservoir body set, the crude oil volume and the wellhead pressure of an ith reservoir body in the reservoir body set are acquired; and then determining the reserve volume of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir and the wellhead pressure. Therefore, the method and the device for acquiring the reserve of the reservoir in the carbonate rock oil well provided by the embodiment of the invention are determined according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir and the wellhead pressure when the reserve of the ith reservoir is acquired, so that the acquisition efficiency of the reserve of the reservoir in the carbonate rock oil well is improved.
Based on the example shown in fig. 1, in order to more clearly illustrate how to determine the reserves of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir, and the wellhead pressure, in particular, in the calculation process, the reserves of the ith reservoir can be divided into two scenarios.
In a first scenario, when i is equal to 1, it is described that there is only one reservoir in the carbonate well, and when acquiring the reserve of the first reservoir, as shown in fig. 2, fig. 2 is a schematic diagram of another method for acquiring the reserve of the reservoir in the carbonate well according to an embodiment of the present invention, the method for acquiring the reserve of the reservoir in the carbonate well may include:
s201, obtaining the initial crude oil volume and the initial wellhead pressure of the carbonate oil well.
S202, after liquid is injected into a first reservoir in the reservoir set, acquiring the crude oil volume and the wellhead pressure of the first reservoir in the reservoir set.
Referring to fig. 3, fig. 3 is a schematic diagram of injecting liquid into a first reservoir according to an embodiment of the present invention, wherein the initial crude oil volume of a carbonate oil well before the liquid is injected into the first reservoir is V0Initial wellhead pressure of P0After the injection of the liquid, the crude oil volume of the first reservoir becomes V1Wellhead pressure becomes P1。
S203, determining the curve slope corresponding to the first reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and wellhead pressure of the first reservoir.
After the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and wellhead pressure of the first reservoir are respectively obtained through the above S201 and S202, the curve slope corresponding to the first reservoir can be determined according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and wellhead pressure of the first reservoir. Optionally, in this embodiment of the present invention, the determining, at S203, a slope of a curve corresponding to the first reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and wellhead pressure of the first reservoir may include:
according to
Determining a slope of a curve corresponding to the first reservoir.
Wherein, K1Represents the slope of the curve, V, corresponding to the first reservoir0Representing the initial crude oil volume, P0Indicating the initial wellhead pressure, V1Crude oil volume, P, of the first reservoir1Representing a wellhead pressure of the first reservoir.
And S204, determining the reserve of the first reservoir according to the curve slope corresponding to the first reservoir and the compression coefficient of the crude oil.
After determining the slope of the curve corresponding to the first reservoir, the reserve of the first reservoir may be determined based on the slope of the curve corresponding to the first reservoir and the compressibility of the crude oil. Optionally, in this embodiment of the present invention, the determining the reserves of the first reservoir by the slope of the curve corresponding to the first reservoir and the compressibility of the crude oil in S204 may include:
according to
Determining a reserve of the first reservoir.
Wherein Q is1Representing the reserve of said first reservoir, C0Represents the compressibility of the crude oil, and C0Is a constant value, usually C0＝10*10-4。
Therefore, in the embodiment of the invention, when i is equal to 1, when the reserve of the first reservoir is obtained, the slope of the curve corresponding to the first reservoir is determined according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the first reservoir and the wellhead pressure, and then the reserve of the first reservoir is determined according to the slope of the curve corresponding to the first reservoir and the compressibility of the crude oil, so that the obtaining efficiency of the reserve of the reservoir in the carbonate oil well is improved.
In a second scenario, when i is greater than 1, it indicates that there are multiple reservoirs in the carbonate well, and when acquiring the reserve of the ith reservoir in the multiple reservoirs, as shown in fig. 4, fig. 4 is a schematic diagram of a reserve acquisition method for a reservoir in a carbonate well provided by an embodiment of the present invention, the reserve acquisition method for a reservoir in a carbonate well may include:
s401, obtaining the initial crude oil volume and the initial wellhead pressure of the carbonate oil well.
S402, after injecting liquid into a first reservoir in the reservoir set, acquiring the crude oil volume and the wellhead pressure of the ith reservoir in the reservoir set and the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir.
For example, when i is equal to 3, please refer to fig. 5, fig. 5 is a schematic diagram of three reservoirs according to an embodiment of the present invention, and after the first reservoir is injected with liquid, the crude oil volumes and the wellhead pressures of the first reservoir, the second reservoir and the third reservoir are all changed. When there are 3 reservoirs, the first reservoir volume Q1See the embodiment shown in FIG. 2, in determining the reserve Q of the second reservoir2It is necessary to obtain the crude oil volume V of the second reservoir after the first reservoir has been injected with liquid2And wellhead pressure P2And a crude oil volume V of the first reservoir1And wellhead pressure P1In determining the reserve Q of the third reservoir3It is necessary to obtain the crude oil volume V of the third reservoir after the first reservoir has been injected with liquid3And wellhead pressure P3And the crude oil volume and wellhead pressure of the second reservoir and the first reservoir.
And S403, determining the slope of the curve corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and the wellhead pressure of the ith reservoir.
After the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and the wellhead pressure of the ith reservoir are respectively obtained through the steps S401 and S402, the curve slope corresponding to the ith reservoir can be determined according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume and the wellhead pressure of the ith reservoir. Optionally, in this embodiment of the present invention, the determining, in S403, a slope of a curve corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and the wellhead pressure of the ith reservoir may include:
according to
The slope of the curve corresponding to the ith reservoir is determined.
Wherein, KiRepresents the slope of the curve, V, corresponding to the ith reservoir0Denotes the initial crude oil volume, P0Indicating the initial wellhead pressure, ViCrude oil volume, P, of the ith reservoiriRepresenting the wellhead pressure of the ith reservoir.
Illustratively, the slope of the curve for the third reservoir is
And S404, determining the curve slope corresponding to each reservoir before the ith reservoir according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of each reservoir before the ith reservoir.
It should be noted that, in determining the slope of the curve corresponding to each reservoir before the ith reservoir, please refer to the formula shown in S403
When the slope of the curve corresponding to the i-1 th reservoir is obtained, the slope can be obtained according to
Get the i-1 stThe slope of the curve corresponding to the reservoir. Wherein, Ki-1Represents the slope of the curve, V, corresponding to the i-1 th reservoiri-1Crude oil volume, P, of the i-1 th reservoiri-1Representing the wellhead pressure of the ith-1 reservoir, and similarly, the slope of the curve corresponding to each reservoir prior to the ith reservoir may be determined.
Illustratively, the slope of the curve for the second reservoir is
The slope of the curve corresponding to the first reservoir is
Referring to fig. 6, fig. 6 is a schematic diagram of pressure and injection amount according to an embodiment of the invention.
S405, determining the reserve of the ith reservoir according to the slope of the curve corresponding to the ith reservoir, the slope of the curve corresponding to each reservoir before the ith reservoir and the compression coefficient of the crude oil.
After the slope of the curve corresponding to the ith reservoir and the slope of the curve corresponding to each reservoir before the ith reservoir are obtained through S403 and S404, respectively, the reserve of the ith reservoir can be determined according to the slope of the curve corresponding to the ith reservoir, the slope of the curve corresponding to each reservoir before the ith reservoir and the compressibility of the crude oil. Optionally, the step S405 of determining the reserve of the ith reservoir according to the slope of the curve corresponding to the ith reservoir, the slope of the curve corresponding to each reservoir before the ith reservoir, and the compressibility of the crude oil may include:
according to
Determining a reserve of the ith reservoir;
wherein Q isiRepresenting the reserve of the i-th reservoir, KiRepresents the slope of the curve corresponding to the ith reservoir, Ki-1Represents the slope of the curve, K, corresponding to the i-1 th reservoir1Represents the slope of the curve, C, for the 1 st reservoir0Representing the compressibility of the crude oil.
In obtaining reserve Q of the third reservoir3Can be according to
Determining a reserve of the 3 rd reservoir; in obtaining reserve Q of the second reservoir2Can be based on
The reserve of the 2 nd reservoir is determined. Wherein Q is3Denotes the reserve of the 3 rd reservoir, K3Represents the slope of the curve, K, corresponding to the 3 rd reservoir2Represents the slope of the curve, K, corresponding to reservoir 21Representing the slope of the curve for reservoir 1.
Therefore, in the embodiment of the invention, when i is greater than 1, when the reserve of the ith reservoir is acquired, the slope of the curve corresponding to the ith reservoir is determined according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume and the wellhead pressure of the ith reservoir, the slope of the curve corresponding to each reservoir before the ith reservoir is determined according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir, and the reserve of the ith reservoir is determined according to the slope of the curve corresponding to the ith reservoir, the slope of the curve corresponding to each reservoir before the ith reservoir and the compression coefficient of the crude oil, so that the acquisition efficiency of the reserve of the reservoir in the carbonate rock oil well is improved.
Fig. 7 is a schematic structural diagram of a device 70 for acquiring the reserve of a reservoir in a carbonate well according to an embodiment of the present invention, and referring to fig. 7, the device 70 for acquiring the reserve of a reservoir in a carbonate well may include:
an obtaining unit 701 is configured to obtain an initial crude oil volume and an initial wellhead pressure of the carbonate oil well.
The acquiring unit 701 is further configured to acquire a crude oil volume and a wellhead pressure of an ith reservoir in the reservoir set after injecting a liquid into a first reservoir in the reservoir set, where the reservoir set includes N sequentially connected reservoirs, and the first reservoir is a first reservoir in the reservoir set; n is an integer of 2 or more, and i is 1 or more and N or less.
A determining unit 702 for determining a reserve of the ith reservoir based on the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir, and the wellhead pressure.
Optionally, the obtaining unit 701 is further configured to obtain a crude oil volume and a wellhead pressure of each reservoir before the ith reservoir.
The determining unit 702 is specifically configured to determine the reserve of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume and the wellhead pressure of the ith reservoir, and the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir.
Optionally, the determining unit 702 is specifically configured to determine a slope of a curve corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and the wellhead pressure of the ith reservoir; determining the curve slope corresponding to each reservoir body before the ith reservoir body according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of each reservoir body before the ith reservoir body; and determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir and the curve slope corresponding to each reservoir before the ith reservoir.
Optionally, the determining unit 702 is specifically configured to determine the reserve of the ith reservoir according to the slope of the curve corresponding to the ith reservoir, the slope of the curve corresponding to each reservoir before the ith reservoir, and the compressibility of the crude oil.
Optionally, the determining unit 702 is specifically configured to determine according to
Determining a reserve of the ith reservoir.
Wherein Q isiRepresenting the reserve of the i-th reservoir, KiRepresents the slope of the curve corresponding to the ith reservoir, Ki-1Represents the slope of the curve, K, corresponding to the i-1 th reservoir1Represents the slope of the curve, C, for the 1 st reservoir0Representing the compressibility of the crude oil.
Optionally, the determining unit 702 is specifically configured to determine according to
The slope of the curve corresponding to the ith reservoir is determined.
Wherein, KiRepresents the slope of the curve, V, corresponding to the ith reservoir0Denotes the initial crude oil volume, P0Indicating the initial wellhead pressure, ViCrude oil volume, P, of the ith reservoiriRepresenting the wellhead pressure of the ith reservoir.
The device 70 for acquiring the reserve of the reservoir in the carbonate oil well can correspondingly execute the technical scheme of the method for acquiring the reserve of the reservoir in the carbonate oil well according to any embodiment, and the implementation principle and the technical effect are similar, and are not described herein again.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (8)
1. A method of obtaining a reserve of a reservoir in a carbonate well, comprising:
acquiring the initial crude oil volume and the initial wellhead pressure of a carbonate oil well;
after injecting liquid into a first reservoir in a reservoir set, acquiring the crude oil volume and the wellhead pressure of an ith reservoir in the reservoir set, wherein the reservoir set comprises N sequentially connected reservoirs, and the first reservoir is a first reservoir in the reservoir set; n is an integer greater than or equal to 2, i is greater than or equal to 1 and less than or equal to N;
according to
Determining the slope of a curve corresponding to the ith reservoir;
wherein, KiRepresents the slope of the curve, V, corresponding to the ith reservoir0Representing the initial crude oil volume, P0Representing said initial wellhead pressure, ViRepresents the crude oil volume, P, of the ith reservoiriRepresenting a wellhead pressure of the ith reservoir;
according to
Determining a reserve of the ith reservoir;
wherein Q isiRepresenting the reserve of the i-th reservoir, KiRepresents the slope of the curve, K, corresponding to the ith reservoiri-1Represents the slope of the curve, K, corresponding to the i-1 th reservoir1Represents the slope of the curve, C, for the 1 st reservoir0Representing the compressibility of the crude oil.
2. The method of claim 1, wherein when i is greater than or equal to 2, comprising:
acquiring the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir;
determining a reserve of the ith reservoir based on the initial crude oil volume, the initial wellhead pressure, the crude oil volume and wellhead pressure of the ith reservoir, and the crude oil volume and wellhead pressure of each reservoir prior to the ith reservoir.
3. The method of claim 2, wherein said determining a reserve of said ith reservoir from said initial crude oil volume, said initial wellhead pressure, said crude oil volume and wellhead pressure of said ith reservoir, and said crude oil volume and wellhead pressure of each reservoir prior to said ith reservoir comprises:
determining a curve slope corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of the ith reservoir;
determining a curve slope corresponding to each reservoir before the ith reservoir according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of each reservoir before the ith reservoir;
and determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir and the curve slope corresponding to each reservoir before the ith reservoir.
4. The method of claim 3, wherein said determining the reservoir volume of the ith reservoir from the slope of the curve corresponding to the ith reservoir and the slope of the curve corresponding to each reservoir preceding the ith reservoir comprises:
and determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir, the curve slope corresponding to each reservoir before the ith reservoir and the compression coefficient of the crude oil.
5. A device for obtaining the reserve of a reservoir in a carbonate well, comprising:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the initial crude oil volume and the initial wellhead pressure of a carbonate rock oil well;
the acquiring unit is further configured to acquire a crude oil volume and a wellhead pressure of an ith reservoir in the reservoir set after injecting a liquid into a first reservoir in the reservoir set, wherein the reservoir set comprises N sequentially connected reservoirs, and the first reservoir is a first reservoir in the reservoir set; n is an integer greater than or equal to 2, i is greater than or equal to 1 and less than or equal to N;
a determining unit for determining the reserve of the ith reservoir from the initial crude oil volume, the initial wellhead pressure, the crude oil volume of the ith reservoir, and a wellhead pressure;
the determination unit is specifically used for determining
Determining a slope of a curve corresponding to the ith reservoir;
wherein, KiRepresents the slope of the curve, V, corresponding to the ith reservoir0Denotes the initial crude oil volume, P0Indicating the initial wellhead pressure, ViRepresents the crude oil volume, P, of the ith reservoiriRepresenting the wellhead pressure of the ith reservoir;
the determination unit is further specifically configured to
Determining a reserve of the ith reservoir;
wherein Q isiDenotes the reserve of the ith reservoir, KiRepresents the slope of the curve corresponding to the ith reservoir, Ki-1Represents the slope of the curve, K, corresponding to the i-1 th reservoir1Represents the slope of the curve, C, for the 1 st reservoir0Representing the compressibility of the crude oil.
6. The apparatus of claim 5,
the acquisition unit is further used for acquiring the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir;
the determining unit is specifically used for determining the reserve volume of the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, the crude oil volume and the wellhead pressure of the ith reservoir, and the crude oil volume and the wellhead pressure of each reservoir before the ith reservoir.
7. The apparatus of claim 6,
the determining unit is specifically configured to determine a slope of a curve corresponding to the ith reservoir according to the initial crude oil volume, the initial wellhead pressure, and the crude oil volume and wellhead pressure of the ith reservoir; determining a curve slope corresponding to each reservoir body before the ith reservoir body according to the initial crude oil volume, the initial wellhead pressure and the crude oil volume and wellhead pressure of each reservoir body before the ith reservoir body; and determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir and the curve slope corresponding to each reservoir before the ith reservoir.
8. The apparatus of claim 7,
the determining unit is specifically used for determining the reserve of the ith reservoir according to the curve slope corresponding to the ith reservoir, the curve slope corresponding to each reservoir before the ith reservoir and the compressibility of the crude oil.
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