CN106837273A - The double solution cavity Reservoir Body water injection indication curve interpretation models of Carbonate Reservoir - Google Patents
The double solution cavity Reservoir Body water injection indication curve interpretation models of Carbonate Reservoir Download PDFInfo
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- CN106837273A CN106837273A CN201710019917.XA CN201710019917A CN106837273A CN 106837273 A CN106837273 A CN 106837273A CN 201710019917 A CN201710019917 A CN 201710019917A CN 106837273 A CN106837273 A CN 106837273A
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- 239000007924 injection Substances 0.000 title claims abstract description 54
- 238000002347 injection Methods 0.000 title claims abstract description 54
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 12
- 210000000476 body water Anatomy 0.000 title claims abstract description 7
- 239000000243 solution Substances 0.000 title abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000003921 oil Substances 0.000 claims abstract description 34
- 239000010779 crude oil Substances 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000008398 formation water Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 2
- 230000001186 cumulative effect Effects 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract 1
- 235000019994 cava Nutrition 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention provides a kind of Carbonate Reservoir double solution cavity Reservoir Body water injection indication curve interpretation models, i.e., when oil reservoir injects certain water NWWhen, pressure is with the function model of cumulative water injected：The model can calculate water filling for the mutual profit supply exchange situation of two sets of solution cavity Reservoir Bodies during oil.Improved new model primary condition more meets the truth of many Reservoir Bodies of Carbonate Reservoir discrete type, water filling is actually closer with mining site for injection water retaining in reservoir change during oil, can tentatively judge Reservoir Body type using theoretical model, more accurately determine two sets of volumes of solution cavity Reservoir Body volume, crude oil and stratum water, and analyze many round water fillings for profit exchange situation between two sets of solution cavity Reservoir Bodies during oil.
Description
Technical Field
The invention relates to the technical field of oil reservoir geology and development, in particular to a carbonate reservoir double-karst-cave reservoir body water injection indication curve interpretation model.
Background
At present, the traditional theoretical research of water injection indication curves mostly focuses on a linear indication curve model with the injection pressure linearly increasing along with the accumulated injection amount, and the actual water injection indication curves in the field often have the condition of slope reduction after curve turning, which represents that the well water injection waves and actively uses two or more sets of reservoirs, and the intensive research of the connotation meaning represented by the indication curves is necessary.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a carbonate reservoir double-karst-cave reservoir body water injection indication curve interpretation model.
A carbonate rock oil reservoir double-karst-cave reservoir body water injection indication curve interpretation model is characterized in that when the oil reservoir is injected with a certain water quantity NWThe function model of pressure and accumulated water injection is:
wherein,
N1is cavern 1 crude oil volume, m3；
N2Crude oil volume of cavern 2, m3；
NW0The accumulated water injection quantity m when water waves are injected to the second set of reservoir bodies in the process of replacing oil by water injection3；
BwIs the volume coefficient, decimal, of water;
Boithe volume coefficient and decimal of the crude oil under the original pressure;
R1the volume ratio of water to oil of the karst cave 1 is small;
Cois the compression factor of crude oil, MPa-1；
p0For the formation pressure before oil is replaced by water injection, MPa；
CwIs the compressibility factor of formation water, MPa-1。
Through the change of the slope of the water injection indication curve of a plurality of turns (more than 3 turns) and the oil production and water production data between the water injection turns counted by the production data, the equation can be solved to calculate: volume N of cavernous reservoir 1,21、N2And water-to-oil volume ratio R1And R2。
Further, as described above, in the carbonate reservoir double-cavern reservoir water injection indication curve interpretation model, when the elastic energy of water in the cavern is not considered, that is, the volume coefficient of water is considered to be constant 1, the function model of pressure and accumulated water injection is simplified as follows:
the method takes a double-karst-cave reservoir body model as a research target, and the influence of two sets of karst-cave reservoir bodies on the water injection indication curve form is successively used in the research of the water injection process. The new model can be used for calculating the proportion of the respective volume of the two sets of karst cave reservoirs so as to calculate the respective corresponding volume, and in addition, the new model can consider the influence of the elastic energy of the water phase on the water injection indication curve form, so that the new model is suitable for calculating the oil-water volume of the reservoirs under the following two conditions: the initial conditions in the two sets of karst cave reservoirs are pure oil or oil-water coexistence, wherein the oil-water coexistence comprises the condition that any one or both of the karst cave reservoirs are oil-water coexistence; and the water storage rate in any karst cave reservoir body gradually changes in the later water injection oil replacement process. Therefore, the model can calculate the mutual oil-water supply and exchange condition of the two karst cave reservoirs in the water injection and oil replacement process. The initial conditions of the improved new model are more consistent with the real conditions of the discrete multi-reservoir bodies of the carbonate reservoir, the change of the water storage rate in the oil-replacing process by water injection is closer to the actual conditions of a mine field, the type of the reservoir bodies can be preliminarily judged by utilizing the theoretical model, the volumes of two sets of karst cave reservoir bodies and the volumes of crude oil and formation water can be more accurately determined, and the oil-water exchange condition between the two sets of karst cave reservoir bodies in the multi-round oil-replacing process by water injection is analyzed.
Drawings
FIG. 1 waterflooding indicating curve for a double cavern reservoir (different second cavern volume N)2)；
FIG. 2 waterflooding indicating curve for a double cavern reservoir (different first cavern volume N)1)。
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the double-cave model, the fracture between the two caves is assumed to only play a role in diversion, the caves are the main reservoir bodies, and the reservoir performance of the fracture is neglected. Suppose the original volumes of caverns 1 and 2 are Vp1,Vp2. The volume of the crude oil in the karst cave 1 is Voi1Volume of formation water is Vwi1Volume of crude oil in karst cave 2 is Voi2Volume of formation water is Vwi2And respectively defining the original water-oil volume ratio in each karst cave as
R1＝Vwi1/Voi1(1)
R2＝Vwi2/Voi2(2)
Then:
Vp1＝Voi1+Vwi1(3)
Vp2＝Voi2+Vwi2(4)
Vp1is the initial total volume of the cavern 1, m3；
Vp2Is the initial total volume of the cavern 2, m3；
Injecting a certain amount of water (N) into the reservoirW) When N is presentWIn a range less than NW0Previously, the injected water merely swept the reservoir 1, only if the cumulative water injection rate exceeded NW0I.e., to provide sufficient pressure differential, water is injected to communicate with the second set of reservoir caverns 2. Based on the above assumptions, when the accumulated water injection amount is less than NW0The pressure and the accumulated water injection change of the oil reservoir are the same as those of a single karst cave model, namely:
NW0the accumulated water injection quantity m when water waves are injected to the second set of reservoir bodies in the process of replacing oil by water injection3；
BwIs the volume coefficient, decimal, of water;
Boithe volume coefficient and decimal of the crude oil under the original pressure;
R1the volume ratio of water to oil of the karst cave 1 is small;
Cwis the compressibility factor of formation water, MPa-1；
p0The formation pressure before oil is replaced by water injection is MPa;
Cois the compression factor of crude oil, MPa-1；
N1Is cavern 1 crude oil volume, m3；
When the volume of injected water is more than NW0The method comprises the following steps: differential pressure exceeding the fracture and the second set of reservoir system cavernsAnd at the minimum pressure difference of communication, assuming the communication time of the karst caves 1 and 2, the pressure is redistributed, and the pressure balance is achieved in a short time.
NW0The accumulated water injection quantity m when water waves are injected to the second set of reservoir bodies in the process of replacing oil by water injection3；
R2The volume ratio of water to oil of the karst cave 2 is small;
N2crude oil volume of cavern 2, m3；
Through the change of the slope of the water injection indication curve of a plurality of turns (more than 3 turns) and the oil production and water production data between the water injection turns counted by the production data, the equation can be solved to calculate: volume N of cavernous reservoir 1,21、N2And water-to-oil volume ratio R1And R2。
Apparently communicating the second set of cavern reservoirs, the pressure as a function of the cumulative water injection, the slope of which is determined byBecome intoThe slope becomes smaller and the curve becomes flatter, i.e. a pressure pattern of the broken line occurs.
For the above formula (6), when the elastic energy of water in the cavern is not considered, i.e. the volume coefficient of water is considered to be constant 1, the above formula can be further simplified as follows:
thus, the fill pressure expression can be simplified as a piecewise function as follows:
water filling indication curve form analysis
Taking the two-hole model as an example, when the first cavern reservoir in communication with the well has equal volume and the second cavern reservoir has unequal volume, the effect on the slope of the second segment of the indicator curve is shown in FIG. 1:
when the original conditions of the karst cave 1 are the same, the accumulated injection amount does not exceed the value at the inflection point of the karst cave, the indication curves are the same, and when the accumulated injection amount exceeds Nw0And the larger the reservoir volume of the karst cave 2 is, the larger the elastic energy of the second part of the karst cave is, the more easily the injected water is injected in the second stage, and the more obvious the slope of the straight line is reduced.
When the volumes of the second volumetric reservoirs in communication with the well are equal and the volumes of the first cavern reservoirs are not equal, the effect on the indicative curve morphology is schematically shown in fig. 2, given that the initial conditions of the cavern 2 are the same, when the curves accumulate the injected quantity such that the pressure of the cavern does not exceed pLIn the process, obviously, the larger the reservoir volume of the karst cave 1 is, the larger the elastic energy is, the smaller the linear slope of the first stage is, the same reservoir pressure is increased, and more water needs to be injected, so that N isW01<NW02<NW03. When the accumulated water injection exceeds the corresponding accumulated injection amount at the position of the respective inflection point pressure, the karst caves 1 and 2 simultaneously exert respective elastic energy, so that the slope is reduced, although the properties of the second karst cave are assumed to be the same, the slope of the second-stage karst cave is influenced by the common action of the elastic energy of the karst caves 1 and 2, so that the slope of the second-stage exponential curve is still satisfied to be smaller when the reservoir volume of the karst cave 1 is larger.
The application is applicable to the calculation of the oil-water volume of the reservoir under the following two conditions: the initial conditions in the two sets of karst cave reservoirs are pure oil or oil-water coexistence, wherein the oil-water coexistence comprises the condition that any one or both of the karst cave reservoirs are oil-water coexistence; and the water storage rate in any karst cave reservoir body gradually changes in the later water injection oil replacement process. Therefore, the model can calculate the mutual oil-water supply and exchange condition of the two karst cave reservoirs in the water injection and oil replacement process. The initial conditions of the improved new model are more consistent with the real conditions of the discrete multi-reservoir bodies of the carbonate reservoir, the change of the water storage rate in the oil-replacing process by water injection is closer to the actual conditions of a mine field, the type of the reservoir bodies can be preliminarily judged by utilizing the theoretical model, the volumes of two sets of karst cave reservoir bodies and the volumes of crude oil and formation water can be more accurately determined, and the oil-water exchange condition between the two sets of karst cave reservoir bodies in the multi-round oil-replacing process by water injection is analyzed.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. A carbonate rock oil reservoir double-karst-cave reservoir body water injection indication curve explanation model is characterized in that when an oil reservoir injects a certain water quantity NWThe function model of pressure and accumulated water injection is:
wherein,
N1is cavern 1 crude oil volume, m3；
N2Crude oil volume of cavern 2, m3；
NW0The accumulated water injection quantity m when water waves are injected to the second set of reservoir bodies in the process of replacing oil by water injection3；
BwIs the volume coefficient, decimal, of water;
Boithe volume coefficient and decimal of the crude oil under the original pressure;
R1the volume ratio of water to oil of the karst cave 1 is small;
Cois the compression factor of crude oil, MPa-1；
p0The formation pressure before oil is replaced by water injection is MPa;
Cwis the compressibility factor of formation water, MPa-1
Through the change of the slope of the water injection indication curve of more than 3 times and the oil production and water production data of each water injection time counted by the production data, the equation can be solved to calculate: volume N of cavernous reservoir 1,21、N2And water-to-oil volume ratio R1And R2。
2. The carbonate reservoir double-cavern reservoir waterflood indication curve interpretation model of claim 1,
when the elastic energy of water in the cavern is not considered, namely the volume coefficient of the water is considered to be constant 1, the function model of the pressure and the accumulated water injection quantity is simplified as follows:
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| CN201710019917.XA CN106837273A (en) | 2017-01-11 | 2017-01-11 | The double solution cavity Reservoir Body water injection indication curve interpretation models of Carbonate Reservoir |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108386170A (en) * | 2018-02-01 | 2018-08-10 | 中国石油化工股份有限公司 | Underground energy consumption characterizing method during a kind of oil reservoir development |
| CN108446511A (en) * | 2018-03-28 | 2018-08-24 | 中国石油化工股份有限公司 | The reserve forecasting method of fracture-pore reservoir oil, water |
| CN108756873A (en) * | 2018-06-22 | 2018-11-06 | 中国海洋石油集团有限公司 | A kind of determination method reducing fluid neuron network resistance based on nanotechnology |
| CN109424354A (en) * | 2017-08-29 | 2019-03-05 | 中国石油化工股份有限公司 | The calculation method and system of bottom water reservoir single well-controlled water oil volume ratio |
| CN109697538A (en) * | 2017-10-22 | 2019-04-30 | 哈尔滨石油学院 | Carbonate Reservoir Caves-constant volume physical efficiency amount indicative curve interpretation model |
| CN109944584A (en) * | 2017-12-19 | 2019-06-28 | 中国石油天然气股份有限公司 | Method and device for acquiring reserve of reservoir body in carbonate rock oil well |
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| CN112761602A (en) * | 2021-02-05 | 2021-05-07 | 西南石油大学 | Far well reserve potential excavating method for fracture-cavity oil reservoir |
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