CN114961663A - Sand control method for filling expandable permeable material - Google Patents
Sand control method for filling expandable permeable material Download PDFInfo
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- CN114961663A CN114961663A CN202110188754.4A CN202110188754A CN114961663A CN 114961663 A CN114961663 A CN 114961663A CN 202110188754 A CN202110188754 A CN 202110188754A CN 114961663 A CN114961663 A CN 114961663A
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- 238000000034 method Methods 0.000 title claims abstract description 41
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 125
- 230000006870 function Effects 0.000 claims description 16
- 239000006260 foam Substances 0.000 claims description 13
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 12
- 239000011496 polyurethane foam Substances 0.000 claims description 12
- 229920000431 shape-memory polymer Polymers 0.000 claims description 8
- 239000012781 shape memory material Substances 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000011236 particulate material Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
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Images
Classifications
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- 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
- E21B43/02—Subsoil filtering
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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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a sand control method for filling expandable permeable material. The sand control method comprises the following steps: and filling the porous material with the expansion function into the perforation pore channel and the stratum vacancy zone by adopting sand carrying liquid, and expanding the porous material under the action of stratum temperature or a catalyst to fix the porous material in the perforation pore channel. The expanded porous material resembles a fluid filter and prevents formation sand from entering the wellbore while allowing formation fluid to pass through, thus acting as a sand control. The sand control method adopting the expandable permeable material to fill the perforation duct has the advantages of low measure cost and good comprehensive effect, and meets the requirements of development and production of oil fields.
Description
Technical Field
The invention relates to the technical field of oil extraction, in particular to a sand control method for filling an expandable permeable material.
Background
The sand production of the oil-gas well refers to a process or a phenomenon that in the production process of the oil well or the gas well, due to the fact that the rock structure of a stratum nearby the bottom of the well is changed due to various comprehensive factors such as geological conditions, a production mode and measure operation, scattered sand or dropped sand in the stratum is carried into a shaft or the ground by produced fluid of the stratum, and therefore a series of adverse effects are caused on the normal production of the oil-gas well.
The main approach for solving the problem of sand production of oil and gas wells is to adopt a sand control technology to prevent the sand produced by the stratum from entering a shaft or artificially enhance the consolidation degree of nearby stratum rocks so as to control the sand production of the stratum. The existing sand control technologies mainly include two categories of mechanical sand control and chemical sand control, and specifically can also include screen pipe sand control technology, gravel packing sand control technology, fracturing sand control technology, artificial well wall sand control technology, chemical sand consolidation technology and the like. These sand control techniques are adapted to different downhole conditions, each having advantages and disadvantages.
In order to better solve the problem of sand production of oil wells, in recent years, some novel sand control technologies are provided. Chinese patent (CN102224321A) discloses a shape memory polyurethane foam for downhole sand control filtration devices. The shape memory polyurethane foam is processed into a downhole sand control filter device, which can be maintained at a compression position at a temperature lower than the glass transition temperature of the downhole sand control filter device, and after the downhole sand control filter device is lowered into an oil well, the downhole sand control filter device is expanded from the compression position to an expansion position when heated to a temperature higher than the glass transition temperature of the downhole sand control filter device, and conforms to the structure of a borehole, so that the aim of preventing the sand from being produced from the stratum is fulfilled. Indoor experimental research shows that the shape memory polyurethane foam has expansibility and porous filterability and is an excellent sand control material. Foreign companies utilize the material to process sand-proof filtering devices, and the sand-proof filtering devices are put into field application in 2010. However, in the decade, the sand control filter device is not widely popularized and applied in mines mainly because of the defects which are difficult to overcome. The main problems of the sand control filtering device are that: (1) the dosage of the shape memory polyurethane foam is large, and the processing technology of the sand prevention filtering device is complex, so that the cost of the sand prevention filtering device is very high and is far higher than that of the existing sand prevention technology; (2) in the process of putting the sand control filter device into a shaft, the shape memory polyurethane foam wrapping layer on the outer layer of the sand control filter device is easy to damage due to the friction between the sand control filter device and the shaft wall; (3) once the sand control filtering device fails, the sand control filtering device is difficult to fish out in the well; (4) for an oil well with a perforated completion, the shape memory polyurethane foam of the sand prevention filtering device cannot expand into a stratum void zone and a perforated pore passage, cannot support stratum sand, and causes blockage and scouring damage of the sand prevention filtering device due to the migration of sand grains.
Disclosure of Invention
In order to make up the defects of the prior sand control technology, the invention provides the sand control method for filling the expandable permeable material, which has the advantages of low measure cost and good comprehensive effect and meets the requirements of development and production of oil fields.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a sand control method for filling expandable permeable material, which comprises the following steps: and filling the porous material with the expansion function into the perforation pore channel and the stratum vacancy zone by adopting sand carrying liquid, and expanding the porous material under the action of stratum temperature or a catalyst to fix the porous material in the perforation pore channel. The expanded porous material resembles a fluid filter that prevents formation sand from entering the wellbore while allowing formation fluids to pass through.
According to the sand control method, the size of the porous material before expansion is preferably smaller than that of the perforation duct, and the size after expansion is larger than that of the perforation duct, so that the porous material can conform to the structure of the perforation duct and is fixed in the perforation duct after expansion.
According to the sand control method of the present invention, preferably, the porous material having an expansion function has a completely open cell structure with a cell size of 0.05mm to 0.50 mm.
The size of the hole of the porous material with the expansion function is equal to the sand blocking precision, and the porous material is designed according to the formation sand granularity parameter.
According to the sand control method, preferably, the porous material with the expansion function is a shape memory material or a composite body of the shape memory material and other materials.
According to the sand control method of the present invention, preferably, the shape memory material includes a shape memory polymer foam, a porous shape memory alloy, or a shape memory polymer and foam metal composite.
According to the sand control method of the present invention, preferably, the shape memory polymer foam includes shape memory polyurethane foam or shape memory epoxy resin foam, etc.;
the other materials include fibrous and particulate materials as filler materials for shape memory polymers; the particulate material comprises one or a combination of two or more of calcium carbonate, silica and alumina.
According to the sand control method, the porous material with the expansion function is preferably spherical, namely, the porous material is a porous ball, and can be in other shapes as long as the porous material can enter a stratum depletion zone and a perforation pore passage through perforation holes.
According to the sand control method of the present invention, preferably, the compressive strength of the expanded porous ball is greater than 2 MPa. Namely, the expanded porous ball can not be seriously deformed under the production pressure difference of more than 2MPa, so that the sand prevention effect is not influenced.
According to the sand control method, the deformation temperature required for the expansion of the porous material with the expansion function is preferably lower than the formation temperature; otherwise, after the porous material is injected, injecting hot fluid (such as hot water) with the temperature higher than the deformation temperature of the porous material; so that the porous material expands under the temperature of the hot fluid and is fixed in the perforation duct.
According to the sand control method of the present invention, it is preferable that each perforation tunnel is filled with at least one porous material, and at least one of the porous materials is located in a cement sheath or casing section.
According to the sand control method of the present invention, preferably, the outer surface of the porous material having an expansion function is coated with a polyvinyl alcohol film.
Compared with the prior sand control technology, the sand control method has the following beneficial effects:
(1) the sand control method has simple construction, does not need to put a screen pipe, does not need to fill resin sand, saves construction procedures and sand control materials, and can greatly reduce the cost of sand control measures.
(2) Through the shape restoring force or the elastic restoring force of the porous material, the rock wall surface of the perforation duct is supported, and the structural damage and the sand migration of a rock framework are prevented; the sand control effect is good, the blockage is not easy to occur, and the influence on the oil well yield is small.
(3) The shaft does not leave a pipe column, so that the production test and the later-stage well repairing operation are facilitated.
(4) After the sand control is invalid, special treatment is not needed, and the pitching sand control operation can be repeated.
Drawings
Figure 1 is a schematic representation of an expanded porous ball provided in example 1 before expansion in a perforation tunnel.
Figure 2 is a schematic representation of the expanded porous ball provided in example 1 after expansion in a perforation tunnel.
FIG. 3 is a comparison of the size of the expanded porous balloon of the example before and after expansion.
FIG. 4 is a schematic view of an experimental apparatus for sand control effect of the expanded porous ball in embodiment 3.
Description of reference numerals:
1-expansion porous ball, 2-perforation pore canal, 31-casing, 32-cement sheath, 33-stratum;
42-sand filling pipe, 43-formation sand.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
The present embodiment provides a sand control method for filling perforation tunnels, wherein the porous material with expansion function used is spherical, which is called as expanded porous ball.
Firstly, an oil pipe is put in, and after the pad fluid is squeezed and injected, the sand carrying fluid is injected, and the expanded porous ball is mixed in the sand carrying fluid. Filling the expanded porous ball 1 into a perforation tunnel 2 by using the sand-carrying fluid, as shown in figure 1; under the action of formation temperature or catalyst, the expanded porous ball 1 is expanded and fixed in the perforation tunnel 2, as shown in figure 2. The expanded porous ball is similar to a fluid filter, can prevent formation sand from entering a shaft, and simultaneously allows formation fluid to pass through, so that the function of sand prevention is achieved.
In order to ensure the sand control effect, the ball throwing operation needs to ensure that at least one expanded porous ball 1 is filled in each perforation tunnel 2, and at least one expanded porous ball is positioned in a cement sheath 32 or a casing segment 31, as shown in fig. 1 and 2, wherein 33 is a stratum.
The expansion porous ball adopts shape memory polyurethane foam, which is a foam structure material with a shape memory function, and realizes the expansion function of the porous ball by utilizing the shape recovery characteristic of the foam structure material. Injecting the shape memory polyurethane into a foaming device to foam the material in a closed mould, and curing to obtain the original shape memory foam. After the original state shape memory foam is softened by thermal stimulation, constant pressure is applied to the original state shape memory foam to enable the original state shape memory foam to deform by more than 20%, and the shape of the original state shape memory foam is fixed along with the reduction of temperature to obtain the deformed state shape memory foam. Finally, the deformed shape memory foam was processed into a spherical structure to obtain the expanded porous ball used in this example. After entering the perforation pore canal, the expanded porous ball expands and restores to original shape memory foam under the stimulation of formation temperature or catalyst.
The deformation temperature of the selected shape memory polyurethane foam is 40-95 ℃. The formation temperature is greater than the deformation temperature of the shape memory polymer foam porous spheres. If the formation temperature does not reach the deformation temperature of the porous spheres, hot water may be injected, or a catalyst that will shape-recover the porous spheres may be injected.
The size of the expanded porous ball before expansion is smaller than that of the perforation pore passage, the size after expansion is larger than that of the perforation pore passage, and the expanded porous ball can be fixed in the perforation pore passage. Specifically, for an 51/2' wellbore, the perforation tunnel size is generally 8mm to 10mm, the size of the expanded porous ball before expansion is 6mm to 7mm, and the size of the expanded porous ball after expansion is larger than 12mm without restriction, and the expanded porous ball before and after expansion is shown in FIG. 3. Due to the constraint action of the perforation pore passage and the roughness of the rock wall surface, the expanded porous ball can conform to the structure of the blasthole and is firmly clamped into the blasthole, and meanwhile, the expanded porous ball can bear a certain production pressure difference and cannot be spit back in the oil-gas production process.
The shape memory polyurethane foam is selected as the foam with an open-cell structure, the size of a foaming cell is 0.05mm-0.50mm, and the size of the cell is equal to the sand blocking precision. The sand blocking precision of the porous ball is designed according to the median of the formation sand granularity, namely the sand blocking precision of the porous ball is equal to the median d50 of the formation sand granularity.
The sand control principle of the expanded porous ball comprises two aspects: on one hand, the shape restoring force of the expanded porous ball supports the rock wall surface of the perforation duct, so that structural damage of the rock and sand migration of a rock framework are prevented; on the other hand, sand grains stripped from the rock framework form a stable sand bridge on the surface of the expanded porous ball, and filtration and sand prevention are carried out by utilizing the holes of the expanded porous ball.
The compressive strength of the expanded porous ball is greater than 2MPa, namely, the expanded porous ball can not be seriously deformed under the production pressure difference of more than 2MPa, and the sand prevention effect is influenced. The expanded porous ball has good temperature resistance, namely, the strength of the expanded porous ball does not change at the formation temperature, and the expanded porous ball can keep the temperature for a long time. The density of the expanded porous ball is similar to that of the sand carrying fluid, so that the sand carrying fluid is favorably carried and filled.
To avoid swelling of the swelling porous ball before it enters the perforation tunnel, a delayed swelling method may be considered. For example, a polyvinyl alcohol (PVA) film is used to wrap or cover the outer surface of the expanded porous spheres to prevent premature expansion. Once the expanded porous spheres have entered the perforation tunnels and are at formation temperature for a period of time, the PVA film is able to dissolve in the well fluid, after which the expanded porous spheres expand to conform to the structure of the blasthole and become fixed in the blasthole.
Example 2
The embodiment provides a sand control process for filling a perforation tunnel, which comprises the following steps:
the oil pipe is put into the bottom of an oil layer and is separated from the bottom of the artificial well by about 0.5m to 1.0 m; clear water or KCl salt water or guanidine gum liquid within 50mPa & s is adopted as sand carrying liquid; putting the expanded porous balls with the number larger than that of the perforation pore canals into the sand carrying liquid at a well head, carrying the sand carrying liquid to the well bottom, and filling the sand carrying liquid into the perforation pore canals; when the ground pumping pressure is obviously increased, indicating that the perforation pore channel is filled with the expanded porous ball, stopping construction, closing the well for a certain time, and expanding the expanded porous ball; and (4) pulling out the oil pipe, putting down the production string and putting into production.
The construction process adopts bottom filling of the oil layer, and can prevent the expansion porous ball from sinking into the bottom of the well and ensure the filling effect relative to top filling of the oil layer.
Example 3
This embodiment is to the porous ball sand control effect of inflation experiment verification:
the shape memory polyurethane foam material is processed into the expanded porous ball, the diameter of the sand control ball is 8mm, and the density is 1.05g/cm 3 The volume expansion rate can be up to 4 times, as shown in fig. 3.
As shown in FIG. 4, the expanded porous ball 1 is placed in a sand pack pipe 42, and the diameter of the lower end of the sand pack pipe 1 is 6mm and the diameter of the upper part thereof is 12 mm. And putting the sand filling pipe filled with the expanded porous ball into a water bath at 60 ℃ to expand the sand control ball. Then 20g of stratum sand 43 with the grain diameter of 0.10mm-0.35mm is added on the expanded porous ball in the sand filling pipe 42, a water source is connected, and a sand prevention experiment is carried out by clear water, namely the clear water is used for flushing the sand filling pipe from top to bottom. The sand is continuously flushed by clean water for 60min, and the sand output is only 0.032g, which shows that the expanded porous ball has good sand blocking effect.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (11)
1. A sand control method of packing an expandable permeable material, the sand control method comprising: and filling the porous material with the expansion function into the perforation pore channel and the stratum vacancy zone by adopting the sand carrying liquid, expanding the porous material under the action of the stratum temperature or a catalyst, and fixing the expanded porous material in the perforation pore channel.
2. The sand control method as claimed in claim 1, wherein the size of the porous material before expansion is smaller than the size of the perforation tunnel, and the size after expansion is larger than the size of the perforation tunnel, and the porous material after expansion can conform to the structure of the perforation tunnel and be fixed in the perforation tunnel.
3. The sand control method as claimed in claim 1, wherein the porous material having an expansion function has a completely open cell structure with a cell size of 0.05mm to 0.50 mm.
4. The sand control method according to claim 1, wherein the porous material with the expansion function is a shape memory material or a composite of the shape memory material and other materials.
5. The sand control method of claim 4 wherein the shape memory material comprises a shape memory polymer foam, a porous shape memory alloy, or a shape memory polymer and foam metal composite.
6. The sand control method of claim 5 wherein the shape memory polymer foam comprises a shape memory polyurethane foam or a shape memory epoxy foam;
the other materials include fibers and particulate materials including one or a combination of two or more of calcium carbonate, silica and alumina.
7. The sand control method as claimed in claim 1, wherein the porous material having an expansion function has a spherical shape.
8. The sand control method of claim 1 wherein the expanded porous spheres have a compressive strength greater than 2 MPa.
9. The sand control method as claimed in claim 1, wherein the deformation temperature required for the expansion of the porous material having the expansion function is lower than the formation temperature; otherwise, injecting hot fluid with the temperature higher than the deformation temperature of the porous material after injecting the porous material.
10. The sand control method of claim 1 wherein each perforation tunnel is filled with at least one porous material and wherein at least one porous material is located in a cement sheath or casing section.
11. The sand control method as claimed in claim 1, wherein the outer surface of the porous material having an expansion function is coated with a polyvinyl alcohol film.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558480A (en) * | 2022-11-07 | 2023-01-03 | 东营月恒化工有限公司 | Sand-proof coating sand and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115558480A (en) * | 2022-11-07 | 2023-01-03 | 东营月恒化工有限公司 | Sand-proof coating sand and preparation method thereof |
| CN115558480B (en) * | 2022-11-07 | 2024-01-19 | 东营月恒化工有限公司 | Sand-proof coated sand and preparation method thereof |
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| CN114961663B (en) | 2024-06-25 |
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