CN114109315A - Oil exploitation method for improving injection and exploitation capacity of reservoir - Google Patents
Oil exploitation method for improving injection and exploitation capacity of reservoir Download PDFInfo
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- CN114109315A CN114109315A CN202111466954.8A CN202111466954A CN114109315A CN 114109315 A CN114109315 A CN 114109315A CN 202111466954 A CN202111466954 A CN 202111466954A CN 114109315 A CN114109315 A CN 114109315A
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- 238000002347 injection Methods 0.000 title claims abstract description 54
- 239000007924 injection Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 149
- 238000004519 manufacturing process Methods 0.000 claims abstract description 64
- 238000005065 mining Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims description 17
- 239000003208 petroleum Substances 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 11
- 238000005429 filling process Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 239000003129 oil well Substances 0.000 abstract description 18
- 239000012535 impurity Substances 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 7
- 239000000945 filler Substances 0.000 abstract 1
- 230000002265 prevention Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- 238000012856 packing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 208000001491 myopia Diseases 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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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- 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
- E21B43/08—Screens or liners
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides an oil exploitation method for improving the injection and production capacity of a reservoir, which comprises the following steps: s1: sand selection, S2: filler injection, S3: primary mining, S4: sand discharge, S5: and (5) secondary mining. The invention adopts the filling sand body with specific density and granularity to fill the gap between the sleeve and the sieve tube of the target stratum, thereby forming a gravel filling layer, the gravel filling layer can prevent solid impurities in the target stratum from entering the sieve tube, can prevent the sand production phenomenon of the target stratum, and prevent the sand production of the production layer from plugging the sieve tube, thereby prolonging the production life of the oil well and improving the production quantity of the whole life cycle of the oil well.
Description
Technical Field
The invention relates to the technical field of oil drilling and production engineering, in particular to an oil production method for improving the injection and production capacity of a reservoir stratum.
Background
In the frequent injection and production process of a reservoir, an injection and production well can cause reservoir blockage due to reservoir sand production and particle migration, the major problems of oil well sand production (solid impurities/particles are carried into the injection and production well in the oil infiltration process) can cause serious abrasion of underground equipment and ground equipment, even possibly cause sand blocking, and in addition, the workload of ground clearing and sand washing pump detection can be greatly increased. On one hand, the injection and production well is required to pay attention to guarantee the oil layer exploitation condition of the oil well, the selection of well completion and well cementation modes is correctly carried out, a reasonable injection and production mode is formulated, a reasonable production pressure difference is controlled, and the seepage velocity is limited; on the other hand, corresponding sand prevention measures are also needed to be adopted according to the related mining processes and the characteristics of oil reservoirs, so that the normal mining of the oil well and the safety of the oil well are further guaranteed.
The sand control mode that is commonly used at present is two kinds of modes of chemical agent sand control and gravel packing sand control, but they also have a lot of problems: firstly, because the chemical sand consolidation agent is generally an oil-soluble resin chemical product, the water resistance of the resin is poor, the consolidation strength is low in a water phase, sand control and stabilization can only slow down formation sand production in an anhydrous oil extraction period or a low water-containing period with low scouring strength, and the formation sand production cannot be slowed down in a high water-containing period; secondly, the chemical agent has high viscosity, and is diluted by an organic solvent and then injected into a stratum in the actual use process, so that the organic solvent can bring the problems of safety, environmental protection and the like; thirdly, because the chemical sand consolidation agent and the curing agent are in contact reaction fast and are difficult to be uniformly mixed in the stratum, multi-section plugs are required to be separately injected during site construction, the construction period is long, and simultaneously, the strength of the consolidated sand body is not high and the sand consolidation effect is not good; fourthly, although the gravel filling well completion mode can protect the reservoir from being damaged by cement slurry and effectively prevent the formation sand from moving, the gravel filling well completion method has the advantages of good sand control effect, long service life and the like, but the gravel filling process has certain defects: in the long horizontal well section, due to the fact that gravel is settled and stacked in the filling process, a filling opening is prone to being blocked, so that the filling between a screen pipe and a well wall is not compact, high-efficiency filling cannot be achieved, and finally sand prevention failure is caused; when the semi-submersible platform is used, the semi-submersible platform is influenced by heave, and during gravel packing operation, a packing tool can move and be dislocated, so that sealing failure is caused, or a packing hole is dislocated, so that the gravel packing operation fails. The gravel packing sand control operation is also complex in use process, and the post treatment is complex and high in cost when a sand control pipe column is arranged in the well.
Therefore, it is necessary to invent an oil exploitation method which can overcome the above disadvantages, has a sand prevention function, improves the injection and production capacity of an oil well, prolongs the exploitation life of the oil well, and improves the exploitation yield of the whole life cycle of the oil well.
Disclosure of Invention
In view of the above, in order to solve the defects of the existing sand prevention technology, improve the sand prevention success rate, prolong the exploitation life of an oil well and improve the exploitation amount of the whole life cycle of the oil well, the invention provides an oil exploitation method for improving the injection and extraction capacity of a reservoir, and the exploitation method improves the yield of an oil injection and extraction well system; the petroleum injection and production well system comprises an injection and production well, a casing pipe extending to the bottom of the well along the well wall, and a sieve pipe coaxially arranged in the casing pipe; the method comprises the following steps:
s1: selecting sand bodies: selecting two sand bodies with different densities as filling sand bodies;
s2: filling sand bodies: filling two filling sand bodies with different densities into a gap between an inner sleeve of the injection-production well and the sieve tube in a layered manner, wherein the height of the filling sand bodies exceeds the upper end of the sieve tube, and the filling sand body with the higher density in the two filling sand bodies is positioned at the lower layer; after the filling of the filled sand body is finished, a plugging device is placed in a gap between the sleeve and the sieve tube, and the plugging device plugs the upper end of the filled sand body;
s3: primary mining: installing an oil pump in the injection and production well, wherein the lower end of the oil pump extends into the sieve tube, and the oil pump extracts oil in the injection and production well until the flow of the oil extracted by the oil pump is lower than a certain value, so that primary oil production is completed;
s4: and (3) sand body discharge: taking out the plugging device, injecting well killing fluid into the injection and production well, and displacing all the filled sand bodies in the screen pipe by the well killing fluid through buoyancy so as to reduce the petroleum permeation resistance of the target stratum;
s5: secondary mining: and (3) reducing the flow resistance of the petroleum in the target stratum, increasing the flow of the petroleum, starting the pumping unit again, and performing secondary exploitation on the petroleum in the injection and production well.
Further, the two types of sand filling bodies selected in step S1 are a first sand filling body and a second sand filling body, respectively, and the density of the second sand filling body is 1.05g/cm3The density of the first sand filling body is 1.01g/cm3The two kinds of filling sand bodies do not react with water and oil, the sphericity is greater than 0.9, the particles are not broken under the pressure of 60MPa, and the flattening rate is lower than 3%.
Further, the second sand filling body is filled into the cavity from the bottom of the sleeve to the position 3m below the bottom of the screen pipe.
Further, the first sand filling body is filled into a cavity between the plugging device and the position 3m below the bottom of the screen pipe.
Further, the filling volume of the first filling sand body is V1The filling volume of the second filling sand body is V2，V1＝H×π×[R2 Sleeve－(RSieve+D)2]
V2＝H’πR2 Sleeve
In the above formula: h, the distance between the bottom of the sieve tube and the plugging device;
Rsleeve: the inner diameter radius of the sleeve;
Rsieve: the inner diameter radius of the sieve tube;
h': the height from the bottom of the sleeve to the position 3m below the bottom of the sieve tube
D: the wall thickness of the screen.
Further, the radius of the particles of the first sand pack is R,
is the median particle size, R and
satisfies the following relation:
further, in S2, the second sand filling process is: a second sand body is put into the gap between the race pipe and the sleeve pipe, and the using density is 1.025g/cm3The second sand body is flushed to the bottom of the sleeve by the sand-carrying liquid.
Further, in S2, the first sand filling process is: the first sand body is put into the gap between the race pipe and the sleeve pipe, and the using density is 1.01g/cm3The sand carrying liquid washes the first sand body to a designated position.
Further, the density of the well killing fluid of the fluid is 1.08-1.12 g/cm.
The oil exploitation method for improving the injection and production capacity of the reservoir has the beneficial effects that: the method adopts the filling sand body with specific density and granularity to fill the gap between the sleeve and the sieve tube of the target stratum, thereby forming the gravel filling layer, and the solid particle impurities in the diameter of the filling sand body particles of the gravel filling layer in the target stratum are fully blocked by the gravel filling layer, thereby preventing the solid impurities in the target stratum from entering the sieve tube, preventing the sand production phenomenon of the target stratum, preventing the sand production of the production layer from plugging the sieve tube, prolonging the production life of the oil well and improving the production quantity of the oil well in the whole life cycle.
Drawings
FIG. 1 is a diagram illustrating the effect of an oil extraction method for improving the injection and production capacity of a reservoir according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of oil recovery to improve the injection and recovery capacity of a reservoir in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of an arrangement of square patterns of first sand-packed bodies;
FIG. 4 is a schematic view of a triangular pattern arrangement of first sand-packed bodies.
In the above figures: 1-injection and production well, 2-casing, 3-screen pipe, 4-target stratum, 5-plugging device and 6-sand filling body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Please refer to fig. 1 and fig. 2: the oil exploitation method for improving the injection and production capacity of the reservoir is used for improving the yield of an oil injection and production well system; the petroleum injection well system comprises an injection well 1, a casing 2 extending to the bottom of a well along the wall of the well, and a sieve tube 3 coaxially arranged in the casing, wherein the casing 2 extends to the bottom of the well, the bottoms of the casing 2 and the sieve tube 3 are both closed, the sieve tube 3 penetrates through a target stratum 4 (the target stratum 4 is a petroleum storage layer), an overflow hole is formed in the wall of the casing 2, and a plug hole is formed in the wall of the sieve tube 3.
Referring to fig. 1 and 2, the method for improving the injection and production capacity of the reservoir according to the present invention comprises the following steps:
s1: selecting sand bodies: selecting two sand bodies with the same density as the filling sand body 6;
the two types of filling sand bodies are respectively a first filling sand body and a second filling sand body, wherein the density of the first filling sand body is 1.01g/cm3The density of the second sand pack is 1.05g/cm3The two filling sand bodies do not react with water and oil, the sphericity of the particles is more than 0.9, the particles are not broken under the pressure of 60MPa, and the flattening rate is lower than 3 percent;
s2: filling sand bodies: filling two filling sand bodies with different densities into a gap between an inner sleeve and a screen pipe of the injection and production well in a layered mode, wherein the second filling sand body is filled in the lower layer, the first filling sand body is filled in the upper layer, the upper end of the first filling sand body is higher than the upper end of a target stratum 4, and the lower end of the first filling sand body is lower than the lower end of the screen pipe 3, so that the first filling sand body plays a sand prevention role, solid impurities in the target stratum 4 are prevented from flowing into the screen pipe 3 to block the screen pipe, after the sand bodies are filled, a plugging device 5 is placed into the gap between the sleeve 2 and the screen pipe 3, and the plugging device 5 plugs the upper end of the filling sand body.
For the first sand filling body to fully play a sand prevention effect, the granularity of the first sand body is R, and then R satisfies the requirement
Wherein
The median particle size of the solid impurities in the formation of interest,
obtained from the actual sampling, the above equation is obtained by the following procedure:
referring to fig. 3 and 4, the sand bodies in the first sand filling bodies are all near-sighted spheres, the sand parts in the first sand filling bodies have gaps, the inner truncated sphere in the gap is a pore throat, in order to enable the first sand filling bodies to play a sand prevention effect, the diameter of the pore throat is smaller than solid impurity particles in a target stratum, the size of the pore throat is the smallest when the particles of the first sand filling bodies are arranged in a triangular model, the size of the pore throat is the largest when the particles of the first sand filling bodies are arranged in a square model, and when the particles of the first sand filling bodies are arranged in a triangular model, the size of the pore throat is the largest
When the grains of the first sand-packed body are arranged in a triangular pattern, the pore throats
The estimated pore throat size is therefore HD3＝βHD1+(1-β)HD2Where β is the estimation coefficient, in the present embodiment, β is 0.5, at this time
In order to ensure the sand control effect of the first sand pack body, it is necessary to satisfy R
Referring to fig. 1 and 2, in step S2, the filling process of the first sand pack and the second sand pack includes: firstly, filling a second sand filling body into a gap between the sleeve 2 and the sieve tube 3; the density of the gas is 1.025g/cm3The second well-filling fluid flushes the second sand filling body into the bottom of the sleeve; then a first sand pack is filled into the gap between the casing 2 and the screen 3The density of the mixture is introduced into the reactor and is 1.05g/cm3The first filling sand body is flushed into the second filling upper layer sand body by the first well injection liquid.
In order to ensure the sand control effect, the upper end of the first sand filling body exceeds the upper end of the target stratum, and the lower end of the first sand filling body exceeds the lower end of the target stratum, in the embodiment, the filling volumes of the first sand filling body and the second sand filling body are respectively V1 and V2;
V1＝H×π×[R2 sleeve－(RSieve+D)2]；
V2＝H’πR2 Sleeve；
In the above formula: h, the distance between the bottom of the sieve tube and the plugging device;
Rsleeve: the inner diameter radius of the sleeve;
Rsieve: the inner diameter radius of the sieve tube;
h': the height from the bottom of the sleeve to the position 3m below the bottom of the sieve tube;
d: the wall thickness of the screen.
Therefore, the first sand filling body can be filled into a cavity which can be filled from the plugging device 5 to the position 3m below the bottom of the screen pipe 3, the second sand filling body is filled into a cavity which is arranged from the bottom of the sleeve pipe 2 to the position 3m below the bottom of the screen pipe 3, the second sand filling body plays a supporting role on the first sand filling body, and the plugging device 5 can prevent the first sand filling body from moving upwards.
S3: primary mining: installing an oil well pump at the upper end of a well mouth of the injection and production well 1, extending the lower end of the oil well pump into the sieve tube 3, starting the oil well pump, extracting the oil penetrating into the sieve tube 3, gradually reducing the oil flow penetrating into the sieve tube 3 after the initial production lasts for a period of time, closing the oil well pump after the oil flow extracted by the oil well pump is reduced to a certain value, and stopping oil pumping;
s4: and (3) sand body discharge: taking out the plugging device 5, continuously injecting high-pressure killing fluid into the injection and production well to circulate the killing fluid in the injection and production well 1, wherein the density of the killing fluid is 1.08-1.12g/cm, and displacing the sand bodies of the first filling sand body and the second filling sand body which are positioned in the target stratum 4 by buoyancy in the circulation process of the killing fluid 1 in the injection and production well 1, so that the sand bodies filled in the step S3 are discharged from the injection and production well;
s5: secondary mining: after the sand body in the target stratum 4 is discharged, the flow resistance of the petroleum in the target stratum 4 is reduced, the petroleum permeation flow is increased, the pumping unit is started again, and secondary exploitation is carried out on the petroleum in the injection and production well 1.
By adopting the mining method, the problem that the sand is produced in the target stratum 4 in the petroleum infiltration process can be prevented, the mining period of the injection and production well 1 can be effectively maintained, and the full life cycle mining amount of the injection and production well 1 is improved.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. An oil exploitation method for improving the injection and production capacity of a reservoir is characterized in that: the exploitation method is used for improving the yield of the petroleum injection and production well system; the petroleum injection well system comprises an injection well, a casing pipe extending to the bottom of the well along the well wall, and a sieve pipe coaxially arranged in the casing pipe, wherein the sieve pipe penetrates through a target stratum; the method comprises the following steps:
s1: selecting sand bodies: selecting two sand bodies with different densities as filling sand bodies;
s2: filling sand bodies: filling two filling sand bodies with different densities into a gap between an inner sleeve of the injection-production well and the sieve tube in a layered manner, wherein the height of the filling sand bodies exceeds the upper end of the sieve tube, and the filling sand body with the higher density in the two filling sand bodies is positioned at the lower layer; after the filling of the filled sand body is finished, a plugging device is placed in a gap between the sleeve and the sieve tube, and the plugging device plugs the upper end of the filled sand body;
s3: primary mining: installing an oil pump in the injection and production well, wherein the lower end of the oil pump extends into the sieve tube, and the oil pump extracts oil in the injection and production well until the flow of the oil extracted by the oil pump is lower than a certain value, so that primary oil production is completed;
s4: and (3) sand body discharge: taking out the plugging device, injecting well killing fluid into the injection and production well, and displacing all the filled sand bodies in the screen pipe by the well killing fluid through buoyancy so as to reduce the petroleum permeation resistance of the target stratum;
s5: secondary mining: and (3) reducing the flow resistance of the petroleum in the target stratum, increasing the flow of the petroleum, starting the pumping unit again, and performing secondary exploitation on the petroleum in the injection and production well.
2. An oil recovery method for improving the injection and production capacity of a reservoir according to claim 1, characterized in that: the two types of filled sand bodies selected in the step S1 are respectively a first filled sand body and a second filled sand body, and the density of the second filled sand body is 1.05g/cm3The density of the first sand filling body is 1.01g/cm3The two kinds of filling sand bodies do not react with water and oil, the sphericity is greater than 0.9, the particles are not broken under the pressure of 60MPa, and the flattening rate is lower than 3%.
3. An oil recovery method for improving the injection and production capacity of a reservoir according to claim 2, characterized in that: and the second filling sand body is filled into the cavity from the bottom of the sleeve to the position 3m below the bottom of the screen pipe.
4. An oil recovery method for improving the injection and production capacity of a reservoir according to claim 2, characterized in that: and filling the first filling sand body into a cavity between the plugging device and the position 3m below the bottom of the screen pipe.
5. An oil recovery method for improving the injection and production capacity of a reservoir according to claim 2, characterized in that: the filling volume of the first filling sand body is V1The filling volume of the second filling sand body is V2，
V1＝H×π×[R2 Sleeve－(RSieve+D)2]
V2＝H’πR2 Sleeve
In the above formula: h, the distance between the bottom of the sieve tube and the plugging device;
Rsleeve: the inner diameter radius of the sleeve;
Rsieve: the inner diameter radius of the sieve tube;
h': the height from the bottom of the sleeve to the position 3m below the bottom of the sieve tube
D: the wall thickness of the screen.
6. A method of oil recovery for enhancing the injection and recovery capacity of a reservoir as defined in claim 3, wherein: the radius of the particles of the first sand pack is R,
is the median particle size, R and
satisfies the following relation:
7. an oil recovery method for improving the injection and production capacity of a reservoir according to claim 2, characterized in that: in S2, the second sand filling process is: a second sand body is put into the gap between the race pipe and the sleeve pipe, and the using density is 1.025g/cm3The second sand body is flushed to the bottom of the sleeve by the sand-carrying liquid.
8. An oil recovery method for improving the injection and production capacity of a reservoir according to claim 2, characterized in that: in S2, the first sand filling process is: the first sand body is put into the gap between the race pipe and the sleeve pipe, and the using density is 1.01g/cm3The sand carrying liquid washes the first sand body to a designated position.
9. An oil recovery method for improving the injection and production capacity of a reservoir according to claim 1, characterized in that: the density of the well killing fluid is 1.08-1.12 g/cm.
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