CN108361008B - Method for increasing yield of inclined fault block oil reservoir by injecting gas at different development stages - Google Patents
Method for increasing yield of inclined fault block oil reservoir by injecting gas at different development stages Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000001965 increasing effect Effects 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 102
- 238000002347 injection Methods 0.000 claims abstract description 95
- 239000007924 injection Substances 0.000 claims abstract description 95
- 230000005465 channeling Effects 0.000 claims abstract description 25
- 239000006260 foam Substances 0.000 claims abstract description 24
- 239000004088 foaming agent Substances 0.000 claims abstract description 23
- 239000000243 solution Substances 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 230000000638 stimulation Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 230000005484 gravity Effects 0.000 abstract description 5
- 230000004069 differentiation Effects 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 140
- 239000003921 oil Substances 0.000 description 102
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 239000010779 crude oil Substances 0.000 description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 238000004088 simulation Methods 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 239000007788 liquid Substances 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000005406 washing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 1
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- 238000005065 mining Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000002791 soaking 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to a method for increasing yield of an inclined fault block oil reservoir by injecting gas at different development stages, which comprises three stages, namely: injecting gas to a high part of a broken block oil reservoir structure to drive residual oil on the top, and producing by a low part production well, but because the gas channeling is serious, the production well rapidly produces a large amount of gas, and the oil production amount is little or even no longer oil; and a second stage: closing the production well, continuing gas injection and pressurization, closing the gas injection well for standing when the pressure is increased to a certain pressure, re-transferring oil gas due to the action of gravity differentiation, filling a gas channeling channel, forming a gas cap with a certain scale, then opening the well for production, and obtaining a better yield increase effect by re-distributing the gas channeling channel and combining the expansion energy of the gas cap, wherein the gas injecting well and the production well are periodically and alternately switched on and off until the development effect of the production well is worsened; and a third stage: gas and foaming agent solution are injected from the gas injection well at the same time, foam is formed and then injected into the oil reservoir, and the foam can well block a gas channeling channel, so that the development effect is improved.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a method for increasing the yield of an inclined fault block oil reservoir by injecting gas at different development stages.
Background
In the later period of high water content, the 'attic oil' at the high part of the structure is difficult to be developed economically and effectively, and the top gas injection mode can achieve better yield increasing effect. The top gas injection drive development is adopted, in the gas injection process, the gravity differentiation effect is generated by utilizing the characteristic of large oil-gas density difference, and attic oil which cannot reach the top of an oil reservoir after the water drive stage is finished can be gathered again, so that the oil reservoir sweep coefficient is improved, and the secondary gas cap has gas expansion energy and pushes an oil-gas interface to move towards the lower part of a structure more uniformly, so that crude oil is pushed to enter a production well to be extracted. And the top gas injection and flooding mechanism also comprises the step of dissolving gas in crude oil during gas injection, so that the viscosity of the crude oil is reduced, the displacement resistance can be reduced in the oil displacement process, the flowing condition is improved, the oil washing efficiency is improved, and the oil reservoir recovery rate can be further improved. In the top gas injection and flooding process, gas can enter a high-inclination part of a fault block oil reservoir where water cannot enter, the crude oil in a bound state is displaced into flowable crude oil, and the gas has good compressibility and expansibility, so that the gas has good effects of blocking removal, drainage assistance, displacement, gas lift and the like when energy is released.
Although the top gas injection mode has obvious advantages in developing 'attic oil', the gas channeling phenomenon is serious because of large difference of oil-gas fluidity in the continuous gas injection process, and the oil production of the production well is sharply reduced or even no oil is produced any more. Therefore, how to effectively develop the attic oil distributed in the high part of the inclined fault block oil reservoir is a great problem at present.
Chinese patent document CN106968651A discloses a nitrogen and carbon dioxide composite huff and puff oil production method, which comprises the following steps: lowering the injection-production integrated pipe column to a target oil layer in the oil well; the top of the injection-production integrated pipe column is connected with a gas injection device and a thin oil injection device on the ground, and the gas injection device comprises a nitrogen injection device and a carbon dioxide injection device; the gas injection device injects gas into the oil well through the injection-production integrated pipe column; nitrogen, carbon dioxide and thin oil are injected and then well stewing is carried out; after the well head pressure after the well soaking is stable, controlling open flow through an oil nozzle; and starting pumping by the injection-production integrated pipe column after the pressure of the well mouth and the liquid amount of the blowout well are both smaller than the preset values. The nitrogen and the carbon dioxide are jointly used as a primary injection medium, the nitrogen realizes the function of replacing attic oil at the high part around the well, the carbon dioxide realizes the functions of dissolving, viscosity reduction and expansion energization of the thick oil in the stratum, and the recovery ratio of the ultra-deep crack-hole type thick oil reservoir is improved by utilizing the dual compound action of the gas cap energization of the nitrogen and the carbon dioxide stratum viscosity reduction. However, the influence of gas channeling on subsequent oil recovery is not considered in the production mode, and after the gas channeling occurs, gas of a production well breaks through prematurely, so that the oil yield is greatly reduced.
The invention content is as follows:
aiming at the problem that 'attic oil' distributed at the high part of the inclined fault block oil reservoir at the present stage is difficult to develop effectively, the invention provides a method for increasing the yield of the inclined fault block oil reservoir by injecting gas at different development stages.
Summary of the invention:
the method of the invention injects gas to the high part of the broken block oil reservoir structure to drive the attic oil, firstly, continuous gas injection is carried out, the production well at the low part produces the oil, the serious gas channeling can happen quickly after the gas channeling channel is produced, and the oil production amount of the production well is very little or even no longer produces the oil. And after the production well is degraded, the gas injection well and the production well are alternately opened to perform periodic alternate gas injection production. And finally, injecting corresponding gas foam from the gas injection well for displacement, producing crude oil from the production well in a foam oil form, increasing the production pressure difference, having a good blocking effect on a gas channeling channel and an obvious yield increasing effect.
The noun explains:
"attic oil": when the inclined fault block oil reservoir enters a high water-content oil extraction stage, the residual oil is distributed scattered and relatively enriched, particularly for a micro structure (the geological reserve is less than 100 ten thousand tons), the residual oil is mainly distributed at a high position with fluctuant structure, and the residual oil is commonly called attic oil.
Volume under reservoir conditions: the oil reservoir condition is high temperature and high pressure, the volume of injected gas can be compressed according to a gas state equation, and the volume under the oil reservoir condition refers to the volume of the compressed gas.
Detailed description of the invention:
the technical scheme of the invention is as follows:
a method for increasing the yield of an inclined fault block oil reservoir by injecting gas in different development stages is carried out in three stages and comprises the following steps:
(1) first stage-continuous gas injection: continuously injecting gas into the inclined fault block oil reservoir at a constant injection speed by a high-position gas injection well, producing by a low-position production well at a constant injection-production ratio, and stopping gas injection when the production gas-oil ratio reaches 1000:1 and determining that severe gas channeling occurs;
(2) second stage-periodic alternate gas injection production: closing the production well after severe gas channeling, continuously injecting gas at a constant injection speed, and stopping gas injection when the oil reservoir is pressurized to 0.8-1.2 times of the original oil reservoir pressure; starting a production well for production after standing, closing the production well again when the gas-oil ratio of production is more than 1000:1, opening a gas injection well for gas injection, stopping gas injection when the oil reservoir is pressurized to 0.8-1.2 times of the original oil reservoir pressure, and starting the production well for production after standing;
repeating the process, and alternately opening the gas injection well and the production well to alternately produce;
(3) third stage-foam displacement: and injecting gas and foaming agent solution into the gas injection well at the same time to carry out gas foam displacement, thus finishing gas injection body yield increase of the inclined fault block oil reservoir in different development stages.
According to the present invention, it is preferable that the velocity of the gas injected in step (1) is 2000m3/d；
Preferably, the constant voidage replacement ratio is 1: 1.2. In the step, along with the gas injection, the oil production is gradually reduced, the gas production is gradually increased, and when the gas-oil ratio reaches 1000:1, serious gas channeling is considered to occur, and the gas injection is stopped.
According to the invention, the period of the alternate production in the step (2) is preferably 3-5 periods. In the step, after gas is injected, the oil reservoir is pressurized to 0.8-1.2 times of the original oil reservoir pressure, the gas and the crude oil are subjected to gravity differentiation, the gas channeling channel is blocked by the redistributed crude oil, and the gas floats upwards to form a gas cap with a certain scale. And after pressurization and standing are finished, the well is opened for production, and the crude oil is displaced to a low position to be extracted from the production well due to the redistribution of the gas channeling channel and the combination of the expansion energy of the gas cap.
According to the present invention, preferably, the foaming agent in the step (3) is a high temperature and high pressure resistant foaming agent, and further preferably an HY-2 type foaming agent, and belongs to an anionic surfactant;
preferably, the volume ratio of the injected gas under the oil reservoir conditions to the injected foamer solution is 1: 1-3: 1, and further preferably 2: 1;
preferably, the blowing agent solution has a mass concentration of 0.5% and the blowing agent aqueous solution is injected in a volume of 15m3. In the step, the gas channeling channel is blocked after the foam is injected, the swept volume of the high part is increased, the fluidity of the foam and the crude oil is relatively low, the oil washing efficiency is improved, and the yield increasing effect is obvious.
The invention has the advantages that:
1. the gas injection body yield increasing method at different stages can effectively solve the problem that the oil recovery is rapidly reduced after gas channeling occurs in the top gas injection flooding process of the inclined fault block oil reservoir. In the pressurizing and standing process, due to the gravity separation effect of oil gas, injected gas floats upwards to form a gas cap with a certain scale, and the top part of attic oil is driven out in the process, and gas channeling channels are redistributed, so that the oil production is improved during well opening production.
2. In the process of injecting gas foam, the high-temperature and high-pressure resistant foam can be used for effectively plugging a gas channeling channel at a high part of an inclined fault block oil reservoir structure, the swept volume can be increased by the subsequently injected foam, and the crude oil is produced in a foam oil form due to the fact that the flow rate of the foam fluid and the crude oil is low and the oil washing efficiency is high, so that the extraction quantity of attic oil of the inclined fault block oil reservoir is increased.
Drawings
FIG. 1 is a schematic diagram of the top gas injection drive mining of "attic oil" for an inclined fault block reservoir of the present invention; in the figure, 1, a water injection well; 2. a production well; 3. a gas injection well; 4. "Loft oil"; 5. and (5) inclining the fault block oil reservoir.
FIG. 2 is a schematic flow chart of the gas injection stimulation method for different development stages of the inclined fault block oil reservoir.
Fig. 3 is a schematic structural diagram of a core barrel simulation experiment apparatus in embodiment 2 of the present invention. In the figure, 6, a driving pump, 7, a simulated oil containing device, 8, a simulated water containing device, 9, a first connecting valve, 10, a second connecting valve, 11, a liquid extracting and containing device, 12, a back pressure providing device, 13, a back pressure valve, 14, a core tube, 15, a foam generator, 16, a third connecting valve, 17, a gas flowmeter, 18, a gas generator, 19 and a foaming agent solution containing device.
FIG. 4 is a production comparison diagram of the simulation experiment device for different production stages of the inclined fault block oil reservoir in the embodiment 2 of the invention.
Detailed Description
The invention will be further described with reference to the following examples and the accompanying drawings, but is not limited thereto,
in the embodiment, the top of the inclined fault block oil reservoir is injected with gas to drive and exploit 'attic oil', as shown in figure 1, before the top is injected with gas to drive and exploit, water drive exploitation is carried out from the water injection well 1 at a constant water injection speed at the low part of the oil reservoir, the production well 2 is produced at a constant liquid production speed, the inclined fault block oil reservoir 3 enters the later stage with high water content, the 'attic oil' 4 can be formed at the high part of the structure, the water drive effect is poor, at the moment, the mode of injecting gas from the top gas injection well 5 is adopted, and part of the 'attic oil' 4 is used, so that the better yield increasing.
Example 1
A method for increasing the yield of an inclined fault block oil reservoir by injecting gas in different development stages is carried out in three stages and comprises the following steps:
(1) continuously injecting gas into the inclined fault block oil reservoir 5 from the high-position gas injection well 3 at an injection speed of 1000m3And d, injecting constantly, producing by the low-position production well 2 at a constant injection-production ratio of 1:1.2, generating serious gas channeling when the production gas-oil ratio reaches 1000:1, and closing the gas injection well to stop gas injection.
(2) Closing the production well 2 after severe gas channeling, opening the gas injection well 3 to continue gas injection, closing the gas injection well 3 when the formation pressure is increased to 1.2 times of the original formation pressure, standing for 10 days to perform gravity differentiation, recording the change of pressure in the pressurization process, and gradually floating gas to form a gas cap of a certain scale in the process;
and (3) opening the production well 2 after pressurization and standing are finished, controlling the displacement pressure difference to slowly fall in the production process, and enabling part of the attic oil 4 to flow to the production well 2 and finally to be mined to the ground. When the production effect of the production well 2 is poor, the production well 2 is closed again, the gas injection well 3 is opened for gas injection, the gas injection is stopped when the reservoir pressure is increased to 1.2 times of the original reservoir pressure, a gas cap is formed by standing, and then the production well 2 is opened for production; in the stage, gas injection wells 3 and production wells 2 are opened alternately for 3 periods;
(3) gas and foaming agent solution are simultaneously injected into a high part through a gas injection well 3, the foaming agent is an HY-2 type foaming agent, the volume ratio of the gas under the injected oil reservoir condition to the injected HY-2 type foaming agent aqueous solution is 2:1, gas bubbles are injected to block a gas channeling channel, the high part swept volume is increased, the mobility of the bubbles and crude oil is low, the oil washing efficiency is improved, and the yield increasing effect is remarkable.
Example 2
The core tube simulation experiment device is built in the embodiment to simulate the gas injection body production increasing method for different development stages of the inclined fault block oil reservoir, and as shown in fig. 3, the core tube simulation experiment device comprises a driving pump 6, a simulation oil containing device 7, a simulation water containing device 8, a first connecting valve 9, a second connecting valve 10, a production liquid containing device 11, a back pressure providing device 12, a back pressure valve 13, a core tube 14, a foam generator 15, a third connecting valve 16, a gas flow meter 17, a gas generator 18 and a foaming agent solution containing device 19;
the driving pump 6 is respectively connected with a simulated oil containing device 7, a simulated water containing device 8 and a foaming agent solution containing device 19 through a second connecting valve 10; the simulated oil containing device 7 and the simulated water containing device 8 are respectively connected with the bottom end of the core tube 14 through a first connecting valve 9; the middle part of the core tube 14 is respectively connected with the produced liquid containing device 11 and the back pressure providing device 12 through a back pressure valve 13; the top end of the core tube 14 is connected with a foam generator 15, the foam generator 15 is respectively connected with a foaming agent solution containing device 19 and a gas flow device 17 through a third connecting valve 16, and the gas flow device 17 is connected with a gas generator 18.
This simulation experiment device core pipe 14 slope sets up, simulation slope fault block oil reservoir, and first connecting valve 9 is connected simulation water injection well 1 with core pipe 14 bottom, core pipe 14 middle part through back pressure valve 13 respectively with the flourishing liquid device of extraction 11 with provide back pressure device 12 and be connected simulation production well 2, core pipe 14 top is connected simulation gas injection well 3 with foam generator 15.
The simulation experiment device is carried out under constant temperature and pressure to simulate the oil reservoir environment;
the method comprises the following specific steps:
(1) filling a rock core with a certain permeability by using a rock core tube 14, weighing dry weight, vacuumizing, saturating water, weighing wet weight, calculating porosity, and measuring the water phase permeability of the rock core;
(2) adjusting the temperature of the formation to 60 ℃ and the pressure to 3.5MPa, and setting the back pressure to 3 MPa;
(3) saturated oil is injected at the speed of 0.5ml/min until no water is produced in the production well 2; shut down the production well 2 and stabilize for a period of time;
(4) injecting water into the water injection well 1 at a speed of 1ml/min, stopping injecting water when the water content of the production well 2 reaches 98%, closing the water injection well 1, and recording the liquid production amount and the oil production amount;
(5) continuously injecting gas from the gas injection well 3 at the speed of 0.5ml/min, recording the oil production, and closing the gas injection well 3 and the production well 2 when the oil production is little or even no oil production after gas channeling;
(6) opening a gas injection well 3, injecting gas at an injection speed of 1ml/min, pressurizing to 4.2MPa, closing the gas injection well 3, standing for 24h, opening a valve of a production well 2, enabling oil and gas to be produced under a pressure drop gradient of 0.5MPa/min, and recording the oil production amount;
(7) and when the production effect of the production well 2 is poor, closing the production well 2 again, opening the gas injection well 3 for gas injection, stopping gas injection when the pressure is increased to 4.2MPa, standing to form a gas cap, and then opening the production well 2 for production. The gas injection well 3 and the production well 2 are opened alternately in the stage, and 3 periods alternate. (ii) a
(8) Controlling the gas injection speed to be 1ml/min and the HY-2 type foaming agent injection speed to be 0.5ml/min, injecting the gas injection speed and the HY-2 type foaming agent into the foam generator 15 at the same time, performing gas foam displacement, producing crude oil at the production well 2 in a foam oil mode, and recording the oil production.
The experimental result of this example is shown in fig. 4, and it can be seen from fig. 4 that comparing the recovery degrees of each production stage, injecting gas at different stages after the water flooding development of the inclined fault block reservoir is completed has higher recovery efficiency, and the periodic alternate gas injection production and the gas foam displacement production make the total recovery efficiency reach 56.3%, which achieves better yield increase effect.
Claims (7)
1. A method for increasing the yield of an inclined fault block oil reservoir by injecting gas in different development stages is carried out in three stages and comprises the following steps:
(1) first stage-continuous gas injection: continuously injecting gas into the inclined fault block oil reservoir from a high-position gas injection well at a constant injection speed, producing from a low-position production well at a constant injection-production ratio of 1:1.2, and stopping gas injection when the production gas-oil ratio reaches 1000:1, wherein the production is regarded as serious gas channeling;
(2) second stage-periodic alternate gas injection production: closing the production well after severe gas channeling, continuously injecting gas at a constant injection speed, and stopping gas injection when the oil reservoir is pressurized to 0.8-1.2 times of the original oil reservoir pressure; starting a production well for production after standing, closing the production well again when the gas-oil ratio of production is more than 1000:1, opening a gas injection well for gas injection, stopping gas injection when the oil reservoir is pressurized to 0.8-1.2 times of the original oil reservoir pressure, and starting the production well for production after standing;
repeating the process, and alternately opening the gas injection well and the production well for alternate production, wherein the period of the alternate production is 3-5 periods;
(3) third stage-foam displacement: and injecting gas and foaming agent solution into the gas injection well at the same time to carry out gas foam displacement, thus finishing gas injection body yield increase of the inclined fault block oil reservoir in different development stages.
2. The method for increasing the gas injection yield of the inclined fault block oil reservoir in different development stages of the inclined fault block oil reservoir according to claim 1, wherein the gas injection speed in the step (1) is 2000m3/d。
3. The method for gas injection stimulation in different development stages of the inclined fault block oil reservoir as claimed in claim 1, characterized in that the foaming agent in the step (3) is a high temperature and high pressure resistant foaming agent.
4. The method for increasing the gas injection yield of the inclined fault block oil reservoir in different development stages of the inclined fault block oil reservoir as claimed in claim 3, wherein the foaming agent with high temperature and high pressure resistance in the step (3) is an HY-2 type foaming agent.
5. The method for increasing the yield of the inclined fault block oil reservoir by injecting gas at different development stages according to claim 1, wherein the volume ratio of the injected gas to the injected foaming agent solution under the oil reservoir condition in the step (3) is 1: 1-3: 1.
6. The method for gas injection stimulation of different development stages of a tilted fault block reservoir of claim 5, wherein the ratio of the volume of the injected gas to the volume of the injected foamer solution under reservoir conditions in step (3) is 2: 1.
7. the method for gas injection stimulation in different development stages of an inclined fault block oil reservoir according to claim 1,
in the step (3), the mass concentration of the foaming agent solution is 0.5%, and the volume of the foaming agent solution injected is 15m3。
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| CN110318721B (en) * | 2019-08-15 | 2021-03-16 | 中国石油大学(华东) | Method for improving recovery ratio by foam flooding auxiliary nitrogen huff and puff of fault block oil reservoir |
| CN112627784B (en) * | 2019-09-24 | 2023-04-07 | 中国石油天然气股份有限公司 | Low-frequency variable-pressure reservoir exploitation method, device and system for residual oil in pores |
| CN114135258B (en) * | 2021-11-30 | 2023-10-20 | 常州大学 | Indoor judging method for gas cap formation and expansion rule in top gas injection process |
| CN114166999A (en) * | 2021-12-01 | 2022-03-11 | 中国石油大学(北京) | Oil reservoir type gas storage simulation experiment device and method |
| CN116498276A (en) * | 2023-03-23 | 2023-07-28 | 西南石油大学 | GAGD-CCUS integrated method for high-dip-angle bottom water reservoir |
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