CN110541693B - Low permeability thick sandstone reservoir CO2Driving and drainage composite development method - Google Patents
Low permeability thick sandstone reservoir CO2Driving and drainage composite development method Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000035699 permeability Effects 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 110
- 239000003921 oil Substances 0.000 claims abstract description 89
- 238000002347 injection Methods 0.000 claims abstract description 85
- 239000007924 injection Substances 0.000 claims abstract description 85
- 239000010779 crude oil Substances 0.000 claims abstract description 27
- 230000008878 coupling Effects 0.000 claims abstract description 19
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 230000005484 gravity Effects 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000000605 extraction Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 9
- 230000009471 action Effects 0.000 abstract description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 43
- 238000005516 engineering process Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000003129 oil well Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002195 synergetic effect Effects 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
- E21B43/164—Injecting CO2 or carbonated water
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Abstract
The invention provides a low-permeability thick-layer sandstone reservoir CO2A flooding composite development method, the low permeability thick-layer sandstone reservoir CO2The drive-drain composite development method comprises the following steps: step 1, selecting an oil reservoir to be developed; step 2, CO is carried out2A handling stage; step 3, performing a gas cap forming stage; step 4, performing injection-production coupling stage; and 5, performing a driving and discharging composite stage. The invention is used for slowing down CO2Gas flooding angle to CO2And adjusting a development mode with an unsatisfactory development effect in the later period. By utilizing the stable gas cap between injection and production wells and the gravity action of crude oil, the problem that the crude oil at the bottom is difficult to use due to the gas overburden effect is effectively solved, and CO is realized2And (5) carrying out efficient and stable development on the closed boundary oil reservoir in the later flooding period.
Description
Technical Field
The invention relates to the technical field of oil field development, in particular to a low-permeability thick-layer sandstone reservoir CO2A composite development method for expelling and discharging.
Background
Low permeability reservoir using CO2The flooding can greatly improve the recovery ratio of the oil reservoir, and the conventional CO injection is adopted for the thick-layer low-permeability sandstone oil reservoir2After development, due to CO2The gas density is lower than the crude oil density, so that the injected gas is overlayed on the top of an oil layer, the crude oil at the middle lower part of the oil layer cannot be fully used, the internal wave and the internal wave of the thick-layer oil reservoir are low, and the recovery ratio is low.
At present, injection profiles are adjusted by adopting modes of gas-water alternation, foam slug injection and the like, but the modes of gas-water alternation, foam slug injection and the like are effective in the initial stage due to limited injection capability of a low-permeability reservoir, the injection failure effect is gradually poor due to high formation pressure in the later stage, the problems of shaft corrosion prevention, injection equipment and the like caused by different injection media need to be considered at the same time in the field, and the injection cost is high. Therefore, the novel low-permeability thick-layer sandstone reservoir CO is invented2A driving and discharging composite development method solves the technical problems.
Disclosure of Invention
The invention aims to provide a method for comprehensively utilizing CO2Huff and puff, injection-production coupling, gravity drainage and CO2Drives out the synergistic effect, implements CO2Low-permeability thick-layer sandstone reservoir CO for flooding composite development2A composite development method for expelling and discharging.
The object of the invention can be achieved by the following technical measures: low permeability thick sandstone reservoir CO2A flooding composite development method, the low permeability thick-layer sandstone reservoir CO2The drive-drain composite development method comprises the following steps: step 1, selecting an oil reservoir to be developed; step 2, CO is carried out2A handling stage; step 3, performing a gas cap forming stage; step 4, performing injection-production coupling stage; and 5, performing a driving and discharging composite stage.
The object of the invention can also be achieved by the following technical measures:
in step 1, the oil reservoirs suitable for the development method are screened according to the following conditions: the oil reservoir is a closed boundary oil reservoir, the buried depth is less than 4000m, the injection-production well spacing is more than 300m, the saturation of the residual oil is more than 0.5, the thickness of the oil layer is more than 20m, the horizontal permeability is more than 5mD, the ratio of the vertical permeability to the horizontal permeability is more than 0.2, the porosity of the oil layer is more than 0.15, and the dip angle of the stratum is less than 10 degrees.
In step 2, plugging a perforation section at the lower part of the gas injection well, and injecting CO into an upper perforation layer2Gas, CO2The injection amount is 150000-3Injection of CO2Closing the well for stewing for 10-20 days; and (5) opening the well for production after the well is stewed, and ending the production when the oil capacity is less than 0.5t/d on the day.
In step 2, the CO is repeated2A throughput phase until: when the oil extraction and CO injection are carried out in a certain period2When the amount is less than 4, the gas cap forming stage is changed.
In step 3, the gas injection well is changed into continuous CO injection at the top2，CO2The injection speed is less than 20000m3D, simultaneously jetting production from the top of the oil layer by a production well, wherein the liquid amount of the production well is less than 10m3D, when the gas-oil ratio of the production well is more than 400m3At/t, a stable gas cap has been formed, and the injection-production coupling stage is changed.
In step 4, the production well is closed and the gas injection well injects CO2Gas 5 days, CO2The injection speed is less than 10000m3D, soaking the well for 5 days, closing the gas injection well, opening the production well, and ensuring that the liquid quantity of the production well is less than 5m3D, production for 20 days.
In step 4, the injection-production coupling stage is repeated until: the gas-oil ratio of the production well is more than 600m3And at the time of/t, changing into a draining composite stage.
In step 5, the gas injection well adopts a double-pipe column structure, and CO is continuously injected into the upper part of the gas injection well2Gas, CO2The injection speed is less than 7500m3D, oil extraction at lower part, liquid extraction speed less than 5m3D, simultaneously plugging the top perforation section by the production well, perforating the bottom of the oil well, and enabling the liquid extraction speed at the bottom of the production well to be less than 5m3D, using the dual functions of gas cap energy displacement and crude oil gravity to make the crude oil in the oil reservoir flow into the bottom, and making it pass through the lower portions of gas injection well and production well to be recoveredThe gas-oil ratio of one well is more than 1000m3When the oil-gas ratio is larger than 1000m, the production well is closed, the well is opened again after 10 to 20 days of closing until the oil-gas ratio is larger than 1000m in 5 days after the production well is opened3And d, finishing production.
The low-permeability thick-layer sandstone reservoir CO of the invention2Flooding composite development method to slow down CO2Gas flooding angle to CO2And adjusting a development mode with an unsatisfactory development effect in the later period. By utilizing the stable gas cap between injection and production wells and the gravity action of crude oil, the problem that the crude oil at the bottom is difficult to use due to the gas overburden effect is effectively solved, and CO is realized2And (5) carrying out efficient and stable development on the closed boundary oil reservoir in the later flooding period.
Drawings
FIG. 1 is a schematic view of a continuous gas drive stabilized gas cap of the present invention;
FIG. 2 is a schematic view of the synergy of gas cap flooding and gravity drainage of the present invention;
FIG. 3 is CO of the present invention2The flooding composite development technology uses a residual oil saturation map of the upper crude oil;
FIG. 4 shows a CO of the present invention2A final residual oil saturation map of the flooding composite development technology;
FIG. 5 shows conventional continuous CO2Developing a final residual oil saturation map;
FIG. 6 is a low permeability thick sandstone reservoir CO of the present invention2A flow diagram of one embodiment of a flooding composite development method.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
FIG. 6 is a representation of the low permeability heavy sandstone reservoir CO of the present invention, as shown in FIG. 62A flow chart of a flooding composite development method.
Selecting an oil reservoir to be developed: the oil reservoirs suitable for the development method are screened according to the following conditions: the oil reservoir is a closed boundary oil reservoir, the buried depth is less than 4000m, the injection-production well spacing is more than 300m, the saturation of the residual oil is more than 0.5, the thickness of the oil layer is more than 20m, the horizontal permeability is more than 5mD, the ratio of the vertical permeability to the horizontal permeability is more than 0.2, the porosity of the oil layer is more than 0.15, and the dip angle of the stratum is less than 10 degrees;
the following development stages were performed in sequence: CO 22The method comprises a huff and puff stage, a gas cap forming stage, an injection-production coupling stage and a flooding composite stage.
In step 101, CO2A throughput phase comprising: plugging the lower perforation section of the gas injection well, and injecting CO into the upper perforation layer2Gas, CO2The injection amount is 150000-3Injection of CO2Closing the well for stewing for 10-20 days; and (5) opening the well for production after the well is stewed, and ending the production when the oil capacity is less than 0.5t/d on the day.
Repeating the CO2A throughput phase until: when oil production (ton) and CO injection are carried out in a certain period2Quantity (10)4Square) is less than 4, the gas cap forming stage is changed. With CO2Increased number of throughput cycles, CO2The throughput effect becomes progressively worse due to the multi-cycle CO2Post-huff and puff CO2The gas forms a gas channeling channel, and CO is injected2Gas is produced quickly and cannot be sufficiently dissolved in crude oil for sequestration in the formation.
CO2The huff and puff stage is realized by injecting CO into the top of the oil layer2The volume of the crude oil is expanded, and the pore volume between the internal structures of the crude oil is increased, so that the crude oil flows in the pores of the medium more smoothly and effectively. At the same time, some immobile crude oil can extrude out of the medium pores under the action of the carbon dioxide dissolution and expansion reaction, so that the saturation of the crude oil is reduced. And under the action of carbon dioxide dissolution reaction, the viscosity level of the crude oil is directly influenced to drop, so that the crude oil at the top part around the gas injection well is fully used.
At step 102, the gas cap formation phase, as shown in FIG. 1, includes: changing gas injection well into continuous CO injection at top2，CO2The injection speed is less than 20000m3D, simultaneously jetting production from the top of the oil layer by a production well, wherein the liquid amount of the production well is less than 10m3D, when the gas-oil ratio of the production well is more than 400m3At t timeAnd forming a stable gas cap, and changing the injection-production coupling stage into the injection-production coupling stage.
CO2The huff and puff stage fully utilizes the residual oil at the top around the gas injection well, and more residual oil is formed between the injection and production wells during the gas cap forming stage, and stable CO is formed2And residual oil between partial injection and production wells is used while the gas cap is used, so that a foundation is laid for later-stage flooding and drainage composite development.
In step 103, the injection-production coupling phase includes: closing the production well, injecting CO into the gas injection well2Gas 5 days, CO2The injection speed is less than 10000m3D, soaking the well for 5 days, closing the gas injection well, opening the production well, and ensuring that the liquid quantity of the production well is less than 5m3D, production for 20 days.
Repeating the injection-production coupling stage until: the gas-oil ratio of the production well is more than 600m3And at the time of/t, changing into a draining composite stage.
The gas channeling is delayed to a certain extent in the injection-production coupling stage, the underground pressure is rebalanced by using the soaking time, and CO is expanded2Driving wave and range of CO2More gas enters small pores and low permeability layers, and residual oil between injection wells and production wells is fully used.
At step 104, the purging recombination phase, as shown in fig. 2, includes: the gas injection well adopts a double-pipe column structure, and CO is continuously injected into the upper part of the gas injection well2Gas, CO2The injection speed is less than 7500m3D, oil extraction at lower part, liquid extraction speed less than 5m3D, simultaneously plugging the top perforation section by the production well, perforating the bottom of the oil well, and enabling the liquid extraction speed at the bottom of the production well to be less than 5m3D, using the dual action of gas cap energy displacement and crude oil gravity to make the crude oil flow into the bottom portion of oil reservoir, and making it pass through the lower portion of gas injection well and production well, when the gas-oil ratio of any well is greater than 1000m3When the oil-gas ratio is larger than 1000m, the production well is closed, the well is opened again after 10 to 20 days of closing until the oil-gas ratio is larger than 1000m in 5 days after the production well is opened3And d, finishing production.
And in the driving and discharging composite stage, the dual functions of gas cap energy displacement and crude oil gravity are mainly utilized, and meanwhile, an injection-production coupling development mode is adopted for a production well with high gas-oil ratio, so that residual oil at the bottom of an oil reservoir is utilized to the greatest extent.
In a specific embodiment applying the invention, the selected oil reservoir is a closed oil reservoir, the stratum inclination angle is 5 degrees, and water injection cannot be carried out for energy supplement. The formation pressure is 30MPa, the temperature is 110 degrees, the average porosity is 16 percent, the average air permeability is 10mD, and the effective thickness is 30 m.
The following development stages were performed in sequence: CO 22The method comprises a huff and puff stage, a gas cap forming stage, an injection-production coupling stage and a flooding composite stage.
CO2A throughput phase comprising: plugging the perforation section at the lower part of the gas injection well, and injecting CO into the perforation at the upper part of 10m2Gas, CO2The injection amount is 200000m3Injection of CO2Closing the well for stewing for 15 days; and (5) opening the well for production after the well is stewed, and ending the production when the oil capacity is less than 0.5t/d on the day.
Repeating the CO2A throughput phase until: when oil production (ton) and CO injection are carried out in a certain period2Quantity (10)4Square) is less than 4, the gas cap forming stage is changed.
A gas cap formation phase comprising: changing gas injection well into continuous CO injection at top2，CO2The injection speed is less than 15000m3D, simultaneously jetting 10m of oil layer top for production by a production well, wherein the liquid amount of the production well is 8m3D, when the gas-oil ratio of the production well is more than 400m3At/t, the remaining oil in the near wellbore area at the top of the gas injection well is used, as shown in FIG. 3, and a stable gas cap is formed, and the injection-production coupling stage is changed.
And the injection-production coupling stage comprises: closing the production well, injecting CO into the gas injection well2Gas 5 days, CO2The injection speed is 8000m3D, soaking the well for 5 days, closing the gas injection well, opening the production well, and enabling the liquid volume of the production well to be 4m3D, production for 20 days.
Repeating the injection-production coupling stage until: the gas-oil ratio of the production well is more than 600m3And at the time of/t, changing into a draining composite stage.
A flooding compound phase comprising: the gas injection well adopts a double-pipe column structure, and CO is continuously injected into the upper part of the gas injection well2Gas, CO2The injection speed is 6000m3D, oil extraction is carried out at the lower part of 10m, and the liquid extraction speed is 4m3D, simultaneously plugging the top perforation section by the production well, perforating the bottom of the oil well by 10m, and producing the liquid at the bottom of the production well by 4m3D, using the dual action of gas cap energy displacement and crude oil gravity to make the crude oil flow into the bottom portion of oil reservoir, and making it pass through the lower portion of gas injection well and production well, when the gas-oil ratio of any well is greater than 1000m3Closing the production well when the oil-gas ratio is lower than the gas-oil ratio within 5 days after the production well is opened, and opening the production well again after closing the production well for 10 to 20 days
1000m3And d, utilizing the combined action of displacement and drainage to maximally utilize the residual oil between the injection and production wells, and ending the production as shown in figure 4.
By conventional continuous CO2Driving off the technology due to CO2The gas density is lower than that of crude oil, so that the injected gas is overlayed on the top of an oil layer, crude oil at the middle lower part of the oil layer of the production well cannot be fully used, and the fluctuation of the thick-layer oil reservoir layer is low. As can be seen from the residual oil saturation profile after the numerical simulation, there is a large amount of residual oil not sufficiently available in the middle and lower part of the production well due to the gas overburdening effect, as shown in fig. 5.
Comprehensive contrast, low permeability thick-layer sandstone reservoir CO2Compared with the conventional continuous CO, the flooding composite development technology2The development technology makes full use of the gravity action of the crude oil, effectively slows down the adverse effect caused by the gas overlap action, and can greatly improve the development effect of the oil reservoir.
_______________________________________________________________
Claims (4)
1. Low permeability thick sandstone reservoir CO2The flooding composite development method is characterized in that the CO oil deposit of the low-permeability thick-layer sandstone oil deposit2The drive-drain composite development method comprises the following steps:
step 1, selecting an oil reservoir to be developed;
step 2, CO is carried out2A throughput phase comprising: plugging the lower perforation section of the gas injection well, and injecting CO into the upper perforation layer2Gas, CO2The injection amount is 150000-3Injection of CO2Closing the well for stewing for 10-20 days; after the well is stewed, the well is opened for production, and after the oil capacity is less than 0.5t/d on the day, the production is finished;
step 3, performing a gas cap formation stage, comprising: changing gas injection well into continuous CO injection at top2Gas, CO2The injection speed is less than 20000m3D, simultaneously jetting the top of an oil layer for production by a production well;
and 4, performing injection-production coupling stage, comprising: closing the production well, injecting CO into the gas injection well2Gas 5 days, CO2The injection speed is less than 10000m3D, soaking the well for 5 days, closing the gas injection well, opening the production well, and ensuring that the liquid quantity of the production well is less than 5m3D, production for 20 days;
and 5, performing a driving and discharging composite stage, comprising: the gas injection well adopts a double-tubular structure of external injection and internal production, the bottom perforation of the gas injection well is used as a production end, and the upper part of the gas injection well is continuously injected with CO2Gas, CO2The injection speed is less than 7500m3D, oil extraction is carried out at the bottom of the gas injection well, and the liquid extraction speed is less than 5m3D, simultaneously plugging the top perforation section by the production well, perforating the bottom of the production well, and enabling the liquid extraction speed at the bottom of the production well to be less than 5m3D, utilizing the dual functions of gas cap energy displacement and crude oil gravity to make the crude oil in the upper portion of the oil reservoir flow into the bottom portion, and making it pass through the extraction end of gas injection well and production well bottom portion to make extraction, when the gas-oil ratio of extraction end of gas injection well is greater than 1000m3When the flow rate is in the range of d, the extraction end of the gas injection well is closed, and when the gas-oil ratio at the bottom of the production well is more than 1000m3At/d, the production well is closed; when the gas injection well extraction end and the production well are both closed, the well is opened again after 10 to 20 days until the gas-oil ratio is more than 1000m within 5 consecutive days after the gas injection well extraction end and the production well are opened3D, finishing production;
in step 3, the gas injection well is changed into continuous CO injection at the top2，CO2The injection speed is less than 20000m3D, simultaneously jetting production from the top of the oil layer by a production well, wherein the liquid amount of the production well is less than 10m3D, when the gas-oil ratio of the production well is more than 400m3At/t, a stable gas cap has been formed, and the injection-production coupling stage is changed.
2. According to claim1 the low-permeability thick-layer sandstone reservoir CO2The flooding composite development method is characterized in that in step 1, oil reservoirs suitable for the development method are screened according to the following conditions: the oil reservoir is a closed boundary oil reservoir, the buried depth is less than 4000m, the injection-production well spacing is more than 300m, the saturation of the residual oil is more than 0.5, the thickness of the oil layer is more than 20m, the horizontal permeability is more than 5mD, the ratio of the vertical permeability to the horizontal permeability is more than 0.2, the porosity of the oil layer is more than 0.15, and the dip angle of the stratum is less than 10 degrees.
3. The low permeability thick-bed sandstone reservoir CO of claim 12Flooding composite development method characterized in that said CO of step 2 is repeated2A throughput phase until: when the oil extraction and CO injection are carried out in a certain period2The amount is less than 4t/10000m3Instead, the gas cap formation stage is used.
4. The low permeability thick-bed sandstone reservoir CO of claim 12The flooding composite development method is characterized in that the injection-production coupling stage in the step 4 is repeated until: the gas-oil ratio of the production well is more than 600m3And at the time of/t, changing into a draining composite stage.
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| CN110872942B (en) * | 2019-10-24 | 2021-09-28 | 中国石油化工股份有限公司 | Research method for contribution of different acting forces to recovery ratio in oil reservoir injection-production coupling mode |
| CN113389531A (en) * | 2020-03-12 | 2021-09-14 | 中国石油化工股份有限公司 | CO2Injection-production method, electronic device, and medium |
| CN115773098A (en) * | 2021-09-08 | 2023-03-10 | 中国石油天然气股份有限公司 | Combined mining method for producing gas and improving oil reservoir recovery ratio by underground coal in coal bed and oil reservoir overlapped area |
| CN113847002B (en) * | 2021-09-29 | 2023-03-31 | 中国石油大学(北京) | Method for artificially inducing constructed oil and gas reservoir to generate gas cap oil displacement |
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