CN110552671A - Method for realizing high-efficiency development of heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding - Google Patents
Method for realizing high-efficiency development of heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding Download PDFInfo
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- CN110552671A CN110552671A CN201910857776.8A CN201910857776A CN110552671A CN 110552671 A CN110552671 A CN 110552671A CN 201910857776 A CN201910857776 A CN 201910857776A CN 110552671 A CN110552671 A CN 110552671A
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- Prior art keywords
- dimethyl ether
- oil reservoir
- flooding
- well
- heavy oil
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- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000000295 fuel oil Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 31
- 239000010779 crude oil Substances 0.000 claims description 25
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000002474 experimental method Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 2
- 239000013043 chemical agent Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
Landscapes
- 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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
the invention discloses a method for realizing high-efficiency development of a heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding, which combines CO 2 flooding with dimethyl ether serving as a chemical agent, firstly mixes the dimethyl ether with CO 2 according to a certain proportion, then injects mixed fluid into the heavy oil reservoir from an injection well for displacement, simultaneously opens a production well for production, and controls the bottom hole flowing pressure of the production well to be higher than the minimum miscible pressure of a dimethyl ether/CO 2 mixture and a heavy oil system.
Description
Technical Field
The invention relates to the technical field of oil and gas field development engineering, in particular to a method for realizing high-efficiency development of a heavy oil reservoir by using a high-efficiency cosolvent, namely dimethyl ether, to assist CO 2 flooding.
Background
the CO 2 flooding is a gas flooding enhanced recovery method which is developed most rapidly at present and is widely used in China, America, Canada, Turkey and other countries at present, the CO 2 flooding has the advantages of low cost, wide applicable conditions, remarkable enhanced recovery effect and the like, and simultaneously has the effects of promoting CO 2 sequestration, relieving greenhouse gas CO 2 emission and the like, and has good ecological benefit and wide application prospect.
At present, a CO 2 flooding method is mainly divided into miscible-phase flooding and immiscible-phase flooding, the recovery ratio of the former is far higher than that of the latter, the miscible-phase flooding is mainly applied in a field, CO 2 is dissolved in crude oil, the viscosity of the crude oil can be obviously reduced, the flow capacity of the crude oil is increased, the crude oil can be subjected to unequal volume expansion of 10% -100%, the kinetic energy of the crude oil is increased, the oil displacement efficiency is improved, the formation pressure is continuously increased along with the injection of CO 2, the phase interface between CO 2 and the crude oil disappears, the two reach a miscible-phase state, the oil displacement effect is excellent, the microcosmic oil displacement efficiency is close to 100% theoretically, however, in the actual CO 2 miscible-phase flooding process, in order to ensure that CO 2 and the crude oil reach a completely miscible-phase state, the high formation injection pressure is easy to fracture the formation, the development cost is greatly increased, the potential safety risk caused by the field construction is greatly reduced, in addition, the extraction effect of CO 5635, the light components in the crude oil can be gradually extracted from the crude oil, the viscosity after the CO 2 is increased, the viscosity of the viscosity after the CO 2 is greatly increased, the viscosity of the crude oil is reduced, the heavy oil is greatly reduced, the heavy oil is effectively reduced, the heavy oil is effectively, the heavy oil is easily mixed-phase.
Disclosure of Invention
The invention combines dimethyl ether and CO 2 flooding, firstly, the dimethyl ether and CO 2 are mixed on the ground according to a certain proportion, then mixed fluid is injected into a specified heavy oil reservoir from an injection well at a certain injection speed, and a production well collects produced fluid.
The technical scheme of the invention mainly comprises the following steps:
(1) Selecting an oil reservoir object, namely selecting an oil reservoir as a mining object according to regional geological data, wherein the oil reservoir is characterized in that the oil reservoir depth is 600-4000m, the thickness is 5-60m, the average permeability is 5-2000md, the viscosity of the stratum crude oil is more than 1000mPa & s, and the density of the crude oil is more than 0.9g/cm 3;
(2) Well position selection: two vertical wells are drilled in the oil reservoir, the stratum is completely shot, the well distance is 150-350m, one of the wells is selected as an injection well, and the other well is selected as a production well;
(3) Acquiring formation crude oil in the oil reservoir, and determining the minimum miscible pressure of a dimethyl ether (5-50 mol%)/CO 2 mixture and the formation crude oil under the formation condition through an indoor experiment;
(4) Injecting fluid displacement, namely mixing CO 2 and dimethyl ether in a ground gas injection device according to a certain proportion, wherein the mole fraction of the mixed dimethyl ether is 5-50 mol%, injecting the mixed fluid into a thick oil layer through a shaft, and totally injecting 0.5-1.0PV mixed fluid at the injection speed of 10-25 t/d;
(5) And (3) well opening production: opening the production well while injecting mixed fluid for displacement, and controlling the bottom hole flowing pressure of the production well to be greater than the minimum miscible phase pressure measured by an indoor experiment by 1.0-5.0MPa and lower than the minimum fracture pressure of the stratum in order to ensure that the injected mixed fluid and the thick oil of the stratum are fully miscible;
(6) And (3) recovering and utilizing the produced liquid, namely separating CO 2 and dimethyl ether in the produced liquid by a ground separation device, mixing the recovered and separated CO 2 and dimethyl ether according to a certain proportion, and injecting the mixture back to the specified heavy oil reservoir.
compared with the prior art, the invention has the following advantages:
(1) the invention firstly provides a method for realizing high-efficiency development of a heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding;
(2) The dimethyl ether adopted by the invention can effectively inhibit the volatilization of light components in the crude oil, weaken the extraction effect of CO 2 on the thickened oil, obviously reduce the miscible pressure of CO 2 and the crude oil, reduce the risk of stratum fracture, improve the development effect and improve the crude oil recovery ratio;
(3) The dimethyl ether can promote the dissolution of CO 2 in the thickened oil, is beneficial to the burying and storage of CO 2 in a thickened oil reservoir, relieves the emission of greenhouse gas CO 2, and has good ecological benefit.
drawings
FIG. 1 is a schematic diagram of a method for realizing high-efficiency development of heavy oil reservoirs by utilizing dimethyl ether to assist CO 2 flooding;
wherein: 1. injection well, 2, production well, 3, surface, 4, fluid flow direction, 5, top cap, 6, reservoir.
FIG. 2 is a graph of experimentally measured minimum miscible pressure comparison of pure CO 2 flood and 20% dimethyl ether assisted CO 2 flood with crude oil.
Figure 3 is a graph comparing pure CO 2 flooding with 20% dimethyl ether assisted CO 2 flooding oil recovery from numerical simulation.
Detailed Description
the invention is further described with reference to the following drawings, which are provided as examples to illustrate the invention and not to limit the scope of the invention.
(1) as shown in figure 1, according to regional geological data, selecting an oil reservoir 6, wherein the depth of the oil reservoir 6 is 600-4000m, the thickness is 5-60m, the average permeability is 5-2000md, the viscosity of crude oil is more than 1000mPa · s, and the density is more than 0.9g/cm 3;
(2) As shown in figure 1, one injection vertical well 1 and one production vertical well 2 are drilled in an oil reservoir 6, the distance between the two wells is 150-350m, and the injection well 1 and the production well 2 penetrate through the whole oil reservoir 6 and are all jetted;
(3) as shown in fig. 2, the formation oil in the reservoir 6 is taken, and the minimum miscible pressure of 20% dimethyl ether auxiliary CO 2 flooding measured by indoor experiments is 10.4MPa, which is 26.76% lower than the minimum miscible pressure of 14.2MPa of pure CO 2 flooding;
(4) mixing CO 2 and dimethyl ether at a ratio of 4:1 in advance by a ground gas injection device;
(5) As shown in figure 1, 3 mixed gas segments of 1PV are respectively injected into an oil reservoir 6 in a gas-water alternating injection mode, the gas-water ratio is 1:1, the gas injection speed is 15t/d, and then the subsequent water flooding is carried out;
(6) as shown in figure 1, the mixed gas is injected into an injection well 1, and simultaneously, a production well 2 is opened for production, and in order to ensure that the injected mixed gas is fully mixed with the formation crude oil, the bottom flow pressure of the production well 2 is controlled to be 12 MPa;
(7) Separating the produced liquid of the production well 2 to separate CO 2 and dimethyl ether in the produced liquid, and injecting the separated CO 2 and dimethyl ether into the oil reservoir 6 again through the steps 4 and 5;
the above parts which are not described in detail are the common general knowledge of those skilled in the art, the present invention is not limited to the above best mode, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. a method for realizing high-efficiency development of a heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding comprises the following steps:
(1) Selecting an oil reservoir object, namely selecting an oil reservoir as a mining object according to regional geological data, wherein the oil reservoir is characterized in that the oil reservoir depth is 600-4000m, the thickness is 5-60m, the average permeability is 5-2000md, the viscosity of the stratum crude oil is more than 1000mPa & s, and the density of the crude oil is more than 0.9g/cm 3;
(2) Well position selection: two vertical wells are drilled in the oil reservoir, the stratum is completely shot, the well distance is 150-350m, one of the wells is selected as an injection well, and the other well is selected as a production well;
(3) acquiring formation crude oil in the oil reservoir, and determining the minimum miscible pressure of a dimethyl ether (5-50 mol%)/CO 2 mixture and the formation crude oil under the formation condition through an indoor experiment;
(4) Injecting fluid displacement, namely mixing CO 2 and dimethyl ether in a ground gas injection device according to a certain proportion, wherein the mole fraction of the mixed dimethyl ether is 5-50 mol%, injecting the mixed fluid into a thick oil layer through a shaft, and totally injecting 0.5-1.0PV mixed fluid at the injection speed of 10-25 t/d;
(5) and (3) well opening production: opening the production well while injecting mixed fluid for displacement, and controlling the bottom hole flowing pressure of the production well to be greater than the minimum miscible phase pressure measured by an indoor experiment by 1.0-5.0MPa and lower than the minimum fracture pressure of the stratum in order to ensure that the injected mixed fluid and the thick oil of the stratum are fully miscible;
(6) And (3) recovering and utilizing the produced liquid, namely separating CO 2 and dimethyl ether in the produced liquid by a ground separation device, mixing the recovered and separated CO 2 and dimethyl ether according to a certain proportion, and injecting the mixture back to the specified heavy oil reservoir.
2. The method for realizing high-efficiency development of the heavy oil reservoir by utilizing the dimethyl ether to assist the CO 2 flooding as claimed in claim 1, wherein the reservoir depth is 600-4000m, the thickness is 5-60m, the average permeability is 5-2000md, the viscosity of the crude oil in the stratum is more than 1000 mPa-s, and the density is more than 0.9g/cm 3.
3. the method for realizing the high-efficiency development of the heavy oil reservoir by utilizing the dimethyl ether to assist the CO 2 flooding as claimed in claim 1, wherein the well spacing of the injection well and the production well is 150-350 m.
4. The method for realizing the high-efficiency development of the heavy oil reservoir by utilizing the dimethyl ether to assist the CO 2 flooding as claimed in claim 1, wherein the CO 2 is mixed with the dimethyl ether in an earth-based gas storage tank, and the mole fraction of the mixed dimethyl ether is 5-50 mol%.
5. The method for realizing high-efficiency development of the heavy oil reservoir by utilizing the dimethyl ether to assist the CO 2 flooding as claimed in claim 1, wherein the injection mode is that the mixed fluid is injected into the heavy oil reservoir through a well bore, the total injection speed is 0.5-1.0PV of the mixed fluid, and the injection speed is 10-25 t/d.
6. the method for realizing the high-efficiency development of the heavy oil reservoir by utilizing the dimethyl ether to assist the CO 2 flooding as claimed in claim 1, wherein the bottom hole flowing pressure of the production well is controlled to be 1.0-5.0MPa higher than the minimum miscible pressure measured by an indoor experiment and lower than the minimum fracture pressure of the stratum.
7. The method for realizing the high-efficiency development of the heavy oil reservoir by utilizing the dimethyl ether to assist the CO 2 flooding as claimed in claim 1, wherein CO 2 and dimethyl ether in the produced fluid are separated by a ground separation device and then injected back into the stratum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857776.8A CN110552671B (en) | 2019-09-09 | 2019-09-09 | CO auxiliary by dimethyl ether 2 Method for realizing high-efficiency development of heavy oil reservoir by flooding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857776.8A CN110552671B (en) | 2019-09-09 | 2019-09-09 | CO auxiliary by dimethyl ether 2 Method for realizing high-efficiency development of heavy oil reservoir by flooding |
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| Publication Number | Publication Date |
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| CN110552671A true CN110552671A (en) | 2019-12-10 |
| CN110552671B CN110552671B (en) | 2022-09-20 |
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| CN201910857776.8A Active CN110552671B (en) | 2019-09-09 | 2019-09-09 | CO auxiliary by dimethyl ether 2 Method for realizing high-efficiency development of heavy oil reservoir by flooding |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187450A (en) * | 2021-06-11 | 2021-07-30 | 中国石油大学(北京) | CO (carbon monoxide)2Electric reduction burying and oil extraction method |
| CN113389533A (en) * | 2021-07-05 | 2021-09-14 | 西南石油大学 | CO (carbon monoxide)2Integrated method for collecting, reservoir reforming and extracting crude oil |
| CN114439439A (en) * | 2020-11-02 | 2022-05-06 | 中国石油化工股份有限公司 | Method for reducing viscosity of heavy oil in heavy oil reservoir and application |
| CN114482944A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Method for realizing CO by underground multistage contact separation2Miscible flooding method |
| WO2023244855A1 (en) * | 2022-06-17 | 2023-12-21 | Air Products And Chemicals, Inc. | Methods and systems to manage impure co2 injection |
| US20240067866A1 (en) * | 2022-08-23 | 2024-02-29 | Saudi Arabian Oil Company | Ether and carbon dioxide mixtures to enhance hydrocarbon recovery from an underground formation |
| CN117627598A (en) * | 2024-01-25 | 2024-03-01 | 新疆新易通石油科技有限公司 | CO improvement under non-miscible condition 2 Method for dissolving gas driving capacity |
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2019
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114482944A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Method for realizing CO by underground multistage contact separation2Miscible flooding method |
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| CN114439439A (en) * | 2020-11-02 | 2022-05-06 | 中国石油化工股份有限公司 | Method for reducing viscosity of heavy oil in heavy oil reservoir and application |
| CN113187450A (en) * | 2021-06-11 | 2021-07-30 | 中国石油大学(北京) | CO (carbon monoxide)2Electric reduction burying and oil extraction method |
| CN113389533A (en) * | 2021-07-05 | 2021-09-14 | 西南石油大学 | CO (carbon monoxide)2Integrated method for collecting, reservoir reforming and extracting crude oil |
| CN113389533B (en) * | 2021-07-05 | 2022-03-29 | 西南石油大学 | CO (carbon monoxide)2Integrated method for collecting, reservoir reforming and extracting crude oil |
| WO2023244855A1 (en) * | 2022-06-17 | 2023-12-21 | Air Products And Chemicals, Inc. | Methods and systems to manage impure co2 injection |
| US20240067866A1 (en) * | 2022-08-23 | 2024-02-29 | Saudi Arabian Oil Company | Ether and carbon dioxide mixtures to enhance hydrocarbon recovery from an underground formation |
| WO2024044245A1 (en) * | 2022-08-23 | 2024-02-29 | Saudi Arabian Oil Company | Ether and carbon dioxide mixtures to enhance hydrocarbon recovery from an underground formation |
| CN117627598A (en) * | 2024-01-25 | 2024-03-01 | 新疆新易通石油科技有限公司 | CO improvement under non-miscible condition 2 Method for dissolving gas driving capacity |
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| CN110552671B (en) | 2022-09-20 |
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