CN108397172B - CO of high saturation pressure reservoir2Miscible flooding method - Google Patents
CO of high saturation pressure reservoir2Miscible flooding method Download PDFInfo
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- CN108397172B CN108397172B CN201810237470.8A CN201810237470A CN108397172B CN 108397172 B CN108397172 B CN 108397172B CN 201810237470 A CN201810237470 A CN 201810237470A CN 108397172 B CN108397172 B CN 108397172B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003921 oil Substances 0.000 claims abstract description 122
- 238000004519 manufacturing process Methods 0.000 claims abstract description 58
- 239000010779 crude oil Substances 0.000 claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 239000003345 natural gas Substances 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 5
- 230000004069 differentiation Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000011549 displacement method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method 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
- E21B43/164—Injecting CO2 or carbonated water
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Abstract
CO of the high saturation pressure reservoir of the present application2Miscible flooding method packageComprises the following steps: selecting an oil reservoir with a dip angle in a reservoir layer and the saturation pressure of which is more than 80% of the original oil reservoir pressure; drilling a production well at the middle and high part of the oil reservoir structure, and carrying out pressure reduction exploitation on the oil reservoir; when the reservoir pressure is reduced to saturation pressure, natural gas begins to be released from crude oil and forms a gas-oil interface, and when the gas-oil interface is lowered to a set height value from a perforation position at the uppermost part of the oil production well along with the production of the crude oil, the oil production well stops producing; drilling a gas producing well at a gas cap formed at a high part of an oil reservoir structure to produce natural gas, further reducing the pressure of the oil reservoir to a set pressure value, and stopping the production of the gas producing well; CO injection by drilling an injection well at the lower part of the reservoir structure2While simultaneously opening the producing well for production, CO2The oil displacement is realized by reaching a miscible state with the crude oil. CO of the present application2The miscible-phase oil displacement method can improve the recovery ratio of the high saturation pressure oil reservoir and save the production cost.
Description
Technical Field
The application belongs to the technical field of oil reservoir development, and particularly relates to CO of a high saturation pressure oil reservoir2A miscible flooding method.
Background
The gas flooding technology for improving the oil reservoir exploitation recovery ratio can be divided into non-miscible flooding and miscible flooding, and the miscible flooding effect is best, so that the oil displacement efficiency of the miscible flooding can reach 100% theoretically. In the miscible flooding technique, CO is used2The miscible-phase flooding has the most outstanding oil recovery effect and attractive property, and can ensure that the ultimate recovery rate reaches more than 90 percent.
To realize CO2Miscible flooding, the most critical factor being that the construction or formation pressure is greater than or equal to CO2Minimum miscible pressure with formation crude oil. However, according toAt present, crude oil and CO of high saturation pressure oil reservoir in China2The minimum miscible pressure test result shows that most of oil reservoirs in China have high crude oil viscosity and cannot realize CO2And (4) miscible phase driving. Although CO is injected2The CO can be increased by adding part of liquefied petroleum gas2The miscible capacity with the crude oil of the stratum, but the cost is high, the dosage is large, and the large-area popularization cannot be realized.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present application is to provide a CO for a high saturation pressure reservoir2The miscible-phase oil displacement method is used for improving the recovery ratio of the high saturation pressure oil reservoir and saving the production cost.
In order to solve the technical problem, the application discloses CO of a high saturation pressure oil reservoir2A miscible flooding method. The method comprises the following steps:
selecting an oil reservoir with a dip angle in a reservoir layer and the saturation pressure of which is more than 80% of the original oil reservoir pressure;
drilling a production well at the middle and high part of the oil reservoir structure, and carrying out pressure reduction exploitation on the oil reservoir; when the reservoir pressure is reduced to saturation pressure, natural gas begins to be released from crude oil and forms a gas-oil interface, and when the gas-oil interface is lowered to a set height value from a perforation position at the uppermost part of the oil production well along with the production of the crude oil, the oil production well stops producing;
drilling a gas producing well at a gas cap formed at a high part of an oil reservoir structure to produce natural gas, further reducing the pressure of the oil reservoir to a set pressure value, and stopping the production of the gas producing well;
drilling an injection well at the lower part of the oil reservoir structure, and injecting CO2While simultaneously opening the producing well for production, CO2The oil and the crude oil reach a miscible state, and miscible oil displacement is realized.
The process as described above, preferably in CO2Reach the miscible state with crude oil, after realizing miscible displacement of reservoir oil, still include:
calculating CO at virgin formation conditions2-crude oil miscible pressure;
calculating the degassed crude oil and CO under different decompression ranges2Pressure of mixed phases ofComparing the oil reservoir pressure with the oil reservoir pressure after pressure reduction, and determining the oil reservoir pressure reduction range capable of realizing miscible phase or near miscible phase;
when the descending speed of the gas-oil interface is analyzed, the gravity differentiation effect is favorably utilized to fully separate gas from water;
when the height difference between the gas-water interface and the upper perforation of the oil production well is analyzed, no water cone is generated.
CO of the high saturation pressure reservoir of the present application2The miscible flooding method comprises the following steps: selecting an oil reservoir with a dip angle in a reservoir layer and the saturation pressure of which is more than 80% of the original oil reservoir pressure; drilling a production well at the middle and high part of the oil reservoir structure, and carrying out pressure reduction exploitation on the oil reservoir; when the reservoir pressure is reduced to saturation pressure, natural gas begins to be released from crude oil and forms a gas-oil interface, and when the gas-oil interface is lowered to a set height value from a perforation position at the uppermost part of the oil production well along with the production of the crude oil, the oil production well stops producing; drilling a gas producing well at a gas cap formed at a high part of an oil reservoir structure to produce natural gas, further reducing the pressure of the oil reservoir to a set pressure value, and stopping the production of the gas producing well; drilling an injection well at the lower part of the oil reservoir structure, and injecting CO2While simultaneously opening the producing well for production, CO2The oil and the crude oil reach a miscible state, and miscible oil displacement is realized. The application provides CO of a high saturation pressure reservoir2The miscible phase oil displacement method can improve the recovery ratio of the high saturation pressure oil reservoir and save the production cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is CO of a high saturation pressure reservoir of an embodiment of the present application2A flow chart of a miscible flooding method;
FIG. 2 is CO of a high saturation pressure reservoir of an embodiment of the present application2Schematic diagram of miscible flooding method;
FIG. 3 shows a CO according to example one of the present application2Crude oil miscible pressure regimeA state diagram;
FIG. 4 shows CO of example two of the present application2-a schematic diagram of the miscible pressure regime of crude oil;
FIG. 5 shows CO in example III of the present application2Schematic diagram of the miscible pressure regime of the crude oil.
Detailed Description
Embodiments of the present application will be described in detail below with reference to the drawings and an embodiment of a block of the central oil field branch company, so that how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
FIG. 1 is CO of a high saturation pressure reservoir of an embodiment of the present application2FIG. 2 is a flow chart of a miscible flooding method, and FIG. 2 is a CO of a high saturation pressure reservoir according to an embodiment of the present disclosure2Schematic diagram of miscible flooding method. Referring to fig. 1 and 2, the CO of the high saturation pressure reservoir of the present embodiment2The miscible flooding method comprises the following contents.
S101, selecting an oil reservoir with a dip angle and a saturation pressure greater than 80% of the original oil reservoir pressure.
The reservoir with the dip angle can be a monoclinic structure reservoir or a anticline structure reservoir.
S102, drilling a production well at the middle and high part of the oil reservoir structure, and performing pressure reduction exploitation on the oil reservoir; when the reservoir pressure is reduced to the saturation pressure, natural gas begins to be released from crude oil and forms a gas-oil interface, and when the gas-oil interface is lowered to a set height value from a perforation position at the uppermost part of the production well along with the production of the crude oil, the production well stops producing.
The height value is the height difference between a gas-oil stable interface formed at the last time of oil reservoir decompression exploitation and a perforation at the uppermost part of an oil production well, and in specific application, the height value is determined according to a pressure reduction funnel formed in normal production and the prevention of gas cone formation. When the oil deposit is subjected to decompression exploitation, the oil extraction rate cannot be too high, particularly when the oil deposit pressure is lower than the saturation pressure and natural gas begins to be separated from crude oil, the gas-oil interface is controlled to slowly descend, the gravity differentiation effect under the low oil extraction rate is fully exerted, so that the gas and the oil are fully separated, the residual oil formed at the upper gas top is minimum, and the natural gas bubbles retained in the lower oil layer are minimum.
S103, drilling a gas production well at a gas cap formed at the high part of the oil reservoir structure to produce natural gas, further reducing the pressure of the oil reservoir to a set pressure value, and stopping production of the gas production well.
The purpose of drilling a gas producing well at the high part of an oil reservoir structure to produce gas cap gas is to release more natural gas from crude oil, reduce the content of light components in the crude oil and be beneficial to realizing miscible phase. In specific application, the pressure value can be preset according to the oil reservoir structure and the crude oil characteristics, and is properly adjusted in the production process.
S104, drilling an injection well at the lower part of the oil reservoir structure, and injecting CO2While simultaneously opening the producing well for production, CO2The oil and the crude oil reach a miscible state, and miscible oil displacement is realized.
When the reservoir pressure is reduced to a reasonable level, the requirement that CO can be realized under the reservoir pressure is met2Miscible with crude oil, or reservoir pressure not lower than CO280% of the miscible pressure of the crude oil, i.e. in a near miscible state, and furthermore, the production of gas-cap gas will further cause the gas-oil interface to drop, but it should be ensured that no gas coning will occur during the production of the subsequent production well.
When the injection and production wells work simultaneously, the injection and production balance is required to be kept or the injection is larger than the production, the gas-oil interface is stable or rises slowly, and the gas cone phenomenon in the production well cannot be caused.
FIG. 3 is CO of an embodiment of the present application2Schematic diagram of the miscible pressure regime of the crude oil. With reference to FIG. 3, in CO2Reach the miscible state with crude oil, after realizing miscible displacement of reservoir oil, still include:
calculating CO at virgin formation conditions2-crude oil miscible pressure;
calculating the degassed crude oil and CO under different decompression ranges2Comparing the miscible phase pressure with the depressurized reservoir pressure to determine the reservoir pressure reduction range capable of realizing miscible phase or near miscible phase;
when the descending speed of the gas-oil interface is analyzed, the gravity differentiation effect is favorably utilized to fully separate gas from water;
when the height difference between the gas-water interface and the upper perforation of the oil production well is analyzed, no water cone is generated.
CO during the depressurization of high saturation pressure oil reservoir2Three variations in the relative magnitudes of the minimum miscible pressure of the crude oil and the reservoir pressure are possible, as shown in fig. 3, 4 and 5, respectively. FIG. 3 shows a CO according to example one of the present application2Schematic diagram of the miscible pressure regime of the crude oil. Referring to FIG. 3, CO is produced during the depressurization of oil reservoir2The rate of decrease of minimum miscible pressure of crude oil is much greater than the rate of decrease of reservoir pressure, when the reservoir pressure decreases to a certain value, CO2The minimum miscible pressure of the crude oil is lower than the reservoir pressure. FIG. 4 shows CO of example two of the present application2Schematic diagram of the miscible pressure regime of the crude oil. Referring to FIG. 4, CO is produced during the depressurization of reservoir2The rate of decrease of minimum miscible pressure of crude oil is greater than the rate of decrease of reservoir pressure, but CO2The minimum miscible pressure of the crude oil is always greater than the reservoir pressure. FIG. 5 shows CO in example III of the present application2Schematic diagram of the miscible pressure regime of the crude oil. Referring to FIG. 5, CO is produced during depressurization of oil reservoir2The minimum miscible pressure reduction rate of crude oil is less than the reservoir pressure reduction rate, and the difference between the minimum miscible pressure and the formation pressure is larger and larger along with reservoir development, so that miscible or near-miscible cannot be realized finally.
For the above three cases, the present application proposes two solutions: if the reservoir pressure can reach CO before the reservoir pressure is reduced to 8MPa in the reservoir depressurization exploitation process2More than 80% of the minimum miscible pressure of the crude oil, miscible flooding or near miscible flooding can be achieved. If reservoir pressure is below CO280% of the minimum miscible pressure of the crude oil, then in CO2Before injection, water injection or CO injection is carried out2Increasing reservoir pressure to CO2More than 80% of the minimum miscible pressure of the crude oil, thus achieving subsequent CO2Miscible or near miscible flooding.
In summary, the high saturation pressure reservoir of the present application has CO2The miscible flooding method comprises the following steps: selectingThe reservoir layer is provided with an oil reservoir with an inclination angle and the saturation pressure of which is more than 80% of the original oil reservoir pressure; drilling a production well at the middle and high part of the oil reservoir structure, and carrying out pressure reduction exploitation on the oil reservoir; when the reservoir pressure is reduced to saturation pressure, natural gas begins to be released from crude oil and forms a gas-oil interface, and when the gas-oil interface is lowered to a set height value from a perforation position at the uppermost part of the oil production well along with the production of the crude oil, the oil production well stops producing; drilling a gas producing well at a gas cap formed at a high part of an oil reservoir structure to produce natural gas, further reducing the pressure of the oil reservoir to a set pressure value, and stopping the production of the gas producing well; drilling an injection well at the lower part of the oil reservoir structure, and injecting CO2While simultaneously opening the producing well for production, CO2The oil and the crude oil reach a miscible state, and miscible oil displacement is realized. The application provides CO of a high saturation pressure reservoir2The miscible phase oil displacement method can improve the recovery ratio of the high saturation pressure oil reservoir and save the production cost.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the present application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of numerous other combinations, modifications, and variations within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (1)
1. CO of high saturation pressure oil reservoir2The miscible flooding method is characterized by comprising the following steps:
selecting an oil reservoir with a dip angle in a reservoir layer and the saturation pressure of which is more than 80% of the original oil reservoir pressure;
drilling a production well at the middle and high part of the oil reservoir structure, and carrying out pressure reduction exploitation on the oil reservoir; when the reservoir pressure is reduced to saturation pressure, natural gas begins to be released from crude oil and forms a gas-oil interface, and when the gas-oil interface is lowered to a set height value from a perforation position at the uppermost part of the oil production well along with the production of the crude oil, the oil production well stops producing;
drilling a gas producing well at a gas cap formed at a high part of an oil reservoir structure to produce natural gas, further reducing the pressure of the oil reservoir to a set pressure value, and stopping the production of the gas producing well;
drilling an injection well at the lower part of the oil reservoir structure, and injecting CO2While simultaneously opening the producing well for production, CO2The oil and the crude oil reach a miscible state, and miscible displacement of the oil is realized;
when the reservoir pressure is reduced to a reasonable level, the requirement that CO can be realized under the reservoir pressure is met2Miscible with crude oil, or reservoir pressure not lower than CO280% of the miscible pressure of the crude oil, i.e. in a near miscible state, and moreover, the production of gas-cap gas further causes the gas-oil interface to be lowered, but it is ensured that no gas coning occurs during the production of the subsequent production well;
in CO2Achieving a miscible state with the crude oil, and realizing miscible flooding further comprises:
calculating CO at virgin formation conditions2-crude oil miscible pressure;
calculating the degassed crude oil and CO under different decompression ranges2Comparing the miscible phase pressure with the depressurized reservoir pressure to determine the reservoir pressure reduction range capable of realizing miscible phase or near miscible phase;
when the descending speed of the gas-oil interface is analyzed, the gravity differentiation effect is favorably utilized to fully separate gas from water;
when the height difference between the gas-water interface and the upper perforation of the oil production well is analyzed, no water cone is generated.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109779581A (en) * | 2019-01-17 | 2019-05-21 | 中国石油天然气股份有限公司 | Method for realizing carbon dioxide miscible flooding of high-miscible-phase pressure reservoir |
| CN110541693B (en) * | 2019-08-29 | 2021-09-28 | 中国石油化工股份有限公司 | Low permeability thick sandstone reservoir CO2Driving and drainage composite development method |
| CN111927447B (en) * | 2020-07-09 | 2022-02-01 | 西南石油大学 | Bubble point pressure testing method and device for underground high-pressure water sample |
| CN115935674B (en) * | 2022-12-20 | 2024-03-12 | 中国石油大学(北京) | Based on CO 2 Multiphase zone discrimination method for space-time change characteristics of oil displacement reservoir fluid |
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