CN114370259A - Offshore low-yield heavy oil cold production well thermal composite huff and puff synergy system and operation method - Google Patents
Offshore low-yield heavy oil cold production well thermal composite huff and puff synergy system and operation method Download PDFInfo
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- 239000003921 oil Substances 0.000 claims abstract description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 238000002347 injection Methods 0.000 claims abstract description 74
- 239000007924 injection Substances 0.000 claims abstract description 74
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000012747 synergistic agent Substances 0.000 claims abstract description 43
- 239000003814 drug Substances 0.000 claims abstract description 36
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- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 32
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- 238000002791 soaking Methods 0.000 claims description 10
- 241000191291 Abies alba Species 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- -1 alkyl glycoside Chemical class 0.000 claims description 5
- 229930182470 glycoside Natural products 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 150000004996 alkyl benzenes Chemical class 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
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- 230000009471 action Effects 0.000 claims description 3
- 229940092714 benzenesulfonic acid Drugs 0.000 claims description 3
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- 238000011161 development Methods 0.000 description 7
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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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- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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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
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/128—Adaptation of pump systems with down-hole electric drives
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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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a thermal composite huff and puff synergy system for an offshore low-yield heavy oil cold production well, which comprises a wellhead production tree, an electric pump production pipe column, a hot water injection pipeline, a mud tank, a medicament tank and a nitrogen making device, wherein one end of the hot water injection pipeline is connected to an oil pipe wing valve, and the other end of the hot water injection pipeline is connected with platform hot water; the mud tank is internally stored with a composite synergistic agent A and is connected to a hot water injection pipeline through a chemical injection pipeline A; the compound synergistic agent B is stored in the agent tank, and the agent tank is connected to the hot water injection pipeline through an agent injection pipeline B; the nitrogen making device is connected to the sleeve wing valve through a nitrogen injection pipeline. The invention also discloses an operation method of the system, which comprises the following steps: injecting hot water, the composite synergistic agent A, the composite synergistic agent B and nitrogen into an oil reservoir through a crude oil cold production tubular column, and stewing for a period of time after the injection is finished and starting a pump for production. The invention can fully exert the synergistic effect of heat, gas and chemical agents, and improve the oil reservoir exploitation degree of low-yield heavy oil, thereby greatly improving the recovery ratio of the heavy oil.
Description
Technical Field
The invention relates to an offshore heavy oil field thermal recovery development oil extraction process, in particular to an offshore low-yield heavy oil cold production well thermal composite huff and puff synergy system and an operation method thereof.
Background
The thick oil steam huff-puff thermal recovery is characterized in that a certain amount of high-temperature high-pressure steam is continuously injected into one thick oil well in a short period, then the well is stewed for 5-7 days, the steam heat is diffused to a reservoir layer, then a pump is started to start the well for production, when the instantaneous oil recovery amount or the bottom hole flow temperature is reduced to a certain level, the next round of steam injection, stewing and oil extraction is carried out, the high-temperature high-pressure steam is repeatedly injected, and the purpose of improving the recovery ratio of the thick oil reservoir through steam huff-puff is achieved through multiple rounds of periodic circulation.
The offshore common heavy oil field generally adopts a cold production development mode, light components are gradually produced along with the continuous production, heavy components staying in an oil layer can cause the reduction or the blockage of a stratum fluid pore passage, the yield of an oil well is greatly reduced, the production platform of the offshore oil field is limited in area and narrow in space, facilities similar to a boiler, water treatment and the like used for the development of the land heavy oil field are difficult to place on the platform, and in addition, the common production conventional well completion mode of the heavy oil cold production development well, a wellhead production tree, a pipe column and a sand control system are limited in temperature resistance, so that the offshore common heavy oil field is not suitable for implementing high-temperature high-pressure steam huff and puff to improve the recovery rate construction operation.
The thick oil fluid has certain variability in flowing and extracting under the stratum condition, and various single thick oil cold production well yield increasing technologies have short effective period and certain limitations, so how to innovatively develop a low-cost and high-efficiency extraction technology for improving the development effect and increasing the extraction benefit of a low-yield thick oil cold production oil field in the low-cost and labored period of oil price is a difficult problem which needs to be solved by offshore oil development and extraction engineers.
Disclosure of Invention
The invention aims to solve the problem that the existing offshore heavy oil recovery technology has single technology limitation, and provides a thermal composite huff and puff synergy system for an offshore low-yield heavy oil cold recovery well and an operation method thereof, which can realize the purpose of improving the recovery effect of the low-yield cold recovery heavy oil well by a thermal composite synergy technology according to the temperature resistance characteristics of a cold recovery well mouth and a pipe column.
The technical scheme adopted by the invention is as follows: a thermal composite huff and puff synergy system for an offshore low-yield heavy oil cold production well, which comprises a wellhead Christmas tree and an electric pump production pipe column, and further comprises:
one end of the hot water injection pipeline is connected to an oil pipe wing valve of the wellhead Christmas tree, the other end of the hot water injection pipeline is connected with platform hot water, and the platform hot water can be injected into an oil pipe of the electric pump production string through the hot water injection pipeline;
the mud tank is connected to the hot water injection pipeline through a pesticide injection pipeline A, so that the composite synergistic pesticide A can be injected into an oil pipe of the electric pump production pipe column through the oil pipe wing valve;
the medicament tank is internally stored with a composite synergistic medicament B, and is connected to the hot water injection pipeline through a medicament injection pipeline B, so that the composite synergistic medicament B can be mixed with the platform hot water in the hot water injection pipeline and injected into an oil pipe of the electric pump production string through the oil pipe wing valve; and
a nitrogen-producing device connected to a casing wing valve of the wellhead Christmas tree by a nitrogen injection line such that nitrogen produced by the nitrogen-producing device can be injected into an oil casing annulus of the electric pump production string through the casing wing valve.
Furthermore, an injection pump is arranged at one end of the hot water injection pipeline, which is close to the platform hot water.
Further, a platform mud pump is arranged on the medicament injection pipeline A.
Further, a medicament pump is arranged on the medicament injection pipeline B.
Further, the temperature of the platform hot water is 100-115 ℃.
Further, the composite synergistic medicament A comprises one or more of petroleum ether, unsaturated acid ester copolymer and high molecular surfactant; the processing radius of the composite synergistic medicament A is 0.2-0.5 m.
Further, the composite synergistic agent B comprises one or more of alkyl benzene sulfonic acid surfactants, alkyl glycoside surfactants and OP surfactants, and the concentration of the mixed composite synergistic agent B and the platform hot water (3) is 0.8-1.2%.
The other technical scheme adopted by the invention is as follows: the operation method of the offshore low-yield heavy oil cold production well thermal composite huff and puff synergy system comprises the following steps:
injecting nitrogen into an oil sleeve annulus of the electric pump production string through the nitrogen making device, wherein the nitrogen in the oil sleeve annulus is injected into a thick oil layer through the sieve tube;
and 6, putting the Y-plug into the electric pump production pipe column for production operation.
Further, in the step 2, the time of the soaking reaction is 12 to 24 hours.
Further, in the step 5, the soaking time is 24-48 hours.
The invention has the beneficial effects that: the invention provides a brand new process for improving the exploitation effect of a low-yield well for cold exploitation of heavy oil, which can effectively solve the problem of colloid and asphaltene blockage existing in a near-well zone of an oil layer, can fully play the synergistic effect of heat, gas and chemical agents, effectively improve the flow capacity of a heavy oil reservoir, greatly improve the exploitation level of the heavy oil reservoir and the exploitation effect of the low-yield cold-exploitation heavy oil well, and increase the yield of a platform oil well.
Drawings
FIG. 1: the structural schematic diagram of the offshore low-yield heavy oil cold production well thermal composite huff and puff synergistic system is disclosed.
The attached drawings are marked as follows:
1-mud tank; 2-platform slurry pump;
3-platform hot water; 4-injection pump;
5-medicament pot; 6-medicament pump;
7-nitrogen making device; 8-oil pipe wing valve;
9-sleeve wing valve; 10-oil pipe;
11-hot water synergistic slug solution; 12-oil jacket annulus;
13-nitrogen; 14-Y block;
15-casing; 16-thick oil layer;
17-electric submersible pump; 18-hot water injection line;
19-injection line A; 20-injection line B;
21-nitrogen injection line; 22-sieve tube;
and 23-liquid outlet hole.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in the attached drawing 1, the offshore low-yield heavy oil cold production well thermal composite huff and puff synergy system comprises a wellhead Christmas tree and an electric pump production pipe column, wherein an oil pipe wing valve 8 and a sleeve pipe wing valve 9 are installed on the wellhead Christmas tree, the electric pump production pipe column comprises an oil pipe 10, a sleeve pipe 15, a sieve pipe 22, a Y plug 14, an electric submersible pump 17 and the like, oil sleeve annuluses 12 are formed between the oil pipe 10 and the sleeve pipe 15 and between the oil pipe 10 and the sieve pipe 22, and a plurality of liquid outlet holes 23 are formed in the horizontal section of the oil pipe 10 at intervals.
The system also includes a hot water injection line 18, a mud tank 1, a drug injection line a19, a drug injection line B20, a nitrogen generator 7, and a nitrogen injection line 21.
One end of the hot water injection pipeline 18 is connected to the oil pipe wing valve 8, the other end of the hot water injection pipeline is connected with the platform hot water 3, and an injection pump 4 is arranged at one end, close to the platform hot water 3, of the hot water injection pipeline 18. The platform hot water 3 can be injected into the oil pipe 10 of the electric pump production string through the hot water injection line 18. The temperature of the platform hot water 3 is 100-115 ℃, so that the temperature of the hot water synergistic slug solution 11 injected into the oil pipe 10 is 100-115 ℃.
The mud tank 1 is internally stored with a compound synergistic medicament A, the mud tank 1 is connected with a hot water injection pipeline 18 through a medicament injection pipeline A19, and a platform mud pump 2 is arranged on a medicament injection pipeline A19. The composite synergist A can be injected into the oil pipe 10 of an electric pump production string located in a thick oil reservoir 16 through an oil pipe wing valve 8. The composite synergistic medicament A has the main function of eliminating the possible organic blockage problems of colloid asphaltene and the like in the oil reservoir near well. The main component of the composite synergistic agent A is composed of one or more of petroleum ether, unsaturated acid ester copolymer and high molecular surfactant, and the processing radius of the composite synergistic agent A is 0.2 m-0.5 m.
The medicament tank 5 stores the compound synergistic medicament B, the medicament tank 5 is connected to the hot water injection pipeline 18 through a medicament injection pipeline B20, and the medicament pump 6 is arranged on the medicament injection pipeline B20. The compound synergistic agent B can be mixed with the platform hot water 3 in the hot water injection pipeline 18 and injected into the oil pipe 10 of the electric pump production string positioned in the heavy oil reservoir 16 through the oil pipe wing valve 8. The composite synergistic agent B has the main functions of reducing the viscosity of thickened oil, reducing the interfacial tension of oil and water and improving the oil-water fluidity ratio. The main component of the composite synergistic agent B is composed of one or more of alkyl benzene sulfonic acid surfactant, alkyl glycoside surfactant and OP surfactant, and after the composite synergistic agent B is mixed with the platform hot water 3, the concentration of the composite synergistic agent B is 0.8-1.2%.
The nitrogen production device 7 is used for producing high-purity nitrogen gas 13, and the nitrogen production device 7 is connected to a casing wing valve 9 of a wellhead Christmas tree through a nitrogen injection pipeline 21. Nitrogen 13 produced by the nitrogen generator 7 can be injected into the oil casing annulus 12 of the electric pump production string through the casing wing valve 9. The nitrogen 13 is used for inhibiting the water from entering from the edge and the bottom and has the function of insulating the oil sleeve annulus.
The operation method of the offshore low-yield heavy oil cold production well thermal composite huff and puff synergistic system comprises the following steps:
And 2, injecting a composite synergistic agent A into an oil pipe 10 of the electric pump production string through a platform mud pump 2, injecting platform hot water 3 into the oil pipe 10 after the composite synergistic agent A is injected, enabling the composite synergistic agent A in the oil pipe 10 to sequentially pass through a liquid outlet 23 and a horizontal section sieve pipe 22 on the oil pipe 10 under the action of the platform hot water 3 and to be injected into a thick oil layer 16, and carrying out a soaking reaction after the composite synergistic agent A is injected into the thick oil layer 16, wherein the soaking reaction time is 12-24 hours.
And 3, injecting the composite synergistic agent B in the agent tank 5 into a hot water injection pipeline 18 by an agent pump 6, mixing the composite synergistic agent B and the platform hot water 3 in the hot water injection pipeline 18 to form a hot water synergistic slug solution 11, injecting the hot water synergistic slug solution 11 into the oil pipe 10, and injecting the hot water synergistic slug solution 11 in the oil pipe 10 into the heavy oil layer 16 through a liquid outlet hole 23 and a sieve pipe 22 on the oil pipe 10 in sequence.
And 4, injecting nitrogen 13 into the oil casing annulus 12 of the electric pump production string through the nitrogen production device 7, and injecting the nitrogen 13 in the oil casing annulus 12 into the heavy oil layer 16 through a sieve tube 22.
And 5, stewing after the injection of the nitrogen 13 is finished, wherein the stewing time is 24-48 hours.
And 6, putting the Y plug 14, starting the electric submersible pump 17, and carrying out production operation by the electric pump production pipe column.
In the first embodiment of the invention, the composite synergist A adopts a high molecular surfactant, and the processing radius of the high molecular surfactant is 0.2 m; the temperature of the platform hot water 3 is 115 ℃; the compound synergistic agent B is alkylbenzene sulfonic acid surfactant, and the use concentration of the compound synergistic agent B after being mixed with the platform hot water 3 is 0.8%; the soaking time after the injection is 24 hours.
In a second embodiment of the invention, the composite synergist a is in particular petroleum ether, with a treatment radius of 0.4 m; the temperature of the platform hot water 3 is 110 ℃; the composite synergistic agent B consists of alkyl glycoside surfactant and OP surfactant, after the composite synergistic agent B is mixed with the platform hot water 3, the concentration of the alkyl glycoside surfactant is 0.5 percent, and the concentration of the OP surfactant is 0.5 percent; the soaking time after the injection is 48 hours.
In the third embodiment of the invention, the composite synergist A consists of a high molecular surfactant and an unsaturated acid ester copolymer, and the processing radius of the composite synergist A is 0.5 m; the temperature of the platform hot water 3 is 115 ℃; the compound synergistic agent B is OP surfactant, and the use concentration of the compound synergistic agent B after being mixed with the platform hot water 3 is 1.2%; the soaking time after the injection is 30 hours.
The effect of the invention is verified by the following field test examples:
selecting a certain offshore heavy oil cold production well, wherein the oil deposit depth is about 1800 m, the length of a horizontal section is about 300 m, adopting a high-quality sieve tube and gravel filling well completion sand prevention mode, enabling a wellhead Christmas tree and a pipe column to resist the highest temperature of 121 ℃, the viscosity of ground dehydrated crude oil at 50 ℃ to be 4230mPa.s, and the gas-oil ratio in a stable production period to be 3-5 m3/m3Y-tube column production, daily liquid production 19m34.7m of daily oil3It is a low-yield heavy oil cold production well.
Aiming at the contradiction between the geological characteristics of an oil reservoir and the properties and development of ground crude oil, a thermal composite huff and puff synergistic process test of a heavy oil cold production well is developed in 2021 on the basis of early-stage cold production trial production of the heavy oil block.
Designing the dosage of the composite synergist A to be 20m according to the actual geological condition of the oil reservoir and the CMG numerical simulation result3The dosage of the compound synergistic medicament B is 36m3Nitrogen 13 injection 10x104Nm3The specific parameters are as follows:
1) composite synergist A use parameter parameters
The treatment radius is 0.2m, the use concentration is 100 percent, and the total is 20m3。
2) Nitrogen 13 water pressing cone parameter
Oil jacket annular space 12 injection, nitrogen 13 purity 99.9%, injection amount 10x104Nm3。
3) Main slug parameter
Platform hot water 3 injection amount 3000m3The injection temperature is 108 ℃, the composite synergistic medicament B and the platform hot water 3 are injected together continuously, and the dosage of the composite synergistic medicament B is 36m3The use concentration is 1.2%, while the oil jacket annulus 12 is continuously injected with high purity nitrogen 13.
After the invention is implemented, the daily oil yield of the offshore heavy oil cold production well reaches 50m3And d, achieving the purposes of increasing the efficiency and production and effectively using.
In summary, the invention is a synergistic process method of injecting hot water at a certain temperature, a composite synergistic agent (comprising a composite synergistic agent A and a composite synergistic agent B) and nitrogen 13 into a low-yield heavy oil cold production well, stewing for a certain time after injection is finished, and then starting a pump to produce, which can fully play the roles of viscosity reduction and blockage removal of the hot-gas-agent, effectively improve the oil-water fluidity ratio of the heavy oil reservoir, and improve the utilization degree of the heavy oil reservoir, thereby greatly improving the heavy oil recovery ratio of the low-yield cold production heavy oil well, and is a new technology which has wide application prospect in an offshore platform and can greatly improve the production effect and recovery ratio of the low-yield heavy oil cold production well under the current technical background.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. The utility model provides an offshore low yield viscous crude cold production well heat recombination throughput increase system, the system includes well head production tree and electric pump production tubular column, its characterized in that, the system still includes:
a hot water injection pipeline (18), wherein one end of the hot water injection pipeline (18) is connected to an oil pipe wing valve (8) of the wellhead Christmas tree, the other end of the hot water injection pipeline is connected with platform hot water (3), and the platform hot water (3) can be injected into an oil pipe (10) of the electric pump production string through the hot water injection pipeline (18);
the mud tank (1) is internally provided with a composite synergistic agent A, the mud tank (1) is connected to the hot water injection pipeline (18) through a pesticide injection pipeline A (19), so that the composite synergistic agent A can be injected into an oil pipe (10) of the electric pump production string through the oil pipe wing valve (8);
a medicament tank (5), wherein a compound synergistic medicament B is stored in the medicament tank (5), the medicament tank (5) is connected to the hot water injection pipeline (18) through a medicament injection pipeline B (20), so that the compound synergistic medicament B can be mixed with the platform hot water (3) in the hot water injection pipeline (18) and injected into an oil pipe (10) of the electric pump production string through the oil pipe wing valve (8); and
a nitrogen production device (7), the nitrogen production device (7) being connected to a casing wing valve (9) of the wellhead Christmas tree by a nitrogen injection line (21) so that nitrogen (13) produced by the nitrogen production device (7) can be injected into an oil casing annulus (12) of the electric pump production string by the casing wing valve (9).
2. The offshore low-yield heavy oil cold production well thermal composite throughput enhancement system according to claim 1, wherein an injection pump (4) is arranged at one end of the hot water injection pipeline (18) close to the platform hot water (3).
3. The offshore low-yield heavy oil cold production well thermal composite throughput enhancement system according to claim 1, wherein a platform mud pump (2) is arranged on the agent injection pipeline A (19).
4. The offshore low-yield heavy oil cold production well thermal composite throughput synergistic system according to claim 1, wherein a medicament pump (6) is arranged on the medicament injection pipeline B (20).
5. The offshore low-yield heavy oil cold production well thermal composite throughput enhancement system according to claim 1, wherein the temperature of the platform hot water (3) is 100-115 ℃.
6. The offshore low-yield heavy oil cold production well thermal composite huff and puff synergistic system according to claim 1, wherein the composite synergistic agent A comprises one or more of petroleum ether, unsaturated acid ester copolymer and high molecular surfactant; the processing radius of the composite synergistic medicament A is 0.2-0.5 m.
7. The offshore low-yield heavy oil cold production well thermal composite huff and puff synergistic system according to claim 1, wherein the composite synergistic agent B comprises one or more of alkyl benzene sulfonic acid surfactants, alkyl glycoside surfactants and OP surfactants, and the concentration of the mixed composite synergistic agent B and the platform hot water (3) is 0.8-1.2%.
8. An operation method of the offshore low-yield heavy oil cold production well thermal composite throughput enhancement system based on any one of the claims 1 to 7 is characterized by comprising the following steps:
step 1, fishing out a Y plug (14) in the electric pump production pipe column;
step 2, injecting the composite synergistic agent A into an oil pipe (10) of the electric pump production string, injecting platform hot water (3) into the oil pipe (10) for replacement after the composite synergistic agent A is injected, so that the composite synergistic agent A in the oil pipe (10) is injected into a thick oil layer (16) through a liquid outlet hole (23) and a horizontal section sieve tube (22) on the oil pipe (10) in sequence under the action of the platform hot water (3), and carrying out a soaking reaction after the composite synergistic agent A is injected into the thick oil layer (16);
step 3, mixing the composite synergistic agent B and the platform hot water (3) in a hot water injection pipeline (18) to form a hot water synergistic slug solution (11), injecting the hot water synergistic slug solution (11) into the oil pipe (10), and injecting the hot water synergistic slug solution (11) in the oil pipe (10) into a thick oil layer (16) through a liquid outlet hole (23) on the oil pipe (10) and the sieve pipe (22) in sequence;
step 4, injecting nitrogen (13) into an oil casing annulus (12) of the electric pump production string through the nitrogen production device (7), wherein the nitrogen (13) in the oil casing annulus (12) is injected into a thick oil layer (16) through the sieve tube (22);
step 5, stewing is carried out after the injection of the nitrogen (13) is finished;
and 6, putting the Y-shaped plug (14), and carrying out production operation by the electric pump production pipe column.
9. The method according to claim 8, wherein the soaking reaction time in step 2 is 12 to 24 hours.
10. The method of claim 8, wherein the soaking time in step 5 is 24 to 48 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210100542.0A CN114370259A (en) | 2022-01-27 | 2022-01-27 | Offshore low-yield heavy oil cold production well thermal composite huff and puff synergy system and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210100542.0A CN114370259A (en) | 2022-01-27 | 2022-01-27 | Offshore low-yield heavy oil cold production well thermal composite huff and puff synergy system and operation method |
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