CN116927735A - Multi-point oil extraction process and gas injection device for stratum block of oil field - Google Patents

Multi-point oil extraction process and gas injection device for stratum block of oil field Download PDF

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Publication number
CN116927735A
CN116927735A CN202311173293.9A CN202311173293A CN116927735A CN 116927735 A CN116927735 A CN 116927735A CN 202311173293 A CN202311173293 A CN 202311173293A CN 116927735 A CN116927735 A CN 116927735A
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gas
oil
pipeline
heating
point
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CN202311173293.9A
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李栋
陈国平
郭连会
丁勇
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Puyang Donghao Mechanical & Electronic Co ltd
Shaanxi Sirui Tomorrow Intelligent Equipment Co ltd
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Puyang Donghao Mechanical & Electronic Co ltd
Shaanxi Sirui Tomorrow Intelligent Equipment Co ltd
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Priority to CN202311173293.9A priority Critical patent/CN116927735A/en
Publication of CN116927735A publication Critical patent/CN116927735A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/243Combustion in situ

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  • 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)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention relates to the technical field of oil extraction by heating and injection pressure of an oil field stratum block, in particular to a multi-point oil extraction process of the oil field stratum block and an air injection device, wherein the air injection device comprises a diesel engine, an exhaust end of the air injection device is connected with an exhaust gas treatment pipeline, and a buffer tank, a dry separator, a wet separator and a dust filter are sequentially arranged on the exhaust gas treatment pipeline; the air inlet end of the compressor is connected with the wet separator so as to compress the tail gas treated by the wet separator, and the air outlet end of the compressor is connected with a heating pipeline; the heating component is arranged on the heating pipeline and is also connected with a christmas tree at the wellhead of the oil production well through a natural gas pipeline so as to collect natural gas escaping from the christmas tree as a heating source; the gas injection pipeline is connected with the heating assembly and is used for injecting heated tail gas into the Christmas tree to drive oil; the invention effectively solves the technical problems existing in the prior art.

Description

Multi-point oil extraction process and gas injection device for stratum block of oil field
Technical Field
The invention relates to the technical field of oil extraction by heating and injection of oil field stratum blocks, in particular to a multi-point oil extraction process and an air injection device for the oil field stratum blocks.
Background
The thick oil refers to crude oil with higher viscosity and higher density, and has poor development effect by adopting a conventional mode, and a steam huff and puff process is usually adopted. For example, the invention disclosed in patent application publication number CN114352250a is a method for producing oil based on optimizing steam flooding of flue gas components, comprising the steps of: s1: regulating and controlling nitrogen in the flue gas to be more than carbon dioxide; s2: injecting steam and a proportion of flue gas into the formation to form a stable temperature field downhole; s3: injecting a foaming agent solution into the formation while maintaining steam and mixture injection; s4: regulating and controlling carbon dioxide in the flue gas to be more than nitrogen; s5: steam and a proportion two of flue gas are injected into the formation. The oil extraction method provided by the invention realizes the resource utilization of the flue gas, greatly reduces the environmental pollution and the carbon emission, optimizes the proportion of the recovered flue gas, and then injects the recovered flue gas in different displacement stages, thereby effectively reducing the production cost, strengthening the development effect of steam flooding and being widely applicable to common heavy oil reservoirs or super/ultra heavy oil reservoirs developed by utilizing thermal recovery.
However, the above process still has a certain problem in practical application: 1) The steam boiler is often bigger, pipeline transportation is adopted, the distance is longer, in order to avoid heat dissipation in the middle of a transportation path, the steam is often required to be burned to a higher temperature, meanwhile, the pipeline is subjected to heat preservation treatment according to the requirement, and the overall cost is too high; 2) Most of conventional oil extraction equipment is single, a plurality of oil wells lack linkage, a plurality of equipment lack linkage, the whole exploitation efficiency of the oil well is lower, and the working strength of the oil collection tank truck during oil collection is also increased.
Disclosure of Invention
The invention provides a multi-point oil extraction process for an oil field stratum block, which aims to solve the technical problems existing in the oil extraction process in the prior art; the invention also provides a multi-point gas injection device for the stratum block of the oil field.
In order to solve the problems, the technical scheme of the multi-point gas injection device for the oil field stratum block provided by the invention is as follows:
a multi-point gas injection apparatus for an oilfield formation block, comprising a plurality of gas injection apparatuses for use with a multi-point production well, each gas injection apparatus comprising:
the exhaust end of the diesel engine is connected with an exhaust gas treatment pipeline, and a buffer tank, a dry separator, a wet separator, a dust filter and an injection balance regulator are sequentially arranged on the exhaust gas treatment pipeline;
the air inlet end of the compressor is connected with the wet separator so as to compress the tail gas treated by the wet separator, and the air outlet end of the compressor is connected with a heating pipeline;
the heating component is arranged on the heating pipeline and is also connected with a christmas tree at the wellhead of the oil production well through a natural gas pipeline so as to collect natural gas escaping from the christmas tree as a heating source;
and the gas injection pipeline is connected with the heating assembly and is used for injecting heated tail gas into the Christmas tree to drive oil.
Further, the tail gas treatment pipeline comprises a main pipeline connected with the exhaust end of the diesel engine and two branch pipelines connected with the main pipeline, wherein the buffer tank, the dry separator and the wet separator are arranged on the two branch pipelines, and the two wet separators are connected.
Further, one of the two branch pipelines is connected with the air outlet end of the heating component through the air collecting pipe so as to collect and treat the waste gas generated after the natural gas is combusted. The exhaust gas generated after the natural gas is combusted increases the amount of the tail gas received by the compressor, and the amount of the tail gas introduced into the oil production well is also increased, so that the oil displacement effect of the oil production well is further improved.
Further, the gas collecting pipes are directly connected with the buffer tanks on the corresponding branch pipelines.
Further, a smoke control valve is arranged on the gas collecting pipe.
Further, a single flow valve is arranged at the inlet of each wet separator, and a blow-off valve is arranged at the lower end of each wet separator.
Further, the heating component is a water jacket furnace and comprises a combustion furnace for combusting natural gas and a heating coil pipe positioned in the combustion furnace and connected with the heating pipeline and the gas injection pipeline.
In order to solve the problems, the technical scheme of the oil field stratum block multipoint oil extraction process provided by the invention is as follows:
a multi-point oil extraction process for an oil field stratum block comprises the following steps:
s1: correspondingly arranging a plurality of gas injection devices beside a plurality of oil extraction wells containing natural gas according to requirements, and preparing multi-point oil displacement of a plurality of oil extraction well positions;
s2: starting the diesel engine, wherein tail gas generated during the working process reaches the compressor after being filtered by the buffer tank, the dry separator, the wet separator and the dust filter, and the gas processing capacity of the compressor is adjusted to ensure that the number of gas cubes processed per minute can meet the use requirement;
s3, the temperature of the tail gas compressed by the compressor is T1, then the tail gas is introduced into the water jacket furnace through a heating pipeline for heating, the tail gas is heated by using natural gas or an electric heating device in the water jacket furnace as a heat source, the temperature of the tail gas is heated to T2, and the temperature of the T2 is higher than T1;
s4: tail gas heated by a water jacket furnace or an electric heating device enters a christmas tree through a gas injection pipeline to finish oil displacement of the oil production wells, and according to actual needs, the multi-point gas injection device is controlled to drive oil of a plurality of oil production wells to one oil production well or a plurality of directional oil production wells, so that the oil production capacity of the oil production wells is improved;
s5: the exhaust gas generated after the combustion of the natural gas in the water jacket furnace enters the buffer tank through the gas collecting pipe, and the exhaust gas from the diesel engine passes through the buffer tank, the dry separator, the wet separator and the dust filter together, and after the exhaust gas is processed through the compressor, the steps S3 and S4 are repeated.
The multi-point oil extraction process for the stratum block of the oil field has the beneficial effects that: after the tail gas of the diesel engine is subjected to multiple filtration treatment of a buffer tank, a dry separator, a wet separator and a dust filter, the tail gas is compressed by a compressor and then is fed into a heating assembly to be heated so as to form high-temperature tail gas, the high-temperature tail gas is fed into an oil extraction well to finish oil displacement, steam in the prior art is replaced, natural gas escaping from the oil extraction well is used as a heat source to heat the tail gas, a boiler for heating the steam is replaced when the temperature of the tail gas is sufficiently increased, a boiler inconvenient to move is not required to be arranged like the prior art, natural gas carried by the oil extraction well is used as a heat source, after the temperature of the tail gas is increased, the tail gas can be fed into the oil extraction well in time, the use is more convenient, and the heat dissipation is less;
meanwhile, a proper number of oil extraction wells are selected according to actual needs to arrange a corresponding number of gas injection devices, the multi-point gas injection device is controlled to drive oil of a plurality of oil extraction wells to one oil extraction well or to orient a plurality of oil extraction wells, the oil extraction capacity of the oil extraction wells can be effectively improved, the oil receiving capacity of the oil receiving tank truck at one oil extraction well is fully improved, the overall oil extraction efficiency of the oil wells is greatly improved, the working strength of the oil receiving tank truck during oil receiving is reduced, and the oil receiving effect is better;
in conclusion, through the arrangement, the invention effectively solves the technical problems existing in the prior art.
Further, T1 is 65-75 ℃, and T2 is 145-155 ℃.
Further, the number of the multi-point gas injection devices is 3-9, so as to correspond to 3-9 oil recovery wells.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the invention are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a schematic diagram of a multi-point gas injection device for an oilfield formation block provided by the invention;
FIG. 2 is a schematic view of the water jacket furnace of FIG. 1;
fig. 3 is a flow chart of the multi-point oil extraction process of the oil field stratum block provided by the invention.
Reference numerals illustrate:
1. a diesel engine; 2. a tail gas treatment pipeline; 201. a main pipeline; 202. dividing pipelines; 3. a buffer tank; 4. a dry separator; 5. a wet separator; 6. a compressor; 7. a heating pipeline; 8. a natural gas pipeline; 9. a tree; 10. an air injection pipeline; 11. a smoke control valve; 12. a single flow valve; 13. a blow-off valve; 14. a water jacket furnace; 15. a combustion furnace; 16. a heating coil; 17. a burner; 18. a fire tube; 19. a gas collection tube; 20. an inlet valve; 21. an outlet valve; 22. a thermometer; 23. a pressure gauge; 24. a crude oil heating line; 25. a partition board.
Detailed Description
The following description of the embodiments of the present invention will be made more complete and clear to those skilled in the art by reference to the figures of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The main concept of the invention is to use the tail gas generated by diesel engine oil and the exhaust gas generated by natural gas combustion to raise temperature to be used as the oil displacement gas to replace the steam in the prior art, and simultaneously, the natural gas is used as the heating source to raise temperature to replace the boiler, and the gas is directly injected into the oil extraction well after being heated at the side of the oil extraction well, so that the invention is more convenient to use and has less heat dissipation; secondly, a proper number of oil extraction wells are selected according to actual needs to arrange a corresponding number of gas injection devices, the multi-point gas injection devices are controlled to drive oil of a plurality of oil extraction wells to one oil extraction well or to orient a plurality of oil extraction wells, the oil extraction capacity of the oil extraction wells can be effectively improved, the oil collection capacity of an oil collection tank truck at one oil extraction well is fully improved, and the overall oil extraction efficiency of the oil wells is greatly improved.
Having described the basic principles of the present invention, various non-limiting embodiments of the invention are described in detail below. Any number of elements in the figures are for illustration and not limitation, and any naming is used for distinction only and not for any limiting sense.
The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments thereof.
Example 1 of the multi-point gas injection device for an oilfield stratum block provided by the invention:
as shown in fig. 1 and 2, the multi-point gas injection device for the oil stratum block comprises a plurality of gas injection devices used in cooperation with a multi-point oil extraction well, and it should be noted that the oil extraction well to which each gas injection device is applicable is an oil extraction well containing natural gas.
The respective gas injection devices are described below. Each gas injection device comprises a diesel engine 1, a compressor 6, a heating component and a gas injection pipeline 10, wherein the exhaust end of the diesel engine 1 is connected with a tail gas treatment pipeline 2, a buffer tank 3, a dry separator 4, a wet separator 5, a dust filter and a pressure injection balance regulator are sequentially installed on the tail gas treatment pipeline 2, and the gas inlet end of the compressor 6 is connected with the wet separator 5 to compress tail gas treated by the wet separator 5.
The gas outlet end of the compressor 6 is connected with a heating pipeline 7, the heating component is arranged on the heating pipeline 7, the heating component is also connected with a christmas tree 9 at the wellhead of the oil production well through a natural gas pipeline 8, natural gas escaping from the christmas tree 9 is collected as a heating source, and a gas injection pipeline 10 is connected with the heating component and used for injecting heated tail gas into the christmas tree 9 for oil displacement.
After the tail gas of the diesel engine 1 is subjected to multiple filtration treatment of the buffer tank 3, the dry separator 4, the wet separator 5 and the dust filter, the tail gas is compressed by the compressor 6 and then is fed into the heating assembly to be heated so as to form high-temperature tail gas, the high-temperature tail gas is fed into the oil extraction well to finish oil displacement, steam in the prior art is replaced, natural gas escaping from the oil extraction well is used as a heat source to heat the tail gas, the temperature of the tail gas is fully improved, a boiler for heating the steam is replaced, the boiler which is inconvenient to move is not required to be arranged like the prior art, natural gas in the oil extraction well is used as a heat source, and after the temperature of the tail gas is improved, the tail gas can be fed into the oil extraction well in time, so that the use is more convenient, and the heat dissipation is less.
Meanwhile, a proper number of oil extraction wells are selected according to actual needs to arrange a corresponding number of gas injection devices, the multi-point gas injection devices are controlled to drive oil of a plurality of oil extraction wells to one oil extraction well or to orient a plurality of oil extraction wells, the oil production capacity of the oil extraction wells can be effectively improved, the oil recovery capacity of an oil recovery tank truck at one oil extraction well is fully improved, the overall oil recovery efficiency of the oil wells is greatly improved, the working strength of the oil recovery tank truck during oil recovery is reduced, and the oil recovery effect is better.
With respect to the exhaust gas treatment line 2. The tail gas treatment pipeline 2 comprises a main pipeline 201 connected with the exhaust end of the diesel engine 1, and two branch pipelines 202 connected with the main pipeline 201, wherein a buffer tank 3, a dry separator 4 and a wet separator 5 are arranged on the two branch pipelines 202, and the two wet separators 5 are connected.
Specifically, one of the two branch pipes 202 is connected to the air outlet end of the heating assembly through a gas collecting pipe 19, so as to collect and treat the exhaust gas generated after the natural gas is combusted. The exhaust gas generated after the natural gas is combusted increases the exhaust gas amount received by the compressor 6, and the exhaust gas amount introduced into the oil production well is also increased, so that the oil displacement effect of the oil production well is further improved.
The gas collection pipe 19 is directly connected to the buffer tank 3 on the corresponding branch pipe 202. When the smoke control valve 11 is specifically arranged on the gas collecting pipe 19.
Furthermore, a single flow valve 12 is arranged at the inlet of each wet separator 5, and a blow-down valve 13 is arranged at the lower end of each wet separator 5.
With respect to the heating assembly. The heating component is a water jacket furnace 14, which comprises a combustion furnace 15 for combusting natural gas, and a heating coil 16 which is positioned in the combustion furnace 15 and is connected with a heating pipeline 7 and a gas injection pipeline 10, wherein the combustion furnace 15 is internally provided with a burner 17 and a fire tube 18 connected with the burner 17, the heating coil 16 is also provided with an inlet valve 20, an outlet valve 21, a thermometer 22 and a pressure gauge 23, and the water jacket furnace 14 is also internally provided with a crude oil heating pipeline 24 which is separated from the heating coil 16 by a partition 25.
Example 2 of the multi-point gas injection device for an oilfield stratum block provided by the invention:
the differences from example 1 are mainly that:
in example 1, the gas collection pipes were directly connected to the buffer tanks on the corresponding branch pipes.
In this embodiment, the gas collection pipe is connected to the corresponding branch pipe, and the buffer tank is not directly connected.
Example 3 of the multi-point gas injection device for an oilfield stratum block provided by the invention:
the differences from example 1 are mainly that:
in example 1, heating was performed using natural gas passing through a jacket furnace as a heat source.
In the present embodiment, the heating may be performed by using an electric heating device as a heat source.
Example 1 of the oilfield formation block multipoint oil extraction process provided by the invention:
as shown in fig. 3, a multi-point oil extraction process for an oil field stratum block comprises the following steps:
s1: correspondingly arranging a plurality of gas injection devices beside a plurality of oil extraction wells containing natural gas according to requirements, and preparing multi-point oil displacement of a plurality of oil extraction well positions;
s2: starting the diesel engine 1, wherein tail gas generated during operation of the diesel engine reaches the compressor 6 after being filtered by the buffer tank 3, the dry separator 4, the wet separator 5 and the dust filter, and the gas processing capacity of the compressor 6 is adjusted to ensure that the number of gas cubes processed per minute can meet the use requirement;
s3, the temperature of the tail gas compressed by the compressor 6 is T1, and then the tail gas is introduced into the water jacket furnace 14 through the heating pipeline 7 for heating, and the natural gas passing through the water jacket furnace 14 is used as a heat source for heating, so that the temperature of the tail gas is heated to T2, and the temperature of the T2 is higher than T1;
s4: tail gas which passes through the water jacket furnace heating or electric heating device enters the christmas tree 9 through the gas injection pipeline 10 to finish oil displacement of the oil production wells, and according to actual needs, the multi-point gas injection device is controlled to drive oil of a plurality of oil production wells to one oil production well or directional multi-port oil production wells, so that the oil production capacity of the oil production wells at the positions is improved;
s5: the exhaust gas generated after the combustion of the natural gas in the water jacket furnace 14 enters the buffer tank 3 through the gas collecting pipe 19, passes through the buffer tank 3, the dry separator 4, the wet separator 5 and the dust filter together with the exhaust gas from the diesel engine 1, and after being processed through the compressor 6, repeats the above steps S3 and S4.
Specifically, T1 is 65-75 ℃, T2 is 145-155 ℃, and the number of the multi-point gas injection devices is 3-9 so as to correspond to 3-9 oil recovery wells.
From the foregoing description of the present specification, it will be further understood by those skilled in the art that terms such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate an azimuth or a positional relationship, are based on the azimuth or the positional relationship shown in the drawings of the present specification, are for convenience only in explaining aspects of the present invention and simplifying the description, and do not explicitly or implicitly refer to devices or elements having to have the specific azimuth, be constructed and operate in the specific azimuth, and thus the azimuth or positional relationship terms described above should not be interpreted or construed as limitations of aspects of the present invention.
In addition, in the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless specifically defined otherwise.

Claims (10)

1. A multi-point gas injection apparatus for an oilfield formation block comprising a plurality of gas injection apparatuses for use with a multi-point production well, each gas injection apparatus comprising:
the exhaust end of the diesel engine is connected with an exhaust gas treatment pipeline, and a buffer tank, a dry separator, a wet separator, a dust filter and an injection balance regulator are sequentially arranged on the exhaust gas treatment pipeline;
the air inlet end of the compressor is connected with the wet separator so as to compress the tail gas treated by the wet separator, and the air outlet end of the compressor is connected with a heating pipeline;
the heating component is arranged on the heating pipeline and is also connected with a christmas tree at the wellhead of the oil production well through a natural gas pipeline so as to collect natural gas escaping from the christmas tree as a heating source;
and the gas injection pipeline is connected with the heating assembly and is used for injecting heated tail gas into the Christmas tree to drive oil.
2. The oilfield formation block multi-point gas injection apparatus of claim 1, wherein: the tail gas treatment pipeline comprises a main pipeline connected with the exhaust end of the diesel engine and two branch pipelines connected with the main pipeline, wherein the buffer tank, the dry separator and the wet separator are respectively installed on the two branch pipelines, and the two wet separators are connected.
3. The oilfield formation block multi-point gas injection apparatus of claim 2, wherein: one of the two branch pipelines is connected with the air outlet end of the heating component through an air collecting pipe so as to collect and treat waste gas generated after the natural gas is combusted.
4. The oilfield formation block multi-point gas injection apparatus of claim 3, wherein: the gas collecting pipes are directly connected with the buffer tanks on the corresponding branch pipelines.
5. The oilfield formation block multi-point gas injection apparatus of claim 3 or 4, wherein: and a smoke control valve is arranged on the gas collecting pipe.
6. The oilfield formation block multi-point gas injection apparatus of any one of claims 2-4, wherein: and a single-flow valve is arranged at the inlet of each wet separator, and a blow-off valve is arranged at the lower end of each wet separator.
7. The oilfield formation block multi-point gas injection apparatus of any one of claims 1-4, wherein: the heating component is a water jacket furnace and comprises a combustion furnace for combusting natural gas and a heating coil pipe which is positioned in the combustion furnace and is connected with the heating pipeline and the gas injection pipeline.
8. The multi-point oil extraction process for the stratum block of the oil field is characterized by comprising the following steps of:
s1: correspondingly arranging a plurality of oil field stratum block multipoint gas injection devices according to requirements at the sides of a plurality of oil extraction wells containing natural gas, and preparing multipoint oil displacement of a plurality of oil extraction well positions;
s2: starting a diesel engine, wherein tail gas generated during operation of the diesel engine reaches a compressor after being filtered by a buffer tank, a dry separator and a wet separator, and the gas processing capacity of the compressor is adjusted to ensure that the number of gas cubes processed per minute can meet the use requirement;
s3: the temperature of the tail gas compressed by the compressor is T1, and then the tail gas is introduced into the water jacket furnace through a heating pipeline for heating, and the tail gas is heated to T2 by using natural gas or an electric heating device in the water jacket furnace as a heat source, wherein the temperature of the tail gas is higher than T1;
s4: tail gas heated by a water jacket furnace or an electric heating device enters a christmas tree through a gas injection pipeline to finish oil displacement of the oil production wells, and according to actual needs, the multi-point gas injection device of the stratum block of the oil field is controlled to drive oil of a plurality of oil production wells to one oil production well or a plurality of directional oil production wells, so that the oil production capacity of the oil production wells at the positions is improved;
s5: the exhaust gas generated after the combustion of the natural gas in the water jacket furnace enters the buffer tank through the gas collecting pipe, and is processed by the buffer tank, the dry separator and the wet separator together with the tail gas from the diesel engine, and after being processed by the compressor, the steps S3 and S4 are repeated.
9. The oilfield formation block multi-point oil extraction process of claim 8, wherein: t1 is 65-75 ℃, and T2 is 145-155 ℃.
10. The oilfield formation block multi-point oil extraction process of claim 8, wherein: the number of the multi-point gas injection devices of the stratum block of the oil field is 3-9 so as to correspond to 3-9 oil recovery wells.
CN202311173293.9A 2023-09-12 2023-09-12 Multi-point oil extraction process and gas injection device for stratum block of oil field Pending CN116927735A (en)

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Application publication date: 20231024