Temporary commissioning method for CO2 huff-puff development oil production well

Abstract

The invention discloses a temporary commissioning method for a CO2 huff-puff development oil production well site, which comprises the following steps of: 1, opening a well after well closing is finished and the oil pressure of a wellhead is reduced to 5MPa, discharging produced liquid from oil production wellhead equipment, and adding related chemicals by using a chemical adding unit; produced liquid is conveyed to an electromagnetic heater, and the blowout speed is controlled through an adjustable throttling valve, an electric valve and a pressure transmitter; 2, the produced liquid flows through a filter and a flow meter, is filtered and metered, and then is conveyed to an electric heating oil storage tank; 3, associated gas produced by the electric heating oil storage tank is discharged from an emptying pipeline of the oil storage tank, and chemicals are added through a chemical adding unit before external transportation of the ground process; and 4, the electric heating oil storage tank is transported to a downstream station through a transportation tank car. The invention belongs to the technical field of oil and gas gathering and transportation, and solves the problem that effective metering, collection, storage and transportation are difficult to realize in temporary production storage and transportation in a CO2 huff and puff process in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas gathering and transportation technology, and relates to a method for temporary commissioning of CO2 huff and puff development oil well sites. Background Technology

[0002] Low-permeability reservoirs, influenced by diagenesis, exhibit poor reservoir properties, low permeability, and complex flow patterns. Conventional displacement development methods face significant challenges in effective utilization and are prone to cross-flow of the displacement medium, resulting in low oilfield recovery. CO2 huff and puff technology is an effective enhanced oil recovery technique applicable to both conventional and unconventional reservoirs, widely used in various types of reservoirs, including low-permeability tight, fractured, carbonate, shale, and complex fault blocks. CO2 huff and puff enhances recovery through mechanisms such as reducing crude oil viscosity, improving mobility ratio, reducing oil-water interfacial tension, and increasing crude oil volume. CO2 huff and puff has a promising future for enhanced oil recovery. While CO2 huff and puff features high venting pressure, short venting time, and small venting volume, dynamometer card metering is not well-suited for this process. Existing technologies have not made significant progress in temporary production, storage, transportation, and single-well metering within the CO2 huff and puff process.

[0003] Therefore, it is urgent to develop a temporary commissioning method for CO2 huff and puff oil well sites to successfully realize the metering, collection, storage and transportation of produced fluid from CO2 huff and puff oil wells. Summary of the Invention

[0004] The purpose of this invention is to provide a method for temporary commissioning of CO2 huff and puff in oil well sites, which solves the problem that existing technologies are difficult to achieve effective metering, collection, storage and transportation in the temporary commissioning and storage of CO2 huff and puff processes.

[0005] The technical solution adopted in this invention is a temporary commissioning method for CO2 huff and puff development oil well sites, implemented according to the following steps: Step 1: After the well is shut down, the wellhead oil pressure drops to 5MPa and the well is opened. The produced fluid is discharged from the wellhead equipment and the relevant agents are added using the chemical dosing unit. The produced fluid is transported to the electromagnetic heater and the release speed is controlled by the adjustable throttle valve, electric valve and pressure transmitter. Step 2: The extracted fluid flows through a filter and a flow meter, and after filtration and metering, it is transported to an electrically heated oil storage tank. Step 3: The associated gas produced by the electrically heated oil storage tank is discharged from the oil storage tank vent pipeline, and relevant reagents are added using the dosing unit before being transported to the ground process. Step 4: Transport the electrically heated oil storage tank to the downstream station using a tanker truck.

[0006] The beneficial effects of this invention are as follows: With the aim of testing the oil displacement effect of CO2 huff and puff development, the surface system adopts a "surface gas-liquid heating + elevated electric heating oil storage tank + truck transportation" process according to temporary operational needs. High-point gas production is vented locally, controlling the produced fluid release rate and wellhead oil pressure, and implementing pressure anomaly alarms and electric valve interlock shut-off. By introducing electromagnetic heaters and electric heating oil storage tanks, pipeline freezing is prevented. Furthermore, a chemical dosing unit is added before the surface process's external transport, which can prevent the CO2-containing produced fluid from corroding downstream production equipment during normal production, thus accelerating CO2 huff and puff development. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the equipment layout and process flow of the method of the present invention.

[0008] In the diagram, 1. Wellhead equipment; 2. Electromagnetic heater; 3. Adjustable throttle valve; 4. Pressure transmitter; 5. Electric valve; 6. Filter; 7. Electric heating oil storage tank; 8. Oil storage tank venting pipeline; 9. Chemical dosing unit; 10. Flow meter; 11. Transport tanker. Detailed Implementation

[0009] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0010] Reference Figure 1 The equipment involved in the implementation of the method of the present invention includes, in accordance with the flow direction of the produced fluid, an electromagnetic heater 2, an adjustable throttle valve 3, an electric valve 5 and a pressure transmitter 4, a filter 6 and a flow meter 10, an electrically heated oil storage tank 7 and an oil storage tank venting pipeline 8, which are sequentially installed on the outlet pipeline of the oil wellhead equipment 1. The electrically heated oil storage tank 7 is directly transported by a transport tanker truck 11. In addition, both the oil wellhead equipment 1 and the electrically heated oil storage tank 7 are equipped with injection ports of a chemical dosing unit 9. All components adopt existing technology equipment, and safe and reliable operation is achieved through the control of each component.

[0011] The functions of each device and component are described below: 1) Both the wellhead equipment 1 and the electrically heated oil storage tank 7 are equipped with CO2 gas concentration monitoring instruments, which will alarm when the concentration exceeds the limit (the first alarm limit is 0.25% VOL, and the second alarm limit is 0.5% VOL); at the same time, both the wellhead equipment 1 and the electrically heated oil storage tank 7 are equipped with combustible gas concentration monitoring instruments, which will alarm when the concentration exceeds the limit (the first alarm limit is 20% LEL, and the second alarm limit is 40% LEL).

[0012] After the well is shut down, the wellhead oil pressure drops to 5MPa and the well is opened. The wellhead equipment 1 discharges the produced fluid. When the concentration signals sensed by any two gas concentration monitoring instruments in the well site exceed the level 2 alarm limit at the same time, the well site production is immediately shut down and production activities are stopped.

[0013] 2) Electromagnetic heater 2 heats the produced fluid to prevent pipeline freezing. When the produced fluid flows through electromagnetic heater 2 and the pressure gauge on electromagnetic heater 2 shows a reading, the temperature controller controls electromagnetic heater 2 to be energized and heated to produce the fluid; when the temperature of the produced fluid reaches 60°C, electromagnetic heater 2 stops working.

[0014] 3) The function of the adjustable throttle valve 3 is to prevent pipeline icing by controlling the venting speed. During venting, the wellhead oil pressure is controlled at ≤5MPa, and during the oil production stage, the wellhead oil pressure is controlled at ≤3.6MPa. The adjustable throttle valve 3 performs pressure regulation control and delivers the heated produced fluid to the electric valve 5 and pressure transmitter 4 for throttling. For electric valve 5 and pressure transmitter 4, during the venting stage, an alarm is set to sound when the pressure reaches 5MPa, and when the pressure further reaches 5.5MPa, the electric valve on the pipeline is interlocked to shut down, and the oil well pumping unit is shut down. During the oil production stage, an alarm is set to sound when the pressure reaches 3.8MPa, and when the pressure further reaches 4.0MPa, the electric valve on the wellhead equipment is interlocked to shut down, and the oil well pumping unit is shut down.

[0015] 4) Filter 6 and flow meter 10 filter and measure the throttled produced fluid. Flow meter 10 is a three-phase flow meter that simultaneously measures the flow rates of oil, gas, and water. Carbon dioxide huff and puff development is divided into four stages: CO2 backflow, gas-carrying oil production, high-speed oil production, and oil production rate slowdown. The three stages of gas-carrying oil production, high-speed oil production, and oil production rate slowdown are collectively referred to as the oil production stage. In the CO2 backflow stage, gas backflow is dominant, with virtually no crude oil production; the venting velocity is estimated to be 6000~12000 m / s. 3 / d; After the CO2 backflow stage ends, the oil production stage begins, with pressure-controlled production. The oil, gas and water production levels and oil production intensity are similar to those of shale oil, with daily oil production below 12 tons. Three-phase metering equipment with specifications of DN100 PN63 is used for measurement. If the pumping station is shut down, crude oil production cannot be measured through the dynamometer chart. Flow meters 10 need to be installed to track and measure the crude oil production of each well in order to evaluate the CO2 throughput effect. 5) The electrically heated oil storage tank 7 temporarily stores the filtered and metered produced fluid. When the produced fluid is released into the electrically heated oil storage tank 7, open the two manholes on the top of the electrically heated oil storage tank 7 to release pressure, and then close the two manholes after releasing pressure. The electrically heated oil storage tank 7 is equipped with a high liquid level audible and visual alarm device, and can interlock to shut off the electric valve and pumping unit of the oil wellhead equipment 1. When the liquid level inside the electrically heated oil storage tank 7 exceeds the high limit (H=2.1m, with the bottom of the tank as 0, the same below) or the low limit (L=0.3m), an alarm will be triggered immediately. The electrically heated oil tank 7 is also equipped with a separate temperature controller and electric heater. When the liquid level in the electrically heated oil tank 7 is higher than the low limit, the temperature controller is activated and the electric heater heats the electrically heated oil tank 7 and maintains the fluid temperature in the electrically heated oil tank 7 at 30°C to prevent the subsequent vehicle transport pipeline from freezing. When the liquid level in the electrically heated oil tank 7 is lower than the low limit, the electric heating is stopped. The volume of the electrically heated oil storage tank 7 is 40m³. 3 ~60m 3 A pipeline for loading crude oil onto trucks has been reserved to meet the needs of subsequent truck transportation.

[0016] 6) Since the blowout produced fluid is a mixture of oil, gas, and water from the oil well, the vent line 8 of the oil storage tank is used to discharge the associated gas dispersed in the electrically heated oil storage tank 7. The outlet of the oil tank vent line 8 is connected to the atmosphere. Under normal circumstances, the pipeline pressure between the outlet of the adjustable throttle valve 3 and the electrically heated oil tank 7 should be less than 0.5 MPa. If the flow rate is large, a higher pressure will also appear after the adjustable throttle valve 3. For safety reasons, the pipeline pressure after the adjustable throttle valve 3 and before the electrically heated oil tank 7 is preset to no more than 6.3 MPa.

[0017] 7) Both the wellhead equipment 1 and the electrically heated oil storage tank 7 have reserved interfaces for the dosing unit 9 to meet the needs of adding relevant reagents (such as corrosion inhibitors and hydrate inhibitors) on site.

[0018] The chemical tank of dosing unit 9 is equipped with a liquid level monitoring instrument. When the liquid level is below the low limit, the corresponding dosing pump will be shut down by interlock. The low liquid level alarm value is set according to the actual on-site operating conditions.

[0019] 8) When the produced fluid stored in the electrically heated oil storage tank 7 is full, it is transported by the transport tanker truck 11 to the downstream station for further processing.

[0020] The above-mentioned equipment has flexible control methods. It can be self-controlled by the matching controller, or a central controller can be set up to achieve coordinated process control of the relevant electrical components.

[0021] The present invention provides a method for temporary commissioning of CO2 huff and puff production well sites, which, based on the aforementioned equipment and its layout, is implemented according to the following steps: Step 1: After the well is shut down, the wellhead oil pressure drops to 5 MPa before the well is opened. The produced fluid is discharged from the wellhead equipment 1, and relevant chemicals are added using the chemical dosing unit 9. The produced fluid is then transported to the electromagnetic heater 2 for heating to prevent pipeline freezing. A reasonable flow rate is controlled by the adjustable throttle valve 3, the electric valve 5, and the pressure transmitter 4. During the initial self-flowing stage of production, the wellhead oil pressure is controlled at ≤5 MPa. At the same time, the electric valve 5 and the pressure transmitter 4 are set to alarm and interlock to shut off the electric valve when the pressure reaches 5 MPa and 5.5 MPa, respectively. During the oil production stage, the wellhead oil pressure is controlled at ≤3.6 MPa, and the alarm pressure and shutdown pressure are set to 3.8 MPa and 4.0 MPa, respectively. Step 2: The produced fluid flows through filter 6 and flow meter 10, and after filtration and metering, it is transported to the electrically heated oil storage tank 7; the predicted peak production rate of the well is 6~10m³. 3 / d, the electrically heated oil storage tank 7 is designed for 2 to 7 days. Calculations show that the volume of the electrically heated oil storage tank 7 is 40m³ when storing for 2 days. 3 Therefore, it is preferable to install one 40m... 3 ~60m 3 The electrically heated oil storage tank 7 has a capacity sufficient for 2 days of storage. The exterior of the electrically heated oil storage tank 7 is wrapped with insulation material and equipped with an electric heater; the electrically heated oil storage tank 7 is equipped with a high liquid level audible and visual alarm device, which can interlock and shut down the electric valves and pumping units in the oil wellhead equipment; Step 3: The associated gas produced from the electrically heated oil storage tank 7 is discharged through the tank venting pipeline 8. To prevent the CO2-containing produced fluid from corroding downstream production equipment during normal production, a slow-release and scale inhibitor is added using the dosing unit 9 before the surface process is exported. The dosing unit 9 uses a dual-tank, dual-pump system, with each tank having a volume of 0.5 m³. 3 Each dosing pump is a plunger metering pump with a pressure not exceeding 6.3 MPa and a flow rate range of 50~60 L / h; Step 4: Use transport tanker truck 11 to transport the electrically heated oil storage tank 7 to the downstream station.

[0022] Example 1 Taking the produced fluid from a 5MPa wellhead as an example, the simplified process of this Example 1 is as follows: Step 1: After the well is shut down, the wellhead oil pressure drops to 5 MPa before the well is opened. The produced fluid is discharged from the wellhead equipment 1, and relevant chemicals are added using the chemical dosing unit 9. The produced fluid is then transported to the electromagnetic heater 2 for heating to prevent pipeline freezing. A reasonable flow rate is controlled by the adjustable throttle valve 3, the electric valve 5, and the pressure transmitter 4. During the initial self-flowing stage of production, the wellhead oil pressure is controlled at ≤5 MPa. At the same time, the electric valve 5 and the pressure transmitter 4 are set to alarm and interlock to shut off the electric valve when the pressure reaches 5 MPa and 5.5 MPa, respectively. During the oil production stage, the wellhead oil pressure is controlled at ≤3.6 MPa, and the alarm pressure and shutdown pressure are set to 3.8 MPa and 4.0 MPa, respectively. Step 2: The produced fluid flows through filter 6 and flow meter 10, and after filtration and metering, it is transported to the electrically heated oil storage tank 7; the predicted peak production rate of the well is 6m³. 3 / d, the electric heating oil storage tank is considered to last for 2 days, therefore one 40m³ tank is installed. 3 The electrically heated oil storage tank 7 has a capacity sufficient for 2 days of storage. The exterior of the electrically heated oil storage tank 7 is wrapped with thermal insulation material and equipped with a 25kW electric heater. The electrically heated oil storage tank 7 is equipped with a high liquid level audible and visual alarm device, which can interlock and shut down the electric valves and pumping units in the oil wellhead equipment. Step 3: The associated gas produced is discharged from the oil storage tank vent line 8. To prevent the CO2-containing produced fluid from corroding downstream production equipment during normal production, a slow-release and scale inhibitor is added using the dosing unit 9 before the surface process is exported. The dosing unit 9 uses a dual-tank, dual-pump system, with each tank having a volume of 0.5 m³. 3 Each dosing pump is a plunger metering pump with a pressure not exceeding 6.3 MPa and a flow rate range of 50 L / h. Step 4: Use transport tanker truck 11 to transport the electrically heated oil storage tank 7 to the downstream station.

[0023] Example 2 Taking the produced fluid from a 5MPa wellhead as an example, the simplified process of this Example 2 is as follows: Step 1: After the well is shut down, the wellhead oil pressure drops to 5 MPa before the well is opened. The produced fluid is discharged from the wellhead equipment 1, and relevant chemicals are added using the chemical dosing unit 9. The produced fluid is then transported to the electromagnetic heater 2 for heating to prevent pipeline freezing. A reasonable flow rate is controlled by the adjustable throttle valve 3, the electric valve 5, and the pressure transmitter 4. During the initial self-flowing stage of production, the wellhead oil pressure is controlled at ≤5 MPa. At the same time, the electric valve 5 and the pressure transmitter 4 are set to alarm and interlock to shut off the electric valve when the pressure reaches 5 MPa and 5.5 MPa, respectively. During the oil production stage, the wellhead oil pressure is controlled at ≤3.6 MPa, and the alarm pressure and shutdown pressure are set to 3.8 MPa and 4.0 MPa, respectively. Step 2: The produced fluid flows through filter 6 and flow meter 10, and after filtration and metering, it is transported to the electrically heated oil storage tank 7; the predicted peak production rate of the well is 10m³. 3 / d, the electric heating oil storage tank is considered for 6 days, and a 60m³ capacity is set according to calculations. 3 The electrically heated oil storage tank 7 has a capacity sufficient for 6 days of storage. The exterior of the electrically heated oil storage tank 7 is wrapped with insulation material and equipped with a 25kW electric heater (or electromagnetic heater). The electrically heated oil storage tank 7 is equipped with a high-level audible and visual alarm device, which can interlock and shut down the electric valves and pumping units in the wellhead equipment. Step 3: The associated gas produced is discharged from the oil storage tank vent line 8. To prevent the CO2-containing produced fluid from corroding downstream production equipment during normal production, a slow-release and scale inhibitor is added using the dosing unit 9 before the surface process is exported. The dosing unit 9 uses a dual-tank, dual-pump system, with each tank having a volume of 0.5 m³. 3 Each dosing pump is a plunger metering pump with a pressure not exceeding 6.3 MPa and a flow rate range of 60 L / h. Step 4: Use transport tanker truck 11 to transport the electrically heated oil storage tank 7 to the downstream station.

[0024] Example 3 Taking the produced fluid from a 5MPa wellhead as an example, the simplified process of this Example 3 is as follows: Step 1: After the well is shut down, the wellhead oil pressure drops to 5 MPa before the well is opened. The produced fluid is discharged from the wellhead equipment 1, and relevant chemicals are added using the chemical dosing unit 9. The produced fluid is then transported to the electromagnetic heater 2 for heating to prevent pipeline freezing. A reasonable flow rate is controlled by the adjustable throttle valve 3, the electric valve 5, and the pressure transmitter 4. During the initial self-flowing stage of production, the wellhead oil pressure is controlled at ≤5 MPa. At the same time, the electric valve 5 and the pressure transmitter 4 are set to alarm and interlock to shut off the electric valve when the pressure reaches 5 MPa and 5.5 MPa, respectively. During the oil production stage, the wellhead oil pressure is controlled at ≤3.6 MPa, and the alarm pressure and shutdown pressure are set to 3.8 MPa and 4.0 MPa, respectively. Step 2: The produced fluid flows through filter 6 and flow meter 10, and after filtration and metering, it is transported to the electrically heated oil storage tank 7; the predicted peak production volume of the well is 8m³. 3 / d, the electric heating oil storage tank is considered to last for 7 days, and one 60m³ tank is installed. 3 The electrically heated oil storage tank 7 has a capacity sufficient for 7 days of storage. The exterior of the electrically heated oil storage tank 7 is wrapped with insulation material and equipped with a 25kW electric heater. The electrically heated oil storage tank 7 is equipped with a high liquid level audible and visual alarm device, which can interlock and shut down the electric valves and pumping units in the oil wellhead equipment. Step 3: The associated gas produced is discharged from the oil storage tank vent line 8. To prevent the CO2-containing produced fluid from corroding downstream production equipment during normal production, a slow-release and scale inhibitor is added using the dosing unit 9 before the surface process is exported. The dosing unit 9 uses a dual-tank, dual-pump system, with each tank having a volume of 0.5 m³. 3 Each dosing pump is a plunger-type metering pump with a pressure not exceeding 6.3 MPa and a flow rate range of 55 L / h. Step 4: Use transport tanker truck 11 to transport the electrically heated oil storage tank 7 to the downstream station.

[0025] Example 4 Taking the produced fluid from a 5MPa wellhead as an example, the simplified process of this Example 4 is as follows: Step 1: After the well is shut down, the wellhead oil pressure drops to 5 MPa before the well is opened. The produced fluid is discharged from the wellhead equipment 1, and relevant chemicals are added using the chemical dosing unit 9. The produced fluid is then transported to the electromagnetic heater 2 for heating to prevent pipeline freezing. A reasonable flow rate is controlled by the adjustable throttle valve 3, the electric valve 5, and the pressure transmitter 4. During the initial self-flowing stage of production, the wellhead oil pressure is controlled at ≤5 MPa. At the same time, the electric valve 5 and the pressure transmitter 4 are set to alarm and interlock to shut off the electric valve when the pressure reaches 5 MPa and 5.5 MPa, respectively. During the oil production stage, the wellhead oil pressure is controlled at ≤3.6 MPa, and the alarm pressure and shutdown pressure are set to 3.8 MPa and 4.0 MPa, respectively. Step 2: The produced fluid flows through filter 6 and flow meter 10, and after filtration and metering, it is transported to the electrically heated oil storage tank 7; the predicted peak production volume of the well is 7m³. 3 / d, considering 4 days, set 40m 3 The electrically heated oil storage tank 7 has a capacity sufficient for 4 days of storage. The exterior of the electrically heated oil storage tank 7 is wrapped with insulation material and equipped with a 25kW electromagnetic heater. The electrically heated oil storage tank 7 is equipped with a high-level audible and visual alarm device, which can interlock and shut down the electric valves and pumping units in the wellhead equipment. Step 3: The associated gas produced is discharged from the oil storage tank vent line 8. To prevent the CO2-containing produced fluid from corroding downstream production equipment during normal production, a slow-release and scale inhibitor is added using the dosing unit 9 before the surface process is exported. The dosing unit 9 uses a dual-tank, dual-pump system, with each tank having a volume of 0.5 m³. 3 Each dosing pump is a plunger-type metering pump with a pressure not exceeding 6.3 MPa and a flow rate range of 55 L / h. Step 4: Use transport tanker truck 11 to transport the electrically heated oil storage tank 7 to the downstream station.

Claims

1. A method for temporary commissioning of CO2 huff and puff oil well sites, characterized in that, Follow these steps: Step 1: After the well is shut down, the wellhead oil pressure drops to 5MPa and the well is opened. The produced fluid is discharged from the wellhead equipment (1) and the relevant agents are added using the dosing unit (9). The produced fluid is transported to the electromagnetic heater (2) and the release speed is controlled by the adjustable throttle valve (3), electric valve (5) and pressure transmitter (4). Step 2: The extracted fluid flows through the filter (6) and the flow meter (10) to complete filtration and metering, and then is transported to the electrically heated oil storage tank (7). Step 3: The associated gas produced by the electrically heated oil storage tank (7) is discharged from the oil storage tank venting pipeline (8), and relevant agents are added using the dosing unit (9) before being transported out of the ground process. Step 4: Transport the electrically heated oil storage tank (7) to the downstream station using a transport tanker truck (11).

2. The method for temporary commissioning of CO2 huff and puff development oil well sites according to claim 1, characterized in that: In step 1, when the pressure gauge of the electromagnetic heater (2) shows a reading, the temperature controller controls the electromagnetic heater (2) to be powered on and heat the extracted fluid; when the temperature of the extracted fluid reaches 60°C, the electromagnetic heater (2) stops working.

3. The method for temporary commissioning of CO2 huff and puff development oil well sites according to claim 1, characterized in that: In step 1, during the initial self-flowing stage of production, the wellhead oil pressure is controlled at ≤5MPa, and an electric valve (5) and a pressure transmitter (4) are installed to alarm and interlock to shut off the electric valve when the pressure reaches 5MPa and 5.5MPa, respectively. During the oil production stage, the wellhead oil pressure is controlled at ≤3.6MPa, and the alarm pressure and shutdown pressure are set to 3.8MPa and 4.0MPa, respectively.

4. The method for temporary commissioning of CO2 huff and puff development oil well sites according to claim 1, characterized in that: In step 2, the predicted peak production rate of the well is 6~10m³. 3 / d, the electric heating oil storage tank (7) is designed for a storage capacity of 2 to 7 days, and the volume of the electric heating oil storage tank (7) is 40m³. 3 ~60m 3 .

5. The method for temporary commissioning of CO2 huff and puff development oil well sites according to claim 4, characterized in that: The electric heating oil storage tank (7) is wrapped with insulation material and equipped with an electric heater; the electric heating oil storage tank (7) is equipped with a high liquid level audible and visual alarm device.

6. The method for temporary commissioning of CO2 huff and puff development oil well sites according to claim 4, characterized in that: The pipeline pressure after the adjustable throttle valve (3) and before the electrically heated oil storage tank (7) is preset to be no more than 6.3 MPa.

7. The method for temporary commissioning of CO2 huff and puff development oil well sites according to claim 1, characterized in that: In step 3, the dosing unit (9) uses a dual-tank, dual-pump system, with each tank having a volume of 0.5 m³. 3 Each dosing pump is a plunger-type metering pump with a pressure not exceeding 6.3 MPa and a flow rate range of 50~60 L / h.

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