Device for measuring gas quantity and carbon dioxide concentration of oil outlet of crude oil gas drive well

Abstract

The utility model discloses a device for measuring gas quantity and carbon dioxide concentration of an oil outlet of a crude oil gas drive well. The device comprises a gas-liquid separator, a crude oil input pipeline connected with the gas-liquid separator and an oil well outlet pipeline, a safety pressure relief pipeline connected with the gas-liquid separator, a gas conveying pipeline, a liquid conveying pipeline, a main output pipeline connected with the gas conveying pipeline and the liquid conveying pipeline, and a carbon dioxide concentration monitoring pipeline connected with the gas conveying pipeline. According to the utility model, the crude oil input pipeline is in butt joint with the oil well outlet pipeline, petroleum discharged from the oil well driving outlet is fed into the gas-liquid separator, gas contained in the petroleum is separated out, and the gas flow is measured in real time through the flow meter arranged on the gas conveying pipeline, so that the gas content in the petroleum is monitored; in addition, a small amount of gas is collected from the gas conveying pipeline through the carbon dioxide concentration monitoring pipeline to the CO2 concentration instrument, and the CO2 concentration in the gas is monitored in real time through the CO2 concentration instrument.

Description

A device for measuring the gas flow rate and carbon dioxide concentration at the oil outlet of a crude oil gas drive well. Technical Field

[0001] This utility model relates to the field of monitoring technology for oil production processes in gas-driven wells, and in particular to a device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well. Background Technology

[0002] Carbon dioxide flooding (CO2-FLAG) technology involves injecting carbon dioxide into the oil reservoir to improve oil recovery. Currently, with the large-scale development of gas-driven oil recovery, in order to improve the gas-driven oil recovery process and achieve comprehensive control over CO2 concentration data at the wellhead, it is necessary to effectively measure the CO2 concentration at the wellhead of gas-driven oil recovery wells, analyze the gas content and CO2 concentration in the produced oil, and statistically analyze the gas production and CO2 content at the wellhead.

[0003] However, existing technologies lack devices that can be easily connected to the wellhead pipeline of gas-driven oil wells to enable real-time monitoring of the gas content and CO2 concentration in the produced oil. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well, so as to solve the technical problem of connecting with the wellhead pipeline of an existing gas-driven oil well to realize real-time monitoring of the gas content and CO2 concentration in the produced oil.

[0005] This utility model relates to a device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well. The device includes a gas-liquid separator, a crude oil input pipeline connecting the gas-liquid separator to the oil well outlet pipeline, a safety pressure relief pipeline connected to the gas-liquid separator to limit the maximum pressure inside the gas-liquid separator, a gas transmission pipeline connected to the gas-liquid separator to output the separated gas, a liquid transmission pipeline connected to the gas-liquid separator to output the separated liquid, a main output pipeline connected to the gas transmission pipeline and the liquid transmission pipeline to mix and output the gas and liquid, and a carbon dioxide concentration monitoring pipeline connected to the gas transmission pipeline.

[0006] Furthermore, the crude oil input pipeline has a first ball valve for controlling the entry of crude oil.

[0007] Furthermore, the safety relief pipeline has a safety valve connected to the top of the gas-liquid separator and a second ball valve located on the outlet side of the safety valve, and the outlet of the safety relief pipeline is connected to the atmosphere.

[0008] Furthermore, the gas pipeline includes a flow meter, a third ball valve and a fourth ball valve located at the inlet and outlet sides of the flow meter, respectively, a first check valve located at the outlet side of the fourth ball valve, and a fifth ball valve located at the outlet side of the first check valve.

[0009] Furthermore, the infusion line has a sixth ball valve and a second check valve located on the outlet side of the sixth ball valve.

[0010] Furthermore, the main output pipeline has a seventh ball valve.

[0011] Furthermore, the carbon dioxide concentration monitoring pipeline includes a CO2 concentration meter, an eighth ball valve and a pressure reducing valve located on the inlet side of the CO2 concentration meter, and a ninth ball valve located on the outlet side of the CO2 concentration meter. The outlet of the carbon dioxide concentration monitoring pipeline is connected to the atmosphere.

[0012] Furthermore, the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of the crude oil gas-driven well also includes a bottom oil discharge pipeline connecting the bottom of the gas-liquid separator to the main output pipeline, and the bottom oil discharge pipeline has a tenth ball valve.

[0013] Furthermore, the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well also includes a bypass pipeline connecting the well outlet pipeline and the main output pipeline, and the bypass pipeline has an eleventh ball valve.

[0014] The beneficial effects of this utility model are:

[0015] This invention relates to a device for measuring the gas volume and carbon dioxide concentration at the outlet of a crude oil gas-driven well. It connects the crude oil input pipeline to the well outlet pipeline, sending the oil discharged from the well outlet into a gas-liquid separator to separate the gas contained in the oil. A flow meter installed on the gas transmission pipeline measures the gas flow rate in real time, enabling monitoring of the gas content in the oil. Furthermore, a small amount of gas is collected from the gas transmission pipeline through a carbon dioxide concentration monitoring pipeline, depressurized, and then sent to a CO2 concentration meter for real-time monitoring of the CO2 concentration in the gas. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] As shown in the figure, the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well in this embodiment includes a gas-liquid separator 1, a crude oil input pipeline connecting the gas-liquid separator to the oil well outlet pipeline, a safety pressure relief pipeline connected to the gas-liquid separator to limit the maximum pressure inside the gas-liquid separator, a gas transmission pipeline connected to the gas-liquid separator to output the separated gas, a liquid transmission pipeline connected to the gas-liquid separator to output the separated liquid, a main output pipeline connected to the gas transmission pipeline and the liquid transmission pipeline to mix and output the gas and liquid, and a carbon dioxide concentration monitoring pipeline connected to the gas transmission pipeline.

[0019] In this embodiment, the crude oil input pipeline has a first ball valve 2 for controlling the entry of crude oil.

[0020] In this embodiment, the safety relief pipeline has a safety valve 3 connected to the top of the gas-liquid separator and a second ball valve 4 located on the outlet side of the safety valve, and the outlet of the safety relief pipeline is connected to the atmosphere.

[0021] In this embodiment, the gas pipeline includes a flow meter 5, a third ball valve 6 and a fourth ball valve 7 located at the inlet and outlet sides of the flow meter, respectively, a first check valve 8 located at the outlet side of the fourth ball valve, and a fifth ball valve 9 located at the outlet side of the first check valve.

[0022] In this embodiment, the infusion pipeline has a sixth ball valve 10 and a second check valve 11 located on the outlet side of the sixth ball valve.

[0023] In this embodiment, the main output pipeline has a seventh ball valve 12.

[0024] In this embodiment, the carbon dioxide concentration monitoring pipeline has a CO2 concentration meter 13, an eighth ball valve 14 and a pressure reducing valve 15 located on the inlet side of the CO2 concentration meter, and a ninth ball valve 16 located on the outlet side of the CO2 concentration meter. The outlet of the carbon dioxide concentration monitoring pipeline is connected to the atmosphere.

[0025] In this embodiment, the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well connects to the well outlet pipeline via a crude oil input pipeline. The oil discharged from the gas-driven well outlet is fed into a gas-liquid separator, which separates the gases contained within the oil. To ensure the safe operation of the gas-liquid separator, a safety pressure relief pipeline is installed. When the gas pressure inside the gas-liquid separator exceeds the set pressure of the safety valve, the safety valve automatically opens under the pressure of the gas pressure inside the separator, thereby releasing some gas to reduce the pressure inside the gas-liquid separator and ensuring its safe operation.

[0026] In this embodiment, the device for measuring the gas flow rate and carbon dioxide concentration at the oil outlet of a crude oil gas-drive well outputs gas from a gas-liquid distributor via a gas pipeline. A flow meter installed on the gas pipeline measures the gas flow rate in real time, thus monitoring the gas content in the oil. Furthermore, this device collects a small amount of gas from the gas pipeline via a carbon dioxide concentration monitoring pipeline, depressurizes it, and sends it to a CO2 concentration meter, enabling real-time monitoring of the CO2 concentration in the gas.

[0027] In this embodiment, the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-drive well has gas and liquid separated by a gas-liquid separator and then mixed and output in the main output pipeline. The outlet of the main output pipeline is connected to the pipeline to the oil tank. This device can be easily installed between the oil outlet and the oil tank pipeline of a crude oil gas-drive well.

[0028] As an improvement to the above example, the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well further includes a bottom oil discharge pipeline connecting the bottom of the gas-liquid separator to the main output pipeline, wherein the bottom oil discharge pipeline has a tenth ball valve 17. By setting up the bottom oil discharge pipeline, it is possible to avoid the accumulation of dirt at the bottom of the gas-liquid separator.

[0029] As an improvement to the above example, the device for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well further includes a bypass pipeline connecting the well outlet pipeline and the main output pipeline, wherein the bypass pipeline has an eleventh ball valve 18. During maintenance and repair of this device, the oil discharged from the well can be output to the oil tank pipeline through the bypass pipeline without affecting oil production operations.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for measuring the gas flow rate and carbon dioxide concentration at the oil outlet of a crude oil gas-driven well, characterized in that: It includes a gas-liquid separator, a crude oil input pipeline connecting the gas-liquid separator to the oil well outlet pipeline, a safety pressure relief pipeline connected to the gas-liquid separator to limit the maximum pressure inside the gas-liquid separator, a gas transmission pipeline connected to the gas-liquid separator to output the separated gas, a liquid transmission pipeline connected to the gas-liquid separator to output the separated liquid, a main output pipeline connected to the gas transmission pipeline and the liquid transmission pipeline to mix and output the gas and liquid, and a carbon dioxide concentration monitoring pipeline connected to the gas transmission pipeline.

2. The device for measuring the gas production rate and the carbon dioxide concentration at the outlet of a gas-drive well for crude oil according to claim 1, characterized in that: The crude oil input pipeline has a first ball valve for controlling the inflow of crude oil.

3. The apparatus for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-drive well according to claim 1, characterized in that: The safety relief pipeline has a safety valve connected to the top of the gas-liquid separator and a second ball valve located on the outlet side of the safety valve. The outlet of the safety relief pipeline is connected to the atmosphere.

4. The apparatus for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas drive well according to claim 1, characterized in that: The gas pipeline has a flow meter, a third ball valve and a fourth ball valve located at the inlet and outlet of the flow meter, a first check valve located at the outlet of the fourth ball valve, and a fifth ball valve located at the outlet of the first check valve.

5. The apparatus for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-drive well according to claim 1, characterized in that: The infusion line has a sixth ball valve and a second check valve located on the outlet side of the sixth ball valve.

6. The apparatus for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-drive well according to claim 1, characterized in that: The main output pipeline has a seventh ball valve.

7. The apparatus for measuring the gas volume and carbon dioxide concentration at the oil outlet of a crude oil gas-drive well according to claim 1, characterized in that: The carbon dioxide concentration monitoring pipeline has a CO2 concentration meter, an eighth ball valve and a pressure reducing valve located on the inlet side of the CO2 concentration meter, and a ninth ball valve located on the outlet side of the CO2 concentration meter. The outlet of the carbon dioxide concentration monitoring pipeline is connected to the atmosphere.

8. The apparatus for measuring the gas rate and carbon dioxide concentration at the production mouth of a gas-drive well for crude oil according to claim 1, characterized in that: It also includes a bottom oil discharge pipeline connecting the bottom of the gas-liquid separator to the main output pipeline, and the bottom oil discharge pipeline has a tenth ball valve.

9. The apparatus for measuring the gas rate and carbon dioxide concentration at the production mouth of a gas-drive well for crude oil according to claim 1, characterized in that: It also includes a bypass pipeline connecting the well outlet pipeline and the main output pipeline, wherein the bypass pipeline has an eleventh ball valve.

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