Closed oil well oil gas production metering device

Abstract

The utility model relates to the technical field of oil well oil and gas production equipment, in particular to a closed oil well oil and gas production metering device which is reasonable in structure, high in safety, low in cost and capable of effectively treating or recycling associated gas generated in oil exploitation, further improving safety and efficiency of site construction and reducing adverse effects on the environment. The crude oil tank is a closed pressure container, a gas control valve and a gas pressure regulating valve are arranged on the gas pipeline, the gas pressure regulating valve is arranged between the gas control valve and the gas combustion torch / gas collector, a low-pressure connecting pipeline is further arranged, one end of the low-pressure connecting pipeline is connected into the gas pipeline between the gas control valve and the gas pressure regulating valve, and the other end of the low-pressure connecting pipeline is connected into the gas pipeline. The other end is communicated with the crude oil tank.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil well oil and gas production equipment technical field, specifically speaking a structure is reasonable, safety is high, cost is low, can carry out effective treatment or recovery to the associated gas produced in oil exploitation, and then improve the on -the -spot construction safety and efficiency, reduce the adverse effect of the closed type oil well oil and gas production metering device to the environment. BACKGROUND

[0002] In the oil and gas production of oil field, for those scattered, remote and initial development of oil well, especially the newly developed shale oil well, due to not having the condition of large-scale centralized production, often using single well or several wells as a unit small-scale independent oil and gas production system. In this oil well oil and gas production system, the oil-water-gas multiphase flow output by the oil well is input to the three-phase separator through the pipeline and the oil well throttle manifold. The three-phase separator can use the oil-water-gas multiphase flow array type measuring device described in patent document CN115506775A. The three-phase separator is connected with the gas burner or the gas receiving tank, the crude oil recovery tank and the flowback fluid recovery tank through the gas pipeline, the oil pipeline and the water pipeline respectively. Gas control valve, crude oil control valve and free water control valve are respectively arranged on the gas pipeline, the oil pipeline and the water pipeline. The associated gas separated by the three-phase separator is transported to the gas burner for combustion to prevent environmental damage, or is sent to the gas receiving tank for storage. The crude oil separated by the three-phase separator contains a small amount of water and is transported to the crude oil recovery tank for storage before transportation. The free water separated by the three-phase separator is transported to the flowback fluid recovery tank for storage before transportation.

[0003] Because it bears the function of liquid in and out at any time, and also needs to conveniently master the distribution of liquid in the tank, considering technology, cost, convenience and other aspects, the existing crude oil recovery tank and flowback fluid recovery tank are connected with the atmosphere through a breather valve or an observation hole and work in a state of most of the time under normal pressure. Under the normal working condition of the three-phase separator, the liquid in the flowback fluid recovery tank is basically free water, and this working mode has no problem. However, the crude oil recovery tank exchanges associated gas represented by methane with the atmosphere, and the crude oil in the crude oil recovery tank continuously releases new associated gas during heating. In addition to not being able to master the stratified distribution of oil and water in the tank in real time, there are two other problems that cannot be ignored: one is the pollution and damage of methane and other gases to the environment, and the other is the safety problem caused thereby. With the increase of the number of oil wells put into production, these two problems are becoming more and more serious and cannot be ignored. SUMMARY

[0004] The utility model discloses a closed oil well oil and gas production metering device which has the advantages of reasonable structure, high safety, low cost, effective treatment or recovery of associated gas generated in oil exploitation, improved safety and efficiency of on-site oil and gas production and reduced adverse effects on the environment.

[0005] The utility model discloses the following measures to reach:

[0006] A closed oil well oil and gas production metering device is characterized in that a three-phase separator, a flowback fluid recovery tank, a crude oil tank and a gas combustion torch / gas collector are arranged, the oil-water-gas multiphase flow output from the oil well is input into the three-phase separator through a pipeline, the three-phase separator is connected with the gas combustion torch / gas collector through a gas conveying pipeline and connected with the crude oil tank through an oil conveying pipeline, and the three-phase separator is connected with the flowback fluid recovery tank through a water conveying pipeline.

[0007] The utility model discloses a closed pressure container's crude oil tank, gas conveying pipeline, gas control valve, gas pressure regulating valve and low-pressure connecting pipeline form a low-pressure subsystem, further, the low-pressure subsystem is connected with external gas boiler or / and gas generator through gas pipeline.

[0008] The utility model discloses a gas switch valve is equipped on the low-pressure connecting pipeline.

[0009] The utility model discloses a flowback fluid recovery tank adopts atmospheric vessel or closed pressure container, and bottom water pipeline is arranged between the bottom of the crude oil tank and the flowback fluid recovery tank, bottom water pipeline valve is arranged on the bottom water pipeline, and low-low pressure working mode of the low-pressure closed pressure container can be used for the flowback fluid recovery tank and the crude oil tank, further, bottom water pump is arranged on the bottom water pipeline, further, oil accumulation pipeline is arranged between the middle or upper portion of the flowback fluid recovery tank and the crude oil tank, oil pump and oil accumulation valve are arranged on the oil accumulation pipeline, and the oil accumulation pipeline is used for assisting oil and water distribution array sensor to discharge the oil accumulation in the upper portion of the flowback fluid recovery tank into the crude oil tank.

[0010] The utility model discloses that the upper portion of the crude oil tank and the upper portion of the flowback fluid recovery tank are equipped with gas pipeline, and gas valve is arranged on the gas pipeline, which is used for realizing normal pressure operation of the crude oil tank under the working condition such as overhaul.

[0011] The utility model discloses that oil control valve is arranged on the oil conveying pipeline, and free water control valve is arranged on the water conveying pipeline, which is used for realizing the adjustment control of the oil conveying pipeline and the water conveying pipeline connected with the three-phase separator respectively.

[0012] The crude oil tank is provided with a sectional oil-water analysis and measurement array, which is used for monitoring the oil-water distribution condition of the crude oil recovery tank, and can realize real-time control of the oil-water interface, total liquid level, water content of each layer of crude oil, overall water content of crude oil in the tank and other parameters in the crude oil recovery tank, so that fine management of oil and gas production is realized.

[0013] The sectional oil-water analysis and measurement array can also be arranged on the flowback fluid recovery tank to monitor the oil-water interface and total liquid level in the flowback fluid recovery tank, so that the accumulated oil layer in the flowback fluid recovery tank can be removed or the water content at the liquid outlet of the flowback fluid recovery tank is monitored when necessary.

[0014] Compared with the prior art, the present application has the following advantages: (1) The closed operation of the main oil and gas production device and process of the oil well is realized, and the running, leaking and escaping of the oil well production associated gas represented by methane are systematically eliminated, so that the safety and environmental protection of oil and gas production of the oil well are ensured. (2) The production process is reasonable and simple, the automation and informatization level and the cost performance are high, the main index parameters such as the real-time monitoring of the main index parameters such as the overall and layered water content distribution of crude oil, three-phase separation effect, water content of the external oil and gas are realized, which meets the requirements of large-scale and intensive production of oil fields. (3) The low-pressure subsystem not only provides a high-capacity and stable buffer power source for the external liquid and process control, but also provides a stable gas source for the power system such as the gas boiler and the gas generator on the site, which can fully utilize the abandoned resources and increase the income and save the cost. (4) The external oil and gas is stable and meets the requirements, and the external process is safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a structural schematic diagram of the present application. Figure 1 FIG. 2 is a structural schematic diagram of the present application.

[0016] FIG. 3 is a connection schematic diagram of the present application. Figure 2 FIG. 4 is a structural schematic diagram of the present application.

[0017] Figure 3 FIG. 5 is a structural schematic diagram of the present application.

[0018] FIG. 6 is a structural schematic diagram of the present application. Figure 4 FIG. 7 is a structural schematic diagram of the present application.

[0019] Figure 5 FIG. 8 is a structural schematic diagram of the present application.​​

[0020] Appendix Figure 6 This is a schematic diagram of an oil-water analysis array with a segmented structure in an embodiment of this utility model.

[0021] Figure reference numerals: Oil well 1, Wellhead manifold 2, Three-phase separator 3, Water pipeline 34, Free water control valve 341, Oil pipeline 35, Crude oil control valve 351, Gas pipeline 36, Gas control valve 361, Gas pressure regulating valve 362, Flame arrestor 363, Low-pressure connection pipeline 365, Gas switch valve 3651, Drainage fluid recovery tank 4, Drainage fluid export pipeline 401, Drainage fluid export valve 4011, Liquid flow meter 4012, Drainage pump 4013, Segmented oil-water analysis measurement array on the drainage fluid recovery tank 41, Gas breather valve 42, Gas pipeline 45 2. Gas valve 4521, oil collection pipeline 453, oil pump 4531, oil collection valve 4532, crude oil tank 5, crude oil export pipeline 501, crude oil export valve 5011, crude oil export liquid flow meter 5012, oil discharge pump 5013, self-use gas connection pipeline 502, gas boiler 5021, gas generator 5022, segmented oil-water analysis and measurement array on crude oil tank 51, sister tank group consisting of crude oil tank and atmospheric pressure backflow tank 54, bottom water pipeline 541, bottom water pipeline valve 5411, bottom water pump 5412, gas combustion flare / gas collector 6. Detailed implementation method:

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] As attached Figure 1 and appendix Figure 2 As shown, this utility model proposes a closed-loop oil well oil and gas production metering device, which includes a three-phase separator 3, a flowback fluid recovery tank 4, a crude oil tank 5, and a gas combustion torch / gas collector 6. The oil-water-gas multiphase flow output from the oil well 1 is input to the three-phase separator 3 through a pipeline. The three-phase separator 3 is connected to the gas burner or gas collector 6 through a gas transmission pipeline 36, and to the crude oil tank 5 through an oil transmission pipeline 35. The three-phase separator 3 is connected to the flowback fluid recovery tank 4 through a water transmission pipeline 34. The crude oil tank 5 is a closed pressure vessel. The gas transmission pipeline 36 is equipped with a gas control valve 361 and a gas pressure regulating valve 362. The gas pressure regulating valve 362 is located between the gas control valve 361 and the gas combustion torch / gas collector 6. A low-pressure connection pipeline 365 is also provided. One end of the low-pressure connection pipeline 365 is connected to the gas transmission pipeline 36 between the gas control valve 361 and the gas pressure regulating valve 362, and the other end is connected to the crude oil tank 5.

[0024] The low-pressure connecting pipeline 365 of this utility model is equipped with a gas switch valve 3651.

[0025] The utility model discloses a return flow recovery tank 4 adopts normal pressure container or closed pressure container, and the bottom of crude oil tank 5 is equipped with bottom water pipeline 541 with return flow recovery tank 4, is equipped with bottom water pipeline valve 5411 on bottom water pipeline 541, and can further be equipped with bottom water pump 5412, further, the middle part or upper portion of return flow recovery tank 4 is also equipped with oil accumulation pipeline 453 with crude oil tank 5, is equipped with oil pump 4531 and oil accumulation valve 4532 on oil accumulation pipeline 453, is used for under the assistance of oil and water distribution array sensor, the oil of upper portion in return flow recovery tank is discharged into crude oil tank.

[0026] The utility model discloses the upper portion of crude oil tank 5 is equipped with gas pipeline 452 with the upper portion of return flow recovery tank 4, and is equipped with gas valve 4521 on gas pipeline 452, is used for under the maintenance condition etc., makes crude oil tank 5 can realize normal pressure operation.

[0027] The utility model discloses be equipped with crude oil control valve 351 on oil pipeline 35, be equipped with free water control valve 341 on water pipeline 34, be equipped with gas control valve 361 on gas pipeline 36, (can be regarded as the part of three -phase separator, is the three -phase separator itself for realizing oil, water, gas separation), is used for realizing the regulation control of oil pipeline, water pipeline, gas pipeline connected with three -phase separator 3 respectively.

[0028] The utility model discloses crude oil tank 5 is equipped with segmented oil and water analysis measurement array, is used for monitoring the oil and water distribution condition of crude oil recovery tank, real -time grasps the oil and water interface in crude oil recovery tank, total liquid level and each stratified crude oil's water content, the overall water content of crude oil in tank, tank crude oil total amount parameter, realizes the fine management of oil gas production, can also monitor the crude oil water content of the horizontal direct export crude oil port in crude oil tank through segmented oil and water analysis measurement array, thereby participates in the control of export crude oil.

[0029] Also can be equipped with segmented oil and water analysis measurement array for monitoring the oil and water interface in return flow recovery tank, total liquid level parameter, to facilitate the exclusion of the oil layer in it or the monitoring of the water content of the horizontal direct export liquid port in return flow recovery tank when necessary.

[0030] In the utility model, the external connecting pipeline of crude oil tank 5 or return flow recovery tank 4 can be equipped with liquid flowmeter and automatic control valve linked therewith, and the linked liquid flowmeter and automatic control valve are combined with the water content of crude oil at the export crude oil port, which can realize fine and substantial control of the amount of export crude oil, and when the crude oil tank or return flow recovery tank is emptied, the liquid flowmeter will change abnormally, and accordingly the automatic control valve can be controlled to close in time, realizing automatic loading.

[0031] Embodiment 1:

[0032] The example proposes a closed oil well oil and gas production metering device as shown in the accompanying Figure 1 , 2 The example uses a closed pressure vessel for the crude oil tank 5 and a normal pressure vessel for the flowback fluid recovery tank 4. As shown in the accompanying Figure 2 The example provides a gas breathing valve 42 at the top of the flowback fluid recovery tank 4. The example also provides an oil accumulation pipeline 453 between the middle or upper part of the flowback fluid recovery tank 4 and the crude oil tank 5. An oil pump 4531 and an oil accumulation valve 4532 are provided on the oil accumulation pipeline 453 to discharge the oil accumulated in the upper part of the flowback fluid recovery tank 4 into the crude oil tank with the assistance of the oil-water distribution array sensor. To achieve this function, the example provides an oil-water analysis and measurement array in the flowback fluid recovery tank 4 and the crude oil tank 5, respectively.

[0033] The example uses the segmented oil-water analysis and measurement array structure and measurement principle described in the previously proposed invention patent 201280001767.5. The array can not only measure the water content of the oil-water mixture layer by layer, but also accurately determine the height of the total liquid level and the oil-water interface. The integrated oil-water interface and liquid level measurement assembly of the segmented oil-water analysis function can use a commercial multiphase oil-water interface instrument such as model HDW-121.

[0034] Example 2:

[0035] As shown in the accompanying Figure 3 and the accompanying Figure 4 The example proposes a closed oil well oil and gas production metering device that includes a three-phase separator 3, a flowback fluid recovery tank 4, a crude oil tank 5, and a gas combustion torch / gas collector 6. The oil-water-gas multiphase flow output from the oil well 1 is input to the three-phase separator 3 through a pipeline. The three-phase separator 3 is connected to the gas combustion torch / gas collector 6 through a gas pipeline 36, connected to the crude oil tank 5 through an oil pipeline 35, and connected to the flowback fluid recovery tank 4 through a water pipeline 34. The crude oil tank 5 is a closed pressure vessel. The gas pipeline 36 is provided with a gas control valve 361 and a gas pressure regulating valve 362. The gas pressure regulating valve 362 is arranged between the gas control valve 361 and the gas combustion torch / gas collector 6. A low-pressure connection pipeline 365 is also provided. One end of the low-pressure connection pipeline 365 is connected to the gas pipeline 36 between the gas control valve 361 and the gas pressure regulating valve 362, and the other end is connected to the crude oil tank 5.

[0036] The crude oil tank 5, the gas pipeline 36, the gas control valve 361, the gas pressure regulating valve 362 and the low-pressure connecting pipeline 365 form a low-pressure subsystem. By adjusting the pressure of the gas pressure regulating valve 362 on the gas pipeline 36, the amount of gas remaining in the containers and pipelines in the low-pressure subsystem is adjusted, so that the crude oil tank 5 is in a pressure maintaining state during operation, which is beneficial to the output of crude oil and the removal of residual water in the crude oil tank. The low-pressure subsystem is connected to the external gas boiler 5021 or / and the gas generator 5022 through the gas pipeline.

[0037] In order to improve the safety of system operation, the fire damper 363 is arranged at the rear end of the gas pressure regulating valve 362 of the gas pipeline 36.

[0038] In the example, the crude oil tank 5 and the flowback fluid recovery tank 4 form a sister tank group 54. The bottom water pipeline 541 is arranged between the bottom of the crude oil tank 5 and the flowback fluid recovery tank 4, and the bottom water pipeline valve 5411 or the bottom water pump 5412 is arranged on the bottom water pipeline 541. The gas pipeline 452 is arranged at the top of the two tanks, and the gas valve 4521 is arranged on the gas pipeline 452. During use, as long as the gas valve 4521 on the gas pipeline 452 at the top of the two tanks is opened and the gas pipeline is connected, the closed operation of the tank group is realized.

[0039] During the oil-water separation and stabilization process in the tank before external transportation, if the bottom water in the crude oil tank 5 accumulates to a sufficient height, the segmented oil-water analysis and measurement array 51 will accurately and timely inform the opening of the bottom water valve 5411 or the bottom water pump 5412, and the bottom water will be discharged into the flowback fluid recovery tank 4 through the bottom water pipeline 541.

[0040] During the process of transporting crude oil, by monitoring the real-time water content of crude oil measured by the segmented oil-water analysis and measurement array 51 at the level of the crude oil outlet and below in the crude oil tank 5, on the one hand, the tendency of over-standard transportation of crude oil in the tank is predicted, and the height of the oil-water interface and the standard crude oil is reduced by discharging bottom water, to ensure the stable and standard transportation of crude oil; on the other hand, by combining the water content measured by the measurement unit at the level of the crude oil outlet with the data measured by the crude oil outlet valve 5011 and the liquid flowmeter 5012 installed on the crude oil outlet pipeline 501, the net value and other production parameters of the transported crude oil can also be easily obtained.

[0041] Compared with the prior art, the utility model has following advantages: (1) realize the closed operation of oil well oil gas main production device and flow, systematically eliminate the oil well production associated gas of methane as representative of running, guarantee the safety and environmental protection of oil well oil gas production. (2) Production process is reasonable and simple, and automation information level and cost performance are high, realize the real -time monitoring of main index parameter such as oil layer water content distribution, three -phase separation effect, water content of outside transport crude oil of on -the -spot production metering flow, meet the requirement of oilfield production scale, intensification. (3) Low pressure subsystem not only provides a capacity high and stable buffer power source for outside transport liquid, flow control, but also provides a stable gas source for the power system of on -the -spot gas boiler, gas generator etc., can make full use of abandoned resources, increase income and save. (4) Outside transport crude oil stable guarantee degree is high, and the outside transport process is safe and reliable.

Claims

1. A closed oil and gas production metering device for oil wells, provided with a three-phase separator, a flowback fluid recovery tank, a crude oil tank, a gas combustion torch / gas collector, a multiphase flow of oil, water and gas output from the oil well is input to the three-phase separator through a pipeline, the three-phase separator is connected with the gas combustion torch or the gas collector through a gas conveying pipeline, and is connected with the crude oil tank through an oil conveying pipeline, the three-phase separator is connected with the flowback fluid recovery tank through a water conveying pipeline, characterized in that, The crude oil tank is a closed pressure container, the gas pipeline is provided with a gas control valve and a gas pressure regulating valve, the gas pressure regulating valve is arranged between the gas control valve and the gas combustion torch / gas collector, and a low-pressure connecting pipeline is further arranged, one end of the low-pressure connecting pipeline is connected to the gas pipeline between the gas control valve and the gas pressure regulating valve, and the other end is connected to the crude oil tank.

2. The closed oil well production metering device of claim 1, wherein, The low-pressure sub-system is formed by the crude oil tank, the gas pipeline, the gas control valve, the gas pressure regulating valve and the low-pressure connecting pipeline.

3. The closed oil well production metering device of claim 2, wherein, The low-pressure sub-system is connected to an external gas boiler or / and a gas generator through a gas pipeline.

4. The closed oil well production metering device of claim 1, wherein, The low-pressure connecting pipeline is provided with a gas switch valve.

5. The closed oil well production metering device of claim 1, wherein, The produced fluid recovery tank is a normal pressure container or a closed pressure container, a bottom water pipeline is arranged between the bottom of the crude oil tank and the produced fluid recovery tank, a bottom water pipeline valve is arranged on the bottom water pipeline, and when the produced fluid recovery tank is a low-pressure closed pressure container, a bottom water pump is arranged on the bottom water pipeline.

6. The closed oil well production metering device of claim 1, wherein, An oil accumulation pipeline is further arranged between the middle or upper part of the produced fluid recovery tank and the crude oil tank, an oil pump and an oil accumulation valve are arranged on the oil accumulation pipeline.

7. The closed oil well production metering device of claim 1, wherein, A gas pipeline is arranged between the upper part of the crude oil tank and the upper part of the produced fluid recovery tank, and a gas valve is arranged on the gas pipeline.

8. The closed oil well production metering device of claim 1, wherein, A crude oil control valve is arranged on the oil pipeline, and a free water control valve is arranged on the water pipeline.

9. The closed oil well production metering device of claim 1, wherein, A segmented oil-water analysis and measurement array is arranged on the crude oil tank and the produced fluid recovery tank.

10. The closed oil well production metering device of claim 1, wherein, A liquid flow meter and an automatic control valve are arranged on the external pipeline of the crude oil tank or the produced fluid recovery tank.

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