High-gas-content oil and gas metering and mixed conveying device

Abstract

The utility model discloses a high-gas-content oil and gas metering and mixed conveying device, and belongs to the technical field of oil and gas conveying. Comprising a controller, a mixed transportation inlet pipe, a mixed transportation pump, a mixed transportation outlet pipe, a gas-liquid separator, a gas phase outlet pipe, a liquid phase outlet pipe, a liquid supplementing pipe, a main outlet pipe, an electric valve, a flow meter and the like, a high-gas-content oil-gas mixture firstly enters the mixed transportation pump for mixed transportation and then enters the gas-liquid separator after being pressurized by the pump, and a gas phase medium and a liquid phase medium are separated; wherein the gas-phase medium and part of the liquid-phase medium are directly output to a large station after being metered, part of the liquid-phase medium returns to a pump cavity after being subjected to pressure reduction adjustment, and liquid is supplemented to a pump when slug flow occurs, so that gas and liquid are continuously and reliably conveyed to the large station. The utility model discloses can replace traditional site, realize oil-gas-water automatic metering and mixed transportation, save land resource, save a lot of investment, realize unattended operation function, and adapt to high gas content, frequent slug flow production condition.

Description

Technical Field

[0001] The utility model relates to a high gas-content oil-gas metering and mixing transportation device, belonging to the technical field of oil-gas transportation. Background Art

[0002] The oil-gas of a single-production single well or the oil-gas converged from several single-production single wells enters an external transportation station and then is transported to a large-scale treatment station for treatment. The traditional transportation method is as follows: the oil-gas is separated, the separated gas is transported to the treatment station for dehydration and desulfurization through a compressor, and the separated oil-water mixture is transported or carried to the treatment station for dehydration and sand removal treatment by pumping or by vehicle. The traditional treatment method often requires the construction of two oil-gas transportation pipelines respectively, and at the same time, large separators, heating devices (such as heating furnaces), compressors, external transportation pumps, etc. are set, with a large investment. Especially in the loess plateau and the desert production areas of the Tarim Basin, the production management cost also increases, which no longer meets the requirements of the current intelligent oilfield construction and improving quality and efficiency.

[0003] At present, the emerging transportation method is as follows: the produced oil-gas is not separated, no external transportation station is built, no separator and heating furnace are installed, and direct mixing transportation is carried out. It is only transported through a single mixing transportation pipeline to a large station for separation treatment. The emerging transportation method can greatly reduce the investment cost and the management difficulty and labor cost; at the same time, due to the cancellation of pressure vessels, the safety level is reduced, and the production energy consumption is reduced. The existing mixing transportation pumps can usually only adapt to the working conditions with a gas content rate below 80%. However, in the above-mentioned oilfield working conditions, the gas content rate often exceeds 95% or even higher. Under such high gas content rate working conditions, the mixing transportation pump heats up quickly, resulting in the mixing transportation pump being unable to work normally.

[0004] The Chinese invention patent application with the application number 202011598765.1 discloses a liquid-supplemented oil-gas mixing transportation device, which relates to the technical field of oil-gas transportation and solves the problem that slug flow occurs in the existing oil-gas mixing transportation device under high gas content rate working conditions and the mixing transportation pump is prone to failure. The technical solution adopted is: the liquid-supplemented oil-gas mixing transportation device includes a mixing transportation pump, the inlet end and the outlet end of the mixing transportation pump are respectively connected to a mixing transportation inlet pipe and a mixing transportation discharge pipe, the mixing transportation discharge pipe is connected to a tee, one branch of the tee is provided with a valve and connected to a mixing transportation discharge main pipe, the other branch is provided with a valve and connected to a gas-liquid separator, the gas outlet of the gas-liquid separator is provided with a valve and connected to the mixing transportation discharge main pipe, the liquid outlet is provided with a valve and connected to the mixing transportation discharge main pipe, and the liquid outlet is also connected to the inlet end of the mixing transportation pump through a first liquid supplement pipe. The mixing transportation pump is provided with a cooling structure. The liquid-supplemented oil-gas mixing transportation device further includes a liquid supplement tank, and the liquid supplement tank is connected to the inlet end of the mixing transportation pump through a second liquid supplement pipe. This invention is applicable to the oil-gas mixing transportation under high gas content rate working conditions. However, its mixing transportation structure pipe network layout is complex, requiring a high cost investment, only solving the mixing transportation problem but not having the oil-gas metering function, unable to automatically store production data, and not intelligent enough. Summary of the Invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a high gas content oil and gas metering and mixing transportation device.

[0006] The technical solution adopted by the utility model is as follows: Design a high gas content oil and gas metering and mixing transportation device for the transportation and treatment of high gas content oil and gas mixtures, which includes a controller, a mixing transportation inlet pipe, a mixing transportation pump, a mixing transportation discharge pipe, a gas-liquid separator, a gas phase discharge pipe, a liquid phase discharge pipe, a liquid supplement pipe, a total discharge pipe, an electric valve and a flowmeter. The input end and the output end of the mixing transportation pump are respectively connected to the mixing transportation inlet pipe and the mixing transportation discharge pipe. The end of the mixing transportation discharge pipe far from the mixing transportation pump is connected to the gas-liquid separator. The gas-liquid separator is provided with a gas phase discharge pipe, a liquid phase discharge pipe and a liquid supplement pipe. The gas phase discharge pipe and the liquid phase discharge pipe are respectively connected to the total discharge pipe. The liquid supplement pipe is connected to the input end of the mixing transportation pump; Electric valves are respectively arranged on the mixing transportation inlet pipe, the mixing transportation discharge pipe, the gas phase discharge pipe, the liquid phase discharge pipe and the liquid supplement pipe. Flowmeters are respectively arranged on the gas phase discharge pipe, the liquid phase discharge pipe and the liquid supplement pipe. The mixing transportation pump, the electric valve and the flowmeter are respectively electrically connected or communicatively connected to the controller.

[0007] Furthermore, this design also includes a ball valve and a cooler. A cooler is arranged on the pipe body of the liquid supplement pipe between the electric valve on the liquid supplement pipe and the gas-liquid separator, and a ball valve is arranged on the pipe body of the liquid supplement pipe between the cooler and the gas-liquid separator.

[0008] Furthermore, this design also includes an electric control valve. A parallel pipeline is arranged on the pipe body of the liquid supplement pipe between the electric valve and the cooler. On one branch pipe of the parallel pipeline, a ball valve, an electric control valve, a flowmeter and a ball valve are successively connected in series from the input end to the output end, and a ball valve is arranged on the other branch pipe.

[0009] Furthermore, this design also includes a bypass pipe and a safety valve. A bypass pipe is arranged between the inlet end and the outlet end of the mixing transportation pump, and a safety valve is arranged on the bypass pipe. Switch valves are respectively arranged at the inlet end and the outlet end of the safety valve. A connecting pipe is arranged between the inlet end of the switch valve at the inlet end of the safety valve and the outlet end of the mixing transportation pump, and a switch valve is also arranged on the connecting pipe.

[0010] Furthermore, a safety valve is arranged at the upper end of the gas-liquid separator of this design, and an emptying pipe is arranged at the lower end. A switch valve is arranged on the emptying pipe.

[0011] Even further, this design also includes a check valve. The check valve is arranged on the mixing transportation discharge pipe and on the pipe body of the mixing transportation discharge pipe between the outlet end of the bypass pipe and the electric valve on the mixing transportation discharge pipe.

[0012] Furthermore, this design also includes a filter, which is arranged on the mixed transportation inlet pipe and located on the mixed transportation inlet pipe between the electric valve and the inlet end of the bypass pipe on the mixed transportation inlet pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] On the one hand, when using the present utility model, after the oil-gas mixture is pressurized by the mixed transportation pump, it enters the gas-liquid separator. Part of the separated liquid enters the mixed transportation pump through the liquid supplement pipe, thereby increasing the proportion of the liquid entering the mixed transportation pump and adapting to the production conditions of high gas content rate and frequent slug flow. On the other hand, the pipeline layout of the mixed transportation structure of the present utility model is relatively simple, reducing the cost investment. And through the settings of the electric valve, flowmeter, controller, etc., it is made more intelligent. The present utility model can replace the traditional station, realize automatic metering - mixed transportation of oil, gas and water, save land resources, save a large amount of investment, and realize the unattended function.

[0015] The present utility model is aimed at single well or multiple wells with high gas content, and can reliably meter and mix transport; at the same time, it cleverly uses separation and metering, separates the liquid (oil and water) in the medium and returns it to the inlet of the mixed transportation pump for liquid supplement to ensure the normal operation of the pump; and can upload the real-time working status, remotely monitor and locally store the production history data. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the structure layout of the present utility model.

[0018] In the figure: 1, mixed transportation inlet pipe; 2, mixed transportation pump; 3, mixed transportation discharge pipe; 4, gas-liquid separator; 5, gas phase discharge pipe; 6, liquid phase discharge pipe; 7, liquid supplement pipe; 8, total discharge pipe; 9, electric valve; 10, flowmeter; 11, ball valve; 12, cooler; 13, electric control valve; 14, bypass pipe; 15, safety valve; 16, switch valve; 17, connecting pipe; 18, drain pipe; 19, check valve; 20, filter. Detailed Embodiment

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, if the terms "installation", "connection" and "connection" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0021] Embodiment 1

[0022] As Figure 1As shown in the figure, a high gas-content oil and gas metering and mixing transportation device is used for the transportation and treatment of high gas-content oil and gas mixtures. It includes a controller (not shown in the attached figure), a mixing transportation inlet pipe 1, a mixing transportation pump 2, a mixing transportation discharge pipe 3, a gas-liquid separator 4, a gas-phase discharge pipe 5, a liquid-phase discharge pipe 6, a supplementary liquid pipe 7, a total discharge pipe 8, an electric valve 9, and a flowmeter 10. The mixing transportation pump 2 is a screw pump. The input end and the output end of the mixing transportation pump 2 are respectively connected to the mixing transportation inlet pipe 1 and the mixing transportation discharge pipe 3, and the high gas-content oil and gas mixture is input through the mixing transportation inlet pipe 1. One end of the mixing transportation discharge pipe 3 far from the mixing transportation pump 2 is connected to the gas-liquid separator 4. The gas-liquid separator 4 is provided with a gas-phase discharge pipe 5, a liquid-phase discharge pipe 6, and a supplementary liquid pipe 7. The output ends of the gas-phase discharge pipe 5 and the liquid-phase discharge pipe 6 are respectively connected to the total discharge pipe 8. The output end of the supplementary liquid pipe 7 is connected to the input end of the mixing transportation pump 2 (when slug flow (pure gas state) occurs during oil and gas mixing transportation and the mixing transportation pump 2 cannot transport, a part of the liquid medium separated by the gas-liquid separator 4 is transported to the inlet end of the mixing transportation pump 2 through the supplementary liquid pipe 7 to reduce the gas content in the oil and gas mixture entering the mixing transportation pump 2 to ensure normal transportation). Electric valves 9 are respectively provided on the mixing transportation inlet pipe 1, the mixing transportation discharge pipe 3, the gas-phase discharge pipe 5, the liquid-phase discharge pipe 6, and the supplementary liquid pipe 7. Flowmeters 10 are respectively provided on the gas-phase discharge pipe 5, the liquid-phase discharge pipe 6, and the supplementary liquid pipe 7. The mixing transportation pump 2, the electric valve 9, and the flowmeter 10 are respectively electrically connected or communicatively connected to the controller. The controller can adopt existing technologies. It at least has a control module to control the on-off of the mixing transportation pump 2, the electric valve 9, etc. It also has a display and storage module to display and receive and store the detection data of the flowmeter 10. The data is stored for at least two years or more. The operation state of the mixing transportation device can also be monitored through the data of the flowmeter 10 and automatically adjusted. When necessary, manual remote intervention can also be carried out for adjustment.

[0023] In addition, a pressure gauge is provided on the mixing transportation inlet pipe 1, a pressure sensor, a temperature sensor, etc. are provided on the mixing transportation pump 2, a pressure measuring instrument, a temperature measuring instrument, etc. are provided on the mixing transportation discharge pipe 3, and a temperature measuring instrument, etc. are provided on the gas-liquid separator 4. The above instruments can be electrically connected or communicatively connected to the controller to cooperate to realize automatic metering and mixing transportation of oil, gas, and water, and realize intelligent monitoring of the operation state of the mixing transportation device.

[0024] It should be noted that the liquid supplement process of the liquid supplement pipe 7 will affect the efficiency of the hybrid pump 2 to a certain extent. Therefore, when there is no slug flow (pure gas state), if the hybrid pump 2 can operate normally, it is not necessary to supplement the liquid. The control logic for whether to add liquid supplement is as follows: when the inlet pressure of the hybrid pump 2 is normal / the pump body temperature is normal, it indicates that the oil and gas transportation is normal at this time and there is no slug flow phenomenon, so it is not necessary to supplement the liquid; when the inlet pressure of the hybrid pump 2 is normal / the pump body temperature continuously rises to the set value (pressure / temperature can be separate or interlocked), the electric valve 9 on the liquid supplement pipe 7 is opened to start liquid supplement; after a period of liquid supplement, when the pressure / temperature of the hybrid pump 2 returns to normal, the electric valve 9 on the liquid supplement pipe 7 is closed to stop liquid supplement.

[0025] Embodiment 2

[0026] This embodiment is a further optimization and refinement of the structure of the hybrid transportation device on the basis of Embodiment 1, specifically as follows:

[0027] The high gas content oil and gas metering and hybrid transportation device described in this embodiment further includes a ball valve 11 and a cooler 12. A cooler 12 is provided on the pipe body of the liquid supplement pipe 7 between the electric valve 9 and the gas-liquid separator 4, and a ball valve 11 is provided on the pipe body of the liquid supplement pipe 7 between the cooler 12 and the gas-liquid separator 4. The greater the gas content of the oil and gas mixture, the higher the transportation temperature, and at the same time the temperature of the pump body of the hybrid pump 2 will also rise (up to 120 °C), and the temperature of the liquid supplement medium will also be correspondingly high. The liquid medium separated by the gas-liquid separator 4 is usually low-water condensate oil, which starts to distill at 20 °C and vaporizes or even turns into a gas at 80 °C, failing to meet the liquid supplement requirements and instead causing the temperature of the pump body of the hybrid pump 2 to continue to rise, forming a vicious cycle. Therefore, it is necessary to cool the liquid supplement through the cooler 12, for example, to cool it to about 50 °C so that it is basically in a liquid state, which can lubricate the spiral sleeve and form an oil film sealing cavity to ensure normal gas transportation. A pressure measuring instrument is also provided on the liquid supplement pipe 7 at the output end of the cooler 12, and this pressure measuring instrument is also electrically connected or communicatively connected to the controller. In addition, a cooler 12 is provided on the liquid supplement pipe 7, so that the separated liquid is cooled before entering the hybrid pump 2, which is beneficial to controlling the temperature of the hybrid pump 2.

[0028] Embodiment 3

[0029] This embodiment is a further optimization and refinement of the structure of the hybrid transportation device on the basis of Embodiment 2, specifically as follows:

[0030] The high gas content oil and gas metering and hybrid transportation device described in this embodiment further includes an electric control valve 13. A parallel pipeline is provided on the pipe body of the liquid supplement pipe 7 between the electric valve 9 and the cooler 12. On one branch pipe of the parallel pipeline, a ball valve 11, an electric control valve 13, a flow meter 10 and a ball valve 11 are sequentially connected in series from the input end to the output end, and a ball valve 11 is provided on the other branch pipe.

[0031] Example 4

[0032] This example is a further optimization and refinement of the structure of the multiphase transportation device based on Example 3. Specifically:

[0033] The high gas-content oil and gas metering multiphase transportation device described in this example further includes a bypass pipe 14 and a safety valve 15. To ensure the safety of the multiphase pump 2 and prevent damage to the multiphase pump 2 caused by excessive pressure in the multiphase discharge pipe 3, a bypass pipe 14 is provided between the inlet end and the outlet end of the multiphase pump 2, and a safety valve 15 is provided on the bypass pipe 14. Switch valves 16 are respectively provided at the inlet end and the outlet end of the safety valve 15. A connecting pipe 17 is provided between the inlet end of the switch valve 16 at the inlet end of the safety valve 15 and the outlet end of the multiphase pump 2, and a switch valve 16 is also provided on the connecting pipe 17. The connecting pipe 17 is substantially directly connected to the inlet end and the outlet end of the multiphase pump 2. If there is a positive pressure in the multiphase inlet pipe 1 and the multiphase pump 2 is under maintenance, the oil and gas mixture can directly flow out through the connecting pipe 17.

[0034] Example 5

[0035] This example is a further optimization and refinement of the structure of the gas-liquid separator 4 based on Example 4. Specifically: A safety valve 15 is provided at the upper end of the gas-liquid separator 4, and a drain pipe 18 is provided at the lower end. A switch valve 16 is provided on the drain pipe 18, which is more convenient and safe to use.

[0036] Example 6

[0037] This example is a further optimization and refinement of the structure of the multiphase transportation device based on Example 5. Specifically:

[0038] The high gas-content oil and gas metering multiphase transportation device described in this example further includes a check valve 19. The check valve 19 is provided on the multiphase discharge pipe 3 to prevent backflow, and is located on the pipe body of the multiphase discharge pipe 3 between the outlet end of the bypass pipe 14 and the electric valve 9 on the multiphase discharge pipe 3.

[0039] Example 7

[0040] This example is a further optimization and refinement of the structure of the multiphase transportation device based on Example 6. Specifically:

[0041] The high gas-content oil and gas metering multiphase transportation device described in this example further includes a filter 20. The filter 20 is provided on the multiphase inlet pipe 1, and is located on the multiphase inlet pipe 1 between the electric valve 9 on the multiphase inlet pipe 1 and the inlet end of the bypass pipe 14. The filter 20 filters impurities from the high gas-content oil and gas mixture before it enters the multiphase pump 2, achieving the purpose of protecting the multiphase pump 2 and enabling it to operate smoothly.

[0042] When using the multiphase transportation device provided by the present utility model, a high gas-content oil-gas mixture is introduced through the inlet end of the multiphase transportation inlet pipe 1, enters the multiphase pump 2 after filtering impurities through the filter 20, is output to the multiphase discharge pipe 3 after being pressurized by the multiphase pump 2, and then enters the gas-liquid separator 4 after passing through the check valve 19 and the electric valve 9 in sequence. The gas medium generated after the separation by the gas-liquid separator 4 is discharged through the gas-phase discharge pipe 5 at the upper end of the gas-liquid separator 4. Part of the liquid medium is discharged through the liquid-phase discharge pipe 6, and the other part enters the replenishing pipe 7, and after being cooled by the cooler 12, it is introduced into the input end of the multiphase pump 2. The media entering the gas-phase discharge pipe 5, the liquid-phase discharge pipe 6, and the replenishing pipe 7 are respectively detected and recorded by the corresponding flow meters 10 and fed back to the controller.

[0043] In addition, in the description of the present utility model, unless otherwise specified, if the terms "multiple", "multiple roots", "multiple groups" are used, their meanings are two or more, and the meanings of "several", "several roots", "several groups" are one or more. In the description of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, if the terms "first", "second", "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] The specific embodiments of the present utility model have been described in detail above in conjunction with the drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present utility model.

Claims

1. A high-gas-content oil and gas metering and mixing device, used for the transportation and processing of high-gas-content oil and gas mixtures, characterized by: It includes a controller, a mixed flow inlet pipe, a mixed flow pump, a mixed flow discharge pipe, a gas-liquid separator, a gas phase discharge pipe, a liquid phase discharge pipe, a liquid replenishment pipe, a total discharge pipe, an electric valve and a flow meter; The input end and output end of the mixed flow pump are respectively connected to the mixed flow inlet pipe and the mixed flow discharge pipe, the end of the mixed flow discharge pipe away from the mixed flow pump is connected to the gas-liquid separator, the gas-liquid separator is provided with a gas phase discharge pipe, a liquid phase discharge pipe and a liquid replenishing pipe, the gas phase discharge pipe and the liquid phase discharge pipe are respectively connected to the total discharge pipe, and the liquid replenishing pipe is connected to the input end of the mixed flow pump; the mixed flow inlet pipe, the mixed flow discharge pipe, the gas phase discharge pipe, the liquid phase discharge pipe and the liquid replenishing pipe are respectively provided with electric valves, the gas phase discharge pipe, the liquid phase discharge pipe and the liquid replenishing pipe are respectively provided with flow meters, and the mixed flow pump, the electric valve and the flow meter are respectively electrically connected or communicatively connected with the controller.

2. The high gas content oil and gas metering and mixing device according to claim 1 is characterized in that: It also includes a ball valve and a cooler. The cooler is arranged on the tube body of the liquid replenishing tube between the electric valve and the gas-liquid separator on the liquid replenishing tube. The ball valve is arranged on the tube body of the liquid replenishing tube between the cooler and the gas-liquid separator.

3. The high gas content oil and gas metering and mixing device according to claim 2 is characterized in that: It also includes an electric regulating valve. A parallel pipeline is arranged on the pipe body of the liquid replenishing pipe between the electric valve and the cooler. A ball valve, an electric regulating valve, a flow meter and a ball valve are connected in series from the input end to the output end on one branch pipe of the parallel pipeline. A ball valve is arranged on the other branch pipe.

4. The high-gas content oil and gas metering and mixing device according to any one of claims 1 to 3, characterized in that: It also includes a bypass pipe and a safety valve. A bypass pipe is arranged between the inlet end and the outlet end of the mixed flow pump, and a safety valve is arranged on the bypass pipe. The inlet end and the outlet end of the safety valve are respectively provided with switch valves. A connecting pipe is arranged between the inlet end of the switch valve at the inlet end of the safety valve and the outlet end of the mixed flow pump, and the switch valve is also arranged on the connecting pipe.

5. The high-gas content oil and gas metering and mixing device according to claim 4 is characterized in that: The upper end of the gas-liquid separator is provided with a safety valve, the lower end is provided with a drain pipe, and the drain pipe is provided with a switch valve.

6. The high-gas content oil and gas metering and mixing device according to claim 5 is characterized in that: It also includes a check valve, which is arranged on the mixed flow discharge pipe and is located on the mixed flow discharge pipe body between the outlet end of the bypass pipe and the electric valve on the mixed flow discharge pipe.

7. The high gas content oil and gas metering and mixing device according to claim 6 is characterized in that: It also includes a filter, which is arranged on the mixed flow inlet pipe and is located on the mixed flow inlet pipe between the electric valve on the mixed flow inlet pipe and the inlet end of the bypass pipe.

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