System and method for collecting gas condensate in gas field produced water

Abstract

The invention relates to the technical field of gas field produced water treatment, and discloses a gas field produced water condensate oil collecting system and method.The system comprises an oil-water liquid level meter, an output pump, a produced water output pipeline, a condensate oil output pipeline, an oil collecting tank, a produced water adjusting tank and a control system; the oil-water liquid level meter is arranged in the unloading pool, the input end of the output pump is connected with the output end of the unloading pool, the output end of the output pump is arranged in a branch mode, one branch is connected with the input end of the produced water output pipeline, and the other branch is connected with the input end of the condensate oil output pipeline; the output end of the produced water output pipeline is connected to the produced water adjusting tank; the output end of the condensate oil output pipeline is connected with an oil receiving tank; control assemblies are arranged on the produced water output pipeline and the condensate oil output pipeline and used for controlling flowing of media in the produced water output pipeline and the condensate oil output pipeline; the collecting efficiency of the condensate oil in the produced water of the gas field is improved.

Description

Technical Field

[0001] This invention relates to the field of gas field produced water treatment technology, specifically to a system and method for collecting condensate oil from gas field produced water. Background Technology

[0002] Currently, the main methods for producing water from gas fields are tank truck transportation and pipeline transportation. In the early stage, the produced water in the gas gathering station's produced water tank has a settling and separation time of 4-24 hours, which allows some condensate oil to be initially separated. Then, it is transported by tank truck or pipeline into the unloading pool. During the transportation or pipeline transportation process, the condensate oil in the produced water will be separated again. After the produced water from the gas field enters the unloading pool, 70% of the condensate oil can be separated from the produced water by static settling. Currently, the suction inlet of the produced water booster pump in the gas field unloading pool is about 1.5m from the bottom of the pool, while the liquid level in the pool is always maintained at 2m-2.6m, rarely falling below 2m. Therefore, after a long period of accumulation, a large amount of condensate oil with low water content accumulates on the surface of the produced water in the unloading pool. As a large amount of produced water continues to enter the unloading pool, if this low water content condensate oil is not collected and transported in time, it will remain in the unloading pool for a long time, affecting the condensate oil recovery efficiency, reducing the effective volume of the unloading pool, and causing the oil content in the produced water to exceed the working range of the downstream oil removal equipment, affecting the normal operation of the equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a system and method for collecting condensate oil in produced water from gas fields, so as to solve the technical problem of how to improve the efficiency of condensate oil collection in produced water from gas fields.

[0004] This invention is achieved through the following technical solution: In the first aspect, a condensate oil collection system for produced water in a gas field includes an oil-water level gauge, an output pump, a produced water output pipeline, a condensate oil output pipeline, an oil collection tank, a produced water regulating tank, and a control system. The oil-water level gauge is installed in the unloading pool. The input end of the output pump is connected to the output end of the unloading pool. The output end of the output pump is branched, with one branch connected to the input end of the produced water output pipeline and the other branch connected to the input end of the condensate oil output pipeline. The output end of the produced water output pipeline is connected to the produced water regulating tank. The output end of the condensate oil output pipeline is connected to the oil receiving tank. Control components are installed on the produced water output pipeline and the condensate output pipeline to control the flow of the medium in the produced water output pipeline and the condensate output pipeline. The control system is connected to the control components of the produced water output pipeline and the condensate output pipeline, as well as the oil-water level gauge and the output pump control.

[0005] Preferably, the output end of the unloading pool is located at the bottom of the unloading pool.

[0006] Preferably, the control component for the produced water output pipeline is an electric ball valve for the produced water path. The control end of the electric ball valve for the produced water path is connected to the control system, which drives the electric ball valve for the produced water path to control the flow of produced water in the produced water output pipeline.

[0007] Preferably, an oil-water separator is provided between the produced water output pipeline and the produced water regulating tank, and the oil-water separator is also provided with an oil output end, which is connected to the oil receiving tank.

[0008] Preferably, the control components of the condensate oil output pipeline include a condensate oil circuit electric ball valve and a flow meter. The control terminals of the condensate oil circuit electric ball valve and the flow meter are respectively connected to the control system, which drives the condensate oil circuit electric ball valve to control the flow of condensate oil in the condensate oil output pipeline through the control system, and detects the flow rate of condensate oil through the flow meter.

[0009] Preferably, the control components include a central control server and a control platform. One end of the central control server is connected to the control components, oil-water level gauges, and output pumps of the produced water output pipeline and the condensate output pipeline, respectively, and the other end is connected to the control platform.

[0010] Furthermore, the central control server is equipped with a controller. The input end of the controller is connected to the output end of the signal input module, and the input end of the signal input module is connected to the oil and water level gauge. The output end of the controller is connected to the input end of the signal output module, and the output end of the signal output module is respectively connected to the control components and output pumps of the produced water output pipeline and the condensate output pipeline. The control end of the controller is connected to the control platform.

[0011] Furthermore, the controller's output is equipped with a human-machine interface module to display the data transmitted by the oil and water level gauge.

[0012] Secondly, the present invention also provides a method for collecting condensate oil from produced water in gas fields, based on the aforementioned system for collecting condensate oil from produced water in gas fields, comprising the following processes: The oil-water level gauge is placed in the unloading pool. The oil-water level gauge transmits the changes in the levels of produced water and condensate oil to the control system. When the control system displays that the changes in the levels of produced water and condensate oil transmitted by the oil-water level gauge have reached the produced water threshold, the control system sequentially controls the control components of the produced water output pipeline and the output pump to open, so that the produced water in the unloading pool flows through the output pump and the produced water output pipeline to the produced water regulating tank. When the control system displays that the changes in the levels of produced water and condensate oil transmitted by the oil-water level gauge have reached the condensate oil threshold, the control system sequentially controls the closure of the produced water output pipeline and the opening of the control components of the condensate oil output pipeline and the output pump, so that the condensate oil in the unloading pool flows through the output pump and the condensate oil output pipeline to the oil receiving tank.

[0013] Preferably, the produced water in the produced water output pipeline undergoes secondary oil-water separation through an oil-water separator. The separated produced water is output to the produced water regulating tank, and the separated condensate oil is recovered into the oil collection tank.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a condensate oil collection system for produced water in gas fields. The system involves installing an oil-water level gauge within an unloading pool, connecting the input of an output pump to the output of the unloading pool, and branching the output of the pump. One branch connects to the input of the produced water output pipeline, and the other branch connects to the input of the condensate oil output pipeline. The output of the produced water output pipeline connects to a produced water regulating tank, and the output of the condensate oil output pipeline connects to an oil collection tank. Control components are installed on both the produced water and condensate oil output pipelines to control the flow of media within them. The control system is connected to the control components of the produced water and condensate oil output pipelines, the oil-water level gauge, and the output pump, respectively. By detecting the produced water and condensate oil in the unloading pool through the oil-water level gauge and controlling the control components of the produced water and condensate oil output pipelines, the control system effectively separates and recovers the produced water and condensate oil in the unloading pool, improving the condensate oil collection efficiency of produced water in gas fields.

[0015] Furthermore, the output end of the unloading pool is located at the bottom of the unloading pool, which facilitates the output of produced water and condensate oil in the unloading pool through the output end at the bottom.

[0016] Furthermore, the control component for the produced water output pipeline is an electric ball valve for the produced water path. The control end of the electric ball valve for the produced water path is connected to the control system, which drives the electric ball valve for the produced water path to control the flow of produced water in the produced water output pipeline, thereby improving the recovery efficiency of the produced water.

[0017] Furthermore, an oil-water separator is installed between the produced water output pipeline and the produced water regulating tank. The oil-water separator is also equipped with an oil output end, which is connected to the oil collection tank. The produced water in the produced water output pipeline is separated a second time by the oil-water separator, which facilitates the secondary separation of condensate oil in the produced water into the oil collection tank, thereby improving the secondary recovery efficiency of condensate oil in the produced water.

[0018] Furthermore, the control components of the condensate oil output pipeline include an electric ball valve for the condensate oil circuit and a flow meter. The control terminals of the electric ball valve for the condensate oil circuit and the flow meter are respectively connected to the control system. The control system drives the electric ball valve for the condensate oil circuit to control the flow of condensate oil in the condensate oil output pipeline, and detects the flow rate of condensate oil through the flow meter. The electric ball valve for the condensate oil circuit controls the closure of the condensate oil output pipeline, effectively controlling the flow of condensate oil in the condensate oil output pipeline, and the flow rate of condensate oil is detected by the flow meter.

[0019] Furthermore, the control components include a central control server and a control platform. One end of the central control server is connected to the control components, oil-water level gauges, and output pumps of the produced water output pipeline and the condensate output pipeline, respectively, while the other end is connected to the control platform. The control components enable intelligent control of the produced water output pipeline and the condensate output pipeline, which greatly improves the intelligent collection efficiency of condensate oil in the produced water of the gas field.

[0020] This invention also provides a method for collecting condensate oil from produced water in gas fields. An automatic condensate oil transfer and collection logic program is set based on changes in the oil and water levels and the enrichment level of the condensate oil. When the oil recovery conditions are met, the oil recovery program is automatically activated, completing the switching of the oil-water transfer process, starting and stopping the produced water booster pump, and the flow meter measurement process. This achieves an automatic recovery process of enriched condensate oil. Compared with similar condensate oil recovery methods, this invention has a high degree of intelligent control of the process flow, and the recovered condensate oil has low water content and good stability. It can be widely applied to the oil removal and recovery processes of oil-containing and turbid water in industries such as oil and gas and coal chemical engineering.

[0021] Furthermore, the produced water in the produced water output pipeline undergoes secondary oil-water separation through an oil-water separator. The separated produced water is output to the produced water regulating tank, and the separated condensate oil is recovered into the oil collection tank. This effectively separates the condensate oil in the produced water, facilitating the secondary separation of the condensate oil in the produced water into the oil collection tank and improving the secondary recovery efficiency of the condensate oil in the produced water. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the condensate oil collection system in produced water from a gas field, as described in an embodiment of the present invention. In the diagram: 1-Unloading pool; 2-Oil-water level gauge; 3-Output pump; 4-Electric ball valve for produced water circuit; 5-Electric ball valve for condensate oil circuit; 6-Flow meter; 7-Central control server; 8-Control platform; 9-Oil-water separator; 10-Oil receiving tank; 11-Produced water regulating tank. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings: The purpose of this invention is to provide a system and method for collecting condensate oil in produced water from gas fields, so as to solve the technical problem of how to improve the efficiency of condensate oil collection in produced water from gas fields.

[0025] Example 1 See Figure 1 In one embodiment of the present invention, a condensate oil collection system for gas field produced water is provided for unloading pool 1, including oil-water level gauge 2, output pump 3, produced water output pipeline, condensate oil output pipeline, oil collection tank 10, produced water regulating tank 11 and control system. The oil-water level gauge 2 is installed in the unloading pool 1. The input end of the output pump 3 is connected to the output end of the unloading pool 1. The output end of the output pump 3 is branched, with one branch connected to the input end of the produced water output pipeline and the other branch connected to the input end of the condensate oil output pipeline. The output end of the produced water output pipeline is connected to the produced water regulating tank 11. The output end of the condensate oil output pipeline is connected to the oil receiving tank 10. Control components are installed on the produced water output pipeline and the condensate output pipeline to control the flow of the medium in the produced water output pipeline and the condensate output pipeline. The control system is connected to the control components of the produced water output pipeline and the condensate output pipeline, the oil-water level gauge 2, and the output pump 3, respectively.

[0026] Specifically, the output end of unloading pool 1 is located at the bottom of unloading pool 1.

[0027] Specifically, the control component of the produced water output pipeline is the produced water electric ball valve 4. The control end of the produced water electric ball valve 4 is connected to the control system, which is used to drive the produced water electric ball valve 4 to control the flow of produced water in the produced water output pipeline through the control system.

[0028] Specifically, an oil-water separator 9 is provided between the produced water output pipeline and the produced water regulating tank 11. The oil-water separator 9 is also provided with an oil output end, which is connected to the oil receiving tank 10.

[0029] Specifically, the control components of the condensate oil output pipeline include a condensate oil circuit electric ball valve 5 and a flow meter 6. The control terminals of the condensate oil circuit electric ball valve 5 and the flow meter 6 are respectively connected to the control system, which drives the condensate oil circuit electric ball valve 5 to control the flow of condensate oil in the condensate oil output pipeline, and detects the flow rate of condensate oil through the flow meter 6.

[0030] Specifically, the control components include a central control server 7 and a control platform 8. One end of the central control server 7 is connected to the control components of the produced water output pipeline and the condensate output pipeline, the oil-water level gauge 2 and the output pump 3, respectively, and the other end is connected to the control platform 8.

[0031] The central control server 7 is equipped with a controller. The input end of the controller is connected to the output end of the signal input module, and the input end of the signal input module is connected to the oil and water level gauge 2. The output end of the controller is connected to the input end of the signal output module, and the output end of the signal output module is connected to the control components and output pump 3 of the produced water output pipeline and the condensate output pipeline, respectively. The control end of the controller is connected to the control platform 8.

[0032] In this embodiment, the controller output is also equipped with a human-machine interaction module for displaying the data transmitted by the oil-water level gauge 2.

[0033] In summary, this embodiment provides a condensate oil collection system for gas field produced water. By installing an oil-water level gauge in the unloading pool, connecting the input of the output pump to the output of the unloading pool, and branching the output of the pump (one branch connecting to the input of the produced water output pipeline and the other to the input of the condensate oil output pipeline), the output of the produced water output pipeline is connected to the produced water regulating tank, and the output of the condensate oil output pipeline is connected to the oil collection tank. Control components are installed on both the produced water and condensate oil output pipelines to control the flow of media within them. The control system is connected to the control components of the produced water and condensate oil output pipelines, the oil-water level gauge, and the output pump, respectively. Through the detection of produced water and condensate oil in the unloading pool using the oil-water level gauge and the control components of the produced water and condensate oil output pipelines, the control system effectively separates and recovers the produced water and condensate oil in the unloading pool, improving the condensate oil collection efficiency of gas field produced water.

[0034] Example 2 See Figure 1 In one embodiment of the present invention, a method for collecting condensate oil from produced water in a gas field is provided, based on the aforementioned system for collecting condensate oil from produced water in a gas field, comprising the following processes: A digital model for oil-water transfer was established based on field data to determine the specific mode and timing of produced water and condensate transfer. An oil-water level gauge 2 is installed in the unloading pool 1 to transmit the data on changes in the levels of produced water and condensate oil to the central control server in a timely manner. Produced water output pipeline and condensate oil output pipeline are respectively set at the rear end of output pump 3, and both produced water output pipeline and condensate oil output pipeline are equipped with electric control valves, and the electric control valves are connected to the central control server 7. The electric valves of oil-water level gauge 2, output pump 3, produced water, and condensate oil output pipelines are intelligently interlocked in the central control server 7. The logic program for automatic transfer and recovery of condensate oil is set according to the digital model of oil-water transfer. That is, when the control system displays that the level change data of produced water and condensate oil transmitted by the oil-water level gauge 2 reaches the produced water threshold, the control system sequentially controls the control components of the produced water output pipeline and the output pump 3 to start, so that the produced water in the unloading pool 1 goes through the produced water output pipeline to the produced water regulating tank 11 through the output pump 3; when the control system displays that the level change data of produced water and condensate oil transmitted by the oil-water level gauge 2 reaches the condensate oil threshold, the control system sequentially controls the control components of the condensate oil output pipeline and the output pump 3 to start, so that the condensate oil in the unloading pool 1 goes through the condensate oil output pipeline to the oil receiving tank 10 through the output pump 3.

[0035] In this embodiment, an automatic condensate transfer and collection logic program is set according to the changes in oil and water levels and the enrichment degree of condensate oil. When the oil recovery conditions are met, the oil recovery program is automatically started, completing the switching of the oil-water transfer process, starting and stopping the produced water booster pump, and the flow meter measurement process. This realizes the automatic recovery process of enriched condensate oil, resulting in a high degree of intelligent control of the process flow, low water content and good stability of the recovered condensate oil. It can be widely used in the oil and gas, coal chemical and other industries for the removal and recovery of oil and turbid water containing oil.

[0036] In this embodiment, the field data includes produced water unloading volume, produced water oil content, oil-water separation time, separation degree, unloading pool volume and size, and produced water booster pump outlet height.

[0037] In this embodiment, after the condensate oil and produced water are separated and enriched in large quantities by detecting the oil-water level gauge, the produced water is first centrally transferred to lower the condensate oil level to the outlet of the produced water booster pump. Then, according to the control command, the produced water transfer process is automatically switched to the condensate oil process.

[0038] In this embodiment, an oil-water separator 9 is installed at the rear end of the electrically controlled valve of the produced water output pipeline. The output end of the oil-water separator 9 is connected to the water intake regulating tank 11 through a water guide pipe. The output end of the oil-water separator, located above the water guide pipe, is connected to the input end of the oil receiving tank 10 through an oil guide pipe.

[0039] In summary, this embodiment collects data on the unloading volume of produced water, oil content in the produced water, oil-water separation time, separation degree, unloading pool volume and dimensions, and the outlet height of the produced water booster pump. Based on the on-site data, a digital model of oil-water transfer is established to determine the specific mode and time for the transfer of produced water and condensate oil. Oil-water level gauges are installed in the unloading pool to transmit the real-time changes in the produced water and condensate oil levels to the central control server. The central control server and control platform receive the information and generate corresponding instructions. Produced water output pipelines and condensate oil output pipelines are respectively set up at the rear end of the output pump. The opening and closing of the produced water output pipeline is controlled by an electric ball valve in the produced water pipeline, and the opening and closing of the condensate oil output pipeline is controlled by an electric ball valve in the condensate oil pipeline. The electric ball valves in the produced water pipeline and the electric ball valves in the condensate oil pipeline are connected to the central control server. The electric valves of the output pump, produced water, and condensate oil output pipelines are intelligently interlocked in the central control server system. The logic program for automatic transfer and recovery of condensate oil is set according to the digital model. In the initial stage, after a large amount of condensate oil and produced water are separated and enriched, the produced water is first centrally transferred to lower the condensate oil level to the outlet of the produced water booster pump. Then, according to control commands, the produced water transfer process is automatically switched to the condensate oil process. Based on the changes in the produced water and condensate oil levels in the unloading pool and the enrichment degree of condensate oil, the switching of the condensate oil and produced water transfer processes is automatically completed according to preset central control commands. This enables the large-scale collection of enriched condensate oil. The electric ball valve in the condensate oil circuit of the condensate oil transfer process is opened. At this point, the precipitated oil enters the oil collection tank for collection. The oil volume can be detected by a flow meter. When the condensate oil level in the unloading pool drops to the system set value, the control system closes the condensate oil transfer process based on the feedback information from the oil-water level gauge and opens the electric ball valve of the produced water transfer process. At this time, the oil-water mixture enters the oil-water separator, where the oil and water are separated. The water then enters the water collection regulating tank through the water guide pipe, and the oil enters the oil collection tank through the oil guide pipe.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A condensate oil collection system for produced water from a gas field, used in an unloading pool (1), characterized in that, It includes an oil-water level gauge (2), an output pump (3), a produced water output pipeline, a condensate output pipeline, an oil collection tank (10), a produced water regulating tank (11), and a control system; The oil-water level gauge (2) is installed in the unloading pool (1). The input end of the output pump (3) is connected to the output end of the unloading pool (1). The output end of the output pump (3) is branched, with one branch connected to the input end of the produced water output pipeline and the other branch connected to the input end of the condensate oil output pipeline. The output end of the produced water output pipeline is connected to the produced water regulating tank (11). The output end of the condensate oil output pipeline is connected to the oil receiving tank (10). Control components are installed on the produced water output pipeline and the condensate output pipeline to control the flow of the medium in the produced water output pipeline and the condensate output pipeline. The control system is connected to the control components of the produced water output pipeline and the condensate output pipeline, the oil-water level gauge (2) and the output pump (3) respectively.

2. The condensate oil collection system in produced water from a gas field according to claim 1, characterized in that, The output end of the unloading pool (1) is located at the bottom of the unloading pool (1).

3. The condensate oil collection system in produced water from a gas field according to claim 1, characterized in that, The control component of the produced water output pipeline is a produced water electric ball valve (4). The control end of the produced water electric ball valve (4) is connected to the control system and is used to drive the produced water electric ball valve (4) through the control system to control the flow of produced water in the produced water output pipeline.

4. The condensate oil collection system in produced water from a gas field according to claim 1, characterized in that, An oil-water separator (9) is provided between the produced water output pipeline and the produced water regulating tank (11). The oil-water separator (9) is also provided with an oil output end, which is connected to the oil collection tank (10).

5. A condensate oil collection system for produced water from a gas field according to claim 1, characterized in that, The control components of the condensate oil output pipeline include a condensate oil electric ball valve (5) and a flow meter (6). The control terminals of the condensate oil electric ball valve (5) and the flow meter (6) are respectively connected to the control system, which is used to drive the condensate oil electric ball valve (5) to control the flow of condensate oil in the condensate oil output pipeline through the control system, and to detect the flow rate of condensate oil through the flow meter (6).

6. A condensate oil collection system for produced water from a gas field according to claim 1, characterized in that, The control components include a central control server (7) and a control platform (8). One end of the central control server (7) is connected to the control components of the produced water output pipeline and the condensate output pipeline, the oil-water level gauge (2) and the output pump (3), respectively, and the other end is connected to the control platform (8).

7. A condensate oil collection system for produced water from a gas field according to claim 6, characterized in that, The central control server (7) is equipped with a controller. The input end of the controller is connected to the output end of the signal input module. The input end of the signal input module is connected to the oil and water level gauge (2). The output end of the controller is connected to the input end of the signal output module. The output end of the signal output module is connected to the control components and output pump (3) of the produced water output pipeline and the condensate output pipeline, respectively. The control end of the controller is connected to the control platform (8).

8. A condensate oil collection system for produced water from a gas field according to claim 7, characterized in that, The output of the controller is also equipped with a human-machine interaction module for displaying the data transmitted by the oil-water level gauge (2).

9. A method for collecting condensate oil from produced water in a gas field, characterized in that, A gas field produced water condensate collection system according to any one of claims 1-8 includes the following process: The oil-water level gauge (2) is placed in the unloading pool (1). The oil-water level gauge (2) transmits the changes in the levels of produced water and condensate oil to the control system. When the control system displays that the changes in the levels of produced water and condensate oil transmitted by the oil-water level gauge (2) reach the produced water threshold, the control system sequentially controls the control components of the produced water output pipeline and the output pump (3) to open, so that the produced water in the unloading pool (1) passes through the output pump (3) and the produced water output pipeline to the produced water regulating tank (11). When the control system displays that the changes in the levels of produced water and condensate oil transmitted by the oil-water level gauge (2) reach the condensate oil threshold, the control system sequentially controls the closing of the produced water output pipeline and the opening of the control components of the condensate oil output pipeline and the output pump (3), so that the condensate oil in the unloading pool (1) passes through the output pump (3) and the condensate oil output pipeline to the receiving tank (10).

10. A method for collecting condensate oil from produced water in a gas field according to claim 9, characterized in that, The produced water in the produced water output pipeline undergoes secondary oil-liquid separation through an oil-water separator (9). The separated produced water is output to the produced water regulating tank (11), and the separated condensate oil is recovered into the oil collection tank (10).

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