Shale gas produced water gathering and transporting automation device

Abstract

The utility model discloses a shale gas produced water gathering and transportation automation device which comprises a separator electromagnetic valve, a PLC control cabinet, a power distribution frequency conversion cabinet and a water pump, a frequency converter is arranged in the power distribution frequency conversion cabinet, the PLC control cabinet is connected with the power distribution frequency conversion cabinet through a frequency converter signal line, and the power distribution frequency conversion cabinet is connected with the water pump through a water pump control line. The PLC control cabinet is connected with the separator electromagnetic valve through a separator electromagnetic valve signal line, the separation electromagnetic valve is arranged on the produced water pipeline, the water pumping pump is arranged on the produced water pipeline, and a produced water tank is arranged between the water pumping pump and the separation electromagnetic valve. The technical problems that in the prior art, manpower consumption is large, consumed time is long, and the environmental protection risk is large are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of produced water gathering and transportation in shale gas development, and in particular to an automated device for gathering and transportation of produced water in shale gas. Background Art

[0002] During the gas production process of shale gas wells, liquid is extracted from deep in the formation along with shale gas, which is called produced water. Produced water generally needs to be transported to a special treatment station and treated to meet the standards before it can be discharged. The daily produced water volume is affected by factors such as the number of gas wells in the gas production platform, the production stage of the gas wells, and the formation where they are located. Produced water has the environmental risk of polluting soil and water sources, so it is transported through a full-process closed pipeline. The gas gathering station needs to be equipped with the corresponding produced water pipeline process until it leaves the station and enters the produced water gathering and transportation network in the work area. The gas production platform is managed by a special gas production team. When the liquid level of the separator and produced water tank exceeds the upper limit, manual operation is required on site. Especially when the gas well is put into production and the amount of produced water is large, manual staff is required to be on duty at the separator 24 hours a day to prevent overflow.

[0003] At present, the produced water gathering and transportation equipment in shale gas development has the problems of high manpower consumption, long time consumption and high environmental risks. It is temporarily impossible to realize the automation and less-manned production of produced water gathering and transportation equipment. Utility Model Content

[0004] The utility model aims to provide an automated device for gathering and transporting produced water from shale gas, so as to solve the technical problems of high manpower consumption, long time consumption and high environmental risk in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides a shale gas produced water gathering and transportation automation device, including a separator solenoid valve, a PLC control cabinet, a power distribution frequency conversion cabinet and a water pump, wherein a frequency converter is placed inside the power distribution frequency conversion cabinet, the PLC control cabinet is connected to the power distribution frequency conversion cabinet through a frequency converter signal line, the power distribution frequency conversion cabinet is connected to the water pump through a water pump control line, the PLC control cabinet is connected to the separator solenoid valve through a separator solenoid valve signal line, the separation solenoid valve is arranged on the produced water pipeline, the water pump is arranged on the produced water pipeline, and a produced water tank is arranged between the water pump and the separation solenoid valve.

[0006] Furthermore, a start / stop knob, a frequency conversion / industrial frequency knob and a local / remote knob are installed on the power distribution frequency conversion cabinet by bolts, and the start / stop knob is connected to the PLC control cabinet through a start / stop signal line.

[0007] Furthermore, the water pump is connected to the outlet pipeline through a flange, the water pump and the produced water tank are connected through the produced water pipeline, the produced water tank is fixed on the produced water tank base by welding, the produced water tank level gauge is fixed on the produced water tank by welding, and the produced water tank level gauge is connected to the PLC control cabinet through the produced water tank level gauge signal line.

[0008] Furthermore, the produced water pipeline is a multi-way pipeline, and a separator and a gas production tree are also arranged on the produced water pipeline. The separator is connected to the produced water tank through the produced water pipeline, and the separator is connected to the gas production tree through the produced water pipeline.

[0009] Furthermore, the separator liquid level gauge is fixed on the separator by welding.

[0010] Based on the above technical solution, the utility model can produce the following beneficial effects:

[0011] The utility model provides an automated device for collecting and transporting produced water of shale gas. The utility model installs a separator solenoid valve on the produced water pipeline at the separator outlet, so that the separator solenoid valve can be automatically opened for drainage when the liquid level exceeds the upper limit. The utility model can adapt to the produced water volume in different production stages of the gas well, such as the initial, middle and final stages, and has strong adaptability.

[0012] By connecting the signals of the pumping pump, frequency converter, and power distribution frequency converter cabinet to the PLC control cabinet, the pumping pump can be automatically started to pump water when the liquid level in the produced water tank exceeds the upper limit, saving at least 30 minutes of pumping time for each well patrol.

[0013] The realization of the above functions reduces the labor intensity and time of the on-site gas production team, can adapt to the differences in the number of gas wells and the amount of produced water in different production stages, and realizes the automation of shale gas produced water gathering and transportation equipment in the gas gathering station. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a device of an embodiment of the utility model;

[0015] In the figure: 1. Gas tree; 2. Separator; 3. Separator level gauge; 4. Separator solenoid valve; 5. PLC control cabinet; 6. Power distribution frequency conversion cabinet; 7. Start / stop knob; 8. Frequency conversion / industrial frequency knob; 9. Local / remote knob; 10. Frequency converter; 11. Water pump control line; 12. Outbound pipeline; 13. Water pump; 14. Produced water tank level gauge; 15. Produced water tank base; 16. Produced water tank; 17. Frequency converter signal line; 18. Start / stop signal line; 19. Produced water tank level gauge signal line; 20. Separator level gauge signal line; 21. Separator solenoid valve signal line; 22. Produced water pipeline. DETAILED DESCRIPTION

[0016] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a shale gas produced water gathering and transportation automation device of the utility model in conjunction with the accompanying drawings.

[0017] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] like Figure 1 As shown, a shale gas produced water gathering and transportation automation device is characterized in that it includes a separator solenoid valve 4, a PLC control cabinet 5, a power distribution frequency conversion cabinet 6 and a water pump 13, wherein a frequency converter 10 is placed inside the power distribution frequency conversion cabinet 6, the PLC control cabinet 5 is connected to the power distribution frequency conversion cabinet 6 through a frequency converter signal line 17, the power distribution frequency conversion cabinet 6 is connected to the water pump 13 through a water pump control line 11, the PLC control cabinet 5 is connected to the separator solenoid valve 4 through a separator solenoid valve signal line 21, the separation solenoid valve 4 is arranged on a produced water pipeline 22, the water pump 13 is arranged on the produced water pipeline 22, and a produced water tank 16 is arranged between the water pump 13 and the separation solenoid valve 4.

[0019] A start / stop knob 7 , a frequency conversion / industrial frequency knob 8 and a local / remote knob 9 are installed on the power distribution frequency conversion cabinet 6 by bolts. The start / stop knob 7 is connected to the PLC control cabinet 5 via a start / stop signal line 18 .

[0020] The water pump 13 is connected to the outlet pipeline 12 through a flange, and the water pump 13 is connected to the produced water tank 16 through the produced water pipeline 22. The produced water tank 16 is fixed to the produced water tank base 15 by welding. The produced water tank level gauge 14 is fixed to the produced water tank 16 by welding. The produced water tank level gauge 14 is connected to the PLC control cabinet 5 through the produced water tank level gauge signal line 19.

[0021] The produced water pipeline 22 is a multi-way pipeline, and a separator 2 and a Christmas tree 1 are also provided on the produced water pipeline 22 . The separator 2 is connected to the produced water tank 16 through the produced water pipeline 22 , and the separator 2 is connected to the Christmas tree 1 through the produced water pipeline 22 .

[0022] The separator liquid level meter 3 is fixed on the separator 2 by welding. Example

[0023] A control method for a shale gas produced water gathering and transportation automation device, comprising two control steps: automatic sewage discharge from a separator and automatic water pumping from a produced water tank:

[0024] The steps of automatic sewage discharge of the separator are:

[0025] S11, setting the liquid level data range of the separator 2, and measuring the liquid level of the separator 2 by the separator liquid level meter 3;

[0026] S12, when the liquid level of separator 2 exceeds the upper limit, the separator solenoid valve 4 is opened; when the liquid level of separator 2 does not exceed the upper limit, the separator solenoid valve 4 is kept closed, and the work is finished;

[0027] S13, after the separator solenoid valve 4 is opened, the separator liquid level meter 3 determines whether the liquid level of the separator 2 decreases;

[0028] S14, when the liquid level of separator 2 drops, determine whether the liquid level of separator 2 exceeds the lower limit. When the liquid level of separator 2 does not drop, the system issues an early warning and notifies personnel to check on site whether the separator level gauge 3 or separator solenoid valve 4 is faulty. The work is finished;

[0029] S15, when the liquid level of separator 2 exceeds the lower limit, close the separator solenoid valve 4, and the work is finished; when the liquid level of separator 2 does not exceed the lower limit, return to S13, the cycle is 5s;

[0030] The steps of automatically pumping water from the produced water tank are as follows:

[0031] S21, setting the liquid level data range of the produced water tank 16, and measuring the liquid level of the produced water tank 16 by the water tank level gauge 14;

[0032] S22, when the liquid level of the produced water tank 16 exceeds the upper limit, the pumping pump 13 is started; when the liquid level of the produced water tank 16 does not exceed the upper limit, the pumping pump 13 is kept stopped, and the work is finished;

[0033] S23, after starting the water pump 13, judging whether the liquid level of the produced water tank 16 drops by the water tank level gauge 14;

[0034] S24, when the liquid level of the produced water tank 16 drops, determine whether the liquid level of the produced water tank 16 exceeds the lower limit. When the liquid level of the produced water tank 16 does not drop, stop the pump 13, issue a system warning, and notify personnel to conduct on-site inspection;

[0035] S25, when the liquid level of the produced water tank 16 exceeds the lower limit, stop the water pump 13 and the work is finished; when the liquid level of the produced water tank 16 does not exceed the lower limit, return to S13, the cycle is 5s;

[0036] Among them, after the liquid level of the produced water tank 16 in S22 exceeds the upper limit, the frequency of the inverter 10 is manually set, and the inverter 10 can automatically memorize the last set value.

[0037] Among them, the system warning in S24 notifies the personnel to conduct on-site inspection, and then rotates the local / remote knob 9 to the "local" position, and then checks the faults of the water tank level meter 14, the inverter 10, and the water pump 13.

[0038] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A shale gas produced water gathering and transportation automation device, characterized in that: The invention comprises a separator solenoid valve (4), a PLC control cabinet (5), a power distribution frequency conversion cabinet (6) and a water pump (13), wherein a frequency converter (10) is placed inside the power distribution frequency conversion cabinet (6), the PLC control cabinet (5) is connected to the power distribution frequency conversion cabinet (6) via a frequency converter signal line (17), the power distribution frequency conversion cabinet (6) is connected to the water pump (13) via a water pump control line (11), the PLC control cabinet (5) is connected to the separator solenoid valve (4) via a separator solenoid valve signal line (21), the separator solenoid valve (4) is arranged on a produced water pipeline (22), the water pump (13) is arranged on the produced water pipeline (22), and a produced water tank (16) is arranged between the water pump (13) and the separator solenoid valve (4).

2. The shale gas produced water gathering and transportation automation device according to claim 1, characterized in that: The power distribution frequency conversion cabinet (6) is provided with a start / stop knob (7), a frequency conversion / power frequency knob (8) and a local / remote knob (9) by means of bolts, and the start / stop knob (7) is connected to the PLC control cabinet (5) via a start / stop signal line (18).

3. The shale gas produced water gathering and transportation automation device according to claim 1, characterized in that: The pumping pump (13) is connected to the outlet pipeline (12) via a flange. The pumping pump (13) is connected to the produced water tank (16) via the produced water pipeline (22). The produced water tank (16) is fixed to the produced water tank base (15) by welding. The produced water tank level gauge (14) is fixed to the produced water tank (16) by welding. The produced water tank level gauge (14) is connected to the PLC control cabinet (5) via a produced water tank level gauge signal line (19).

4. The shale gas produced water gathering and transportation automation device according to claim 1, characterized in that: The produced water pipeline (22) is a multi-way pipeline. A separator (2) and a production tree (1) are also provided on the produced water pipeline (22). The separator (2) is connected to the produced water tank (16) via the produced water pipeline (22), and the separator (2) is connected to the production tree (1) via the produced water pipeline (22).

5. The shale gas produced water gathering and transportation automation device according to claim 4, characterized in that: The separator liquid level meter (3) is fixed to the separator (2) by welding.

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