Automatic shale oil gathering, transportation and water injection system

Abstract

The invention discloses a shale oil gathering and transportation and water injection automatic system which comprises shale oil incoming liquid, a first pipeline and a second pipeline are arranged on the downstream of the shale oil incoming liquid, a three-phase separator is arranged on the downstream of the first pipeline, a first stop valve is arranged on the first pipeline, and a second stop valve is arranged on the second pipeline. The three-phase separator comprises a separator inlet, a separator oil path outlet, a separator water path outlet and a separator gas path outlet, and an oil path liquid level meter and a water path liquid level meter are arranged on the three-phase separator. According to the system, accurate control, emergency disposal automation and real-time online monitoring of the running state of the gathering and transportation and water injection station are achieved, the running cost is reduced, operators are liberated from complicated work, potential safety hazards are found and treated in time, and the safety of the gathering and transportation and water injection station is improved.

Description

Technical Field

[0001] The invention relates to a shale oil production system, more specifically, to an automatic shale oil gathering, transportation and water injection system. Background Art

[0002] At present, after shale oil is mined, the existing technology is to simply separate the oil and gas through a skid-mounted oil and gas separator and then directly input it into the pipeline network. The downstream gathering and transportation station has large fluctuations in liquid volume and pressure, unstable associated gas volume, and high water content. As a result, the three-phase separator, water injection pump, storage tank, external transmission pump, and gathering and transportation pipeline of the gathering and transportation equipment often have inaccurate liquid level gauges, or sudden changes in pressure cause the three-phase separator and storage tank to overflow. During the production process, a certain number of operators need to be equipped for 24-hour on-site inspections, responsible for equipment data monitoring and recording, emergency disposal, manual control of equipment and device operating status, and adjustment of oilfield wastewater reinjection. However, the investment in human resources not only increases the cost of production and operation, but also the human operation cannot achieve real-time monitoring of the oil and gas gathering and transportation process, emergency disposal is not timely, work efficiency is low, and improper behavior and omissions of operators are prone to production safety and ecological environmental accidents. Summary of the invention

[0003] Based on this, it is necessary to provide an automatic shale oil gathering, transportation and water injection system to address the above technical issues.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A shale oil gathering, transportation and water injection automatic system, characterized in that the shale oil gathering, transportation and water injection automatic system comprises shale oil liquid, a first pipeline and a second pipeline are provided downstream of the shale oil liquid, a three-phase separator is provided downstream of the first pipeline, and a first cut-off valve is provided on the first pipeline. The three-phase separator comprises a separator inlet, a separator oil outlet, a separator water outlet and a separator gas outlet. The three-phase separator is provided with an oil level gauge and a water level gauge. The separator gas outlet is connected to the gas generator via the fifth pipeline and the sixth pipeline, and the separator gas outlet is connected to the gas pipeline via the fifth pipeline and the seventh pipeline. The sixth pipeline is provided with a relief valve, and the seventh pipeline is provided with a gas flow meter and a seventh regulating valve. The separator oil outlet is connected to the 1# external delivery pump and the 2# external delivery pump via the third pipeline. The third pipeline is provided with an oil flow meter and a third regulating valve. The separator water outlet is connected to the buffer tank through the fourth pipeline, the fourth pipeline is provided with a water flow meter and a fourth regulating valve, the buffer tank outlet is connected to the 1# water feeding pump and the 2# water feeding pump through the tenth pipeline, the buffer tank is provided with a buffer level meter, the 1# water feeding pump and the 2# water feeding pump are connected to the 1# water injection pump and the 2# water injection pump through the twelfth pipeline, The inlet of the first shut-off valve is connected to the 1# emergency tank and the 2# emergency tank via the eighth pipeline, and the eighth pipeline is provided with a liquid inlet quick-opening valve. The outlet of the third regulating valve is connected to the 1# emergency tank and the 2# emergency tank via the ninth pipeline, and the ninth pipeline is provided with an oil circuit quick-opening valve. The 1# emergency tank and the 2# emergency tank are interconnected, and the 1# emergency tank is connected to the oil recovery pump. The 2# emergency tank is connected to the 1# water feeding pump via the eleventh pipeline. The outlet of the fourth regulating valve merges with the ninth pipeline via the twelfth pipeline, and the twelfth pipeline is provided with a water circuit quick-opening valve. The shale oil gathering and water injection automatic system also includes an external transmission pump control cabinet, a water injection control cabinet and a PLC control cabinet. in, The PLC control cabinet is connected to the water injection control cabinet through a first connecting cable, the water injection control cabinet is connected to the buffer level meter through a second connecting cable, the external transfer pump control cabinet is connected to the buffer level meter through a third connecting cable, the external transfer pump control cabinet is connected to the 1# external transfer pump and the 2# external transfer pump through a fourth connecting cable, the PLC control cabinet is connected to the water circuit quick opening valve through a fifth connecting cable, the PLC control cabinet is connected to the oil circuit quick opening valve through a sixth connecting cable, the PLC control cabinet is connected to the liquid inlet quick opening valve through a seventh connecting cable, the PLC control cabinet is connected to the first cut-off valve through an eighth connecting cable, and the PLC control cabinet is connected to the relief valve through a ninth connecting cable.

[0005] As a preferred embodiment of the present invention, the buffer level meter includes a radar level meter and a pressure level meter, the pressure level meter serves as an output control signal of the buffer tank level, and the radar level meter serves as a calibration signal.

[0006] As a preferred embodiment of the present invention, the shale oil gathering, transportation and water injection automatic system also includes a UPS power supply.

[0007] As a preferred embodiment of the present invention, the shale oil gathering, transportation and water injection automatic system also includes a remote control unit.

[0008] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an automatic system for shale oil gathering, transportation and water injection, which can realize precise control of the operating status of gathering, transportation and water injection stations, automatic emergency disposal, real-time online monitoring, reduce operating costs, free operators from complicated work, timely discover and deal with potential safety hazards, and improve the safety of gathering, transportation and water injection stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the scheme of the present invention, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 It is a structural schematic diagram of the shale oil gathering, transportation and water injection automatic system of the present invention. DETAILED DESCRIPTION

[0011] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0012] like Figure 1 As shown, the shale oil gathering and water injection automatic system includes shale oil liquid S, a first pipeline P1 and a second pipeline P2 are provided downstream of the shale oil liquid S, a three-phase separator 1 is provided downstream of the first pipeline P1, and a first shut-off valve P110 is provided on the first pipeline P1.

[0013] The three-phase separator 1 comprises a separator inlet 11, a separator oil circuit outlet 12, a separator water circuit outlet 13 and a separator gas circuit outlet 14. In addition, an oil circuit level gauge 1A and a water circuit level gauge 1B are provided on the three-phase separator 1. The oil circuit level gauge 1A is used to monitor the liquid level of the oil circuit inside the three-phase separator 1. The water circuit level gauge 1B is used to monitor the liquid level of the water circuit inside the three-phase separator 1.

[0014] The separator gas outlet 14 is connected to the gas generator 3 via the fifth pipeline P5 and the sixth pipeline P6, and the separator gas outlet 14 is connected to the gas transmission pipeline 4S via the fifth pipeline P5 and the seventh pipeline P7. The sixth pipeline P6 is provided with a relief valve P61, and the seventh pipeline P7 is provided with a gas flow meter P71 and a seventh regulating valve P72.

[0015] The separator oil outlet 12 is connected to the 1# external delivery pump 4 and the 2# external delivery pump 5 via the third pipeline P3. The third pipeline P3 is provided with an oil flow meter P31 and a third regulating valve P32.

[0016] The separator water outlet 13 is connected to the buffer tank 2 through the fourth pipeline P4, and the fourth pipeline P4 is provided with a water flow meter P41 and a fourth regulating valve P42. The outlet of the buffer tank 2 is connected to the 1# water feeding pump 9 and the 2# water feeding pump 10 through the tenth pipeline P10. A buffer level meter 21 is provided in the buffer tank 2. The 1# water feeding pump 9 and the 2# water feeding pump 10 are connected to the 1# water injection pump 11 and the 2# water injection pump 12 through the twelfth pipeline P12.

[0017] The inlet of the first shut-off valve P110 is connected to the 1# emergency tank 6 and the 2# emergency tank 7 via the eighth pipeline P8, and the eighth pipeline P8 is provided with a liquid inlet quick-opening valve P81. The outlet of the third regulating valve P32 is connected to the 1# emergency tank 6 and the 2# emergency tank 7 via the ninth pipeline P9, and the ninth pipeline P9 is provided with an oil circuit quick-opening valve P91. The 1# emergency tank 6 and the 2# emergency tank 7 are interconnected, the 1# emergency tank 6 is connected to the oil recovery pump 8, and the 2# emergency tank 7 is connected to the 1# water feeding pump 9 via the eleventh pipeline P11.

[0018] The outlet of the fourth regulating valve P42 is connected to the ninth pipeline P9 through the twelfth pipeline P12, and the twelfth pipeline P12 is provided with a water channel quick-opening valve P121.

[0019] It should be noted that the oil circuit quick-opening valve P91 is controlled by the dual liquid level of the oil chamber pressure differential level gauge and the magnetic flap level gauge of the three-phase separator 1. The oil circuit quick-opening valve P91 opens the oil circuit to discharge liquid into the 1# emergency tank 6 and the 2# emergency tank 7.

[0020] The water circuit quick-opening valve P121 is controlled by the water chamber pressure differential level gauge and magnetic flap level gauge of the three-phase separator 1 and the liquid level of the buffer tank 2. The water circuit quick-opening valve P121 opens liquid to enter the 1# emergency tank 6 and the 2# emergency tank 7.

[0021] The liquid inlet quick-opening valve P81 is controlled by the incoming liquid pipeline pressure to open the wellhead to allow the incoming liquid to enter the 1# emergency tank 6 and the 2# emergency tank 7.

[0022] The shale oil gathering and water injection automatic system also includes an external transmission pump control cabinet 13 , a water injection control cabinet 14 and a PLC control cabinet 15 .

[0023] The PLC control cabinet 15 is connected to the water injection control cabinet 14 through the first connecting cable K1, and the water injection control cabinet 14 is connected to the buffer level meter 21 through the second connecting cable K2. The external transfer pump control cabinet 13 is connected to the buffer level meter 21 through the third connecting cable K3, and the external transfer pump control cabinet 13 is connected to the 1# external transfer pump 4 and the 2# external transfer pump 5 through the fourth connecting cable K4. The PLC control cabinet 15 is connected to the water circuit quick-opening valve P121 through the fifth connecting cable K5, and the PLC control cabinet 15 is connected to the oil circuit quick-opening valve P91 through the sixth connecting cable K6. The PLC control cabinet 15 is connected to the liquid inlet quick-opening valve P81 through the seventh connecting cable K7. The PLC control cabinet 15 is connected to the first shut-off valve P110 through the eighth connecting cable K8, and the PLC control cabinet 15 is connected to the relief valve P61 through the ninth connecting cable K9.

[0024] In addition, the shale oil gathering, transportation and water injection automatic system also includes a UPS power supply 16 and a remote control unit 17.

[0025] The working mode of the shale oil gathering, transportation and water injection automatic system is explained below.

[0026] When the oil level in the oil circuit continues to rise to the set alarm value, the on-site and remote alarms are sounded simultaneously, and the PLC control cabinet 15 reads that the input value of the oil circuit level gauge 1A exceeds the set value, and the oil circuit quick-opening valve P91 is opened, and the oil circuit outlet enters the 1# emergency tank 6 and 2# emergency tank 7. The switch of the oil circuit quick-opening valve P91 can be automatically opened and closed according to the set value of the oil circuit level gauge. The oil circuit quick-opening valve P91 can also switch between two modes to control the valve switch locally and remotely. Its main function is to prevent the separator from flooding, crude oil leakage, and oil leakage from the associated gas pipeline, which may cause production accidents.

[0027] When the input value of the buffer level meter 21 in the buffer tank 2 exceeds the set value or the water level continues to rise to the set alarm value, the on-site and remote alarms are triggered simultaneously. The PLC control cabinet 15 reads that the input values ​​of the water level meter 1B and the buffer level meter 21 exceed the set value, and the on-site and remote alarms are triggered simultaneously. At the same time, the water quick-opening valve P121 is opened, so the water outlet enters the 1# emergency tank 6 and the 2# emergency tank 7. The water quick-opening valve P121 can be interlocked and controlled according to the water level meter 1B and the buffer level meter 21, and can be set to open and close automatically. This valve can also switch between two modes locally and remotely to control the valve switch. Its main function is to prevent the water injection pump system from malfunctioning and the separator waterway from being abnormal, causing the buffer tank and separator to overflow and cause a safety accident.

[0028] When the operating pressure of the three-phase separator 1 continues to rise to the set alarm value of 0.5MPa, the on-site and remote alarms are triggered simultaneously. The PLC control cabinet 15 reads that the input value of the pressure sensor inside the three-phase separator 1 exceeds the set value, and the liquid inlet quick-opening valve P81 is opened, and the total liquid enters the emergency tank, reducing the operating pressure of the three-phase separator 1. When the emergency tank liquid reaches 60%, an automatic alarm is triggered to prevent the tank from overflowing. The switch of the liquid inlet quick-opening valve P81 can be automatically opened and closed according to the set value of the total liquid pressure. This valve can also switch between two modes, local and remote, to control the valve switch. Its main function is to protect the stable operation of the separator and prevent the safety valve from opening due to overpressure, causing damage and pollution to the equipment and environment.

[0029] When the three-phase separator 1 cannot operate due to leakage, blockage, etc., the local or remote control unit 17 can control the liquid inlet quick-opening valve P81 to open, and the total liquid enters the 1# emergency tank 6 and the 2# emergency tank 7. The first shut-off valve P110 is closed, and the total liquid no longer enters the three-phase separator 1. It should be noted that the first shut-off valve P110 and the liquid inlet quick-opening valve P81 are interlocked. The opening of the liquid inlet quick-opening valve P81 takes precedence over the first shut-off valve P110. When the liquid inlet quick-opening valve P81 is in the fully open state, the first shut-off valve P110 intervenes in the closing operation. The interlocking valve can also switch between two modes to control the valve switch locally and remotely. Its main function is to cut off the three-phase separator 1 in time when the three-phase separator 1 is abnormal and cannot operate normally, so as to prevent accidents.

[0030] The relief valve P61 is controlled by the PLC control cabinet 15 according to the on-site associated gas pipeline pressure sensor to detect the opening degree of the pipeline pressure automatic regulating valve. When the pressure reaches the set value, the relief valve P61 opens to output the associated gas.

[0031] The function of the buffer tank 2 is further described below.

[0032] The buffer level gauge 21 of the buffer tank 2 includes a radar level gauge and a pressure level gauge, which monitors the liquid level of the buffer tank and controls the operating frequency of the water injection pump. Among them, the liquid level fluctuation selects a single flange pressure level gauge as the output control signal of the buffer tank liquid level, and the radar level gauge on the top is used as the calibration signal. Two independent sensors measure the liquid level at the same time, which can double-check the liquid level. The data of the dual level gauges is transmitted to the PLC control cabinet 15. In the dual monitoring mode, the problem of large fluctuations in the liquid level display and display value errors caused by the liquid inflow of the buffer tank can be solved.

[0033] The buffer tank 2 is provided with three control modes: oil collection mode, medium liquid level mode and low liquid level mode. When the liquid level of the buffer tank 2 rises or falls, the pressure level gauge detects the pressure change caused by the liquid surface, converts it into a DC4mA~20mA current and transmits it to the PID controller of the water injection pump control cabinet 14. The water injection pump control cabinet 14 compares the given value with the feedback value and outputs it to the frequency converter and adds it to the control terminal as a control signal. The frequency converter changes the speed of the 1# water injection pump 11 and the 2# water injection pump 12 by changing the output voltage and frequency, thereby controlling the water injection displacement. In this way, a closed-loop control system is formed by the liquid level of the buffer tank 2 and the pump displacement of the 1# water injection pump 11 and the 2# water injection pump 12, so as to stabilize the liquid height of the buffer tank and realize the automatic frequency conversion of the 1# water injection pump 11 and the 2# water injection pump 12.

[0034] The primary and secondary alarm systems for low and high liquid levels of the buffer tank 2 can be set through the PLC control cabinet 15 .

[0035] When the first level alarm is triggered (the low liquid level tank volume is 30% and the high liquid level tank volume is 70%), local and remote alarms are triggered simultaneously, and the responsible shift station arranges emergency personnel to investigate the cause of the fault on site.

[0036] In the second level alarm: 1. When the volume of the high liquid level tank is 80%, the water circuit quick-opening valve P121 opens, and the water circuit outlet of the three-phase separator 1 enters the emergency tank to avoid the buffer tank from overflowing. 2. When the volume of the low liquid level tank is 15%, the 1# injection pump 11 and the 2# injection pump 12 automatically stop the pump to protect the injection pump from dry grinding damage due to lack of liquid. At the same time, the water injection system monitoring can set local and remote monitoring of abnormal operation alarms such as overpressure, low pressure, and fault stop of water injection equipment. The local and remote emergency pump stop processing can be carried out on abnormal equipment to realize the automatic control interlocking operation of the water injection system.

[0037] This invention has been put into use in the 190 station area of ​​Caoshe field inspection team of Taizhou Oil Production Plant of East China Oil and Gas Branch. At present, the station area is responsible for the crude oil boosting of 6 shale oil wells such as Hong 201 Slope and Hongye 201-2 Platform and Tainan Block, with a daily processing capacity of nearly 1,000 cubic meters. The station area has achieved full automation control and no one is stationed. The automation application of the 190 station area reduces the dependence of the station on human resources and improves work efficiency. The shutdown of the Hongzhuang booster screw pump saves the energy consumption and pump consumables of the booster pump, and reduces the Tainan-Caoshe-Zhoucheng crude oil gathering and transportation operation load. It realizes precise control of the operating status of the gathering and transportation and water injection stations, automated emergency response, real-time online monitoring, and reduced operating costs, freeing operators from complicated work, timely discovering and handling safety hazards, and improving the safety of gathering and transportation and water injection stations.

[0038] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. A shale oil gathering, transportation and water injection automatic system, characterized in that: The shale oil gathering and water injection automatic system comprises shale oil liquid (S), a first pipeline (P1) and a second pipeline (P2) are provided downstream of the shale oil liquid (S), a three-phase separator (1) is provided downstream of the first pipeline (P1), and a first shut-off valve (P110) is provided on the first pipeline (P1). The three-phase separator (1) comprises a separator inlet (11), a separator oil outlet (12), a separator water outlet (13) and a separator gas outlet (14). The three-phase separator (1) is provided with an oil level gauge (1A) and a water level gauge (1B). The separator gas path outlet (14) is connected to the gas generator (3) via a fifth pipeline (P5) and a sixth pipeline (P6); the separator gas path outlet (14) is connected to the gas transmission pipeline (4S) via a fifth pipeline (P5) and a seventh pipeline (P7); a relief valve (P61) is provided on the sixth pipeline (P6); and a gas path flow meter (P71) and a seventh regulating valve (P72) are provided on the seventh pipeline (P7). The separator oil circuit outlet (12) is connected to the 1# external delivery pump (4) and the 2# external delivery pump (5) via the third pipeline (P3). The third pipeline (P3) is provided with an oil circuit flow meter (P31) and a third regulating valve (P32). The separator water outlet (13) is connected to the buffer tank (2) via a fourth pipeline (P4); the fourth pipeline (P4) is provided with a water flow meter (P41) and a fourth regulating valve (P42); the outlet of the buffer tank (2) is connected to the 1# water feeding pump (9) and the 2# water feeding pump (10) via a tenth pipeline (P10); a buffer level meter (21) is provided in the buffer tank (2); the 1# water feeding pump (9) and the 2# water feeding pump (10) are connected to the 1# water injection pump (11) and the 2# water injection pump (12) via a twelfth pipeline (P12); The inlet of the first shut-off valve (P110) is connected to the 1# emergency tank (6) and the 2# emergency tank (7) via the eighth pipeline (P8), and the eighth pipeline (P8) is provided with a liquid inlet quick-opening valve (P81). The outlet of the third regulating valve (P32) is connected to the 1# emergency tank (6) and the 2# emergency tank (7) via the ninth pipeline (P9), and the ninth pipeline (P9) is provided with an oil circuit quick-opening valve (P91). The 1# emergency tank (6) and the 2# emergency tank (7) are interconnected, the 1# emergency tank (6) is connected to the oil recovery pump (8), and the 2# emergency tank (7) is connected to the 1# water feeding pump (9) via the eleventh pipeline (P11). The outlet of the fourth regulating valve (P42) is connected to the ninth pipeline (P9) via the twelfth pipeline (P12), and the twelfth pipeline (P12) is provided with a water circuit quick-opening valve (P121). The shale oil gathering and water injection automatic system further comprises an external transmission pump control cabinet (13), a water injection control cabinet (14) and a PLC control cabinet (15). in, The PLC control cabinet (15) is connected to the water injection control cabinet (14) via a first connecting cable (K1), the water injection control cabinet (14) is connected to the buffer level meter (21) via a second connecting cable (K2), the external transfer pump control cabinet (13) is connected to the buffer level meter (21) via a third connecting cable (K3), the external transfer pump control cabinet (13) is connected to the 1# external transfer pump (4) and the 2# external transfer pump (5) via a fourth connecting cable (K4), and the PLC control cabinet (15) is connected to the 5# external transfer pump (15) via a fifth connecting cable (K6). The connecting cable (K5) is connected to the water circuit quick-opening valve (P121), the PLC control cabinet (15) is connected to the oil circuit quick-opening valve (P91) through the sixth connecting cable (K6), the PLC control cabinet (15) is connected to the liquid inlet quick-opening valve (P81) through the seventh connecting cable (K7), the PLC control cabinet (15) is connected to the first shut-off valve (P110) through the eighth connecting cable (K8), and the PLC control cabinet (15) is connected to the relief valve (P61) through the ninth connecting cable (K9).

2. The shale oil gathering, transportation and water injection automatic system according to claim 1 is characterized in that: The buffer level gauge (21) comprises a radar level gauge and a pressure level gauge, the pressure level gauge being used as an output control signal of the buffer tank liquid level, and the radar level gauge being used as a calibration signal.

3. The shale oil gathering, transportation and water injection automatic system according to claim 1 is characterized in that: The shale oil gathering, transportation and water injection automatic system also includes a UPS power supply (16).

4. The shale oil gathering, transportation and water injection automatic system according to claim 1 is characterized in that: The shale oil gathering, transportation and water injection automatic system further comprises a remote control unit (17).

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