A control system for a three-phase separator

Abstract

The utility model discloses a control system for a three-phase separator, including a separation tank, an oil-water interface controller arranged in the separation tank, the separation tank is provided with an inlet pipeline connected to an oil-liquid mixing zone, an oil outlet pipeline connected to an oil zone, and a water outlet pipeline connected to the oil-water interface controller and a water zone, the oil outlet pipeline is provided with an oil-water online analyzer I for detecting the oil-water ratio, and the water outlet pipeline is provided with an oil-water online analyzer II for detecting the oil-water ratio; a PLC control system, the PLC control system is connected to the oil-water interface controller, the oil-water online analyzer I and the oil-water online analyzer II. Through this technical solution, the transmission and distribution of the oil-water pipeline can be realized by automatically controlling the electric oil-water interface regulator, so as to automatically adjust and separate the oil and water.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and natural gas separation, in particular to a control system of a three-phase separator. Background Art

[0002] In the process of oil and natural gas extraction, after extraction, this high-pressure mixture needs to be initially separated and transported using a three-phase separator. During the separation and output process, the separated oil and water need to be transported to different production units respectively. Generally, the amount of oil and water produced by a new well is repeatedly adjusted by the amount of oil and water produced in the initial use until the output oil and water content meets the standard. However, in actual operation, due to the ever-changing underground conditions, the amount of oil, water and gas is uneven. The same well may produce very different amounts of oil, water and gas at different times. The water content of the oil pipeline may exceed the standard, seriously affecting the next process, or the oil content of the water pipeline may be too high, resulting in oil waste.

[0003] On November 5, 2019, a Chinese patent document published an intelligent oil-water interface adjustment device for a three-phase separator. The patent publication number is CN211189201U. In this solution, one end of the water weir pipe is connected to the sedimentation chamber of the three-phase separator body, and the other end of the water weir pipe passes through the oil chamber of the three-phase separator body and is arranged in the water chamber of the three-phase separator body. The water weir pipe port in the water chamber is connected to the interface regulator, which can adjust the height of the water weir pipe. An oil flow meter is provided on the oil outlet pipeline of the oil chamber, and a water flow meter is provided on the water outlet pipeline of the water chamber. The oil flow meter and the water flow meter are connected to one end of the PLC control system, and the other end of the PLC control system is connected to the interface regulator. By adding an intelligent adjustment device for the oil-water interface to the three-phase separator, the oil and water can be separated intelligently and efficiently, thereby improving the separation effect of the three-phase separator.

[0004] Specifically, the solution is to detect the amount of oil and water output through an oil flow meter and a water flow meter, and feed back to the PLC control system. The PLC control system issues instructions to adjust the rotation of the servo motor to realize the rotation of the screw. The overflow height of the water weir pipe is adjusted by the screw, thereby adjusting the oil-water interface height in the three-phase separator.

[0005] However, according to the changes in the underground components, the height of the oil layer is different. When the water content in the oil exceeds the standard, the excessive amount of water causes the oil level to rise, and the oil-water layer enters the oil tank. In another case where the oil content in the water exceeds the standard, the water volume is too small, causing the oil to enter the water layer, and the oil layer enters the water tank. For this reason, it is necessary to propose a method that can be combined with a PLC control system according to the oil-water ratio of the liquid in the output pipeline and the electric oil-water interface regulator on the separation tank to automatically adjust and separate the oil and water. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art that the oil and water cannot be automatically adjusted and automatically distributed when the components of the ground are changed, the utility model provides a control system for a three-phase separator. Through this technical solution, the distribution of the oil and water pipeline can be realized by automatically controlling the electric oil-water interface regulator, thereby automatically adjusting and separating the oil and water, indirectly changing the thickness of the oil layer, and changing the height of the oil-water interface, ensuring the normal oil and water output of the separator.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions: a control system for a three-phase separator, comprising a separation tank, an oil-water interface controller arranged in the separation tank, the separation tank is provided with an inlet pipeline connected to an oil-liquid mixing zone, an oil outlet pipeline connected to an oil zone, and a water outlet pipeline connected to the oil-water interface controller and a water zone, the oil outlet pipeline is provided with an oil-water online analyzer I for detecting the oil-water ratio, and the water outlet pipeline is provided with an oil-water online analyzer II for detecting the oil-water ratio;

[0008] A PLC control system is connected to an oil-water interface controller, an oil-water online analyzer I and an oil-water online analyzer II.

[0009] Furthermore, a liquid level transmitter I is provided in the oil area, an oil circuit regulating valve is also provided on the oil outlet pipeline, and the PLC control system connects the liquid level transmitter I and the oil circuit regulating valve.

[0010] Furthermore, a vortex flowmeter is provided between the liquid inlet of the oil outlet pipeline and the oil circuit regulating valve, and a ball valve I is provided between the oil circuit regulating valve and the liquid outlet of the oil outlet pipeline.

[0011] Furthermore, a liquid level transmitter II is provided in the water area, a water circuit regulating valve is also provided on the water outlet pipeline, and the PLC control system is connected to the liquid level transmitter I and the water circuit regulating valve.

[0012] Furthermore, an electromagnetic flowmeter is provided between the liquid inlet of the water outlet pipeline and the water circuit regulating valve, and a ball valve II is provided between the water circuit regulating valve and the liquid outlet of the water outlet pipeline.

[0013] Furthermore, a pressure transmitter I is provided on the separation tank, an air outlet pipeline is provided on the top of the separation tank, an air path regulating valve is provided on the air outlet pipeline, and the PLC control system is connected to the pressure transmitter I and the air path regulating valve.

[0014] Furthermore, a swirl flowmeter is provided between the air inlet of the air outlet pipeline and the air circuit regulating valve, a ball valve III is provided between the air circuit regulating valve and the air outlet of the air outlet pipeline, a pressure transmitter II is provided between the air circuit regulating valve and the ball valve, the PLC control system is connected to the pressure transmitter I, the pressure transmitter II and the air circuit regulating valve, and a ball valve IV is provided on the inlet pipeline.

[0015] Furthermore, it also includes a gas leakage alarm. The top of the separation tank is provided with an exhaust pipeline connected to the inner cavity of the separation tank. A safety valve and a ball valve V are provided on the exhaust pipeline. The PLC control system is connected to the gas leakage alarm.

[0016] Furthermore, a sewage pipeline is provided at the bottom of the separation tank, and a sewage valve is provided on the sewage pipeline.

[0017] Furthermore, the oil-water interface controller includes a coaxially arranged outer sleeve, an inner sleeve, an adjusting sleeve, and a valve stem lifting assembly adjusting actuator. The bottom end of the outer sleeve is sealed and connected to the outer wall of the inner sleeve to form a water outlet chamber and an air balance chamber located above the water outlet chamber. The adjusting sleeve is located on the inner side of the inner sleeve and cooperates with the axial clearance of the inner sleeve. An overflow port is provided at the upper end of the adjusting sleeve, and the upper end of the adjusting sleeve is connected to the valve stem lifting assembly so that the adjusting sleeve can rise or fall axially relative to the water outlet chamber of the inner sleeve. A passage is formed between the outer sleeve, the inner sleeve and the adjusting sleeve through the water inlet chamber, the overflow port and the water outlet chamber. The adjusting actuator is transmission-connected to the valve stem lifting assembly, and the PLC control system is connected to the adjusting actuator.

[0018] In summary, the utility model has the following beneficial effects:

[0019] (1) When the reservoir composition changes greatly, including when the water content in the oil exceeds the standard, according to the oil-water interface regulation principle, the entire process is based on the feedback signal of the oil-water online analyzer in the oil outlet pipeline. After the PLC control system makes a judgment, it commands the oil-water interface controller to move downward for a distance to control the oil level within a certain height range; when the oil content in the water exceeds the standard, according to the oil-water interface regulation principle, the entire process is based on the feedback signal of the oil-water online analyzer in the water outlet pipeline. After the PLC control system makes a judgment, it commands the oil-water interface controller to move upward for a distance to control the oil level within a certain height range. The real-time feedback signal of the online water content analyzer on the oil-water pipeline commands the oil-water interface controller to adjust the oil-water interface height, thereby indirectly changing the oil layer thickness and the oil-water interface height, thereby ensuring the normal oil and water output of the separator.

[0020] (2) When the oil-water interface controller is adjusted downward by the PLC control system, the PLC control system controls the oil circuit regulating valve to lower or close the opening according to the feedback signal. At this time, the oil zone gradually accumulates oil, and after repeated adjustments, a stable oil product is output; when the oil-water interface controller is adjusted upward by the PLC control system, the PLC control system controls the water circuit regulating valve to lower or close the opening according to the feedback signal. At this time, the water zone gradually accumulates water, and after repeated adjustments, a stable water product is output.

[0021] (3) Since the medium is flammable and the separator is a pressure vessel, if the incoming gas pressure is too high, it can be relieved through the safety valve; if a leak occurs on site, the signal will be transmitted to the control system through the gas leak alarm, and an audible and visual alarm will be generated, and the alarm signal will be transmitted to the main control room. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the control system structure of the three-phase separator.

[0023] Figure 2 It is a schematic diagram of the three-phase separator structure.

[0024] Figure 3 Schematic diagram of the oil-water interface controller structure.

[0025] The accompanying drawings are described as follows:

[0026] 1. Separation tank; 11. Oil weir; 12. Water weir plate; 13. Inlet pipeline; 131. Ball valve IV; 14. Oil outlet pipeline; 141. Oil-water online analyzer I; 142. Oil circuit regulating valve; 143. Vortex flowmeter; 144. Ball valve I; 15. Water outlet pipeline; 151. Oil-water online analyzer II; 152. Water circuit regulating valve; 153. Electromagnetic flowmeter; 154. Ball valve II; 16. Pressure transmitter I; 17. Gas outlet pipeline; 171. Swirl vortex flowmeter; 172. Gas circuit regulating valve; 173. Ball valve III; 174. Pressure transmitter II; 18. Exhaust pipeline; 181. Safety valve; 182. Ball valve V; 19. Drain pipeline; 191. Drain valve; 2. Oil-liquid mixing area; 3. Oil area; 31. Liquid level transmitter I; 4. Water area; 41. Liquid level transmitter II; 5. Oil-water interface controller; 51. Outer sleeve; 511. Water outlet chamber; 52. Inner sleeve; 521. Water inlet chamber; 53. Adjusting cylinder; 531. Gas balance chamber; 532. Overflow chamber; 533. Overflow port; 54. Valve stem lifting assembly; 55. Adjusting actuator; 6. PLC control system; 7. Gas leak alarm. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the embodiments.

[0028] Embodiment 1:

[0029] like Figure 1As shown, a control system of a three-phase separator includes a separation tank 1, an oil-water interface controller 5 arranged in the separation tank 1, an inlet pipeline 13 connected to the oil-liquid mixing area 2, an oil outlet pipeline 14 connected to the oil area 3, and a water outlet pipeline 15 connected to the oil-water interface controller 5 and the water area 4, the oil outlet pipeline 14 is provided with an oil-water online analyzer I141 for detecting the oil-water ratio, and the water outlet pipeline 15 is provided with an oil-water online analyzer II151 for detecting the oil-water ratio; a PLC control system 6, the PLC control system 6 is connected to the oil-water interface controller 5, the oil-water online analyzer I141 and the oil-water online analyzer II151. The PLC control system 6 is combined with the oil-water online analyzer I141 on the oil outlet pipeline 14 and the oil-water online analyzer II151 on the water outlet pipeline 15, and the electric oil-water interface controller 5 on the separation tank 1 to perform automatic oil-water adjustment separation.

[0030] When oil and water are transported through the oil outlet pipeline 14 and the water outlet pipeline 15 respectively, the oil-water online analyzer detects whether the oil-water ratio is within the normal range. If the water content in the oil exceeds the standard, the PLC control system 6 commands the oil-water interface controller 5 to move downward for a distance after judgment, and controls the oil level within a certain height range; when the oil content in the water exceeds the standard, the PLC control system 6 commands the oil-water interface controller 5 to move upward for a distance after judgment, and controls the oil level within a certain height range. The real-time feedback signal of the online water content analyzer on the oil-water pipeline commands the oil-water interface controller 5 to adjust the oil-water interface height, thereby indirectly changing the oil layer thickness and the oil-water interface height, and ensuring the normal oil and water output of the separator.

[0031] Embodiment 2:

[0032] like Figure 1 As shown, based on a control system of a three-phase separator in Example 1, a liquid level transmitter 131 is provided in the oil area 3, an oil circuit regulating valve 142 is also provided on the oil outlet pipeline 14, and a PLC control system 6 connects the liquid level transmitter 131 and the oil circuit regulating valve 142. A vortex flowmeter 143 is provided between the liquid inlet of the oil outlet pipeline 14 and the oil circuit regulating valve 142, and a ball valve 1144 is provided between the oil circuit regulating valve 142 and the liquid outlet of the oil outlet pipeline 14.

[0033] During implementation, a liquid level transmitter II41 is provided in the water zone 4, a water circuit regulating valve 152 is also provided on the water outlet pipeline 15, and the PLC control system 6 is connected to the liquid level transmitter I31 and the water circuit regulating valve 152. An electromagnetic flowmeter 153 is provided between the liquid inlet of the water outlet pipeline 15 and the water circuit regulating valve 152, and a ball valve II154 is provided between the water circuit regulating valve 152 and the liquid outlet of the water outlet pipeline 15.

[0034] Oil circuit, when the position of oil zone 3 or oil tank meets the requirement, through the position indicator level transmitter I31 set in the oil tank, the oil enters the pipeline through the oil discharge port on the container and passes through the vortex flowmeter 143, oil circuit regulating valve 142, oil-water online analyzer I141 and ball valve I144 in turn. Under the control of the control system, the level transmitter and the regulating valve are linked to output the oil, and the oil level is stabilized within a height range through the opening of the regulating valve. At the same time, the oil-water online analyzer I141 detects whether the oil-water ratio is within the normal range.

[0035] Water circuit, when the position of water zone 4 or water tank meets the requirement, the water enters the pipeline through the drain port on the container through the position indicator liquid level transmitter II41 set on the water tank, and passes through the electromagnetic flowmeter 153, water circuit regulating valve 152, oil-water online analyzer II151 and ball valve II154 in sequence. Under the control of the PLC control system 6, the liquid level transmitter II41 and the regulating valve are linked to output water, and the oil level is stabilized within a height range through the opening of the regulating valve. At the same time, the oil-water online analyzer II151 detects whether the oil-water ratio is within the normal range.

[0036] Embodiment 3:

[0037] like Figure 1 As shown, based on a control system of a three-phase separator in Example 1, a pressure transmitter I16 is provided on the separation tank 1, an air outlet pipeline 17 is provided on the top of the separation tank 1, an air circuit regulating valve 172 is provided on the air outlet pipeline 17, and a PLC control system 6 is connected to the pressure transmitter I16 and the air circuit regulating valve 172. A swirl flowmeter 171 is provided between the air inlet of the air outlet pipeline 17 and the air circuit regulating valve 172, a ball valve III173 is provided between the air circuit regulating valve 172 and the air outlet of the air outlet pipeline 17, a pressure transmitter II174 is provided between the air circuit regulating valve 172 and the ball valve, the PLC control system 6 is connected to the pressure transmitter I16, the pressure transmitter II174 and the air circuit regulating valve 172, and a ball valve IV131 is provided on the inlet pipeline 13.

[0038] The gas circuit, from the top outlet of the separation tank 1, passes through the vortex flowmeter, through the gas circuit regulating valve 172 and the pressure transmitter II174, controls the output required flow or pressure under the linkage of the PLC control system 6, and is output to the downstream after passing through the ball valve IV131;

[0039] Embodiment 4:

[0040] like Figure 1As shown, based on a control system of a three-phase separator in Example 1, because the medium is flammable and the separator is a pressure vessel, a safety system is set up including a gas leakage alarm 7, an exhaust pipeline 18 connected to the inner cavity of the separation tank 1 is provided on the top of the separation tank 1, and a safety valve 181 and a ball valve V182 are provided on the exhaust pipeline 18, and the PLC control system 6 is connected to the gas leakage alarm 7. If the incoming gas pressure is too high, the pressure can be relieved through the safety valve 181; if a leak occurs on site, the signal is transmitted to the control system through the gas leakage alarm, and an audible and visual alarm is generated, and the alarm signal is transmitted to the main control room.

[0041] During implementation, a sewage discharge pipeline 19 is provided at the bottom of the separation tank 1 , and a sewage discharge valve 191 is provided on the sewage discharge pipeline 19 .

[0042] Embodiment 5:

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, the oil-water interface controller 5 comprises an outer sleeve 51, an inner sleeve 52, an adjusting sleeve 53, a valve stem lifting assembly 54 and an adjusting actuator 55 which are coaxially arranged. The bottom end of the outer sleeve 51 is sealedly connected with the outer wall of the inner sleeve 52 to form a water outlet cavity 511 and a gas balance cavity 531 located above the water outlet cavity 511. The adjusting sleeve 53 is located inside the inner sleeve 52 and is matched with the axial clearance of the inner sleeve 52. An overflow port 533 is provided at the upper end of the adjusting sleeve 53, and the upper end of the adjusting sleeve 53 is connected with the valve stem lifting assembly 54. The regulating cylinder 53 is connected with the valve stem lifting assembly 54 so that the regulating cylinder 53 can rise or fall axially relative to the water outlet chamber 511 of the inner sleeve 52. A passage is formed between the outer sleeve 51, the inner sleeve 52 and the regulating cylinder 53 through the water inlet chamber 521, the overflow port 533 and the water outlet chamber 511. The regulating actuator 55 is transmission-connected to the valve stem lifting assembly 54. The PLC control system 6 is connected to the regulating actuator 55. An oil weir groove 11 is provided in the separation tank 1. The separation tank 1 is separated into an oil-liquid mixing area 2 and an oil area 3 by the oil weir groove 11.

[0044] In this embodiment, the separation tank 1 is provided with an inlet pipeline 13 connected to the oil-liquid mixing area 2, an oil outlet pipeline 14 connected to the oil area 3, and a water outlet pipeline 15 connected to the oil-water interface controller 5 and the water area 4. The oil outlet pipeline 14 is provided with an oil-water online analyzer I141 for detecting the oil-water ratio, and the water outlet pipeline 15 is provided with an oil-water online analyzer II151 for detecting the oil-water ratio; a PLC control system 6 is connected to the oil-water interface controller 5, the oil-water online analyzer I141 and the oil-water online analyzer II151. The PLC control system 6 is combined with the oil-water online analyzer I141 on the oil outlet pipeline 14 and the oil-water online analyzer II151 on the water outlet pipeline 15, and the electric oil-water interface controller 5 on the separation tank 1 to perform automatic oil-water adjustment separation.

[0045] A water weir plate 12 is arranged in the separation tank 1 , and the water weir plate 12 is connected to the outer sleeve 51 in the oil-water interface controller 5 , that is, the water area 4 formed by the water weir plate 12 and the separation tank 1 is connected to the water outlet cavity 511 .

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control system for a three-phase separator, characterized in that: The invention comprises a separation tank (1), and an oil-water interface controller (5) arranged in the separation tank (1); the separation tank (1) is provided with an inlet pipeline (13) connected to an oil-liquid mixing area (2), an oil outlet pipeline (14) connected to an oil area (3), and a water outlet pipeline (15) connected to the oil-water interface controller (5) and a water area (4); the oil outlet pipeline (14) is provided with an oil-water online analyzer I (141) for detecting the oil-water ratio, and the water outlet pipeline (15) is provided with an oil-water online analyzer II (151) for detecting the oil-water ratio; A PLC control system (6), wherein the PLC control system (6) is connected to an oil-water interface controller (5), an oil-water online analyzer I (141), and an oil-water online analyzer II (151).

2. The control system of the three-phase separator according to claim 1, characterized in that: A liquid level transmitter I (31) is provided in the oil area (3), an oil circuit regulating valve (142) is also provided on the oil outlet pipeline (14), and the PLC control system (6) is connected to the liquid level transmitter I (31) and the oil circuit regulating valve (142).

3. The control system of the three-phase separator according to claim 2, characterized in that: A vortex flowmeter (143) is provided between the liquid inlet of the oil outlet pipeline (14) and the oil circuit regulating valve (142), and a ball valve I (144) is provided between the oil circuit regulating valve (142) and the liquid outlet of the oil outlet pipeline (14).

4. The control system of the three-phase separator according to claim 1, characterized in that: A liquid level transmitter II (41) is provided in the water zone (4), a water circuit regulating valve (152) is also provided on the water outlet pipeline (15), and the PLC control system (6) is connected to the liquid level transmitter I (31) and the water circuit regulating valve (152).

5. The control system of the three-phase separator according to claim 4, characterized in that: An electromagnetic flowmeter (153) is provided between the liquid inlet of the water outlet pipeline (15) and the water circuit regulating valve (152), and a ball valve II (154) is provided between the water circuit regulating valve (152) and the liquid outlet of the water outlet pipeline (15).

6. The control system of the three-phase separator according to claim 1, characterized in that: The separation tank (1) is provided with a pressure transmitter I (16), the top of the separation tank (1) is provided with an air outlet pipeline (17), the air outlet pipeline (17) is provided with an air path regulating valve (172), and the PLC control system (6) is connected to the pressure transmitter I (16) and the air path regulating valve (172).

7. The control system of the three-phase separator according to claim 6, characterized in that: A swirl flowmeter (171) is provided between the air inlet of the air outlet pipeline (17) and the air circuit regulating valve (172); a ball valve III (173) is provided between the air circuit regulating valve (172) and the air outlet of the air outlet pipeline (17); a pressure transmitter II (174) is provided between the air circuit regulating valve (172) and the ball valve; the PLC control system (6) is connected to the pressure transmitter I (16), the pressure transmitter II (174) and the air circuit regulating valve (172); and a ball valve IV (131) is provided on the inlet pipeline (13).

8. The control system of the three-phase separator according to claim 1, characterized in that: It also comprises a gas leakage alarm (7); an exhaust pipeline (18) communicating with the inner cavity of the separation tank (1) is provided at the top of the separation tank (1); a safety valve (181) and a ball valve V (182) are provided on the exhaust pipeline (18); and the PLC control system (6) is connected to the gas leakage alarm (7).

9. The control system of the three-phase separator according to claim 1, characterized in that: A sewage discharge pipeline (19) is provided at the bottom of the separation tank (1), and a sewage discharge valve (191) is provided on the sewage discharge pipeline (19).

10. The control system of the three-phase separator according to claim 1, characterized in that: The oil-water interface controller (5) comprises an outer sleeve (51), an inner sleeve (52), an adjusting sleeve (53), a valve stem lifting assembly (54) and an adjusting actuator (55) which are coaxially arranged. The bottom end of the outer sleeve (51) is sealedly connected to the outer wall of the inner sleeve (52) to form a water outlet cavity (511) and an air balance cavity (531) located above the water outlet cavity (511). The adjusting sleeve (53) is located on the inner side of the inner sleeve (52) and is matched with the inner sleeve (52) in an axial clearance. The upper end of the adjusting sleeve (53) is provided with an overflow port (531). 33), and the upper end of the regulating cylinder (53) is connected to the valve stem lifting assembly (54), so that the regulating cylinder (53) can rise or fall axially relative to the water outlet chamber (511) of the inner sleeve (52), and a passage is formed between the outer sleeve (51), the inner sleeve (52) and the regulating cylinder (53) through the water inlet chamber (521), the overflow port (533) and the water outlet chamber (511), the regulating actuator (55) is transmission-connected to the valve stem lifting assembly (54), and the PLC control system (6) is connected to the regulating actuator (55).

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