CN-121993107-A - Method and system for controlling paraffin removal plunger operation of rodless oil extraction well

CN121993107ACN 121993107 ACN121993107 ACN 121993107ACN-121993107-A

Abstract

The invention belongs to the technical field of oil extraction engineering in petroleum industry, and provides a method and a system for controlling paraffin removal plunger operation of a rodless oil extraction well. The method can set the starting time of each cycle in the paraffin removal process, can repeatedly execute working strokes in each cycle, can heat the blade through the heater in each working stroke, and rotate the blade through the rotating mechanism, so that the blade can remove paraffin rapidly, if the paraffin removal of one working stroke is not thorough, the method is executed again until the paraffin removal is completed, the circulating working stroke is set in the cycle in the process, the paraffin removal efficiency is effectively improved, the automation degree is high, and the problems that the catch plunger is required to be thrown manually regularly and the workload is large are solved.

Inventors

ZHANG SIYU
ZHANG YAN
HU SUJUAN
FAN SONG
LIU GUANGSHENG
LV YIMING
DENG ZEKUN
ZHENG GANG
YAO YANG
WEI WEI
LUO CONGYING
SHI HAIXIA

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The method for controlling the paraffin removal plunger operation of the rodless oil extraction well is characterized by comprising the following steps of: setting the working condition of the plunger structure in a single working stroke, wherein the working condition comprises a blade (5) rotatably arranged on the periphery of the plunger (6) and a heater (7) positioned in the blade (5); and operating a cycle period based on the working condition, wherein the cycle period comprises a plurality of working strokes, and the cycle period comprises the following steps in any working stroke: The plunger structure is put into an oil well to remove wax based on working conditions; Judging whether the plunger structure is plugged in an oil well or not based on working conditions, if so, rotating the blade (5) and/or starting the heater (7) until the plunger structure is plugged, and closing the rotating blade (5) and/or closing the heater (7); calculating the average pressure of the plunger (6) in the working stroke after the plunger (6) runs to the wellhead of the oil well; judging whether the average pressure of the current working stroke meets the working condition, if so, ending the current cycle, waiting for the next cycle, and if not, ending the current working stroke and continuing to run the next working stroke.
2. The method for controlling the paraffin removal plunger operation of a rodless oil production well according to claim 1, wherein the working condition of the plunger structure in a single working stroke is set, comprising the steps of: According to historical production data of the oil well, setting the maximum downtime of the plunger (6), the upper limit value of the pressure of the plunger (6) and the set pressure of the plunger (6) for finishing paraffin removal according to the well shaft condition of the oil well.
3. The method for controlling the operation of a paraffin removal plunger for a rodless oil well according to claim 2, wherein the step of injecting the plunger structure into the oil well for paraffin removal based on the working conditions comprises the steps of: Recording the downtime of the plunger (6); When the downtime of the plunger (6) reaches the maximum downtime of the plunger (6), the plunger structure is put into the shaft of the oil well until the plunger structure falls to the bottom of the shaft, and the plunger (6) moves upwards to dewax under the action of liquid flow.
4. A method of controlling wax removal plunger operation for a rodless oil well according to claim 3, wherein determining whether the plunger structure is plugged in the well based on the operating conditions comprises the steps of: Collecting the running pressure of the plunger (6) in the paraffin removal process in real time; When the operating pressure of the plunger (6) is greater than the upper limit value of the pressure of the plunger (6), indicating that the plunger (6) is in operation and blocking, and judging that wax blockage occurs in a shaft of the oil well; When the running pressure of the plunger (6) is less than or equal to the upper limit value of the pressure of the plunger (6), judging that the plunger (6) is not plugged or is plugged.
5. A method of controlling the operation of a wax removal plunger for a rodless oil well according to claim 3, characterized by calculating the average pressure of the plunger (6) during the working stroke, comprising: Wherein, P Flat plate is the average pressure of a working stroke of the plunger (6), P i is the real-time pressure of the plunger (6) in the paraffin removal process, and i is the number of segments of well depth data, i=1, 2.
6. The control method for paraffin removal plunger operation of a rodless oil well according to claim 3, wherein determining whether the average pressure of the current working stroke satisfies the working condition, if so, ending the current cycle, waiting for the next cycle, and if not, ending the current working stroke and continuing to operate the next working stroke comprises the steps of: judging whether the average pressure of the working stroke is smaller than or equal to the upper limit value of the pressure of the plunger (6); if the average pressure of the working stroke is smaller than or equal to the upper limit value of the pressure of the plunger (6), ending the cycle, and operating the next cycle after waiting for the maximum downtime of the plunger (6); if the average pressure of the working stroke is larger than the upper limit value of the pressure of the plunger (6), the working stroke is ended at this time, and the next working stroke is continued to be operated.
7. A control system for paraffin removal plunger operation of a rodless oil well, comprising: a setting unit for setting the working conditions of the plunger structure in a single working stroke, including the working conditions of a blade (5) rotatably mounted on the peripheral side of the plunger (6) and a heater (7) located in the blade (5); the circulation unit is used for running a circulation period based on working conditions, the circulation period comprises a plurality of working strokes, and the circulation unit comprises the following components in any working stroke: The paraffin removal unit is used for throwing the plunger structure into an oil well to remove paraffin based on working conditions; The first judging unit is used for judging whether the plunger structure is plugged in the oil well or not based on working conditions, if so, the rotary blade (5) and/or the heater (7) are/is turned on, and the rotary blade (5) and/or the heater (7) are/is turned off until the plunger structure is plugged; A calculation unit for calculating the average pressure of the plunger (6) in the working stroke after the plunger (6) is operated to the wellhead of the oil well; And the second judging unit is used for judging whether the average pressure of the current working stroke meets the working condition, if so, ending the current cycle, waiting for the next cycle, and if not, ending the current working stroke and continuing to run the next working stroke.
8. The paraffin removal plunger operating control system for a rodless oil production well of claim 7, the paraffin removal unit is characterized by comprising: The recording module is used for recording the time length of the stop of the plunger (6); and the paraffin removal module is used for throwing the plunger structure into a shaft of an oil well until the plunger structure falls to the bottom of the shaft when the downtime of the plunger (6) reaches the maximum downtime of the plunger (6), and the plunger (6) moves upwards under the action of liquid flow to remove paraffin.
9. The paraffin removal plunger operating control system for a rodless oil production well of claim 7, the first judging unit is characterized by comprising: the collecting module is used for collecting the running pressure of the plunger (6) in the paraffin removal process in real time; the first judging module is used for indicating that the plunger (6) runs when being blocked when the running pressure of the plunger (6) is greater than the upper limit value of the pressure of the plunger (6), judging that wax blockage occurs in a shaft of an oil well, and judging that the plunger (6) is not blocked or is blocked when the running pressure of the plunger (6) is less than or equal to the upper limit value of the pressure of the plunger (6).
10. The paraffin removal plunger operating control system for a rodless oil production well of claim 7, the second judging unit is characterized by comprising: The second judging module is used for judging whether the average pressure of the working stroke is smaller than or equal to the upper limit value of the pressure of the plunger (6); And the execution module is used for ending the cycle of the time and operating the next cycle after waiting for the maximum downtime of the plunger (6) if the average pressure of the working stroke is smaller than or equal to the upper limit value of the pressure of the plunger (6), and ending the working stroke of the time and continuing to operate the next working stroke if the average pressure of the working stroke is larger than the upper limit value of the pressure of the plunger (6).

Description

Method and system for controlling paraffin removal plunger operation of rodless oil extraction well Technical Field The invention belongs to the technical field of oil extraction engineering in petroleum industry, and particularly relates to a method and a system for controlling paraffin removal plunger operation of a rodless oil extraction well. Background In the crude oil extraction process, the wax crystals can form deposition in the oil pipe due to the change of factors such as temperature, pressure, flow rate and the like, so that the oil well is waxed. The wax deposition of the oil well can reduce the flow cross section of the lifting fluid, increase the flow resistance of the fluid, influence the normal operation of the oil well equipment and reduce the oil well yield. Along with the continuous expansion of unconventional oil gas development modes, the application scale of the rodless oil extraction lifting process is gradually expanded. The well bore environment of the rodless oil extraction well is complex, the wax deposition phenomenon is more serious, the well bore failure rate is high, and the efficient wax control technology becomes a research key point for guaranteeing the efficient flow of the rodless oil extraction well. The conventional paraffin removal technology mainly aims at the problems of high application cost, poor adaptability and the like of conventional reservoir technologies such as thermal paraffin removal, mechanical paraffin removal and the like, and restricts the application of a well bore treatment technology. The existing paraffin removal technology applicable to rodless oil extraction wells requires manual periodic casting of the capturing plunger, is large in workload, and is uncontrollable in operation mode of the plunger during working, and low in working efficiency, so that an effective paraffin removal technical means is still lacking for unconventional reservoir rodless oil extraction. Disclosure of Invention In order to solve the problems in the background technology, the invention provides a method and a system for controlling the paraffin removal plunger operation of a rodless oil production well. In order to achieve the above purpose, the present invention adopts the following technical scheme: A paraffin removal plunger operation control method for a rodless oil extraction well comprises the following steps: Setting the working conditions of the plunger structure in a single working stroke, including the working conditions of a blade rotatably mounted on the peripheral side of the plunger and a heater positioned in the blade; and operating a cycle period based on the working condition, wherein the cycle period comprises a plurality of working strokes, and the cycle period comprises the following steps in any working stroke: The plunger structure is put into an oil well to remove wax based on working conditions; Judging whether the plunger structure is plugged in the oil well or not based on working conditions, if so, rotating the blade and/or starting the heater until the plunger structure is plugged, and closing the rotating blade and/or closing the heater; calculating the average pressure of the plunger in the working stroke after the plunger runs to the wellhead of the oil well; judging whether the average pressure of the current working stroke meets the working condition, if so, ending the current cycle, waiting for the next cycle, and if not, ending the current working stroke and continuing to run the next working stroke. Further, setting the operating condition of the plunger structure within a single operating stroke, comprising the steps of: and setting the maximum downtime of the plunger, the upper limit value of the plunger pressure and the set pressure for finishing paraffin removal work of the plunger according to historical production data of the oil well and combining the shaft condition of the oil well. Further, the plunger structure is put into an oil well for paraffin removal based on working conditions, and the method comprises the following steps: Recording the downtime of the plunger; When the stop time of the plunger reaches the maximum stop time of the plunger, the plunger structure is thrown into a shaft of an oil well until the plunger falls to the bottom of the shaft, and the plunger moves upwards under the action of liquid flow to remove wax. Further, judging whether the plunger structure is plugged in the oil well based on working conditions, comprising the following steps: collecting the running pressure of the plunger in the paraffin removal process in real time; When the operating pressure of the plunger is greater than the upper limit value of the plunger pressure, indicating that the plunger is in resistance during operation, and judging that wax blockage occurs in a shaft of the oil well; When the running pressure of the plunger is less than or equal to the upper limit value of the plunger pressure, judging that the plunger is no