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CN-121993116-A - Oil gas self-injection production device, installation method thereof and oil gas self-injection production system

CN121993116ACN 121993116 ACN121993116 ACN 121993116ACN-121993116-A

Abstract

The embodiment of the application provides an oil gas self-injection production device, an installation method thereof and an oil gas self-injection production system, and relates to the technical field of oil gas self-injection production. The oil gas self-injection production device comprises an oil pipe, an anticorrosive coating, a plurality of first metal layers, a cathode protection assembly and a dosing assembly. The anticorrosive coating is arranged on the inner wall of the oil pipe. The first metal layers are arranged on the outer wall of the oil pipe at intervals along the extending direction of the oil pipe, and the metal activity of the first metal layers is higher than that of the oil pipe. The cathode protection component is fixedly connected with one end of the oil pipe and comprises a second metal layer, and the metal activity of the second metal layer is greater than that of the oil pipe. The dosing assembly is fixedly connected with the cathode protection assembly, is positioned on one side, away from the oil pipe, of the cathode protection assembly, and is used for releasing corrosion inhibitors and/or scale inhibitors. According to the oil gas self-injection production device, the second metal layer can protect the outer wall of the oil pipe through an electrochemical protection principle, and the oil pipe is not easy to damage.

Inventors

  • LIU YINHUA
  • ZHANG BAOYUN
  • LIU KAI
  • CHEN ZHIMING
  • WANG YUNFEI

Assignees

  • 中国石油大学(北京)
  • 中石油煤层气有限责任公司工程技术研究院

Dates

Publication Date
20260508
Application Date
20251230

Claims (10)

  1. 1. An oil and gas self-injection production device, which is characterized by comprising: An oil pipe (100); The anti-corrosion layer (200) is arranged on the inner wall of the oil pipe (100); a plurality of first metal layers (300), wherein the first metal layers (300) are arranged on the outer wall of the oil pipe (100) at intervals along the extending direction of the oil pipe (100), and the metal activity of the first metal layers (300) is higher than that of the oil pipe (100); the cathode protection assembly (400) is fixedly connected with one end of the oil pipe (100), the cathode protection assembly (400) comprises a second metal layer (410), and the metal activity of the second metal layer (410) is larger than that of the oil pipe (100); The dosing assembly (500), dosing assembly (500) with cathodic protection subassembly (400) fixed connection, dosing assembly (500) are located cathodic protection subassembly (400) deviate from oil pipe (100) one side, dosing assembly (500) are used for releasing corrosion inhibitor and/or scale inhibitor.
  2. 2. The oil and gas self-injection production device according to claim 1, wherein the oil pipe (100) comprises a plurality of first pipe sections (110) and a plurality of second pipe sections (120) which are alternately arranged, and the first metal layer (300) is arranged on the outer wall of the first pipe sections (110); The outer wall of the first pipe section (110) is provided with a mounting groove (140), and at least part of the first metal layer (300) is positioned in the mounting groove (140).
  3. 3. The oil and gas self-injection production device according to claim 1, wherein the first metal layer (300) is a magnesium layer, a magnesium alloy layer, a zinc alloy layer, an aluminum layer or an aluminum alloy layer; the interval between two adjacent first metal layers (300) is 5m to 11m.
  4. 4. A device for the production of oil and gas self-injection according to any one of claims 1 to 3, characterized in that said cathodic protection assembly (400) further comprises: The second metal layer (410) is fixedly connected to the circumferential surface of the supporting framework (420); The first connector (430) is connected with one end of the supporting framework (420), and the first connector (430) is fixedly connected with one end of the oil pipe (100); and the second connector (440) is connected with the other end of the supporting framework (420), and the second connector (440) is fixedly connected with the dosing assembly (500).
  5. 5. A device according to any one of claims 1-3, characterized in that the dosing assembly (500) comprises: a third joint (510), the third joint (510) being fixedly connected to the cathodic protection assembly (400); The chemical adding pipe (520), the chemical adding pipe (520) is fixedly connected with the third joint (510), a containing cavity (521) is formed in the chemical adding pipe (520), the containing cavity (521) is used for containing the corrosion inhibitor and/or the scale inhibitor, a plurality of chemical outlet holes (522) communicated with the containing cavity (521) are formed in the chemical adding pipe (520), and the chemical outlet holes (522) are used for releasing the corrosion inhibitor and/or the scale inhibitor to the outside of the chemical adding assembly (500).
  6. 6. A device according to any one of claims 1-3, further comprising a filter assembly (600), said filter assembly (600) comprising: A sand control screen (610), wherein the sand control screen (610) is communicated with the other end of the oil pipe (100), a sand control pipe cavity (611) is formed in the sand control screen (610), and a plurality of liquid inlet holes (612) communicated with the sand control pipe cavity (611) are formed in the sand control screen (610); a sand screen (620), the sand screen (620) being fixedly connected to the outer peripheral surface of the sand screen (610); The sand setting pipe (630), the sand setting pipe (630) is fixedly connected with one end of the sand control screen (610) deviating from the oil pipe (100), and a sand setting pipe cavity (631) communicated with the sand control pipe cavity (611) is arranged in the sand setting pipe (630); And the plug (640) is used for plugging one end of the sand setting pipe cavity (631) away from the sand control pipe cavity (611).
  7. 7. A gas and oil self-injection production device according to any one of claims 1-3, further comprising a tubing plug assembly (700), the tubing plug assembly (700) comprising: an inner plug pipe (710), the inner plug pipe (710) being disposed between the oil pipe (100) and the cathodic protection assembly (400), and the inner plug pipe (710) being in communication with the oil pipe (100); the fixing piece (720), the fixing piece (720) is fixedly connected to the inner pipe wall of the inner plugging pipe (710), and the fixing piece (720) is provided with a clamping groove (721); the plugging piece (730), the plugging piece (730) is inserted into the clamping groove (721), the plugging piece (730) is used for plugging the inner plugging tube (710), and the plugging piece (730) can be separated from the fixing piece (720) under the action of external force.
  8. 8. A device for producing oil and gas self-injection according to any one of claims 1-3, further comprising a temperature and pressure measuring assembly (800), said temperature and pressure measuring assembly (800) comprising: The drag cylinder (810), one end of the drag cylinder (810) which is away from the cathode protection assembly (400) of the dosing assembly (500) is fixedly connected, and a drag cylinder cavity (811) is formed in the drag cylinder (810); a buffer (820), the buffer (820) being disposed within the drag cylinder cavity (811); The pressure gauge (830) and the thermometer are arranged in the dragging cylinder cavity (811), and the pressure gauge (830) and the thermometer are connected with the inner wall of the dragging cylinder (810) through the buffer piece (820).
  9. 9. A method of installing an oil and gas self-injection production apparatus as claimed in any one of claims 1 to 8, comprising: Placing a dosing assembly (500) into a sleeve (10) of an oil-gas self-injection production system; Fixedly connecting a cathodic protection assembly (400) with the dosing assembly (500), and placing the cathodic protection assembly (400) into the sleeve (10); Fixedly connecting an oil pipe (100) with the cathode protection assembly (400), and placing the oil pipe (100) into the sleeve (10).
  10. 10. A self-injection production system for oil and gas, characterized by comprising a casing (10) and an oil and gas self-injection production device (20) according to any one of claims 1-8 arranged in said casing (10).

Description

Oil gas self-injection production device, installation method thereof and oil gas self-injection production system Technical Field The application relates to the technical field of oil gas production, in particular to an oil gas self-injection production device, an installation method thereof and an oil gas self-injection production system. Background In the oil gas self-injection production system, an oil pipe is usually arranged inside a casing, and the oil pipe is mainly used for producing oil gas in a stratum to the ground in a self-injection manner. In the related art, the inner wall of the oil pipe is generally coated with an anti-corrosion layer to achieve anti-corrosion of the inner wall of the oil pipe. However, the oil and gas in the annulus between the casing and the tubing can erode the outer wall of the tubing, resulting in damage to the tubing. Disclosure of Invention The embodiment of the application provides an oil gas self-injection production device, an installation method thereof and an oil gas self-injection production system, wherein a second metal layer can protect the outer wall of an oil pipe through an electrochemical protection principle, and the oil pipe is not easy to damage. In a first aspect, an embodiment of the present application provides an oil gas self-injection production device, including an oil pipe, an anti-corrosion layer, a plurality of first metal layers, a cathodic protection assembly, and a dosing assembly. Wherein, the anticorrosive coating sets up on the inner wall of oil pipe. The first metal layers are arranged on the outer wall of the oil pipe at intervals along the extending direction of the oil pipe, and the metal activity of the first metal layers is higher than that of the oil pipe. The cathode protection component is fixedly connected with one end of the oil pipe and comprises a second metal layer, and the metal activity of the second metal layer is greater than that of the oil pipe. The dosing assembly is fixedly connected with the cathode protection assembly, is positioned on one side, away from the oil pipe, of the cathode protection assembly, and is used for releasing corrosion inhibitors and/or scale inhibitors. In some possible implementations, the oil pipe includes a plurality of first pipe sections and a plurality of second pipe sections alternately arranged, the first metal layer being disposed on an outer wall of the first pipe sections. In some possible implementations, the first pipe section has a mounting groove on an outer wall thereof, and at least a portion of the first metal layer is located within the mounting groove. In some possible implementations, the first metal layer is a magnesium layer, a magnesium alloy layer, a zinc alloy layer, an aluminum layer, or an aluminum alloy layer. The interval between two adjacent first metal layers is 5m to 11m. In some possible implementations, the cathodic protection assembly further includes a support backbone, a first joint, and a second joint. Wherein, the second metal layer is fixedly connected on the circumference surface of the supporting framework. The first joint is connected with one end of the supporting framework, and the first joint is fixedly connected with one end of the oil pipe. The second joint is connected with the other end of the supporting framework, and the second joint is fixedly connected with the dosing assembly. In some possible implementations, the dosing assembly includes a third connector and a dosing tube. Wherein, the third joint is fixedly connected with the cathode protection component. The dosing pipe is fixedly connected with the third joint, and a containing cavity is arranged in the dosing pipe and used for containing corrosion inhibitors and/or scale inhibitors. The dosing tube is provided with a plurality of drug outlet holes communicated with the accommodating cavity, and the drug outlet holes are used for releasing the corrosion inhibitor and/or the scale inhibitor to the outside of the dosing assembly. In some possible implementations, the oil and gas self-injection production device further includes a filter assembly including a sand control screen, a sand setting pipe, and a plug. The sand control screen tube is communicated with the other end of the oil pipe, a sand control pipe cavity is arranged in the sand control screen tube, and a plurality of liquid inlets communicated with the sand control pipe cavity are arranged on the sand control screen tube. The sand screen is fixedly connected to the outer peripheral surface of the sand screen. The sand setting pipe is fixedly connected with one end of the sand control screen pipe, which is far away from the oil pipe, and a sand setting pipe cavity communicated with the sand control pipe cavity is arranged in the sand setting pipe. The end cap seals one end of the sand setting pipe cavity away from the sand control pipe cavity. In some possible implementations, the oil and gas self-injection production dev