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CN-121993065-A - Automatic pressure supplementing system for well cementation waiting set

CN121993065ACN 121993065 ACN121993065 ACN 121993065ACN-121993065-A

Abstract

The invention relates to the technical field of wellhead pressure equipment, in particular to an automatic pressure supplementing system for well cementation waiting set. The automatic pressure supplementing system for the well cementation waiting set comprises an oil pressure system and a hydraulic system, wherein pressure oil is filled in the oil pressure system, water is filled in the hydraulic system, output ends of the oil pressure system and the hydraulic system are connected to an oil well wellhead, the hydraulic system comprises a water tank and a water driving pump, an input end of the water driving pump is connected with the water tank, an output end of the water driving pump is connected to a wellhead, the oil pressure system comprises an oil tank, an output oil pump and an energy accumulator, an input end of the output oil pump is connected with the oil tank, and an output end of the output oil pump is communicated with the wellhead. The automatic pressure supplementing system for the well cementation waiting set provided by the invention is matched with the hydraulic system to work, the hydraulic system is used for pressurizing in the pressurizing process, so that the using amount of pressure oil in the hydraulic system is reduced, meanwhile, the automatic pressure supplementing system is switched to the hydraulic system in the pressure stabilizing process, a valve with a remote pressure regulating function on the water side is not required to be installed, and the construction cost in the working process is reduced.

Inventors

  • GAO XIANG
  • SONG YANTAO
  • ZHANG ZHENHUA
  • YUAN LEI
  • YANG YI
  • ZHAO ZHIXUE
  • LI ZHIGANG
  • WANG ZHENLEI
  • BAI XIAOJIE
  • DUAN LIJUN

Assignees

  • 大庆钻探工程有限公司
  • 中国石油天然气集团有限公司

Dates

Publication Date
20260508
Application Date
20250715

Claims (10)

  1. 1. An automatic pressure supplementing system for well cementation waiting set, which is characterized by comprising: The hydraulic system is filled with pressure oil, water is filled in the hydraulic system, output ends of the hydraulic system and the hydraulic system are connected to an oil well wellhead, the hydraulic system comprises a water tank (22) and a water driving pump (26), an input end of the water driving pump (26) is connected with the water tank (22), an output end of the water driving pump is connected to a wellhead, the hydraulic system comprises an oil tank (1), an output oil pump (5) and an energy accumulator (19), an input end of the output oil pump (5) is connected with the oil tank (1), and an output end of the output oil pump is communicated with the wellhead.
  2. 2. The automatic pressure supplementing system for well cementation waiting set according to claim 1 is characterized in that a water pump motor (25) is arranged beside the water driving pump (26), the output end of the water pump motor (25) is connected with the water driving pump (26) to drive the water driving pump (26) to work, a pressure regulating valve (27), a water outlet pressure gauge (28) and a water outlet one-way valve (29) are arranged on a pipeline, connected with a wellhead, of the output end of the water driving pump (26), and a second pressure sensor (17) is arranged around the wellhead.
  3. 3. The automatic pressure supplementing system for well cementation waiting set according to claim 1, wherein a water tank liquid level meter (23) and a liquid level relay (30) are arranged in the water tank (22), the liquid level relay (30) is connected with on-site control equipment, and an electric signal is sent to the control equipment according to the liquid level in the water tank (26).
  4. 4. The automatic pressure supplementing system for well cementation waiting set according to claim 1, wherein a water tank ball valve (21) is arranged below the water tank (26), a water supplementing port is arranged above the water tank, and a water tank air filter (24) is arranged at the water supplementing port.
  5. 5. The automatic pressure supplementing system for well cementation waiting set according to claim 1, wherein the oil pressure system further comprises an oil return pipeline, the input end of the oil return pipeline is connected with the output end of the output oil pump (5), the output end of the oil return pipeline is connected to the oil tank (1), an electromagnetic overflow valve (9) is arranged on the oil return pipeline, and an oil return filter (13) is arranged at the tail end of the oil return pipeline.
  6. 6. The automatic pressure supplementing system for well cementation waiting set according to claim 5, wherein an output end of the output oil pump (5) is provided with an electromagnetic directional valve (14) and an energy accumulator (19), an input end of the electromagnetic directional valve (14) is connected with the output oil pump (5) and an oil return filter (13), and an output end of the electromagnetic directional valve is connected with a wellhead and the energy accumulator (19).
  7. 7. The automatic pressure supplementing system for well cementation waiting set according to claim 6, wherein an energy accumulator seat (18) is arranged below the energy accumulator (19), and an energy accumulator safety valve (20) is arranged at the bottom end of the energy accumulator (19).
  8. 8. The automatic pressure supplementing system for well cementation waiting set according to claim 5 is characterized in that a first one-way valve (8), an oil outlet pressure gauge (10) and a first pressure sensor (12) are arranged on a pipeline between the output end of the output oil pump (5) and the electromagnetic directional valve (14), and a pressure reducing valve (15) and a plurality of electromagnetic stop valves (16) are arranged on a pipeline between the output end of the electromagnetic directional valve (14) and a wellhead.
  9. 9. The automatic pressure supplementing system for the well cementation waiting set, according to claim 1, is characterized in that an oil tank liquid level meter (3) is arranged in the oil tank (1), an oil drain ball valve (2) is arranged at the bottom end of the oil tank (1), the input end of the output oil pump (5) stretches into the oil tank (1) and is provided with an oil suction filter (4) at an inlet, an oil filling port is arranged on the oil tank (1), and an oil tank air filter (11) is arranged at the oil filling port.
  10. 10. The automatic pressure supplementing system for well cementation waiting set according to claim 1, wherein an explosion-proof motor (7) is arranged beside the output oil pump (5), and the output end of the explosion-proof motor (7) is provided with a coupler (6) and is connected with the output oil pump (5) through the coupler (6) to drive the output oil pump (5).

Description

Automatic pressure supplementing system for well cementation waiting set Technical Field The invention relates to the technical field of wellhead pressure equipment, in particular to an automatic pressure supplementing system for well cementation waiting set. Background In the oilfield production process, in order to verify the pressure maintaining performance of an oil well, a pressurizing and pressure maintaining test is generally performed through a wellhead pressure maintaining system, and the pressure maintaining performance of the oil well is judged by maintaining pressure after fluid is injected into a wellhead and observing pressure change of the wellhead. In the prior art, a common oil pressure system or a hydraulic system is used for pressurizing and pressure maintaining work to a wellhead by using a single pressure medium, but when hydraulic oil is pumped into the wellhead by the oil pressure system for pressurizing and pressure maintaining test, the working cost is overlarge because the pressure oil in the wellhead cannot be recovered, and when the hydraulic system is used for pressurizing and pressure maintaining test by injecting water into the wellhead, the construction cost is high because of the problems of high cost of a remote pressure regulating valve applicable to the hydraulic system, long supply period and the like, and the mode of pressurizing and pressure maintaining work to the wellhead by only using water pressure is used. Therefore, in order to overcome the defects, the automatic pressure supplementing system for the well cementation waiting set is provided. Disclosure of Invention First, the technical problem to be solved Aiming at the defects of the prior art, the invention provides an automatic pressure supplementing system for well cementation waiting set, which solves the problem of high construction cost in the wellhead pressurizing and pressure maintaining test process. (II) technical scheme In order to solve the above problems, the present invention provides an automatic pressure compensating system for a well cementation waiting set, comprising: the hydraulic system is filled with pressure oil, water is filled in the hydraulic system, output ends of the hydraulic system and the hydraulic system are connected to an oil well wellhead, the hydraulic system comprises a water tank and a water driving pump, an input end of the water driving pump is connected with the water tank, an output end of the water driving pump is connected to a wellhead, the hydraulic system comprises an oil tank, an output oil pump and an energy accumulator, an input end of the output oil pump is connected with the oil tank, and an output end of the output oil pump is communicated with the wellhead. Preferably, a water pump motor is arranged beside the water driving pump, the output end of the water pump motor is connected with the water driving pump to drive the water driving pump to work, a pressure regulating valve, a water outlet pressure gauge and a water outlet one-way valve are arranged on a pipeline, the output end of the water driving pump is connected with a wellhead, and a second pressure sensor is arranged around the wellhead. Preferably, a water tank liquid level meter and a liquid level relay are arranged in the water tank, the liquid level relay is connected with on-site control equipment, and an electric signal is sent to the control equipment according to the liquid level in the water tank. Preferably, a water tank ball valve is arranged below the water tank, a water supplementing port is arranged above the water tank, and a water tank air filter is arranged at the water supplementing port. Preferably, the oil pressure system further comprises an oil return pipeline, the input end of the oil return pipeline is connected with the output end of the output oil pump, the output end of the oil return pipeline is connected to the oil tank, an electromagnetic overflow valve is arranged on the oil return pipeline, and an oil return filter is arranged at the tail end of the oil return pipeline. Preferably, the output end of the output oil pump is provided with an electromagnetic reversing valve and an energy accumulator, the input end of the electromagnetic reversing valve is connected with the output oil pump and an oil return filter, and the output end of the electromagnetic reversing valve is connected with a wellhead and the energy accumulator. Preferably, an accumulator seat is arranged below the accumulator, and an accumulator safety valve is arranged at the bottom end of the accumulator. Preferably, a first one-way valve, an oil outlet pressure gauge and a first pressure sensor are arranged on a pipeline between the output end of the output oil pump and the electromagnetic directional valve, and a pressure reducing valve and a plurality of electromagnetic stop valves are arranged on a pipeline between the output end of the electromagnetic directional valve and the wellhead. Preferably,