Gas-preventing oil well lifting system

A technology of gas prevention and oil well, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc. It can solve the problem of limited volume of gas prevention oil well pump, poor gas prevention effect of oil well lifting system, and is not conducive to improving oil well pump Pump efficiency and other issues, to prevent casing spray and casing wax deposition, reduce pump leakage, and reduce density

Inactive Publication Date: 2019-10-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the limited volume of the middle chamber of the gas-proof oil well pump, the gas-proof effect of the oil well lifting system is not good, which is not conducive to improving the pump efficiency of the oil well pump

Method used

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Embodiment Construction

[0053] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0054] It should be noted that the oil casing annulus involved in the embodiment of the present invention refers to the annular space between the oil pipe and the casing.

[0055] The embodiment of the present invention provides an oil well lifting system for gas prevention, as shown in the attached figure 1 As shown, the system includes: a casing 1, an oil pipe 2, and the oil pipe 2 is sleeved in the casing 1; further, the system also includes: a heavy ball pump 3, an anti-gas device 4, and a tail Pipe 5; oil pipe 2 is provided with gas lift valve 6, and the lower port of oil pipe 2 communicates with the discharge port of heavy ball pump 3; gas-proof device 4 is used to separate crude oil and gas in the oil jacket annulus, and the gas...

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Abstract

The invention discloses a gas-preventing oil well lifting system and belongs to the field of oil recovery. The gas-preventing oil well lifting system comprises a casing and an oil pipe. The oil pipe is arranged in the casing in a sleeving manner. The system also comprises a heavy ball pump, a gas-preventing device and a tail pipe separately located in the casing; the lower port of the oil pipe communicates to a liquid outlet of the heavy ball pump and a gas lifting valve is arranged at the lower port; the gas-preventing device is used for separating crude oil and gas in an annulus of an oil jacket, and is provided with an inlet, an exhaust port and an oil drain outlet communicating to the liquid inlet of the heavy ball pump; the upper port of the tail pipe is connected to the gas-preventing device and the lower port is closed. The gas-preventing oil well lifting system can separate the crude oil and the gas in the annulus of the oil jacket effectively through the gas-preventing device,not only can prevent the gas from entering into the heavy ball pump, improve the pressure at the pump inlet so as to improve the pump filling coefficient and the pump efficiency, but also can feed the separated gas into the oil pump to be mixed with the crude oil in the oil pipe, so that lifting-assisting and load-reducing action is exerted.

Description

technical field [0001] The invention relates to the field of oil production, in particular to an oil well lifting system for gas prevention. Background technique [0002] In the process of oilfield exploitation, if the energy of the oil layer is reduced, it is necessary to use the lifting system to lift the crude oil from the bottom of the well to the ground. Among them, the oil pump is the core equipment of the lifting system, which is used to pump the crude oil in the wellbore to the ground. And when the gas in the oil jacket annulus enters into the oil well pump along with the crude oil, the pump efficiency of the oil well pump will be reduced, which is unfavorable for the exploitation of crude oil. Therefore, it is necessary to provide an oil well lifting system for gas prevention, so as to prevent the gas in the oil casing annulus from entering the oil well pump. [0003] The prior art provides an oil well lifting system for gas prevention, the system includes: a casi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/38E21B43/12E21B43/00
CPCE21B43/121E21B43/123E21B43/38
Inventor 张海浪胡斌余满林李秀存张祎
Owner PETROCHINA CO LTD
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