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Multifunctional oil production pipe column for low-pressure oil well

A multi-functional oil production pipe technology, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve the problems of working fluid leakage, affecting crude oil production, and no anti-backflow, etc., to achieve the effect of avoiding leakage

Inactive Publication Date: 2021-02-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the multi-functional oil production string for low-pressure oil wells provided by the present invention is to overcome the prior art when the oil rod tube is sealed and cleaned in the wellbore. The problem of establishing an oil-casing communication channel; the second purpose is to overcome the problem that the oil production string in the prior art has no anti-backflow function, and for the low-permeability oil reservoir with serious formation deficit, the serious leakage of working fluid will cause oil layer pollution and affect the crude oil production

Method used

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  • Multifunctional oil production pipe column for low-pressure oil well
  • Multifunctional oil production pipe column for low-pressure oil well
  • Multifunctional oil production pipe column for low-pressure oil well

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, a multifunctional oil production string for a low-pressure oil well includes a sucker rod 1, a tubing 2, a pump 3, a drainer 4, a packer 5 and a plug 7, a sucker rod 1, a pump 3, The drainer 4 , the packer 5 and the plug 7 are sequentially connected from top to bottom and the sucker rod 1 is located inside the tubing 2 , and the packer 5 is sleeved outside the drainer 4 .

[0025] During the normal oil production process, the drainer 4 is not opened, the packer 5 is in the unsealed state, the sucker rod 1 is used for the normal production of the oil well through the oil well pump 3, and the oil well test operation is not affected, and the oil production string realizes normal oil production and Oil well testing function; when the oil well needs workover (pump inspection) operation, when it is necessary to clean the sucker rod 1 and the tubing 2, inject cleaning fluid into the tubing 2, the drainer 4 is opened, and the packer 5 sets the tubing ...

Embodiment 2

[0027] Further, a screen tube 6 is also included, and the screen tube 6 is connected between the drainer 4 and the plug 7 . The screen tube 6 can not only prevent sand but also ensure the permeability during the oil production process, protect the oil production string well, reduce the impurity content of the produced oil, and has low manufacturing cost and simple operation.

[0028] Further, the oil release device 4 is a hydraulic pressure release device. The hydraulic pressure relief device can open the oil drain hole before pulling out the sucker rod, establish the oil jacket communication channel, and realize the positive injection of the oil pipe, and do not need to wait until the sucker rod is pulled out to establish the oil jacket communication channel.

[0029] Further, such as figure 2 As shown, the oil leaker 4 includes a main body 42, the main body 42 is provided with a through hole 46 in the axial direction, the upper end of the through hole 46 is provided with a...

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Abstract

The invention belongs to the technical field of oil production in oil fields, and particularly provides a multifunctional oil production pipe column for a low-pressure oil well. The multifunctional oil production pipe column comprises a sucker rod, an oil pipe, an oil well pump, an oil drain device, a packer and a screwed plug, wherein the sucker rod, the oil well pump, the oil drain device, the packer and the screwed plug are sequentially connected from top to bottom, the sucker rod is positioned inside the oil pipe, and the packer is connected to the outer side of the oil drain device in a sleeving manner. The problems that when an oil rod pipe is cleaned in a shaft in a closed mode, a mechanical impact type oil drain device is adopted in the oil production pipe column, an oil sleeve communicating channel can be established only after the sucker rod is pulled out, the backward flowing preventing function is not achieved, oil reservoir pollution is caused and the crude oil yield is affected due to severe stratum depletion and low-permeability oil reservoirs and severe working fluid leakage are solved. An oil jacket communication channel and a positive circulation cleaning channelare established by adopting the hydraulic oil drain device and the temperature control packer, so that the function of preventing working fluid from flowing backwards is added.

Description

technical field [0001] The invention belongs to the technical field of oil production in oilfields, and in particular relates to a multifunctional oil recovery pipe string for low-pressure oil wells. Background technique [0002] During the oil well workover (pump inspection) operation, dirty oil and sewage will be generated during the lifting and cleaning of the oil rod and pipe (for the convenience of description, the combination of the sucker rod and the oil pipe is referred to as the oil rod and pipe). Disposal will cause pollution to the environment around the well site. [0003] In recent years, some oilfields in China have carried out the research and test of oil well cleaning and workover operation technology, that is, during the workover operation, the circulation cleaning channel is established through the supporting wellhead cleaning device or downhole cleaning device, and the high temperature and high pressure is injected into the wellbore by the environmental pr...

Claims

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Application Information

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IPC IPC(8): E21B21/10E21B33/126E21B33/12
CPCE21B21/10E21B33/126E21B33/12
Inventor 江智强巨亚锋王尚卫罗有刚王嘉鑫刘江波张雄涛樊勇杰张安康
Owner PETROCHINA CO LTD