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Horizontal well leakage prevention double-layer tubing isolation circulation mechanism

A technology of double-layer oil pipe and circulation mechanism, which is applied in the direction of drilling pipe, casing, drilling equipment, etc., can solve the problems of reducing the working efficiency of sand flushing fluid, reducing the oil production capacity of the formation, formation pollution, etc., and achieves obvious leakage prevention function, Eliminate formation leakage, high efficiency and utilization

Active Publication Date: 2016-08-31
XIAN ZHONGFU KAIHONG GASOLINEEUM TECH +3
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  • Application Information

AI Technical Summary

Problems solved by technology

The leakage of the sand washing fluid not only directly reduces the working efficiency of the sand washing fluid, but also causes various pollution to the formation, which reduces the oil production capacity of the formation and is difficult to restore

Method used

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  • Horizontal well leakage prevention double-layer tubing isolation circulation mechanism
  • Horizontal well leakage prevention double-layer tubing isolation circulation mechanism
  • Horizontal well leakage prevention double-layer tubing isolation circulation mechanism

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Experimental program
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Embodiment Construction

[0016] The present invention will be described in detail below in combination with specific embodiments.

[0017] see figure 1 , the horizontal well leakage prevention double-layer oil pipe isolation circulation mechanism, including two identical double-layer oil pipe isolation steering joints connected through the double-layer oil pipe string structure, which are respectively the upper double-layer oil pipe isolation steering joint 2 and the lower double-layer oil pipe isolation steering joint Connector 3;

[0018] see figure 2 , the double-layer oil pipe isolation steering joint includes outer pipe 4, inner pipe 5 and oil pipe collars of different pipe diameters coaxially sleeved, and a double-layer oil pipe annulus 6 is formed between the outer pipe 4 and the inner pipe 5, and the double-layer oil pipe isolation The two ends of the outer wall of the outer pipe of the steering joint are respectively provided with oil pipe collars; the double-layer oil pipe annulus 6 inclu...

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Abstract

The invention relates to a horizontal well leakage prevention double oil pipe isolation circulation mechanism. In the sand flushing operation of horizontal wells, when the length of the non-flowing isolation space is greater than the length of the perforated well section, as the pipe string continues to penetrate into the bottom of the well, the more perforated sections are isolated, the more effective the leakage prevention function will be. The more obvious, the higher the efficiency and utilization of the working cycle fluid. The technical solution adopted in the present invention includes two identical double-layer oil pipe isolation steering joints connected through the double-layer oil pipe string structure, which are respectively an upper double-layer oil pipe isolation steering joint and a lower double-layer oil pipe isolation steering joint.

Description

technical field [0001] The invention relates to a horizontal well sand flushing device, in particular to a horizontal well leakage prevention double oil pipe isolation circulation mechanism. Background technique [0002] When conventionally using double-layer tubing for sand flushing in horizontal wells, all or part of the double-layer tubing or concentric tubing is generally used for operation, and the packer matched with it is only used at the lowest end to cooperate with the construction of the sand-washing bit, and does not have the ability to prevent Or the function of reducing formation loss. In this type of construction, since the perforation section of the horizontal well has hundreds of meters or even thousands of meters, each perforation section participates in the liquid circulation of the sand washing operation, so the formation leakage is very considerable. The leakage of the sand washing fluid not only directly reduces the working efficiency of the sand was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/00E21B17/02
Inventor 景忠峰李泰余杨君韦明姚春林李玉萍魏江伟周丹刘艺李伟锋刘亭李宜林张世勤高贵斌贾品元郭亮同松朱云翔
Owner XIAN ZHONGFU KAIHONG GASOLINEEUM TECH
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