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Centralizing string and restoring string for horizontal well casing pipe dislocation and restoring process of centralizing string and restoring string

A horizontal well and casing technology, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc., can solve the problem that the wrong well cannot be corrected and repaired, and achieve the effect of avoiding pollution

Active Publication Date: 2015-03-11
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to provide horizontal well casing misalignment, straightening pipe string and repairing pipe string and its repairing process, and to solve the overlap degree of inner diameter of casing misalignment in the oilfield The problem that 30-50% faulty wells cannot be corrected and repaired

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  • Centralizing string and restoring string for horizontal well casing pipe dislocation and restoring process of centralizing string and restoring string
  • Centralizing string and restoring string for horizontal well casing pipe dislocation and restoring process of centralizing string and restoring string
  • Centralizing string and restoring string for horizontal well casing pipe dislocation and restoring process of centralizing string and restoring string

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Embodiment Construction

[0028] The present invention is described in detail below in conjunction with accompanying drawing.

[0029] The horizontal well casing misalignment setting string includes booster a2, hydraulic anchor a1 and tubing, and the eccentric setting hanger a3, booster a2 and hydraulic anchor a1 are connected sequentially through the tubing from bottom to top. The booster a2 provides the power for the pipe string to correct the wrong casing, avoiding the risk of using the gravity of the pipe string to drop suddenly. When the weight of the conventional down-pressing pipe string cannot meet the straightening force required for the lower casing to be broken, the hydraulic pressure is used to drive the booster a2 and the hydraulic anchor a1 to make the straightening. First, the hydraulic anchor a1 works to fix the bottom of the pipe string , and then the booster a2 works for the front end eccentric straightening hanger a3 to provide a straightening force to straighten the lower part of th...

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Abstract

The invention discloses a centralizing string and a restoring string for horizontal well casing pipe dislocation and a restoring process of the centralizing string and the restoring string so as to solve the problem that existing dislocation wells with the casing pipe dislocation and inner diameter coincidence degree ranging from 30-50% in an oil field are incapable of being centralized and restored. The centralizing string comprises a booster, a hydraulic anchor and an oil pipe, and an eccentricity centralizing hanger, the booster and the hydraulic anchor are sequentially connected through the oil pipe. The restoring string matched with the centralizing string in use comprises an oil pipe and a casing pipe restoring tool which are connected, an insertion pipe is connected at the bottom of a cylinder of the casing pipe restoring tool, and a casing pipe is inserted into an outer positioning cylinder of the eccentricity centralizing hanger. The restoring process is particularly applicable to thermal recovery horizontal well casing pipe dislocation restoring works and similarly applicable to other casing pipe dislocation horizontal wells. The centralizing string and the restoring string and the restoring process can be used for effectively restoring the dislocation casing pipe at a horizontal segment of the horizontal well, have no chemical pollution to an oil layer and are wide in application range, simple in construction steps and capable of effectively reducing production cost.

Description

Technical field [0001] The present invention involves an oilfield horizontal well-hubbelling tool and technique, especially the horizontal well-seductive tube fastening pipe column and repair column and its repair process, solving the current section of the inner diameter of the pipe of the oil field is 30-50, 30-50The problem that the faulty well between %cannot be righteous and repair. Background technique [0002] Due to the large -scale promotion of horizontal well technology in the oil field, the problem of horizontal well -supporting governance of horizontal wells also appears to be increasingly prominent. Among them, the method and tool support of the horizontal wells are incomplete.There are many difficulties in the problem of errors in horizontal wells, but it is mainly divided into four aspects. One is to play channels and repair pillars and then lower technical; second, complete the problem of completely repairing the wrong section to make it a longer life life;Third, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B29/10
Inventor 朱瑛辉张全胜张峰田玉刚伊伟锴杨慧温盛魁安申法
Owner CHINA PETROLEUM & CHEM CORP
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