Shaft bottom leakage-proof plugging system and method for cementing well with same

A leak-proof and casing technology, which is applied in wellbore/well valve devices, wellbore/well parts, earthwork drilling and production, etc., can solve problems such as insufficient cement inflow, cementing failure, and well layer leakage

Active Publication Date: 2014-01-15
XINJIANG GRAND OILFIELD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to leakage in the formation at the bottom of the well or improper operation when running the casing into the well, the pressure is excited and the well formation is lost.
Cause cement to flow out fr

Method used

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  • Shaft bottom leakage-proof plugging system and method for cementing well with same

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Embodiment Construction

[0016] Such as figure 1 As shown, the bottom hole leakage prevention plugging system of the present invention includes a casing 30, the lower end of the casing 30 is connected to an upper joint 1 made of a copper material, and the lower end of the upper joint 1 is connected to a lower joint 2 made of a copper material, The lower end of the lower joint 2 is connected with a casing shoe 31 . The center of the upper joint 1 is processed with a first through hole 3 . The upper end of the inner cavity wall of the first through hole 3 is processed with a sleeve special buckle 23 connected with the sleeve 30 . The lower end of the sleeve pipe 30 is installed in the special buckle 23 for the sleeve pipe. The center of the lower joint 2 is processed with a second through hole 4 . The second through hole 4 is a stepped hole formed by the first cylindrical hole 5 and the second cylindrical hole 6 . A first stepped surface is formed between the first cylindrical hole 5 and the second ...

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Abstract

The invention discloses a shaft bottom leakage-proof plugging system and a method for cementing a well with the system, and belongs to petroleum drilling and well cementation construction operations. The system is composed of an upper connector, a lower connector, a casing pipe and a casing shoe, the upper connector is connected with the lower connector, and the casing pipe and the casting shoe are arranged on the upper connector and the lower connector respectively. In the well cementation process, when the system is arranged down to the well, after the casing pipe is down to a preset depth, a ball is put in, the ball reaches the second step face of a valve seat barrel, pressurization is carried out in the valve seat barrel, a rubber sleeve expands due to pressure and extrudes a well wall, fixed sealing and isolation is achieved, then pressurization is carried out further, a shear pin is shorn, the pressure pushes the valve seat barrel to move to the first step face, a bypass hole of the upper connector is exposed out, cement paste is poured in through the upper end of the casing pipe, flows out of the bypass hole, and is filled into the space between the well wall and the casing pipe, the normal well cementation operation is carried out, the poured-incement paste in the well cementation process can be prevented from being leaked through a well bottom leakage layer, the smooth well cementation operation is guaranteed, well cementation quality is guaranteed, and the system is simple in structure and convenient to mount.

Description

technical field [0001] The invention relates to an oil drilling cementing construction operation, in particular to a well bottom leakage prevention and plugging system and a cementing method using the system. Background technique [0002] In cementing operations in petroleum, geological drilling and other fields, after drilling to the designed well depth, it is necessary to run the casing into the well, and inject cement from the inner cavity of the casing, so that the cement flows into the bottom of the well, and then flows out of the casing into the casing and Between the well walls, the continuously entering cement gradually rises until the entire space between the casing and the well wall is filled from bottom to top, so that the casing and the well wall are fixed together to strengthen the well wall. However, due to leakage in the formation at the bottom of the well or improper operation when running the casing into the well, the pressure is excited and the well formati...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B33/127E21B34/06
Inventor 贺志刚
Owner XINJIANG GRAND OILFIELD TECH
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