Method for replacing producing well shaft casing pipe

A technology for producing oil wells and casings, which is applied to casings, drill pipes, drilling equipment, etc., can solve the problems of limited reverse opening depth, small size, and many construction steps, so as to improve sealing, improve reliability, and prevent blowout effect

Pending Publication Date: 2019-05-24
SINOPEC SSC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many construction steps and complex procedures for undercutting and casing replacement operations, which require the use of undercut drilling tools, which are not suitable for deep well casing replacement operations
This is because during casing undercutting operations, the undercut drilling tool is usually inserted into the casing for undercutting. Due to the small

Method used

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  • Method for replacing producing well shaft casing pipe
  • Method for replacing producing well shaft casing pipe
  • Method for replacing producing well shaft casing pipe

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Embodiment Construction

[0028] The operating tools used in the present invention include a downhole fishing tool 1 , a sleeve milling shoe 2 and an external butt joint cementing tool 3 .

[0029] Such as Figure 1 to Figure 4 As shown, the downhole fishing tool 1 includes a conical overshot 1b, the upper port of the conical overshot 1b is screwed with a slip joint 1a, the lower end of the overshot is screwed with a standard guide shoe 1f, and the conical overshot 1b Slips are installed in the inner cavity, A-type packing 1c is installed on the upper end of the slips, and a control ring 1e is installed on the lower end of the slips. The inclination angle of the busbar of the outer wall of the conical overshot 1b relative to the axis of the conical overshot is 2°. And the inner diameter of the upper port of the conical overshot is 12mm smaller than the inner diameter of the lower port; the inner wall of the conical overshot 1b is provided with a conical spiral slip groove 1b2, and the upper end of the ...

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Abstract

The invention relates to a method for replacing a producing well shaft casing pipe. The method sequentially includes the steps of firstly, using a packer to block the inner cavity of a residual casingpipe; secondly, using a hydraulic inner cutter to cut off the abraded casing pipe on the upper portion of the residual casing pipe; thirdly, pulling out the cut casing pipe; fourthly, mounting a casing pipe mill shoe at the bottom of a drilling tool to mill a fish top outer chamfer at the fish top of the residual casing pipe; fifthly, mounting a float collar and a new casing pipe at the upper endof a cementing tool; sixthly, lowering the drilling tool to allow the fish top to smoothly enter an externally-inserted guide shoe, continuously lowering the drilling tool to allow the fish top to reach a lengthening cylinder, and starting a pump to circulate workover fluid; seventhly, injecting cement slurry after the circulation is normal to allow the cement slurry to enter the annulus throughcement injection holes; eighthly, putting in a rubber plug, and pushing the rubber plug to the top of the float collar to achieve setting; ninthly, lowering the drilling tool again until the fish topouter chamfer and a butt joint connector inner chamber are connected in an embedded manner, and pressing down 500kN to achieve casing pipe butt joint and sealing. The method is simple, practicable, convenient to operate, low in production cost and downhole risks, simple in butt joint and setting operation and high in sealing reliability.

Description

technical field [0001] The invention relates to a method for changing the casing of an oil production wellbore. In the construction of replacing the damaged casing of the wellbore, it is used for the butt cementing of the newly replaced casing string in the wellbore and the original remaining casing in the wellbore, which belongs to the overhaul of the wellbore. technology field. Background technique [0002] Oil and natural gas are exploited through the wellbore formed by drilling. The wellbore casing string in the wellbore is formed by screwing the casing one by one through the thread. With the increase of oil and gas well production time, the downhole environment is getting worse and it is easy Breakage of casing. Usually, the cemented casing outside the casing is not easy to be damaged. The bare pipe section above the cemented section is more likely to be damaged due to double-sided corrosion, and sometimes it can be broken into several pieces. In this case, it is neces...

Claims

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Application Information

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IPC IPC(8): E21B29/00E21B31/18E21B19/10E21B33/13
Inventor 袁茂龙许尔丹陈阳时益情田茹
Owner SINOPEC SSC
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