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Plasma cutting device and method for underground oil casing

A cutting device and plasma technology, applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of large cutting force, complex ground equipment, tool wear, etc., and achieve the effect of high cutting success rate, simple equipment and precise cutting

Pending Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical cutting is the most traditional cutting method, which has problems such as severe tool wear, high cutting force, and low cutting efficiency; sandblasting cutting has disadvantages such as high cost, complicated ground equipment, and huge sand mixing system

Method used

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  • Plasma cutting device and method for underground oil casing
  • Plasma cutting device and method for underground oil casing
  • Plasma cutting device and method for underground oil casing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]Preferred embodiment 1, the downhole cutting string mainly includes cables, electrode feeding mechanism, guide shoe and so on. In the plasma cutting process, after the cable carrying the tool string enters the specified position inside the stuck oil / casing, first apply positive and negative voltages between the downhole oil / casing and the tool electrodes, and the electrodes in the electrode feeding mechanism are under the control of the servo system Continuously moving to the inner wall of the pipe string, when the electrode and the inner wall of the pipe string reach a certain gap, a violent plasma discharge will occur. Under the high temperature and high pressure of the plasma discharge, the pipe string material will be removed. Through the surface rotary table and other equipment, the electrode feeding mechanism is rotated to realize the circumferential cutting of downhole oil / casing.

[0056] In order to improve the cutting performance of stuck oil / casing string down...

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Abstract

The invention discloses a plasma cutting device and method for an underground oil casing. The plasma cutting device comprises an electrode, an electrode feeding mechanism and a guide shoe, the electrode is fixed to the electrode feeding mechanism, the electrode is arranged outwards in the radial direction, the guide shoe is connected to the axial lower end of the electrode feeding mechanism, and the electrode and the electrode feeding mechanism are both connected with a cable; the upper end of the electrode feeding mechanism is connected with a rotating mechanism; the upper end of the rotatingmechanism is connected with an upper centering mechanism; and a lower centering mechanism is further connected between the guide shoe and the electrode feeding mechanism. Strings are cut, the cuttingefficiency is high, and the success rate is high.

Description

technical field [0001] The invention relates to the technical field of downhole device cutting, in particular to a downhole oil casing plasma cutting device and method. Background technique [0002] Downhole pipe string stuck is one of the important reasons for oil well overhaul. For the stuck pipe string, salvage is mainly used to restore the casing channel. In the case of serious sand burial of the pipe string and the failure of the packer to be unsealed, etc., the fishing force will be too large, exceeding the tensile limit of the workover rig, fishing tools or the pipe string. In this case, the cutting and fishing method is generally adopted. Realize subsection salvage and reduce salvage force. At present, the main cutting methods in oil fields include mechanical cutting and sandblasting cutting. Mechanical cutting is the most traditional cutting method, which has problems such as severe tool wear, high cutting force, and low cutting efficiency; sandblasting cutting ha...

Claims

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Application Information

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IPC IPC(8): E21B29/00E21B29/02E21B17/10
CPCE21B29/002E21B29/02E21B17/1078
Inventor 张全胜张瑞霞张峰姜广彬刘永顺张化强周景彩田浩然崔晓梅
Owner CHINA PETROLEUM & CHEM CORP
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