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Unlocking and salvaging methods

A technology for unblocking and encountering jams, which is applied in earthwork drilling, wellbore/well components, etc., can solve problems such as low efficiency of unblocking and fishing, and achieve the effect of improving efficiency

Active Publication Date: 2020-04-10
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low efficiency of unblocking and salvaging in the related art, the present invention provides a method for unblocking and salvaging

Method used

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  • Unlocking and salvaging methods
  • Unlocking and salvaging methods
  • Unlocking and salvaging methods

Examples

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] figure 1 It is a schematic flow chart of a method for unblocking and fishing provided by an embodiment of the present invention, as shown in figure 1 As shown, the method may include:

[0043] Step 101, connect one end of the first drilling tool with the workover rig, and connect the other end with the undercut fishing part through the undercut device.

[0044] In the embodiment of the present invention, the workover rig can be a workover rig for small and medium workover in oil and water well production, and the workover rig for small workover has a small footprint and high flexibility in use. Specifically, the workover rig can be connected to one end of the first drilling tool through a hook, ring or elevator, and then the o...

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Abstract

The invention discloses a free fishing method, and belongs to the technical field of oil and gas exploitation. The method comprises the steps that a back-off fishing piece is tripped into a well through a first drilling tool, the back-off fishing piece is made to be connected with the top end of an over pulling tubular column, then one end of the first drilling tool is connected with one end of atop drive, and then the other end of the top drive is connected with a workover rig; the workover rig is controlled to lift the first drilling tool upwards with first bit pressure; the top drive is made to rotate at the first rotational speed so as to drive the first drilling tool, the back-off fishing piece and the over pulling tubular column to rotate; and in the rotating process of the top drive, the pump pressure of the top drive is controlled to be the preset pump pressure, when the increment of the rotational speed of the top drive is larger than the preset threshold value in a preset time period, the first drilling tool is lifted upwards through the workover rig, and the over pulling tubular column is taken out. In the free fishing process, a back-off device does not need to be rotated manually by operators, so that the free fishing efficiency is improved effectively. The free fishing method is used for free fishing of the tubular column.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a jam-free fishing method. Background technique [0002] During the production and operation of oil and water wells, if the downhole pipe string is stuck in the well due to improper operation or falling objects in the well, and cannot be lifted up in the normal way, it is necessary to use the jamming and fishing method to release and fish the stuck pipe string in time , to ensure the normal production of oil and water wells. [0003] In the related technology, when the stuck pipe string is unstuck and salvaged, the stuck pipe string is generally lifted up directly by the workover rig first. Connect with the undercut fishing part in sequence, then lower the undercut fishing part into the well, make the undercut fishing part connect with the top of the stuck pipe string, and finally make the pipe string at the upper part of the stuck point and the lower part by ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/00E21B29/00E21B31/18E21B31/20
CPCE21B29/00E21B31/00E21B31/18E21B31/20
Inventor 张玉生杜迎庆赵时光邢勇军赵亮
Owner PETROCHINA CO LTD
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