Workover operation method and system

An operation system and workover technology, which is applied in earth-moving drilling, wellbore/well components, sealing/packing, etc. Inexpensive, reliable sealing effect

Inactive Publication Date: 2018-07-10
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor economy and flexibility of workover operations in the prior art, the embodiment of the present invention provides a method and system for workover operations

Method used

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  • Workover operation method and system

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Embodiment Construction

[0037] 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.

[0038] figure 1 Shown is a flow chart of a workover operation method provided by an embodiment of the present invention, which is applied to the workover operation system provided by an embodiment of the present invention, such as figure 1 As shown, the workover method includes the following steps:

[0039] Step 101. Lower one end of the drilling tool into the casing to be repaired in the oil well through the rotary blowout preventer. The rotary blowout preventer is set at the wellhead of the oil well. The rotary blowout preventer is used to seal the gap between the drilling tool and the casing to be repaired The other end of the drilling tool is connected to the top drive.

[0040] Step 102 , driven by the top drive, the drilling to...

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Abstract

The invention discloses a workover operation method and system, and belongs to the field of workover. The workover operation method comprises the following steps that one end of a drill tool penetrates through a rotary blowout preventer to be tripped into a to-be-repaired sleeve in an oil well, the rotary blowout preventer is arranged at a wellhead of the oil well, the rotary blowout preventer isused for sealing an annular space between the drilling tool and the to-be-repaired sleeve, and the other end of the drilling tool is connected with a top drive; and under driving of the top drive, thedrilling tool rotates and mill the to-be-repaired sleeve. According to the workover operation method and system, the drilling tool is driven by the top drive to rotate and mill the to-be-repaired sleeve in the oil well so as to conduct workover operation, and due to the fact that the top drive is low in price, small in weight and easy to transfer, the economy and flexibility of workover operationare improved; and meanwhile, the rotary blowout preventer is utilized to seal the annular space between the drilling tool and the sleeve, so that reliable sealing of the annular space can be ensuredduring workover operation, and hidden danger of the environment and safety due to liquid overflow in the annular space is prevented.

Description

technical field [0001] The invention relates to the field of well workover, in particular to a well workover operation method and system. Background technique [0002] After the oil well is put into production, the casing in the oil well may be clogged, the inner diameter becomes smaller, etc., which will cause some production tools to fail to run into the oil well through the casing, resulting in the failure of the oil well to produce normally. In this case, it is necessary to carry out workover operations, that is, to repair the casing of the oil well. In the workover operation, it is necessary to use the drilling tool to mill the casing to remove the blockage of the casing and expand the inner diameter of the casing, so as to ensure that the production tools can be lowered into the oil well through the casing. [0003] In related technologies, workover operations generally require the use of large-scale workover equipment equipped with special tools such as overhaul dril...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/10E21B33/06
Inventor 孙建军温少啟范须华郭世立王宁
Owner PETROCHINA CO LTD
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