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Back-inserting cementing sealing device and back-inserting cementing method

A sealing device and well cementing technology, which is applied in sealing/isolation, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of easy-drilling bridge plugs, difficult drilling and removal, complex back-insertion cementing procedures, and high operating costs. problems, to achieve the effect of reducing on-site construction risks, shortening the operation process, and reducing the amount of use

Active Publication Date: 2015-11-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a back-insertion cementing sealing device and a back-insertion cementing method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the current problem of back-insertion cementing. The insertion and cementing process is complicated, the operation risk is high, the operation cost is high, and the bridge plug is easy to drill and difficult to drill and remove.

Method used

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  • Back-inserting cementing sealing device and back-inserting cementing method
  • Back-inserting cementing sealing device and back-inserting cementing method
  • Back-inserting cementing sealing device and back-inserting cementing method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, as attached figure 1 , 2 , 3, the plug-back cementing sealing device 9 includes a body 1 and a guide head 2; the body 1 is tubular, the guide head 2 is a cone with a large upper part and a smaller bottom, and the lower end of the guide head 2 is a round head. An installation tube 3 is integrally fixed on the outer side of the upper end, the lower end of the body 1 is fixedly installed with the installation tube 3, and the first combination sealing device 4 and the second combination sealing device 5 are fixedly installed on the upper outer wall of the body 1 from top to bottom. The third combined sealing device 6 and the fourth combined sealing device 7 are fixedly installed on the lower outer wall of the body 1 from top to bottom, and are arranged along the circumference on the body 1 between the second combined sealing device 5 and the third combined sealing device 6 There is at least one pressure transmission hole 8 . The guide head 2 is a cone wi...

Embodiment 2

[0028] Embodiment 2, as attached figure 1 , 2 , 3, as preferred embodiment 1, the first combined sealing device 4, the second combined sealing device 5, the third combined sealing device 6 and the fourth combined sealing device 7 all include an upper fixed sleeve 11, an upper connecting sleeve 12 , the sealing device 13, the lower connecting sleeve 14 and the lower fixing sleeve 15; on the lower inner wall of the upper fixing sleeve 11, on the upper outer wall of the upper connecting sleeve 12, on the lower outer wall of the lower connecting sleeve 14, on the upper inner wall of the lower fixing sleeve 15 There are installation grooves, the installation groove of the upper fixed sleeve 11 is fixedly installed with the installation groove of the upper connection sleeve 12, the installation groove of the lower connection sleeve 14 is fixedly installed with the installation groove of the lower fixed sleeve 15, and the upper fixed sleeve 11 and the installation groove of the l...

Embodiment 3

[0029] Embodiment 3, according to needs, as a preference of Embodiment 2, the upper fixing sleeve 11 and the lower fixing sleeve 15 are respectively fixed and installed with the main body 1 by screws or pins.

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Abstract

The invention relates to the technical field of back-inserting well cementation, in particular to back-inserting cementing sealing device and a back-inserting cementing method. The back-inserting cementing sealing device comprises a body, a guide head and combined seals; the body is tubular in shape; the guide head is in the shape of a cone big end up; the lower end of the guide head is a round head; a mounting tube is integrally fixed to the outer side of the upper end of the guide head; the lower end of the body and the mounting tube are fixedly mounted together; the first combined seal and the second combined seal are fixedly mounted on the outer wall of the upper portion of the body from top to bottom; the third combined seal and the fourth combined seal are fixedly mounted on the outer wall of the lower portion of the body from top to bottom. After the back-inserting cementing sealing device is used in back-inserting well cementation, using a temporary plugging tool, an easy-drilling bridge plug, is not required, and the guide head is easy to drill off; thus, operational procedure can be simplified, operational flow can be greatly shortened, field devices are fewer, less personnel is used, field construction risk is thereby greatly reduced, and operational cost is also greatly reduced.

Description

technical field [0001] The invention relates to the technical field of back-insertion cementing, and relates to a back-insertion cementing sealing device and a back-insertion cementing method. Background technique [0002] With the continuous increase of the development scale of low-permeability oil and gas resources, the oil and gas well segmented reconstruction technology has become one of the important technical means to reverse the low production of many wells and realize the high production of few wells in low permeability oil and gas fields. In the staged reconstruction of oil and gas wells, the upper well section is usually cemented with a liner hanger. After the cementing operation, the easy-to-drill bridge plug is used to set the seal in the tailpipe at the lower part of the liner hanger to isolate the upper and lower well sections. Conventional back-insertion joints are used to seal the upper well section. After the cementing operation is completed, the ash plug an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
Inventor 张胜鹏李晓军彭伟李富强张昕伍伟
Owner BC P INC CHINA NAT PETROLEUM CORP