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Compressing type subsealing packer

A packer, compression technology, applied in sealing/packing, production fluid, wellbore/well components, etc., can solve the problems of low construction efficiency, unable to meet the requirements of multiple stages of packer-driven fracturing, etc. The effect of unblocking

Active Publication Date: 2015-01-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the conventional fracturing packer in the prior art has low construction efficiency when used as a bottom seal packer and cannot meet the requirements of multi-stage drag fracturing when the packer goes down well at one time

Method used

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  • Compressing type subsealing packer
  • Compressing type subsealing packer
  • Compressing type subsealing packer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In order to overcome the problem that the conventional fracturing packer in the prior art is used as a bottom seal packer, the construction efficiency is low, and the problem that the packer cannot meet the requirements of multiple stages of dragging and fracturing when the packer goes down the well at one time, this embodiment provides a method such as figure 1 , figure 2 , image 3 The shown compression bottom seal packer includes a reversing centralizing mechanism, an anchoring mechanism and a sealing mechanism connected in sequence from bottom to top;

[0028] The reversing righting mechanism is composed of a lower joint 13, a guide center pipe 12, a guide pin 17, a guide pin carrier 11, a righting block 16, a righting block carrier 10 and a spring 9. The upper end of the lower joint 13 is connected with the lower end of the guide center pipe 12 connection, the outer wall of the lower end of the guide central tube 12 is provided with a "W" type reversing shallow g...

Embodiment 2

[0043]On the basis of Example 1, the working process of the compression-type bottom seal packer is as follows: the setting method of the packer is compression type, which is set by lifting up and down, and then lifting and unsealing.

[0044] Setting process:

[0045] When the packer enters the well, the guide pin 17 is located at the short track (point D) of the reversing shallow groove. At this time, the cone 6 is not in contact with the slips 15, and the packer will not be anchored. When it is lowered to the predetermined setting depth , lift the pipe string by 0.3m ~ 0.4m, and then lower the pipe string, the guide pin 17 will be located at the long track (point A) of the reversing shallow groove, the slips will be stretched and bit the casing wall, and 10 ~ 35kN will be applied The down pressure (reduction of the hanging weight of the pipe string wellhead) makes the inner center rod 1 of the packer compress the inner rubber tube 2 downward, and the inner center rod 1 pushe...

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Abstract

The invention belongs to the technical field of gas production of oilfields, and specifically provides a compressing type subsealing packer. The compressing type subsealing packer comprises a reversing centralizing mechanism, an anchoring mechanism and a sealing mechanism which are connected from bottom to top in sequence; the reversing centralizing mechanism comprises a lower connector, a guide center pipe, a guide pin, a guide pin carrier, a centralizing block, a centralizing block carrier and a spring; the anchoring mechanism comprises a slip box, a slip, a slip spring and a cone body; the sealing mechanism comprises a lower side ring, an outer rubber barrel, a center pipe, an inner rubber pipe, an inner center rod and a pressing cap. Compared with the general cracking packer, the compressing type subsealing packer has the advantages that the construction efficiency is high, the requirement for dragging and cracking a plurality of sections by feeding at a time can be met, and the problem that the working cost and risk are increased due to frequent putting out and feeding can be solved at the same time.

Description

technical field [0001] The invention belongs to the technical field of oilfield gas recovery, and in particular relates to a compression type bottom seal packer, which is suitable for dragging stage-by-stage fracturing reconstruction of oil and gas wells. Background technique [0002] There are many problems when conventional oilfield fracturing packers are used as bottom seal fracturing, mainly in the following two aspects: First, there will be a pressure difference between the upper and lower sides of the packer after fracturing, which is not conducive to the retraction of the packer rubber cylinder, resulting in Difficulty in unsealing; second, fracturing sand will inevitably be deposited on the packer during fracturing, which will make it difficult to unseal the packer. The flow channel (fracturing fluid outlet) will form a short circuit, and the sand washing fluid will not reach the sand settling on the packer rubber cylinder, resulting in unsatisfactory sand washing ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/128E21B33/129
CPCE21B33/1295E21B43/26
Inventor 任国富王在强桂捷邵媛蒙鑫任勇
Owner PETROCHINA CO LTD
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