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A compression bottom seal 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: 2016-08-24
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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  • A compression bottom seal packer
  • A compression bottom seal packer
  • A compression bottom seal 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 packer, the construction efficiency is low, and it cannot meet the requirements of the packer to drive the fracturing for multiple stages at one time. This embodiment provides a method such as figure 1 , figure 2 , image 3 The shown compression bottom packer includes a reversing and centralizing mechanism, an anchoring mechanism and a sealing mechanism that are sequentially connected from bottom to top;

[0028] The reversing and centralizing mechanism is composed of a lower joint 13, a guiding central tube 12, a guiding pin 17, a guiding pin carrier 11, a centralizing block 16, a centralizing block carrier 10, and a spring 9. The upper end of the lower joint 13 and the lower end of the guiding central pipe 12 In connection, the outer wall of the lower end of the guide center tube 12 is provided with a "W"-shaped reversing shallow groove, the guide pin carrier 11 i...

Embodiment 2

[0043] On the basis of Example 1, the working process of the compression bottom packer is as follows: the setting method of the packer is a compression type, and the packer is set up and down, and then up and unsealed.

[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 and the slip 15 are not in contact, and the packer will not be anchored. When it reaches the predetermined setting depth , Raise the pipe string 0.3m~0.4m, 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 propped up and bite the casing wall, apply 10~35kN The downward pressure (the suspension weight of the string wellhead is reduced) causes the inner center rod 1 of the packer to compress the inner rubber cylinder 2 downwards, and the inner center rod 1 pushes the center tube 3 to continue to move ...

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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 production, and specifically relates to a compression type bottom packer, which is suitable for section-by-section fracturing transformation of oil and gas wells. Background technique [0002] Conventional fracturing packers in oilfields have many problems when used as bottom seal fracturing, which are mainly manifested in the following two aspects: First, there will be a pressure difference between the upper and lower packers after fracturing, which is not conducive to the shrinkage of the packer’s rubber cylinder, resulting in Unblocking is difficult; second, fracturing sand will inevitably deposit on the packer during fracturing, which will make it difficult to unblock the packer. At this time, it is necessary to circulate the well to flush the sand, but because there is liquid on the upper part of the packer The flow channel (fracturing fluid outlet) will form a short circuit, and the sand flu...

Claims

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Application Information

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Patent Type & Authority Patents(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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