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Packer for realizing infinite fracturing and working method thereof

A packer, infinite-level technology, applied in the field of oilfield development tools, can solve the problem that the packer cannot be reused, and achieve the effect of improving production efficiency

Pending Publication Date: 2018-01-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of packer cannot be reused in downhole operations

Method used

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  • Packer for realizing infinite fracturing and working method thereof
  • Packer for realizing infinite fracturing and working method thereof
  • Packer for realizing infinite fracturing and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 2 , Figure 7-Figure 9 shown.

[0042] A packer for realizing infinite-stage fracturing, which is used for multi-stage fracturing or infinite-stage fracturing, including a center pipe 4-9, a liner 4-8 and a sealing mechanism that are sequentially socketed from inside to outside; The sealing mechanism includes a piston 4-7, a sealing sleeve 4-14 and a lower joint 4-15 connected in sequence; the sealing mechanism forms a sealing cavity on the outer wall of the central tube 4-9 and the liner 4-8; A locking ring sleeve 4-10 and an unsealing ring sleeve 4-13 are arranged in the sealing chamber, the locking ring sleeve 4-10 is fixedly socketed with the liner 4-8, and the unsealing ring sleeve 4-13 13 is fixedly socketed with the central tube 4-9; one side of the piston 4-7 is provided with an elastic mechanism to reset the piston 4-7; the outer wall of the locking ring 4-10 is provided with a lock Tighten the clamping plate 4-11; the inner wall of the seali...

Embodiment 2

[0046] As described in Example 1, the packer for realizing infinite fracturing, further, the elastic mechanism includes two long rubber cylinders 4-4 and one short rubber cylinder 4-6, and the adjacent rubber cylinders are arranged between There is a spacer ring 4-5; the spacer ring 4-5 is socket-connected with the liner 4-8; the rubber tube and the spacer 4-5 are slidably arranged on the outer wall of the liner 4-8.

Embodiment 3

[0048]As described in Example 1 to realize the packer for infinite stage fracturing, further, the end of the central pipe is provided with an upper joint 4-1 corresponding to the lower joint 4-15; the retaining ring 4- One side of 3 is provided with an adjustment ring 4-2; the adjustment ring 4-2 is connected with the upper joint thread 4-1. The adjusting ring 4-2 is used to adjust the squeezed degree of the rubber cartridge, thereby changing the outer diameter of the rubber cartridge, so as to meet the sealing requirements of pipes with different diameters.

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Abstract

The invention relates to a packer for realizing infinite fracturing and a working method thereof. The packer comprises a central pipe, a lining pipe and a sealing mechanism which are sequentially connected in a sleeving way from inside to outside, wherein the sealing mechanism comprises a piston, a sealing sleeve and a lower joint which are sequentially connected; sealing cavities are defined by the sealing mechanism on the outer side walls of the central pipe and the lining pipe; the sealing cavities are internally provided with locking ring sleeves and unsealing ring sleeves. According to the packer for realizing the infinite fracturing, disclosed by the invention, hydraulically controlled sealing and unsealing are realized by adopting a novel mechanism; a traditional sealing pin and a traditional unsealing pin are prevented from being used, repeated sealing and unsealing of the packer are facilitated, and the infinite fracturing is further realized; the stability of the packer is increased to a large extent, and the production efficiency of a whole fracturing process is increased.

Description

technical field [0001] The invention relates to a packer for realizing infinite stage fracturing and a working method thereof, belonging to the technical field of oil field development tools. Background technique [0002] Most of the oil fields in our country belong to heterogeneous multi-reservoir. During the development process, there are great differences in the production, pressure and water absorption capacity of each oil layer. How to rationally develop multi-layer oil fields and increase the recovery rate to achieve sustainable development Requirements have always been an important research topic. [0003] Since the 1980s, after years of experimental research in my country, the use of horizontal well fracturing to increase production has been realized, which has changed the passive situation of introducing foreign technology, converted a large number of unrecoverable reserves into recoverable reserves, and used horizontal wells to treat low-permeability oil and gas re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/128E21B43/26
Inventor 罗明良杨柳温庆志巩锦程杨宗梅贾国旭马海洋薄江伟李钦朋罗帅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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