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Expanding type separate layer fracturing packer with anchoring function

A layered fracturing and expansion technology, which is applied in the direction of sealing/isolation, production fluid, wellbore/well components, etc., can solve the problem that layered fracturing tools cannot be lowered, and reduce the risk of unblocking , increase the expansion ratio, improve the effect of pressure bearing capacity

Inactive Publication Date: 2021-04-20
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a small-diameter, high-expansion-ratio expansion-type layered fracturing packer with an anchoring function and its use method, which solves the problem that conventional size layered fracturing tools in casing variable wells cannot Difficulties in drilling down; realize layered fracturing of casing variable wells, efficiently stimulate reservoirs, and increase single well production

Method used

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  • Expanding type separate layer fracturing packer with anchoring function
  • Expanding type separate layer fracturing packer with anchoring function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, the center pipe 7 adopts a standard 2 3 / 8-P110 flat oil pipe, and the two ends of the center pipe 7 are respectively connected to the upper joint 1 and the lower joint 12 through 2 3 / 8 TBG oil pipe threads.

[0033] For the layered fracturing packer of the present invention, since the center pipe adopts the standard 2 3 / 8-P110 flat oil pipe, the center pipe meets the requirements of tightness and erosion resistance, so that the outer diameter of the packer is within the design Make it as small as possible, so that the packer can shrink the well section through casing deformation, and smoothly go down to the design well depth, so as to meet the needs of casing-variable well layered fracturing.

Embodiment 2

[0035] like figure 1 As shown, both ends of the steel strip 6 are pressed against the steel strip seat 4, and the material of the steel strip 6 is a stainless steel material with high elasticity and small residual deformation.

[0036] The layered fracturing packer of the present invention, because the steel strip is made of stainless steel with high elasticity and small residual deformation, can meet the requirement of high expansion ratio, and at the same time facilitate the extraction of the pipe string after fracturing.

Embodiment 3

[0038] On the basis of Example 2, the rubber tube 8 is divided into inner and outer layers, vulcanized on both sides of the steel belt 6 . The inner vulcanized rubber completely covers the steel belt seat 4 at both ends, the outer vulcanized rubber is shorter, and part of the steel belt is exposed; the steel belt seat 4 is respectively connected with the upper rubber barrel seat 5 and the lower rubber barrel seat 9 through threads, and the upper rubber barrel The seat 5 is fixed on the upper joint 1 through threaded connection, the lower rubber tube seat 9 is connected to the external thread of the floating head 10, the floating head 10 is passed on the central tube 7, and the smallest inner wall of the floating head 10 is provided with an apron groove, which can It forms a dynamic sealing fit with the outer wall of the central tube 7 to form a "floating down" compensation structure.

[0039] In the layered fracturing packer of the present invention, because the packer adopts th...

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Abstract

The invention discloses an expanding type separate layer fracturing packer with an anchoring function. The expanding type separate layer fracturing packer comprises an upper connector, a steel belt seat, an upper rubber cylinder seat, a steel belt, a central pipe, a rubber cylinder, a lower rubber cylinder seat, a floating head and a lower connector, wherein the two ends of the steel belt are pressed on the steel belt seat, the rubber cylinder is divided into an inner layer and an outer layer and vulcanized on the two sides of the steel belt, the steel belt seat is connected with the upper rubber cylinder seat and the lower rubber cylinder seat, and sealing rings are arranged on the connecting faces; the upper rubber cylinder seat is connected to an external thread of the upper connector, the lower rubber cylinder seat is connected to an external thread of the floating head, and sealing rings are arranged on the connecting faces; the floating head penetrates through the central pipe, and a sealing ring is arranged on the matching face; and the upper end of the central pipe is in threaded connection with the upper connector through an oil pipe, the lower end of the central pipe is in threaded connection with the lower connector through an oil pipe, and two sets of kerf liquid inlet holes are further formed in the central pipe. The expanding type separate layer fracturing packer has the advantages of being small in outer diameter, high in expansion ratio, good in pressure bearing performance and capable of meeting the requirement for separate layer fracturing transformation of a casing deformation well, and having the anchoring function.

Description

technical field [0001] The invention relates to a layered fracturing packer, in particular to an expansion type layered fracturing packer with an anchoring function. Background technique [0002] Generally, oil and gas reservoirs with low porosity and low permeability need fracturing to obtain productivity. When an oil and gas well encounters casing deformation and the inner diameter shrinks, conventional size layered fracturing tools such as hydraulic anchors and K344 packers will not be able to run normally. Especially when the reduced-diameter well section of the oil and gas well is in the upper part of the reservoir, the joint pressure will not be able to fully and effectively carry out reservoir stimulation, and the single well production will be low. Even if some oil and gas wells cannot be reconstructed, they will not be able to seek production, resulting in a waste of investment. [0003] Publication No. CN202531093U discloses an expandable K344 packer, which is de...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B33/122E21B43/14
Inventor 陈保山丁柯宇冯强黄敏刘亚龙王学正崔振锚杨永青张华雷中清关键
Owner CNPC BOHAI DRILLING ENG
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