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

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

Example Embodiment

[0031]Example 1

[0032]Such asfigure 1 As shown, the central tube 7 is connected to the upper joint 1 and the lower joint 12 by two ends of the center tube 7 by a standard 2 3 / 8-P110 planar tube.

[0033]The layered fracturing sealing sealing sector of the present invention has used a standard 2 3 / 8-P110 flat oil pipe using a standard 2 3 / 8-P110 planar tube, and the central tube is satisfied with the sealing and resistance to the outer diameter of the sealing. When it is as small as possible, the packer can be able to achieve the design well through the sleeve deformation, so as to meet the designed wells, thereby meeting the need for a hierarchical fracturing.

Example Embodiment

[0034]Example 2

[0035]Such asfigure 1 As shown, the steel belt 6 is compressed on the steel belt 4, and the steel strip 6 is made of a stainless steel material having a small elasticity and residual deformation.

[0036]The layered fracturing sealing sealing sealing sector of the present invention can satisfy the high expansion ratio requirements due to the high elasticity of the steel strip, the amount of stainless steel having a small residual deformation, is also convenient for the high expansion ratio requirements.

Example Embodiment

[0037]Example 3

[0038]Based on Example 2, the rubber cylinder 8 is divided into internal, outer layers, and vulcanized on both sides of the steel strip 6. Inner sulfurized rubber The two ends of the steel strap 4 are completely capped, and the outer vulcanized rubber is short, and some steel belts are exposed; the steel seat 4 is connected to the upper capsule 5 and the lower capsule 9, respectively, and the upper rubber The seat 5 is secured to the upper joint 1 by a threaded connection, and the lower rubber base 9 is connected to the outer thread of the floating head 10, and the floating head 10 is in the center tube 7, and the smallest inner wall of the floating head 10 is provided with a film groove. Forming a dynamic seal with the outer wall of the center tube 7 to form a "down floating" compensation structure.

[0039]The layered fracturing sealing sealing sealing sealing sealing sector is greatly improved by the packer adopting the lower end "floating" compensation structure, mak...

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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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