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Drillable ball injection sliding sleeve suitable for horizontal well

A ball-throwing sliding sleeve and horizontal well technology, which is applied in earth-moving drilling, wellbore/well components, sealing/packing, etc. Well production, saving construction costs, and highly targeted effects

Active Publication Date: 2013-04-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, horizontal well drilling and completion technology is an advanced technology to increase single well production and efficiently develop low-permeability oil and gas fields. It is necessary to use packer strings to implement mechanical isolation and segmental reconstruction of the horizontal open hole section, and the drillable ball-throwing sleeve is an important supporting tool in the packer string, which is placed between the two packers. During production stimulation and well completion, reliable liquid inlet and gas production channels are provided for the operation target layer; most of the ball-pitching sleeves currently used in the field can only be used in vertical wells and inclined wells, and the ball-pitching sleeves cannot be self-locked after opening. Sometimes the sliding sleeve cannot be opened normally due to the fact that the steel ball cannot smoothly enter the ball seat and the sand in the sliding sleeve in the horizontal section. Increased by drilling and grinding, these problems will affect fluid drainage and later completion of gas recovery

Method used

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  • Drillable ball injection sliding sleeve suitable for horizontal well

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The present invention includes a joint device and a claw tube structure. The joint device is composed of an upper joint 1 and a lower joint 9. The upper joint 1 and the lower joint 9 are connected together by threads. Screw 6, therefore can realize the fixation after connection of upper and lower joints 1 and 9, the inner circle of the upper end of the upper joint is provided with an upper positioning groove, a lower positioning groove 12 and a side hole 13; 3, the claw tube 3 is arranged in the upper and lower joints 1 and 9, the upper end of the claw tube 3 is provided with a claw 11, there is a gap between the claws 11, and the claw tube 3 and the upper joint 1 are opened by The shear pin 4 and the anti-rotation pin 5 are connected and fixed, and the opening shear pin 4 and the anti-rotation pin 5 connecting the fixed claw tube 3 and the upper joint 1 can realize the axial and circumferential direction between the elastic claw tube 3 and the upper joint 1 Fixed; in o...

Embodiment 2

[0016] The installation sequence of the present invention is: first the seal rings 7 and 2 are respectively placed on the outer circle of the ball seat 8 and the claw tube 3, and the ball seat 8 is connected to the lower end of the claw tube 3, and then the claw tube 3 is Insert it into place from the upper end of the upper joint, install the opening shear pin 4 and the anti-rotation pin 5 at the same time, finally connect the lower joint 9 to the upper joint 1, and tighten the fixing screw 6, thus completing the installation work of the present invention. Completed the preparations for putting into use;

Embodiment 3

[0018] During construction, according to the technical requirements of the staged production increase of the horizontal open-hole well, the claw tube 3 in the sliding sleeve is pressed down by throwing a ball, and the claw boss 10 provided at the upper end of the claw tube 3 is forced to shrink and go down, from the upper joint The upper positioning groove enters the lower positioning groove 12, and the claw tube 3 is locked in reverse, and cannot move upward. At this time, the gap left between the claws 11 is facing the side hole 13 of the upper joint, realizing the ball-type sliding sleeve The opening of the opening, the establishment of the liquid inlet channel for different transformation layers, the opening ball put in is located on the ball seat 8 of the sliding sleeve; The side hole 13 channels flow back, and the special ball for opening the sliding sleeve also flows back from the tubing to the ball catcher on the surface pipeline along with the liquid or gas; if the cha...

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Abstract

The invention provides a drillable ball injection sliding sleeve suitable for a horizontal well, belonging to the technical field of manufacturing downhole tools in oil and gas industry. The invention adopts a design way of opening before locking, and provides a drillable ball injection sliding sleeve suitable for a horizontal well which comprises a joint device and an elastic claw tube structure, wherein the upper joint and the lower joint of the joint device is connected by a thread; and the elastic claw tube structure is composed of elastic claw tubes. The invention overcomes the problems that the ball injection sliding sleeve in the prior art can not be self-locked after being opened, the ball seat can not be drilled, circumferential fixation does not exist and drilling and grinding can not be realized. The invention has the advantages of large designed outer diameter and relatively small level difference of seatbores and has operation tubular columns which can finish eight layer sections after combination.

Description

technical field [0001] The utility model relates to a drillable ball-pitching sliding sleeve suitable for horizontal wells, which is used for the staged transformation construction of the open-hole completion technology of horizontal wells, and belongs to the technical field of downhole tool manufacturing in the petroleum and natural gas industry. Background technique [0002] At present, horizontal well drilling and completion technology is an advanced technology to increase single well production and efficiently develop low-permeability oil and gas fields. It is necessary to use packer strings to implement mechanical isolation and segmental reconstruction of the horizontal open hole section, and the drillable ball-throwing sleeve is an important supporting tool in the packer string, which is placed between the two packers. During production stimulation and well completion, reliable liquid inlet and gas production channels are provided for the operation target layer; most o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/128
Inventor 张道鹏周正潘勇刘运楼黎宗琪张剑钟兴久黄煜鹏
Owner BC P INC CHINA NAT PETROLEUM CORP
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