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Throwing open type multi-cluster sliding sleeve

An open and sliding sleeve technology, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problems of not being able to provide enough production channels, limited number of sliding sleeves for construction pipe strings, and inability to continue to reach, etc.

Active Publication Date: 2013-03-20
CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After the current sliding sleeve is pushed by the ball to open the sliding sleeve, the ball seat intercepts the ball so that the ball cannot continue to reach the next sliding sleeve matching its size
Therefore, in the current staged fracturing process of multi-stage sliding sleeve packers, one ball can only open the corresponding unique ball sliding sleeve; at the same time, due to the limitation of the ball level difference, the number of sliding sleeves that can be carried by the construction pipe string is extremely limited. Often does not provide sufficient production access in horizontal wells with long horizontal sections

Method used

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  • Throwing open type multi-cluster sliding sleeve
  • Throwing open type multi-cluster sliding sleeve
  • Throwing open type multi-cluster sliding sleeve

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0014] Technical scheme of the present invention is: as figure 1 As shown, the ball-pitching open multi-cluster sliding sleeve includes an outer cylinder 1, an upper gland 2, a sealing ring 3, a set screw 4, a temporary blocking gland 5, a temporary blocking piece 6, shear nails 7, an inner sliding sleeve 8, Guide 10, combination ball seat 12, opening groove 13, spring 14, lower gland 16 and expander 17. Among them, the outer cylinder 1 has an upper joint (internal thread) and a lower joint (external thread), which are respectively used to connect the working pipe string; a number of drainage holes are evenly distributed in the circumferential direction near the upper joint; there is a circle of opening grooves 13 near the lower joint. The temporary blocking piece 6 is located in the drain hole 9 near the upper joint end of the outer cylin...

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Abstract

The invention discloses a throwing open type multi-cluster sliding sleeve for a staged fracturing tube bundle of a naked eye horizontal well, which mainly comprises an outer cylinder, a temporary shielding piece, an inner sliding sleeve, a guider, a combined ball seat and an expander. According to the invention, the ball opens the sliding sleeve and passes through the sliding sleeve smoothly, so that a plurality of multi-cluster sliding sleeves can be opened by throwing one time in the staged fracturing. The tool has the function of preventing sand blocking. A plurality of multi-cluster sliding sleeves in same configuration are matched in use so as to provide a circulation channel for production of a long well section horizontal well. Meanwhile, in the staged fracturing process of a multi-cluster sliding sleeve packer, the position and number of the throwing open type multi-cluster sliding sleeve can be selected, and the throwing open type multi-cluster sliding sleeve can be matched in use with a standard sliding sleeve to realize gradual operation of multi-stage separation, multipoint liquid inlet and discontinuous stage.

Description

technical field [0001] The invention relates to a downhole sliding sleeve device used in oil and gas well fracturing operations, which belongs to well completion and fracturing operations in oil fields, in particular to a ball-throwing open multi-cluster sliding sleeve. Background technique [0002] Multi-stage sliding sleeve packer staged fracturing is the leading completion method in staged fracturing of open-hole horizontal wells at present, which enables horizontal wells to simultaneously fracture multiple intervals without using bridge plugs for isolation. The ball sliding sleeve completion method is a well completion method that can be operated by mechanical and hydraulic methods. It uses sliding sleeves and expandable packers to isolate the horizontal section into several independent systems according to geological requirements. The balls are thrown in order, and the pressure is suppressed to open the sliding sleeve, so as to connect the layer where the sliding sleeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B34/06
CPCE21B34/063E21B33/12E21B34/14E21B34/142E21B34/103
Inventor 冯强李军李飞王瑶党伟李洪俊何志勇
Owner CHINA NAT PETROLEUM CORP
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