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Variable diameter ball seat type full diameter soluble fracturing sliding sleeve

A fracturing sliding sleeve and full-bore technology, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve problems such as complex operations of bridge plugs, and achieve a wide application range, simple structure, and reliable operation. Effect

Active Publication Date: 2019-01-04
CNPC BOHAI DRILLING ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a variable-diameter ball seat type full-diameter soluble fracturing sleeve, which solves the complex operation of drilling and removing the existing pumping bridge plug, and can be dissolved after the fracturing is completed. Remove the ball seat former and sealing ball in the wellbore to realize full-bore, infinite pole and large displacement fracturing, so as to improve the operation efficiency and reduce the operation cost

Method used

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  • Variable diameter ball seat type full diameter soluble fracturing sliding sleeve
  • Variable diameter ball seat type full diameter soluble fracturing sliding sleeve
  • Variable diameter ball seat type full diameter soluble fracturing sliding sleeve

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0025] Such as Figure 1-3 As shown, the variable-diameter ball seat type full-diameter soluble fracturing sleeve of the present invention includes a ball seat former II, a casing short I, and a soluble fracturing ball 9, and the casing short I includes a short body 1. The variable-diameter ball seat 2 of soluble material, the inner diameter of the short-circuit body 1 is a variable-diameter cylinder with small ends and a large middle, and the transition sections between the large-diameter section in the middle and the small-diameter sections at both ends are respectively provided with upper guiding slope sections 1-1 and the lower guide slope section 1-2; the lower part of the reducing ball seat 2 is an annular structure with multiple axial gaps 2-1, and the reducing ball seat 2 is fixed on the large part of the shorting body 1 by the fixing pi...

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Abstract

The invention discloses a variable diameter ball seat type full diameter soluble fracturing sliding sleeve. The variable diameter ball seat type full diameter soluble fracturing sliding sleeve comprises a ball seat forming machine, casing pipe short circuits, and a soluble fracturing ball. The ball seat forming machine is composed of a shell, a piston connecting rod, switch clips, a welding cylinder and springs. The lower portion of the piston connecting rod abuts against the welding cylinder connecting the switch clips. The springs are connected between the switch clips. When the ball sear forming machine is started, a piston moves downwards and pushes and breaks the welding cylinder, and the switch clips extend. The casing pipe short circuits comprise short circuit bodies and a variablediameter ball seat. The variable diameter ball seat is fixed to the casting pipe short circuits by pins, and enters a well with the casing pipe. The lower portion of the variable diameter ball seat isof a ring structure with a notch. Before fracturing operation, the switch clips of the ball seat forming machine capture the variable diameter ball seat, and pushes the variable diameter ball seat tocut off the fixing pins to move to the direction of the well bottom. Under influence of the reduced inclined planes of the casing pipe short circuits, the ring structure with the notch of the lower portion of the variable diameter ball seat can be gathered with the shrink diameter of the casing pipe short circuits, and diameter shrinking of the variable diameter ball seat is achieved.

Description

technical field [0001] The invention relates to the field of completion engineering of unconventional oil and gas reservoirs such as petroleum and natural gas, in particular to a variable-diameter ball seat type full-diameter soluble fracturing sliding sleeve for downhole fracturing. Background technique [0002] Unconventional oil and gas resources have entered the stage of history as an important successor of future oil and gas resources, but unconventional oil and gas reservoirs are characterized by tightness, low porosity, and low permeability. At present, the full-bore, large-displacement, and infinite-pole fracturing technology is an effective means to stimulate unconventional oil and gas reservoirs. [0003] For the exploitation of such unconventional oil and gas reservoirs, the combination of pumping bridge plug and perforation is mainly used for reservoir fracturing. Although this method can realize large-displacement, full-diameter, and infinite-pole fracturing, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/12
CPCE21B33/1208E21B43/26
Inventor 杨晓勇王益山冯强张鹏秦诗涛赵雷管云涛王莹
Owner CNPC BOHAI DRILLING ENG
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