Variable diameter ball seat type full diameter soluble fracturing sliding sleeve

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...

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

Images