Full-diameter switchable slide sleeve for fracturing and using method thereof

Abstract

The invention specifically relates to a full-diameter switchable slide sleeve for fracturing and a using method thereof. The full-diameter switchable slide sleeve for fracturing includes an upper connector, a lower connector, a slide sleeve body, and an outer slide sleeve, wherein the upper connector and the lower connector are connected to the upper end and the lower end of the slide sleeve body;and the outer slide sleeve is located on the outer side of the slide sleeve body and rotatably connected with the slide sleeve body. The full-diameter switchable slide sleeve for fracturing is characterized in that ring-shaped grooves are formed in the slide groove body and the outer slide sleeve correspondingly; a driven gear is arranged on the outer slide sleeve, and a driving gear for drivingthe driven gear is arranged on the slide sleeve body; and a driving device for driving the driving gear to rotate is further included. According to the full-diameter switchable slide sleeve for fracturing and the using method thereof, a moving part sleeves the outer side of the slide sleeve, during fracturing, a high-pressure fluid does not impact the moving part of the slide sleeve.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to the improvement of a fracturing sliding sleeve commonly used in various production stimulation operations, in particular to a full-diameter switchable fracturing sliding sleeve and a method for using the same. Background technique [0002] In recent years, with the increasing maturity of horizontal well technology, staged fracturing technology has become an important means of oil and gas resource exploitation in my country, and is mainly used in fracturing stimulation of low permeability oil and gas reservoirs and tight oil and gas. As the core tool for reservoir communication / isolation and reservoir management, the sliding sleeve plays an important role in the staged fracturing technology, and the sliding sleeve staged fracturing process is also one of the most widely used pressure dividing processes. At present, the sliding sleeves for staged frac...

AI Technical Summary

Problems solved by technology

However, the multi-stage pitching sleeve also has the following problems: 1) Due to the restriction of a certain level difference between the fracturing ball and the ball seat, it is impossible to realize infinite staged fracturing

2) The sliding sleeve can only be opened by hydraulic pressure, it cannot be closed, and it cannot be controlled after the oil and gas wells come out of water

3) The fracturing ball is affected by the medium in the wellbore, so the ball seat cannot be effectively sealed, and sometimes it cannot be opened effectively

5) The structure of the inner cylinder of the sliding sleeve is complicated, and there are many mechanical moving parts, convex grooves, and steps. The high-pressure fluid medium is easy to cause damage to the ball seat and mechanical moving parts, resulting in construction accidents

6) The necking of the inner diameter of the sliding sleeve will have a throttling effect on the fracturing fluid, and will increase the construction friction, and the construction displacement is limited, which cannot meet the technical requirements of large displacement in volume fracturing

The above-mentioned multiple defects will directly lead to an increase in the additional workload of subsequent well completion and workover work, and also increase the difficulty and risk of the operation

[0003] The conventional sliding sleeve opens and closes the sliding sleeve through the corresponding mechanical movement of the inner sliding sleeve inside the sliding sleeve, and the inner cylinder of the conventional sliding sleeve has a complex structure, including many ball seats, convex grooves and mechanical moving parts, and the fracturing During construction, the high-pressure mixed fluid medium will impact the convex groove of the inner sliding sleeve inside the sliding sleeve and the mechanical moving parts, which will cause the sliding sleeve to fail to open and close normally, resulting in fracturing construction accidents and affecting the efficiency of fracturing construction

[0004] In the prior art "rotary full-bore fracturing switch", the sliding sleeve is still inside. Although the inner cylinder also has a rotating mechanism, the rotating mechanism will eventually drive the inner sliding sleeve to move axially, that is, through the inner sliding sleeve. Axial movement is used to realize the opening and closing of the sliding sleeve; and its rotating mechanism is relatively complicated, and shear pins are needed to drive the inner cylinder of the sliding sleeve to achieve axial movement; and the rotating mechanism and the inner sliding sleeve are two independent mechanisms

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