Multi-stage fracturing sliding sleeve device and using method thereof

Abstract

The invention relates to a multi-stage fracturing sliding sleeve device and a using method thereof. The multi-stage fracturing sliding sleeve device is characterized by comprising an upper pipe column joint, a sleeve body, a lower pipe column joint, a switch sleeve and a reducing tee, wherein the lower part of the upper pipe column joint is connected with the upper part of the sleeve body; the lower part of the sleeve body is connected with the upper part of the lower pipe column joint; the sleeve body is in a circular barrel shape; a plurality of side holes are formed at the circumference near the upper position of the sleeve body at intervals; a circle of steps are formed at the inner side near to the lower position of the sleeve body; the switch sleeve which is also in a circular barrel shape is arranged in the sleeve body and below the upper pipe column joint and is fixed with the sleeve body through a plurality of pins; the inner diameter of the lower part of the switch sleeve is larger than that of the upper part of the switch sleeve; the reducing tee is arranged at the inner lower part of the switch sleeve; the circumference of the upper part of the reducing tee is fixedly connected with the switch sleeve through the plurality of pins; a plurality of cutting slits are formed at the lower part of the reducing tee; sealing mediums are filled in each cutting slit; the top of the lower pipe column joint is in a taper shape; a circle of steps bulging inwards are arranged at the bottom of the reducing tee, and the outer diameter of the top of the lower pipe column joint is smaller than that of the bottom of the reducing tee.

Description

technical field [0001] The invention relates to a supporting device for a fracturing pipe string and a method for using the same, in particular to a multi-stage fracturing sliding sleeve device used on a fracturing pipe string for exploiting shale gas reservoirs / tight sandstone reservoirs and its application method. Instructions. Background technique [0002] The traditional packer+sliding sleeve fracturing technology uses a plugging ball to open a sliding sleeve to complete the first-level hydraulic fracturing. The function of the sliding sleeve not only needs to open the circulation channel for fracturing fluid to be injected into the formation, but also cooperate with the plugging ball to change the flow direction of the fracturing fluid, and realize the fracturing operation of the formation together with the packer in place under pressure. . Since the plugging ball is limited by the inner diameter of the fracturing string, the number of fracturing sleeves that can be o...

AI Technical Summary

Problems solved by technology

Because the plugging ball is limited by the inner diameter of the fracturing string, the number of fracturing sleeves that can be opened in one fracturing string is often very limited

As the permeability of oil and gas resources is getting lower and lower, more and more stages of fracturing are required. Therefore, the traditional fracturing sleeve can no longer meet the requirements of modern fracturing technology.

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