Self-sealing dual-channel hydraulic control stepless fracturing sliding sleeve device

Abstract

The invention belongs to the technical field of petroleum engineering, and discloses a self-sealing dual-channel liquid-controlled stepless fracturing sliding sleeve device, which includes an upper distribution joint, an inner central pipe connected to the upper distribution joint, an outer central pipe, an outer sleeve, and a lower part of the outer sleeve The upper pressure ring, the piston between the upper pressure ring and the outer central tube, the locking ring retaining ring at the lower part of the outer sleeve, the locking ring on the piston, the spacer ring, the rubber sleeve, and the lower pressure ring arranged in sequence under the upper pressure ring , sliding sleeve, lower joint and distribution sleeve, the lower pressure ring is connected between the outer central tube and the distribution sleeve, the sliding sleeve is connected between the lower end of the inner central tube and the distribution sleeve, and the lower joint is connected to the lower end of the distribution sleeve. This technical solution realizes the integrated design of packer and sliding sleeve, reduces the connection between tools, improves the reliability of tools, saves construction costs, and improves the efficiency of multi-stage fracturing. In addition to the conventional large-diameter oil flow channel, it also has an independent first Two hydraulic control channels realize the hydraulic control of downhole tools at the wellhead without affecting the normal delivery of oil.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, and relates to a self-isolating dual-channel hydraulically controlled stepless fracturing sliding sleeve device, which realizes stepless subsection fracturing, reduces fracturing cost and improves fracturing operation reliability. Background technique [0002] The existing multi-stage staged fracturing process mainly connects the packer with the ball-throwing sliding sleeve, and the packer is set and the sliding sleeve is opened by putting the fracturing ball into the fracturing string and pressing it, so as to realize different oil layers. This multi-stage staged fracturing process not only needs to connect the packer and the ball sliding sleeve together through the oil pipe, but also needs to put the fracturing ball to open the sliding sleeve, which has low reliability and is easy to cause Downhole tool connection failure, limited number of segments, high operating costs, high ris...

AI Technical Summary

Problems solved by technology

[0002] The existing multi-stage staged fracturing process is mainly to connect the packer and the ball-throwing sleeve, and set the packer and open the sleeve by putting fracturing balls into the fracturing string and pressing the sleeve, so as to realize the separation of different oil layers. This multi-stage staged fracturing process not only needs to connect the packer and the ball-pitching sleeve through the tubing, but also requires the injection of fracturing balls to open the sleeve, which has low reliability and is easy to cause Downhole tool connection failure, limited number of sections, high operating costs, high risks, etc.

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