US 12,326,067 B1
Infinite-stage fracturing sliding sleeve
Pingli Liu, Chengdu (CN); Xianzheng Zhao, Chengdu (CN); Fengming Jin, Chengdu (CN); Peng Wang, Chengdu (CN); and Jie Tang, Chengdu (CN)
Assigned to Southwest Petroleum University, Chengdu (CN); and ChengDu Sinoreal Technology Engineering Co., Ltd, Chengdu (CN)
Filed by Southwest Petroleum University, Chengdu (CN); and ChengDu Sinoreal Technology Engineering Co., Ltd, Chengdu (CN)
Filed on Feb. 17, 2025, as Appl. No. 19/055,084.
Claims priority of application No. 202411188271.4 (CN), filed on Aug. 28, 2024.
Int. Cl. E21B 34/14 (2006.01); E21B 43/26 (2006.01)
CPC E21B 34/142 (2020.05) [E21B 43/26 (2013.01); E21B 2200/04 (2020.05); E21B 2200/06 (2020.05)] 9 Claims
OG exemplary drawing
 
1. An infinite-stage fracturing sliding sleeve, comprising:
an outer cylinder, wherein a side wall of the outer cylinder is provided with radially arranged fracturing holes; a reduced diameter section and an expanded diameter section are provided inside the outer cylinder, an inner diameter of the expanded diameter section is greater than an inner diameter of the reduced diameter section, and the expanded diameter section is positioned at one end of the reduced diameter section far away from the fracturing holes;
an inner cylinder whose an outer wall is in a sealing connection with an inner wall of the outer cylinder and configured to close the fracturing hole, wherein the inner cylinder slides along an axial direction of the outer cylinder, and a first connection part is provided at one end of the inner cylinder facing the reduced diameter section;
a sliding cylinder whose an outer wall is in sliding and sealing connection with an inner wall of the reduced diameter section, wherein an upper end of the sliding cylinder is provided with a second connection part is connected to the first connection part, and a lower end of the sliding cylinder is provided with an elastic claw that moves radially; when the elastic claw is positioned in the reduced diameter section, a sealing ball seat matching a fracturing ball and configured to intercept the fracturing ball is formed, and when positioned in the expanded diameter section, the elastic claw expands radially outward, so that a size of a middle through hole is greater than a size of the fracturing ball;
a first elastic element configured to push the sliding cylinder to move towards the inner cylinder; and
a counting mechanism configured to count a number of times a fracturing ball passes through the sliding cylinder, wherein when the number of times the fracturing ball passes through the sliding cylinder is less than a preset value, a limit position of the sliding cylinder moving towards the inner cylinder is that the elastic claw is positioned in the reduced diameter section and the second connection part is positioned below the first connection part, and a limit position of the sliding cylinder moving away from the inner cylinder is that the elastic claw is positioned below the reduced diameter section, so that after entering the sliding cylinder, the fracturing ball drives the elastic claw to move from the reduced diameter section to the expanded diameter section, the fracturing ball is released, and after the fracturing ball is separated from the elastic claw, the elastic claw moves to the reduced diameter section; and when the number of times the fracturing ball passes through the sliding cylinder is equal to a preset value, a limit position of the sliding cylinder moving towards the inner cylinder is that the elastic claw is positioned in the reduced diameter section and the second connection part is connected to the first connection part, so that the inner cylinder is driven to move by the sliding cylinder, and a limit position of the sliding cylinder moving away from the inner cylinder is that the fracturing hole is opened and the elastic claw is positioned in the reduced diameter section.