US 11,933,138 B2
Sliding sleeve device
Zhimin Hou, Sichuan (CN); Dan Hu, Sichuan (CN); Qiang Wang, Sichuan (CN); Yijun Zhou, Sichuan (CN); Jiang Qian, Sichuan (CN); Chen Chen, Sichuan (CN); Tao Liu, Sichuan (CN); Jianfa Ci, Sichuan (CN); Wenfeng Pang, Sichuan (CN); and Wenjiang Teng, Sichuan (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and SINOPEC SOUTHWEST OIL & GAS COMPANY, Sichuan (CN)
Appl. No. 18/001,523
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and SINOPEC SOUTHWEST OIL & GAS COMPANY, Sichuan (CN)
PCT Filed Jun. 10, 2021, PCT No. PCT/CN2021/099471
§ 371(c)(1), (2) Date Dec. 12, 2022,
PCT Pub. No. WO2021/249498, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 202010534832.7 (CN), filed on Jun. 12, 2020; application No. 202010534864.7 (CN), filed on Jun. 12, 2020; and application No. 202010535615.X (CN), filed on Jun. 12, 2020.
Prior Publication US 2023/0313641 A1, Oct. 5, 2023
Int. Cl. E21B 34/14 (2006.01)
CPC E21B 34/14 (2013.01) [E21B 34/142 (2020.05)] 8 Claims
OG exemplary drawing
 
1. A sliding sleeve device, comprising:
an outer cylinder having a circulation hole disposed in a wall of the outer cylinder; and
an inner cylinder arranged in an inner cavity of the outer cylinder,
wherein the inner cylinder is movable between an initial state and a first state,
wherein in the initial state, the inner cylinder is disposed in an initial location and closes the circulation hole from the inner cavity of the outer cylinder, and in the first state, the inner cylinder is disposed in a first location and thereby exposes the circulation hole to the inner cavity of the outer cylinder,
wherein the circulation hole is filled with a lubricating grease and is covered by a protective cover disposed away from the inner cylinder, and
wherein an outer wall of the inner cylinder has a recess that is exposed to the circulation hole so as to allow the lubricating grease to enter the recess in the initial state.