Patent ID: 11933138
Assignee: SINOPEC SOUTHWEST OIL & GAS COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
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.