FIELD: oil, gas and coke-chemical industry.
SUBSTANCE: sliding sleeve for completion of oil and gas wells contains an external cylinder with a circulation hole made in the wall of the external cylinder. Inner cylinder is located in the inner cavity of the outer cylinder. In the initial state, the inner cylinder and the outer cylinder are fixed to each other to close the circulation hole. In the first state, the inner cylinder is movable relative to the outer cylinder in order to unlock the closure of the circulation hole. Protective mechanism is provided in the circulation hole, having an inner element located on the radially inner side. Outer element is located on the radially outer side. Internal element is a grease filled in the circulation hole. External element is a safety casing.
EFFECT: increased smoothness and easier opening of the circulation hole.
9 cl, 9 dwg
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