SLIDING SLEEVE WITH PRESSURE DROP AND METHOD OF CONSTRUCTION WITH HYDRAULIC FRACTURING OF OIL AND GAS WELLS USING THEREOF Russian patent published in 2025 - IPC E21B34/08 E21B43/26 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: group of inventions relates to completion of oil and gas wells. Sliding clutch with pressure drop comprises an external cylinder with a flow directing hole provided in the wall of the external cylinder. Flow directing hole is filled with filler, the protective element is located radially outside the filler. At least one guide hole is located on the protective element. Size of the guide hole is smaller than the size of the flow guide hole. Inner cylinder is located in the inner cavity of the outer cylinder. In the initial state, the inner cylinder and the outer cylinder are attached to each other to close the flow directing hole. Upper butt joint passes into the inner cavity of the external cylinder and is rigidly connected to the upper end of the external cylinder. Gap is formed between the lower end surface of the upper butt joint and the axial upper end surface of the inner cylinder. Lower butt joint passes into the inner cavity of the external cylinder and is rigidly connected to the lower end of the external cylinder. Support ring is located in the inner cavity of the outer cylinder and between the lower butt joint and the inner cylinder. Support ring dissolves under action of working fluid. Area of the axial upper end surface of the inner cylinder is larger than the area of its axial lower end surface so that the working fluid creates a pressure difference between the axial upper and lower end surfaces of the internal cylinder to provide downward pressure for the inner cylinder, which moves downward under pressure after dissolution of the support ring to open the flow directing hole. Disclosed is a method for construction with hydraulic fracturing of oil and gas wells using a sliding sleeve with pressure drop.

EFFECT: providing stable and reliable opening of the sliding coupling with pressure drop, as well as reducing the risk during construction.

13 cl, 4 dwg