Fracturing switch type cementing sliding sleeve mechanical opening tool and method

Abstract

The application discloses a fracturing switch type well cementing sliding sleeve mechanical opening tool and method, which can improve the sliding sleeve opening efficiency, realizes continuous variable sequence fracturing operation, saves fracturing fluid, saves pumping time, and reduces fracturing construction cost. The upper sleeve and the lower sleeve are specially designed in an open type for fracturing flowback sand and sand setting, a plurality of round holes and notches are formed on the surface of the sleeve, and the sleeve plays a role in preventing sand sticking. The lower end outer surface of the mechanical switch elastic claw is in linear contact with the upper end inner surface of the lower sleeve, a plurality of notches are formed on the surface in a circumferential direction, wear-resistant steps are arranged in a radial direction, mechanical switch teeth are arranged on the wear-resistant steps, and the mechanical switch teeth are matched with the sliding sleeve to be lifted; the opening tool can be directly lifted step by step through the coiled tubing or the ordinary oil pipe, or can be lifted through the hydraulic system, and any stage fracturing well cementing sliding sleeve is opened through the cooperation between the lower sleeve, the mechanical switch elastic claw and the reset spring, so that the variable sequence fracturing operation is realized.

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