Multi-stage fracturing sliding sleeve device and using method thereof
A technology of fracturing sliding sleeves and fracturing strings, which is applied in the direction of wellbore/well valve devices, earthwork drilling and production, and production fluids, and can solve the problems of limited number of fracturing sliding sleeves
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[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0016] Such as figure 1 As shown, the present invention mainly includes an upper pipe string joint 1 , a sleeve body 2 , a lower pipe string joint 3 , a switch sleeve 4 and a reducing ball seat 5 .
[0017] In the present invention, the lower part of the upper pipe string joint 1 is threaded to the upper part of the casing body 2, and the lower part of the casing body 2 is threaded to the upper part of the lower pipe string joint 3. The upper and lower parts of the casing 2 are provided with internal threads, and the lower part of the upper pipe string joint 1 and the upper part of the lower pipe string joint 3 are provided with external threads. The sleeve body 2 is cylindrical, and a number of side holes 21 are provided at intervals in the circumferential direction near the upper position; a circle of steps 22 is provided on the inner side of the s...
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