Staged fracturing well completion method using hydraulic-controlled switch to open/close controllable valves
A technology of staged fracturing and hydraulic control switch, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., and can solve the problems of limited number of stages and fracturing scale, unusable, complex string structure, etc. , to achieve the effects of saving perforation costs and operating time, increasing productivity and recovery, and increasing fracture length
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[0019] The present invention will be further described below in conjunction with accompanying drawing:
[0020] see figure 1 : The switchable control valve for staged fracturing completion includes an outer sleeve 4-3 and an inner sliding sleeve 4-7, the outer sleeve 4-3 is provided with a liquid flow channel 4-6, and the inner sliding sleeve 4-7 is installed Inside the outer sleeve 4-3, both ends of the outer sleeve 4-3 are connected with an upper joint 4-1 and a lower joint 4-9. The inner circle of the top cylinder of the inner sliding sleeve 4-7 is provided with a hook shoulder 4-4 for opening, the upper cylinder is provided with positioning ribs, and the inner circle of the lower cylinder is provided with a hook shoulder 4-8 for closing; The outside of the positioning rib is provided with a positioning boss 4-10. The inner circle of the cylinder above the liquid flow channel 4-6 of the outer sleeve 4-3 is provided with a positioning groove 4-2 for opening and a position...
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