Variable-diameter fracturing valve

Abstract

The invention relates to a variable-diameter fracturing valve, which is applied to modification construction of oil gas field fracturing. An upper pressure transmitting joint is fixed on the top of an upper pressure transmitting channel; an upper joint is provided with an axial fracturing channel, and an outer sliding sleeve and an inner sliding sleeve are arranged in the upper joint; the lower end of the upper joint is connected with a cylinder sleeve; an upper connecting cylinder is sleeved in the cylinder sleeve; a guide sleeve is sleeved in the upper connecting cylinder; the upper connecting cylinder is connected with the guide sleeve through a shearing pin; a supporting seat is in threaded connection with the upper connecting cylinder; the supporting seat is arranged in the upper connecting cylinder; a variable-diameter ball seat is arranged in the supporting seat; the cylinder sleeve is in threaded connection with a lower pressure transmitting body; the upper end of the lower pressure transmitting body is connected with a lower connecting cylinder; the lower pressure transmitting body is provided with a lower pressure transmitting channel, and the lower end of the lower pressure transmitting channel is provided with a lower pressure transmitting joint; and the lower end of the lower pressure transmitting body is connected with a lower joint. The variable-diameter fracturing valve has the effects that: the variable-diameter ball seat is drawn down sequentially to form a ball seat in the fracturing process; sealing balls with the same diameter are input repeatedly, and the fracturing valve is opened to sequentially complete fracturing repeatedly; and the variable-diameter fracturing valve is not limited by a borehole diameter and realizes unlimited section fracturing construction of laying down a row of pipe columns.

Description

technical field [0001] The invention relates to the technical field of oil and gas field fracturing reconstruction construction, in particular to a fracturing valve, which is a variable diameter fracturing valve suitable for multi-stage fracturing reconstruction of oil and gas fields. Background technique [0002] At present, the multi-layer fracturing reconstruction of cased wells in domestic oilfields mainly adopts cable perforation, mechanical packer layer fracturing and hydraulic sandblasting perforation layer fracturing technologies, all of which use sealing balls of different sizes from small to large. Complete the opening of the sliding sleeve (injector) of each layer and the isolation of the reformed layer, but due to the limitations of the wellhead, wellbore, construction string, tool design size, etc., even through continuous optimization and improvement of the process and tools, it can only Complete layered fracturing with a limited number of layers. [0003] Wit...

AI Technical Summary

Problems solved by technology

The defect of this technology is also that the size of the sliding sleeve is limited by the step-by-step increase in the size of the steel ball, so it cannot realize infinite series of layered transformations and cannot meet the current development needs of oil and gas fields.

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