A fracturing hole opening and closing system

Abstract

The invention relates to a fracturing hole opening and closing system which comprises a slide sleeve. The sleeve slide comprises an inner sleeve, an outer sleeve and an isolation sleeve; the inner sleeve is provided with an inner fracturing hole; the outer sleeve is arranged on the inner sleeve in a sleeving mode and is provided with an outer fracturing hole; an annular cavity which is used for accommodating the isolation sleeve and communicates with the inner fracturing hole and the outer fracturing hole is formed between the inner sleeve and the outer sleeve; and the isolation sleeve can be driven by hydraulic pressure to slide in the annular cavity so as to enable the outer fracture hole and the inner fracturing hole to communicate with each other or disconnect from each other. The slide sleeve has the advantages that the structure is simple; the goal of no fracturing stage limitation can be realized; the whole through diameter is realized in the slide sleeve; the later period operation liquid flow back and subsequent tool entering are facilitated; the construction reliability is high; and the drilling removal operation is not needed. Under the condition of difficult drilling pressure exertion in the horizontal section, the slide sleeve is opened or closed in a hydraulic pressure mode; operation is simple and convenient; and the fracturing hole opening and closing system is particularly suitable for slide sleeve opening and closing operation of a deep well, an ultra-deep well and a horizontal well.

Description

technical field [0001] The invention relates to oil and gas well exploitation technology, in particular to a fracturing hole opening and closing system. Background technique [0002] Horizontal well multi-stage sliding sleeve staged fracturing technology is an important method for the exploitation of unconventional oil and gas resources. It has the characteristics of simple structure and high construction reliability. It is widely used in fracturing stimulation of shale gas, low permeability production layers, and thin oil layers. remodel. The existing sliding sleeve structures include ball-opening sliding sleeves, differential pressure opening sliding sleeves and mechanical switch sliding sleeves. The ball-throwing open sliding sleeve is to put a pressure-suppressing ball at the wellhead to form a seal with the ball seat in the sliding sleeve, and the pressure is suppressed to open the fracturing hole of the sliding sleeve and establish a fracturing channel; After pressur...

AI Technical Summary

Problems solved by technology

The conventional sliding sleeve switch method is mostly mechanical switch, that is, the sliding sleeve is lowered to switch the tool to switch the sliding sleeve. When the sliding sleeve is lowered to switch the horizontal section of the pipe string, it is very difficult to transmit the drilling pressure due to the low rigidity and high flexibility of the pipe string. The driving force cannot be effectively transmitted to the sliding sleeve, it is difficult to realize the switch operation of the sliding sleeve, or it is difficult to accurately judge whether the sliding sleeve is opened or closed

The current sliding sleeve switch string does not have the function of hydraulic switch sliding sleeve, so it is difficult to guarantee the reliability of the sliding sleeve switch string when operating in the horizontal well section

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