A stepless and repeatedly switchable fracturing sliding sleeve for horizontal wells

Abstract

A horizontal well stepless and repeatedly openable fracturing sliding sleeve is used to solve the problems that the traditional sliding sleeve is limited by the number of fracturing layers, the number of opening and closing times, and the diameter of the pipe string. It is characterized in that it includes three units: the first unit is the frame support mechanism of the sliding sleeve, that is, the casing and main supporting parts of the sliding sleeve; the second unit is the power actuator of the sliding sleeve, and the accumulator is the only energy source. Use it to drive the hydraulic cylinder to open or close the sliding sleeve; the third unit is the control mechanism of the sliding sleeve, that is, the three-position four-way electromagnetic reversing valve and the radio frequency module control the reception of signals, and then control the entire sliding sleeve system. This kind of horizontal well stepless and repeatedly switchable fracturing sliding sleeve has the advantage of realizing multi-layer fracturing, so that it is no longer limited by the number of fracturing layers. During the fracturing process, the sliding sleeve can be opened and closed repeatedly. It achieves the effect of multiple fracturing in one layer, and at the same time realizes the full passability of the pipe string, maximizes the fracturing degree, and solves the defects of the traditional fracturing sleeve.

Description

technical field [0001] The invention relates to a fracturing sliding sleeve capable of working under horizontal oil wells. Background technique [0002] The exploration and development of oil and gas resources in my country presents the current situation that new oilfield reservoir types are becoming more and more complex, and old oilfields are becoming more and more difficult to tap potential. How to improve the development efficiency of oilfields and maximize the recovery of oilfields has become the common pursuit of the oil industry. The goal. The fracturing technology began in the 1980s and 1990s, initially as a general fracturing reconstruction of oil and gas wells. After 2000, with the field application and large-scale development of unconventional oil and gas resources such as shale gas, tight gas, and tight oil, many developed countries began to try research on fracturing technology. Therefore, it is particularly important to develop a high-efficiency, simple proces...

AI Technical Summary

Problems solved by technology

Among the several types of sliding sleeves in the prior art, due to the size limitation of the fracturing ball and ball seat, the ball-throwing sliding sleeve cannot realize infinite fracturing; the dart-type sliding sleeve is expensive to manufacture due to its complex structure, and there are often seals. If it is not strict, the switch-type sliding sleeve requires a large driving force when performing fracturing work, coupled with factors such as body scaling, rust, friction of the sealing ring, and the limit mechanism, the driving force will be reduced. become larger, which can easily lead to the breakage of the pipe string

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