Sand-prevention and water-controlling sliding sleeve and opening-and-closing device thereof

Abstract

The invention provides a sand-prevention and water-controlling sliding sleeve and further provides a switching device of the sand-prevention and water-controlling sliding sleeve. The sand-prevention and water-controlling sliding sleeve comprises an outer casing pipe, a lead screw and a sealing inner sleeve body. A circulation hole is formed in the outer casing pipe, and an internal thread is arranged on the inner wall of the first end of the outer casing pipe; the lead screw is located in the outer casing pipe, and a first external thread engaged with the first internal thread is arranged on the outer wall of the lead screw, so that the lead screw vertically moves in the axial direction of the outer casing pipe; and the outer wall of the lead screw is sleeved with the sealing inner sleeve body, and the sealing inner sleeve body vertically moves along with the lead screw in the axial direction of the outer casing pipe to open or close the circulation hole in the outer casing pipe. The switching device comprises a fixing piece and a rotary piece, wherein the fixing piece is used for fixing the outer casing pipe or a second connector of the sand-prevention and water-controlling sliding sleeve, and the rotary piece is used for fixing the lead screw and driving the lead screw to rotate. According to the sand-prevention and water-controlling sliding sleeve and the opening-and-closing device thereof, the structure is simple, and unlimited times of opening and closing can be achieved through rotating of the lead screw, so that shale oil and gas and compact sandstone oil and gas horizontal well infinite stage sectional well completion, early stage fracturing and later stage water controlling are achieved, and the oil and gas well recovery efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of well completion and production of oil and gas wells, in particular to a sand control water control sliding sleeve and a switch device thereof, which are used for stage completion, stage fracturing and water control production of horizontal wells. Background technique [0002] With the exploration and development of unconventional oil and gas resources such as shale gas and shale oil, the staged fracturing technology of horizontal wells has been effectively implemented. Reservoir fracturing technology is to divide horizontal wells such as shale oil and gas and tight rock formations into multiple sections, and then fracture the formation into multiple fractures to expand the oil drainage area of ​​oil and gas production layers, improve oil and gas recovery, and thus increase single well production . Horizontal well open-hole staged fracturing technology is a kind of reservoir fracturing and widely used in ...

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Problems solved by technology

[0004] The multi-stage ball-pitching sliding sleeve has the following problems: 1) Due to the restriction of a certain level difference between the fracturing ball and the ball seat, it is impossible to realize infinite staged fracturing; 2) The sliding sleeve can only be opened by hydraulic pressure, and cannot be closed, and the oil and gas wells will produce water. 3) The fracturing ball is affected by the medium in the wellbore, and cannot effectively seal the ball seat, and sometimes cannot be effectively opened; 4) The ball seat of the sliding sleeve makes the diameter of the completion string smaller, making it difficult to operate later

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