Identical-ball equal-diameter fracturing sliding sleeve, single-ball fracturing sliding sleeve and identical-ball equal-diameter fracturing pipe string

Abstract

The invention provides an identical-ball equal-diameter fracturing sliding sleeve, a single-ball fracturing sliding sleeve and an identical-ball equal-diameter fracturing pipe string. The identical-ball equal-diameter fracturing sliding sleeve is characterized in that the lower end of an upper connector is connected with an outer barrel, an internal and external connection channel is formed in the upper end of the outer barrel, an inner sliding sleeve is connected into the outer barrel in a sleeved mode, a counting rod is sleeved with the inner sliding sleeve, a plurality of clamping bosses are arranged on the inner side of the upper end of the counting rod in the axial direction, a sliding barrel is sleeved with the counting rod, the upper end of the sliding barrel can be clamped on the clamping bosses, the sliding barrel has the first position and the second position, fracturing balls can be located at the first position, the fracturing balls can be released at the second position, and the second position is located below the first position; the identical-ball equal-diameter fracturing pipe string is sequentially connected with a plurality of fracturing sliding sleeves in series from bottom to top. According to the identical-ball equal-diameter fracturing sliding sleeve and the identical-ball equal-diameter fracturing pipe string, the number of the clamping bosses of the sliding sleeves of various levels is designed according to the fracturing levels, the inner drift diameters of the sliding sleeves of various levels are equal, the fracturing balls of the identical size are put into the sliding sleeves, the sliding sleeves of various levels are opened in sequence, fracturing is carried out on corresponding oil layers, multi-layer stepless fracturing is achieved, and the number of layering modification levels of the oil layers is greatly increased.

Description

technical field [0001] The invention relates to a ball-throwing sliding sleeve, in particular to an equal-spherical and same-diameter fracturing sliding sleeve, a single-ball fracturing sliding sleeve and an equal-spherical and same-diameter fracturing string for downhole fracturing of an open-hole horizontal well in an oil field. Background technique [0002] At present, open hole horizontal wells in oilfields mainly use "open hole packer + step-by-step ball sliding sleeve" fracturing string for well completion and fracturing. The fracturing string uses multi-stage ball Each level of sliding sleeve corresponds to an oil layer in the downhole, and the inner diameter of each level of ball-throwing sliding sleeve increases from small to large, and the opening and fracturing of each layer of sliding sleeve are completed by dropping steel balls / composite balls of different diameters from the wellhead . [0003] But this type of multi-stage pitching sleeve has the following disa...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an equal-spherical and same-diameter fracturing sleeve, a single-spherical and same-diameter fracturing sleeve, and an equal-spherical and same-diameter fracturing string, so as to solve the limitation of the existing technology that the size of the sliding sleeve increases step by step And the defect that it is impossible to carry out multi-level reformation on the oil layer

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