Ball-throwing type fracturing slide bushing and fracturing pipe column
A fracturing sliding sleeve and ball-throwing technology, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problems of limited number of fracturing stages and construction scale, and achieve short and reliable construction period sex high effect
Active Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, in the staged fracturing technology of the ball-sliding sleeve, the ball seat and the pressure-suppressing ball are designed from the bottom of the well to the wellhead. Open the primary sliding sleeve and perform primary fracturing
Therefore, the number of staged fracturing stages and the construction scale will be greatly limited due to the limitation of the diameter of the ball seat
Method used
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[0028] The present invention will be further described below in conjunction with accompanying drawing.
[0029] figure 1 It is a structural schematic diagram of a ball-pitching fracturing sliding sleeve 100 (hereinafter simply referred to as sliding sleeve 100 ) according to the first embodiment of the present invention. Such as figure 1 As shown, the sliding sleeve 100 includes an outer tube 7 on which a first fracturing hole 21 is arranged. A plurality of inner grooves 15 are formed on the inner wall of the outer tube 7 upstream of the first fracturing hole 21, and these inner grooves 15 are distributed at intervals in the axial direction, that is to say, there are intervals between adjacent inner grooves 15 14. Compared with the spacer 14, the inner groove 15 is recessed.
[0030] An inner casing 8 is also arranged inside the outer pipe 7, and a second fracturing hole 16 is arranged on the inner casing 8. In the initial state, the inner casing 8 and the outer pipe 7 ar...
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The invention relates to a ball-throwing type fracturing slide bushing and a fracturing pipe column. The ball-throwing type fracturing slide bushing comprises an outer pipe and an inner bushing; a first fracturing hole is formed in the outer pipe, and a second fracturing hole is formed in the inner bushing; multiple inner grooves distributed at intervals in the axial direction are constructed on the portions, in the upstream area of the first fracturing hole, of the inner wall of the outer pipe, and a joint hollow level-variable body is formed by the inner wall of the outer pipe and any one of the inner grooves. A ball seat groove is constructed on the portion, located in the downstream area of the inner bushing, of the inner wall of the outer pipe, and an elastic ball seat is arranged in the ball seat groove. According to the ball-throwing type fracturing slide bushing, multiple stages of slide bushings can be opened by tripping balls with the same specification, and therefore the fracturing level is not limited by the size of the tripping balls and the ball seat.
Description
technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a ball-pitching fracturing sliding sleeve. The present invention also relates to a fracturing string formed by connecting a plurality of such fracturing sliding sleeves in series. Background technique [0002] With the deepening of exploration and development of oil and gas fields, a large number of low-permeability and ultra-low-permeability tight oil and gas fields have been discovered and developed. In the development of such oil and gas fields, staged fracturing is a very important process, and for extensive exploitation, the number of fracturing stages shows a trend of substantial increase. [0003] The usual staged fracturing method is the ball-type sliding sleeve staged fracturing method, which is realized through tools such as a ball-type sliding sleeve fracturing device, an open hole packer, and a pressure holding ball, among which the ball-type slid...
Claims
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Login to View More IPC IPC(8): E21B34/14E21B43/26
Inventor 朱玉杰马兰荣孔博朱和明魏辽韩峰
Owner CHINA PETROLEUM & CHEM CORP