A kind of dissolvable full bore ball seat mandrel

Abstract

The invention relates to a soluble full-bore ball seat working barrel. The soluble full-bore ball seat working barrel comprises an upper connector and a lower connector. A trapezoid external thread is arranged on the outer side of the lower section of the upper connector, and a trapezoid internal thread is arranged on the inner side of the upper section of the lower connector. A sealing ring groove is formed in the lower end of the trapezoid external thread of the upper connector, and a sealing ring is arranged in the sealing ring groove. A pin through hole is formed in the upper end of the trapezoid internal thread of the lower connector, and an anti-rotation pin is arranged in the pin through hole. A straight through hole is formed in the lower end of the trapezoid internal thread of the lower connector, and the inner wall of the straight through hole serves as a sealing surface of the sealing ring. A through hole is formed in the middle section of the lower connector, and a soluble core is arranged in the through hole. The soluble full-bore ball seat working barrel solves the problems that according to an existing differential sliding sleeve type fracturing well completion tool, follow-up well repair work can not be carried out due to the small inner bore, and according to a combined bridge plug fracturing tool, the full bore of a pitshaft can not be achieved unless drilling and grinding are performed. The soluble full-bore ball seat working barrel is simple in structure, a well cementation rubber plug can pass through easily, and residual cement can be cleared away easily, so that the soluble full-bore ball seat working barrel is suitable for well cementation working conditions or non-well-cementation working conditions.

Description

technical field [0001] The invention belongs to the technical field of oilfield gas recovery, and in particular relates to a soluble full-diameter ball seat working cylinder. Background technique [0002] Differential sliding sleeve completion tools are the most widely integrated fracturing and completion tools at present. The seal between the ball seat working cylinder and the ball seat working cylinder is used for interlayer isolation. The biggest problem with this type of tool is that the diameter of the differential sliding sleeve decreases step by step from the top to the bottom, which leads to a serious reduction in the internal diameter of the pipe string after completion, making it impossible for the work string to enter the well, which brings difficulties to subsequent workover operations. [0003] In order to solve this problem, the industry has developed a composite bridge plug staged fracturing tool. After fracturing, the composite bridge plug is drilled and rem...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing differential sliding sleeve fracturing completion tool has a small internal diameter, which leads to the inability to carry out follow-up workover operations, and the problem that the composite bridge plug fracturing tool needs drilling and grinding to realize the full diameter of the wellbore

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