Double-hanging and double-sealing type high-temperature-resistant expansion hanger

Abstract

The invention discloses a double-hanging and double-sealing type high-temperature-resistant expansion hanger. The double-hanging and double-sealing type high-temperature-resistant expansion hanger comprises an expansion hanging cylinder, a slip setting and hanging mechanism, a hanging and sealing mechanism, an expansion mechanism, an inverted buckling mechanism and an adapter connector; and the slip setting and hanging mechanism comprises a central pipe, an upper expansion cone and a hydraulic mechanism, the hanging and sealing mechanism comprises a metal slip and a sealing cylinder which arefixed to the outer surface of the expansion hanging cylinder, the expansion mechanism is composed of an expansion core shaft, a lower expansion cone and a fixing short section, the expansion mechanismis prearranged in an expansion starter of the expansion hanging cylinder, and the inverted buckling mechanism is located on the lower part of the expansion mechanism and composed of a bearing core shaft, a bearing, a spring sleeve, a spring and an inverted buckling joint. Double hanging of the metal slip and the sealing cylinder and double sealing of metal and rubber can be achieved, the hangingforce of the expansion hanger is effectively improved, the sealing capacity of the expansion hanger under the high-temperature condition is remarkably improved, and the double-hanging and double-sealing type high-temperature-resistant expansion hanger is suitable for tail pipe well completion operation under high-temperature well conditions of a thermal production well, a deep well and an ultra-deep well.

Description

Technical field[0001]The invention relates to a double-suspension double-sealed high-temperature resistant expansion hanger in the field of petroleum drilling and completion tools.Background technique[0002]Liner suspension cementing technology is the most common completion method in deep wells, sidetracking and deep well cementing. It can save casing, reduce the annulus flow resistance and displacement pressure in cement injection construction, simplify the well structure, and facilitate The liner string is lowered to solve the cementing and completion problems of deep and complex wells.[0003]At present, the liner hanger can be divided into slip type liner hanger and expansion type liner hanger according to the way of mounting. Generally speaking, slip-type liner hangers have problems such as unreliable seating, small diameter of the seating, and unsatisfactory sealing effect. Expansion liner hangers generally use hydraulic methods to achieve the expansion of the hanger, making rubb...

AI Technical Summary

Problems solved by technology

The structural design has been greatly improved, but there is no mechanism for undercutting and throwing away the hand. There is a risk that the length of the suspension tailpipe is limited and the pipe string is difficult to enter. At the same time, the single suspension method is used for operation, and the hydraulic pressure is insufficient or there is no collision. Difficult to mount effectively

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