A kind of expansion hanger and its sitting and hanging method

Abstract

The invention relates to an expansion hanger and a sitting hanging method thereof. The expansion hanger comprises a shell assembly and an expansion ball seat assembly located in an inner cavity of the shell assembly and attached to the inner circumferential wall forming the inner cavity. The entering end of the expansion ball seat assembly is arranged to be of an inward-shrinking thin-walled cylindrical structure. The expansion hanger has the beneficial effects that when a rubber plug fails to build the pressure, a sitting hanging ball is thrown in so as to fall into the expansion ball seat assembly, and sitting hanging of the expansion hanger can still be achieved; and the sitting hanging ball in the expansion ball seat assembly guarantees that the sitting hanging ball can accurately fall into a lower pipe string after sitting hanging is finished, the phenomenon that paste is sprayed at the portion of the expansion ball seat assembly due to the blocking caused by the sitting hanging ball in the pipe string lifting and feeding processes is effectively avoided, and potential safety hazards are avoided.

Description

technical field The invention relates to the technical field of well cementing construction in oil and gas fields, in particular to an expansion hanger and a setting and hanging method thereof. Background technique The expansion hanger is an advanced liner operation tool. Compared with the traditional hanger, it has the advantages of less exposed parts, is suitable for complex well drilling, and has the functions of setting, hanging and isolation at the same time. At present, expansion hangers at home and abroad mainly include casing, packer, rubber plug, taper sleeve, slips, hydraulic cylinder and expansion body. The on-site construction technology of the expansion hanger is to first inject cement into the well, then deliver the hanging ball into the drilling tool, and wait for the ball to fall to the ball seat of the drilling tool. After this spheroid falls on the ball seat of this drilling tool, begin to suppress pressure, carry out expansion set-hanging operation. Dur...

AI Technical Summary

Problems solved by technology

During the cementing process of the above-mentioned expansion hanger, there is a problem that the rubber plug located in the expansion hanger cannot hold pressure due to various factors, so that the subsequent expansion setting and hanging cannot be performed.

Images