Hydraulic expansion-type rotary liner hanger

Abstract

The invention relates to a hydraulic expansion-type rotary liner hanger which mainly comprises a central pipe, a rubber ring, an expansion cone, a hanger body, a spline shaft, a dual-male connector, a hollow rubber plug, a cementing rubber plug, a rubber plug shearing seat and a rubber plug conduit. The hanger body is a variable-diameter expansion pipe, the rubber ring is added at the upper end of the expansion pipe, the lower end of the expansion pipe is connected with the dual-male connector, a spline groove in the dual-male connector is coupled with a spline on the spline shaft, the upper end of which is connected with the central pipe, a burst disc is mounted on the spline shaft, the expansion cone is sleeved on the spline shaft, the rubber plug conduit is connected with the lower end of the dual-male connector, the lower end of the rubber plug conduit is connected with a liner, the hollow rubber plug and the shearing seat are arranged in the rubber plug conduit, the shearing seat is mounted on a shoulder in the rubber plug conduit, and the hollow rubber plug is connected with the rubber plug shearing seat through pins and threads. The invention has the advantages that the well-cementing quality and the well-cementing success rate of the liner are improved by rotating a whole tubular column in cementing a well, the problems of annulus sealing in the stacking section of the liner is solved, reverse snapping is avoided after hanging, and the internal through diameter is greater.

Description

technical field [0001] The invention relates to a hydraulically expandable rotatable liner hanger, which is used for hanging the liner when the liner is completed well, and relates to the technical field of petroleum cementing and well completion. Background technique [0002] The liner completion technology refers to the process of suspending the liner on the upper casing to complete the well by using the liner hanger. The liner hanger is a necessary tool for the liner completion. With the development of drilling technology, drilling technologies such as deep wells, ultra-deep wells, highly deviated wells, horizontal wells, branch wells, and small hole and small gap wells are constantly emerging, as well as the rapid development of old well sidetracking technology, liner completion technology The application of the hanger is more and more extensive, and it is difficult to use the existing conventional hanger to meet the production needs for the liner completion operation of...

AI Technical Summary

Problems solved by technology

With the development of drilling technology, drilling technologies such as deep wells, ultra-deep wells, highly deviated wells, horizontal wells, branch wells, and small hole and small gap wells are constantly emerging, as well as the rapid development of old well sidetracking technology, liner completion technology It is more and more widely used, and it is difficult to use the existing conventional hanger to meet the production needs in the liner completion operation of these special wells, and sometimes even cause major downhole accidents

[0003] At present, the liner hanger can be divided into slip type and expansion type liner hanger according to its setting method. The danger of not opening the buckle; while the expansion hanger cannot rotate during cementing, there is a replacement dead zone, and the cementing quality cannot be guaranteed

[0004] Patent Publication No. CN200946473Y provides an expandable liner hanger, which expands in a hydraulic up-down expansion mode, has a complex structure and cannot rotate the liner; Patent Publication Nos. CN101173601A and CN101187300A disclose two types of hydraulic and mechanical hydraulic double-acting The expansion rotary hanger in the expansion mode is inconvenient to assemble the feeding joint connecting the expansion hanger, and the hanger body is processed with a spline groove, which will have a certain impact on the later work; at the same time, it is used for the choke ring for the secondary bumping It is located in the lower connecting pipe so that the cement slurry in the liner below the lower connecting pipe cannot be replaced, and it is necessary to drill down to drill the plug

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