The tool and its construction method for sending sand control pipe strings into and out of horizontal wells with gravel

Abstract

The invention relates to the field of well completion sand prevention of gravel filling of horizontal wells and discloses a feeding grip releasing tool for gravel filling of a sand control pipe column of the horizontal well. An in-pipe suppressing grip releasing mode or an out-pipe suppressing grip releasing mode can be adopted, and the feeding grip releasing tool is composed of three parts including a seat seal conversion mechanism, a positively-rotary feeding mechanism and a hydraulic stage-by-stage grip releasing mechanism; the upper end of the seat seal conversion mechanism is in threaded connection with a piston of a seat seal tool body, and the lower end face of the seat seal conversion mechanism directly make contact with a packer external pushing cylinder needing to be fed; and the positively-rotary feeding mechanism and the hydraulic grip releasing mechanism are sequentially arranged in the seat seal conversion mechanism from top to bottom, the upper end of the positively-rotary feeding mechanism is in threaded connection with a core shaft of the seat seal tool body, and the lower end of the hydraulic grip releasing mechanism is in threaded connection with other service tool bodies. According to the feeding grip releasing tool for gravel filling of the sand control pipe column of the horizontal well, in the process that the sand control pipe column is put into the well, positively-rotary in-putting can be achieved, blocked possibility of the pipe column is reduced, the grip releasing mode has two types including the hydraulic type and the mechanical type, hydraulic grip releasing is low in pressure, the shear value is stable and reliable, the torque value of the pipe column is low in the mechanical grip releasing process, and the operation security coefficient is high.

Description

technical field [0001] The invention belongs to the technical field of sand control technology for horizontal well gravel packing and well completion in oil field development and production, and in particular relates to a service tool for horizontal well gravel packing sand control strings and a construction method thereof. Background technique [0002] In the current well-known oilfield development, with the increase of drilling and production of deep wells and complex wells, especially the continuous innovation and progress of completion technology, higher requirements are put forward for the functions and use of well completion tools. The feeding and releasing tool used for gravel packing sand control strings in horizontal wells is a necessary service tool for sand control tools to complete different operations in open hole gravel packing sand control operations in horizontal wells. At present, there are many kinds of feeding and releasing tools on the market, but the sur...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing feeding and releasing tools cannot meet the needs of forward rotation feeding and optional pressure inside or outside the pipe, and hydraulic release construction is easily affected by well conditions, resulting in excessive deviation of release pressure. Large technical risk, provides a horizontal well gravel-packed sand control pipe string into the release tool and its construction method, simple structure, easy construction operation and safe and reliable

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