Steel pipe hydraulic expansion type external packer

Abstract

The invention relates to a steel pipe hydraulic expansion type external casing packer, comprising a base pipe, an upper fixing member, a lower fixing member and sealing rubber, wherein two ends of the base pipe are respectively provided with a connector. A liquid inlet hole is machined in the base pipe; a pressure-limiting rupture disk is arranged in the liquid inlet hole; a sliding sleeve is connected in the base pipe in the position of the liquid inlet hole through a primary pin bolt; the sliding sleeve is provided with a through hole which is communicated with the liquid inlet hole; an expansion pipe is arranged at the outer side of the base pipe; the upper end of the expansion pipe is fixedly connected with a sliding nipple; the sliding nipple is fixedly connected with an upper connecting member through a secondary pin bolt; the sliding nipple is hermetically inserted in the upper fixing member through the upper connecting member; the upper fixing member is fixedly connected with the base pipe; the lower end of the expansion pipe is fixed at the outer side of the base pipe through a lower connecting member and the lower fixing member; more than one section of sealing rubber is arranged at the outer side of the expansion pipe; the base pipe is further internally provided with a pressing tool. As a hydraulic expansion steel pipe and the sealing rubber are employed, the steel pipe hydraulic expansion type external casing packer has the advantages of large packing outer diameter, high strength and capability of packing a well hole adaptably, and can be widely applied to well completion fields, such as sectional well completion and interlayer packing.

Description

technical field [0001] The invention relates to an external isolation tool used for stage completion and interlayer isolation in the technical field of special tools for drilling and completion. Background technique [0002] The outer pipe packer is an important tool in the process of petroleum cementing and selective well completion. It is connected with the casing and is a downhole tool used to seal the annular space between the casing and the well wall. Implement layer separation, it can carry out operation and production control according to layer, so as to effectively realize the segmented production of oil and gas wells and the interlayer isolation of complex formations. [0003] The existing outer casing packer mainly realizes outer casing sealing by two methods of rubber sleeve expansion sealing and self-expansion when encountering oil and water. The expansion sealing method of the rubber sleeve, through the action of the high-pressure fluid entering the expansion c...

AI Technical Summary

Problems solved by technology

Hydraulic expandable external packers usually use drilling fluid as the expansion medium, such as patent CN102650202A, in complex downhole environments such as high temperature and high pressure, casing eccentricity, hydraulic expandable external packers are prone to failure

The cement slurry expandable external packer uses ultra-retarded cement slurry as the expansion medium, such as the patent CN101255784, but its construction technology is relatively complicated. If the construction is not done properly, the cement slurry may pass through the screen to pollute the formation, or the inner pipe tool is not used. Prompted in time to be fixed in the well by cement slurry, causing serious construction accidents

The oil / water self-expanding tubular outer packer adopts oil / water self-expanding rubber, which expands to seal the formation after the oil / water contact of the late stage, such as CN102337855A, but it is under high temperature and high pressure conditions The isolation effect is limited, and the isolation strength is also limited after the rubber self-expands, making it difficult to isolate complex formations

[0004] Conventional outer casing packers have been widely used in the field of petroleum well completions to perform staged screen completion and interlayer isolation, protect and reduce oil layer pollution, and delay horizontal bottom water coning to a certain extent; but There are still problems such as limited sealing effect, easy damage of sealing rubber, and short sealing time.

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