Umbrella type variable gauge inflate tool for expansion tube

Abstract

The invention relates to an umbrella type variable gauge inflate tool for an expansion tube, which comprises a fixing cone and a variable gauge cone. The fixing cone has a conical through-hole structure with narrow upper side and wide bottom. The variable gauge cone comprises a base plate, a variable gauge conical sheet and an expansion tip cone. The variable gauge conical sheet comprises a first conical side, a second conical side and an expansion conical side; the expansion tip cone has a conical structure with narrow upper side and wide bottom; the top end is placed in the through hole of the expansion conical sheet; and a conical angle of the expansion cone side is equal to the conical angle of the expansion tip cone. The inflate tool has a plurality of expansion conical sheets combined on the base plate. When expanding, under the action of hydraulic power, the expansion conical sheets expand on radial direction along the tip conical side of the expansion tip cone so as to vary the gauge of the inflate tool. When the expansion conical side becomes an upright side, the outer diameter of the inflate tool reaches to the maximum value. The invention has the advantages that the variable cone of the inflate tool can realize variable gauge expansion under the action of an external force, the expansion volume of the tube is greatly increased, the well diameter utilizing ratio is increased, the structure is simple, the processing is convenient, the expansion force is small, and the tool is suitable for being used in various sleeves and barefoot wells with regular well walls.

Description

technical field [0001] The invention is an umbrella-type variable-diameter expansion tool for an expansion pipe, which is suitable for the field of oil drilling and well completion, and enables the expansion pipe to realize variable-diameter expansion or equal-well-diameter expansion. Background technique [0002] With the continuous advancement of drilling technology and the development of more and more deep well reservoirs, the traditional wellbore has always had the practical problem of long drilling period and small wellbore in the production section after drilling. Not only the drilling cost is high, but And it is not conducive to production and later operations; if the formation is unstable, the wellbore collapses and shrinks, such as salt-gypsum layers and some loose sandstone oil layers, it is difficult to continue drilling. [0003] The pipe body of the expandable pipe can undergo permanent plastic deformation in the radial direction, so as to significantly reduce t...

AI Technical Summary

Problems solved by technology

[0004] In order to solve complex drilling problems with large-size expandable tubes in open holes and realize equal-diameter expandable tube drilling technology, the expansion tool is required to have variable diameter characteristics, so that the expandable tube can obtain greater expansion.

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