Slide-block-type diameter changing expansion tool used for expansion pipes

Abstract

The invention relates to a slide-block-type diameter changing expansion tool used for expansion pipes. The tool mainly comprises three parts of an upper tip cone, an expansion slide block and a lower bottom cone; the upper tip cone and the lower bottom cone are through hole cone structures; the expansion slide block is positioned between the upper tip cone and the lower bottom cone and is cooperatively connected with inclined plane ribs of the upper tip cone and the lower bottom cone through rib grooves; During expansion, the upper tip cone and the lower bottom cone move in opposite directions to push the expansion slide block to move radially so that diameter changing can be realized by the diameter changing expansion tool; an upper part of the upper tip cone and a connecting tube are provided with a locking mechanism for spacing locking the closed diameter expansion tool. Diameter changing is realized through the expansion slide block; the closing force of the tool is reduced; the locking mechanism is used for spacing the tool after closing so as to guarantee the uniform fixed diameter expansion of the expansion tube; at the same time, a first expansion cone and a second expansion cone are adopted to realize twin-stage isometric expansion, reduce expansion force of tubes, which is good for safe operation on site.

Description

technical field [0001] The invention relates to the technical field of drilling and completion tools in the petroleum and natural gas industry, in particular to a slider-type variable-diameter expansion tool for expansion pipes. By adopting the variable diameter of the expansion tool, the expansion pipe can achieve variable-diameter expansion and equal-well-diameter expansion. . Background technique [0002] In traditional oil and gas field drilling operations, with the increase of the casing layer in the well, the size of the casing decreases step by step, and the size of the wellbore also shrinks, which often leads to the inability to successfully drill the target formation or The size of the wellbore is too small to affect the later production operations. Expandable casing technology, as a follow-up solution to drilling problems, has been applied in wellbore structure design and drilling plan. Its expansion rate is relatively small, and it is impossible to use convention...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems faced by the existing variable-diameter expansion tools for expansion tubes, and solving the problems of excessive closing force and easy disengagement of the variable-diameter expansion tools, a slider-type variable-diameter expansion tool for expansion tubes is invented. Expansion tube realizes equal diameter expansion

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