Expanding metal material and bulged tube device for petroleum oil well

Abstract

The invention relates to an expanding metal material and expansion tube device for oil well. Expanding metal material consists of :C:0.03-0.5; Si:0-6.0; Mn:0-15; Cr:0-20; Ni:0-20; N:0.02-0.08; P<=0.03; S<=0.03; mixed rare earth:0.1; Ti:0-0.8; Zr:0-1.47; surplus Fe in which carbide gross of TiC and ZrC is 0.1-1.5%. Plasticity K=sigma*delta, amount to 3800MPa%,expansion tube shape memory connector can keep good sealing state after enlarging the diameter, and internal pressure resistance of expansion tube is close to 50Mpa. Warhead piston , centralizer and hydraulic anchor fixing machine all have a simple structure, operate stably, be used easily. The invention has significance in well drilling, well completion and mending well segment, so does other duct mending.

Description

technical field [0001] The invention relates to an expansion alloy material and an expansion pipe device for oil wells, especially a material with excellent strong plasticity and an expansion process device for oil well workover. Background technique [0002] Solid Expandable Tubulars SET (Solid Expandable Tubulars) is an emerging technology in oil drilling, well completion and workover engineering. The method is characterized by running the casing into the predetermined position in the well, delivering mud fluid through the middle pipe, and filling the outside of the casing. Then the expansion cone at the lower part is pushed by the liquid pressure, expands and expands the casing from bottom to top; makes the pipe diameter 10-30% plastic change; the expansion pipe technology optimizes the wellbore structure, and the casing of the original technology is made of Composed of casings of various sizes, it has a large upper and lower small tapered well body structure. For example...

AI Technical Summary

Problems solved by technology

However, there are currently three problems: first, the expansion pipe is made of low-alloy high-strength steel, which has more than enough plasticity for expansion and diameter expansion, and insufficient strength to cope with external pressure; second, special threaded connections are used between casings in the downhole, which is difficult to process and cumbersome to construct and assemble; The third is that the running tools are too complicated. For the 51 / 2” wellhead, there are more than 2,000 tool parts for running. At the same time, the device encounters complex formations, and the expansion operation is not stable.

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