Expanding metal material and bulged tube device for petroleum oil well

Abstract

The invention relates to an expansion alloy material and an expansion pipe device for petroleum oil wells. The composition of the expansion alloy material is: 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; the balance is Fe. The total amount of TiC and ZrC carbides in the alloy is 0.1-1.5%. Its strong plasticity K=σ・δ can reach 3800MPa%; the shape memory connection of the expansion tube can still maintain a good sealing state after the diameter is expanded, and the internal pressure resistance of the expansion tube is close to 50MPa; the bullet piston, centralizer and hydraulic anchor fixing mechanism in the process device etc., simple in structure, stable in operation and easy to use. This invention is of great significance for oil drilling, well completion and repair of long well sections, and also has important popularization value for other pipeline repairs.

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 tool is too complicated. For a 5 1 / 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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