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Steel for high-expansion-rate petroleum casing and method for manufacturing petroleum casing

A technology of oil casing and high expansion rate, which is applied in the direction of casing, drill pipe, earthwork drilling and production, etc. It can solve the problems of low actual expansion rate and high production cost, and achieve the effects of low cost, reduced production cost and simple operation

Inactive Publication Date: 2012-06-27
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide steel for high expansion rate oil casing and its method for making oil casing. The expansion rate of the oil casing made of this steel is ≥ 30%. After deformation and strengthening, the yield strength of the pipe reaches 550-1000MPa, the tensile strength reaches 800-1300MPa and the elongation rate is ≥10%, which overcomes the problems of low actual expansion rate and high production cost of the existing expandable casing for oil and gas wells. shortcoming

Method used

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  • Steel for high-expansion-rate petroleum casing and method for manufacturing petroleum casing
  • Steel for high-expansion-rate petroleum casing and method for manufacturing petroleum casing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] High-expansion oil casing steel, the element composition raw materials are: 0.07%C, 2.0%Si, 1.2%Mn, ≤0.02%S, ≤0.02%P and the balance is Fe, and the raw materials are smelted and made steel plate.

[0023] The above-mentioned high-expansion petroleum casing steel that has been smelted and made into a steel plate is made into a seamed steel pipe by using the straight seam resistance welding manufacturing technology, and then heat-treated. The heat treatment method is to use a medium-frequency induction heater to heat to 900°C, and then use water cooling or forced air to quickly cool the seamed steel pipe to room temperature, and obtain a high-expansion seamed oil with a multiphase structure of F+M or B+a small amount of residual A. The outer diameter is 110mm and the wall thickness is 6mm. Casing, the yield strength of the obtained high-expansion slotted petroleum casing pipe reaches 380MPa, the tensile strength reaches 690MPa, and the elongation rate is 32%; The outer d...

Embodiment 2

[0025] High expansion rate oil casing steel, its elemental composition raw materials are calculated by mass percentage: 0.15%C, 1.5%Si, 1.5%Mn, 0.5%Cr, 0.05%Nb, ≤0.02%S, ≤0.02%P and the balance It is Fe, which is smelted and made into steel billets.

[0026] The above-mentioned high-expansion petroleum casing steel that has been smelted and made into steel pipe blanks is made into seamless steel pipes by using seamless pipe forming technology. Cool to room temperature to obtain a high expansion rate seamless oil casing with an outer diameter of 110 mm and a wall thickness of 6 mm with F+M or B+ a small amount of residual A multiphase structure, and the yield strength of the obtained high expansion rate seamless oil casing pipe The tensile strength reaches 400MPa, the tensile strength reaches 700MPa, and the elongation rate is 30%. The high expansion rate seamless oil casing pipe is reamed and deformed. After reaming, the outer diameter of the expanded pipe is 154mm, and the ex...

Embodiment 3

[0028] High expansion rate oil casing steel, its elemental composition raw materials are calculated by mass percentage: 0.2%C, 2.5%Si, 3.5%Mn, 0.02%Ti, 0.25%Cr, ≤0.02%S, ≤0.02%P and the balance It is Fe, which is smelted and made into steel billets.

[0029] The above-mentioned high-expansion oil casing steel that has been smelted and made into steel pipe blanks is made into seamless steel pipes by seamless pipe forming technology. The temperature of the seamless steel pipes is controlled at 800 °C, and then forced air cooling is used to make the temperature of the steel pipes rapidly Cool to room temperature to obtain a high expansion rate seamless oil casing with an outer diameter of 219 mm and a wall thickness of 9 mm with F+M or B+ a small amount of residual A multiphase structure, and the yield strength of the obtained high expansion rate seamless oil casing pipe The tensile strength reaches 450MPa, the tensile strength reaches 750MPa, and the elongation rate is 30%. The hi...

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Abstract

The invention discloses steel for a high-expansion-rate petroleum casing and a method for manufacturing the petroleum casing, which relates to an iron-based alloy. The petroleum casing consists of the raw material elements in percentage by mass: 0.03-0.25 percent of C, 0.3-2.5 percent of Si, 0.5-4.0 percent of Mn, 0-0.5 percent of Cr, less than or equal to 0.02 percent of S, less than or equal to0.02 percent of P and the balance of Fe; one, two or three of 0.01-0.12 percent by mass of Nb, 0.01-0.06 percent by mass of Ti and 0.01-0.12 percent by mass of V can be added; a steel pipe blank or asteel plate is manufactured by smelting; and a high-expansion-rate seamless petroleum casing is manufacturing with the steel pipe blank by using a seamless pipe molding technology and a high-expansion-rate seamed petroleum casing is manufactured by adopting straight slit resistance welding with the steel plate. The expansion rate of the manufactured petroleum casing is more than or equal to 30 percent, and the defects of low expansion rate and high cost of the conventional expandable casing for an oil-gas well are overcome.

Description

technical field [0001] The technical solution of the invention relates to iron-based alloys, specifically steel for high-expansion oil casings and a method for making oil casings. Background technique [0002] Nowadays, the oil casing is lowered into the well using a step-by-step downward extension technology. The next-level casing passes through the upper-level casing, resulting in a smaller and smaller casing diameter. The expansion tube technology is to run the casing into the predetermined position in the well, transport the mud fluid through the middle pipe, and fill the gap space outside the casing, and then the expansion cone at the lower part is pushed by the liquid pressure to expand and expand the casing from bottom to top, so that A new technology of drilling, completion and workover in which the diameter of the casing is deformed to be close to the well wall. Applying this technology can realize single well diameter in deep wells, ultra-deep wells and harsh geol...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/34C22C38/28C22C38/26C22C38/24C21D9/08E21B17/00
Inventor 何继宁彭会芬宋开红姜延飞马晓莉李春福阎殿然罗平亚
Owner HEBEI UNIV OF TECH
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