Steel used for solid expandable casing of oil and gas well and manufacturing method of expandable casing

A technology for expanding casing and oil and gas wells, which is applied in manufacturing tools, metal rolling, temperature control, etc., and can solve problems such as small effect sensitivity, reduced material plasticity, and low yield ratio

Active Publication Date: 2010-08-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is: to provide a new type of steel for the manufacture of high-performance solid expandable pipes for oil and gas wells, which overcomes the traditional ferrite pearlite and martensite The limited plastic deformation capacity of the expansion tube, and the defect that the plasticity of the material is significantly reduced after a certain amount of cold deformation occurs; a manufacturing method for the solid expandable casing of the oil and gas well is propo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mass percentage of steel alloy material for solid expandable casing of oil and gas well: C: 0.20%, Mn: 1.75%, Si: 1.55%, Al: 0.1%, P: 0.008%, S: 0.002%, N: 0.007%, Ca : 0.004%, Nb: 0.02%, Ti: 0.03%, Cu: 0.15%, Ni: 0.18%, and the rest is Fe.

[0024] Manufacture of solid expandable casing for oil and gas wells:

[0025] Firstly, hot-rolled coils are prepared: the above-mentioned steel materials (components) for the solid expandable casing of oil and gas wells are smelted under vacuum conditions, vacuum degassed, and continuously cast to make slabs with a thickness of about 250 mm. The slab was subjected to homogenization annealing at 1200° C. for 2 hours. Then reheat to about 1200°C, rough rolling at 1050-1100°C, finish rolling at 850-900°C, cooling rate after rolling at 20-25°C / s, and coiling temperature at 580-600°C to make hot-rolled coils.

[0026]Secondly, hot-rolled coils are used to produce straight seam resistance welded steel pipes: the edge milling process is...

Embodiment 2

[0031] Mass percentage of steel alloy material for solid expandable casing of oil and gas well: C: 0.16%, Mn: 1.70%, Si: 1.23%, Al: 0.54%, P: 0.009%, S: 0.004%, N: 0.007%, Ca : 0.005%, Nb: 0.06%, V: 0.04%, Cu: 0.19%, Ni: 0.24%, Mo: 0.22%, and the rest is Fe.

[0032] Manufacture of solid expandable casing for oil and gas wells:

[0033] First, steel preparation: the above-mentioned steel material (each component) for the solid expandable casing of the oil and gas well is smelted in an oxygen-blown converter, and then cast into a rod with a diameter of 200 mm, and homogenized annealed at 1200 ° C for 2 hours;

[0034] Next, make seamless steel pipes: heat the above bars to about 1200°C, perforate them at 1100°C and carry out hot rolling, and then normalize at 960±20°C to make seamless steel pipes with a thickness of 15mm.

[0035] Then, two-stage isothermal heat treatment is carried out: the above-mentioned tube blank is isothermally treated in the austenite + ferrite (γ + α) ...

Embodiment 3

[0039] Mass percentage of steel alloy material for solid expandable casing of oil and gas well: C: 0.21%, Mn: 1.95%, Si: 1.05%, Al: 0.7%, P: 0.009%, S: 0.003%, N: 0.007%, Ca : 0.007%, Nb: 0.03%, Ti: 0.04%, Ni: 0.21%, Cu: 0.17%, Mo: 0.18%, Cr: 0.20%, and the rest Fe.

[0040] Manufacture of solid expandable casing for oil and gas wells:

[0041] First, prepare hot-rolled coils: melting under vacuum conditions, continuous casting, and continuous casting into slabs with a thickness of about 250mm. Rough rolling at 800°C, finish rolling at 800°C, cooling rate after rolling at 23°C / s, coiling temperature at 530°C, to make hot-rolled coils with a thickness of 10mm.

[0042] Secondly, hot-rolled coils are used to produce straight seam resistance welded steel pipes: the edge milling process is used to precisely control the width of the strip steel, and the two plate edges are parallel to each other; the wave shape of the plate edge is controlled, and the roll forming process is adopt...

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Abstract

The invention relates to a steel used for a solid expandable casing of an oil and gas well and a manufacturing method of the expandable casing, which are applied to prepare the expandable casing of the oil and gas well in oil and gas industry. The steel alloy material used for the solid expandable casing of the oil and gas well comprises the following components in percentage by mass: 0.1-0.3% of C, 1.5-3.5% of Mn, 1-2.5% of Si, 0.1-3% of Al, less than or equal to 0.010% of P, less than or equal to 0.005 % of S, 0.003-0.010% of Ca, less than or equal to 0.0007% of N and the balance of Fe. The preparation method comprises the steps of vacuum melting, continuous casting and homogenizing annealing; hot rolled plate coils are prepared via controlling rolling and cooling, and the hot rolled plate coils are used for producing straight seam resistance welded steel pipes; and expandable pipe materials can be obtained via two stages of isothermal heat treatment. Threads are processed at both ends of each steel pipe. The invention has the effects that the expandable casing has the characteristics of high uniform elongation, high plasticity, low yield strength, low yield ratio and the like before expansion, and has high strength, enough plasticity, good welding seam quality and performance after expansive deformation.

Description

technical field [0001] The invention relates to a steel for an expandable casing for an entity in the oil and gas industry and a manufacturing method for the expandable casing. The steel for the expandable casing is made into a steel plate after vacuum melting, continuous casting, controlled rolling and controlled cooling, and then made into an expandable casing after straight seam resistance welding and heat treatment, or made into an expandable casing after continuous hot rolling and heat treatment. It is made into an expandable casing, which is used in oil field completion engineering. It is used after expansion and deformation in the downhole. The plasticity and strength before and after expansion are excellent. Background technique [0002] Solid expandable casing SET (Solid Expandable Tubular) technology is a new drilling, completion and workover technology that expands the casing string radially to the required diameter in the wellbore for the purpose of "saving" the ...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/14C22C38/16C22C38/38C22C38/58B21B37/74B21B37/16C21D1/26B23P15/00
Inventor 冯耀荣上官丰收李德君杨龙刘永刚宋生印
Owner BC P INC CHINA NAT PETROLEUM CORP
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