80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe and manufacturing method thereof

An 80ksi, anti-hydrogen sulfide technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problem that the anti-hydrogen sulfide stress corrosion performance of the weld area is difficult to guarantee, etc.

Active Publication Date: 2013-08-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Publication No. CN201010207915.1 patent application discloses high-frequency resistance welding petroleum casing steel and its manufacturing method, and relates to a high-frequency resistance petroleum casing steel used in a hydrogen sulfide environment. In its implementation example, when the carbon content is reduced to 0.15% When the content of Mn is increased, the weld seam treatment only adopts medium frequency induction normalizing treatment, and the hydrogen sulfide stress corrosion resistance of the weld seam area is difficult to guarantee

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  • 80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe and manufacturing method thereof
  • 80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The required specifications and components (wt%) are: C0.16, Si0.25, Mn0.7, P0.011, S0. 001, Cr0.5, Mo0.70, Nb0.03, V0.04; Ce0.0189; Ca0.002 coils for oil casing. The hot-rolled coil is welded into a Φ193.7×7.34mm straight coil through strip slitting, edge milling, FFX forming and HFW welding, adjusting the forming process and controlling the welding parameters (welding power 490KW, welding speed 15m / min). Seam welded pipe, followed by weld normalizing and weld treatment.

[0056] Using the medium frequency induction rapid heating method, reheat the HFW welded pipe with a specification of Φ193.7×7.34mm to 950°C at a heating rate of 40°C / s, and then enter the 12-roller unit at a speed of 1.0m / s for hot rolling and reduction. diameter, to obtain a tube blank with a specification of Φ139.7×7.72mm. Heat and hold the tube blank at 880°C for 45 minutes, then water quench, the quenching cooling rate is ≥50°C / s, and then temper at 680°C for 60 minutes. The bushing is kept wa...

Embodiment 2

[0058] The required specifications and components (wt%) are: C0.20, Si0.15, Mn0.3, P0.008, S0. 001, Cr0.4, Mo0.3, Nb0.05, V0.05, Ce0.0056, Ca0.002 coils for oil casing. The hot-rolled coil is welded into a Φ193.7×8.94mm straight coil through strip slitting, edge milling, FFX forming and HFW welding, adjusting the forming process and controlling the welding parameters (welding power 490KW, welding speed 12m / min). Seam welded pipe, followed by weld normalizing and weld treatment.

[0059] Using the medium frequency induction rapid heating method, the HFW welded pipe with a specification of Φ193.7×8.94mm is heated to 980°C at a heating rate of 40°C / s, and then enters a 12-roller unit at a speed of 0.8m / s for hot rolling reduction. diameter, to obtain a tube blank with a specification of Φ139.7×9.17mm. Heat and hold the tube blank at 920°C for 35 minutes, then water quench, quenching cooling rate ≥ 50°C / s, and then temper at 720°C for 55 minutes. After tempering, it is sent to ...

Embodiment 3

[0061] The required specifications and components (wt%) are: C0.18, Si0.20, Mn0.5, P0.008, S0. 001, Cr0.80, Mo0.5, Nb0.05, V0.03, Ce0.0120, Ca0.002 coils for oil casing. The hot-rolled coil is welded into a Φ193.7×10.05mm straight coil through strip slitting, edge milling, FFX forming and HFW welding, adjusting the forming process, and controlling the welding parameters (welding power 490KW, welding speed 10m / min). Seam welded pipe, followed by weld normalizing and weld treatment.

[0062] Using the medium frequency induction rapid heating method, reheat the HFW welded pipe with a specification of Φ193.7×10.05mm to 1050°C at a heating rate of 40°C / s, and then enter the 12-roller unit at a speed of 1m / s for hot rolling and reducing , to obtain a tube blank with a specification of Φ139.7×10.54mm. The above-mentioned tube blank is heated and kept at 950°C for 30 minutes, then water quenched, the quenching cooling rate is ≥50°C / s, and then tempered at 750°C for 50 minutes. Afte...

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Abstract

The invention provides a 80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe and a manufacturing method thereof. The 80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe comprises the following chemical components in percentage by weight: 0.15-0.20 of C, 0.15-0.25 of Si, 0.3-0.7 of Mn, less than or equal to 0.020 of P, less than or equal to 0.008 of S, 0.40-0.80 of Cr, 0.30-0.70 of Mo, 0.030-0.070 of Nb, less than or equal to 0.05% of V, 0.005%-0.20% of Ce, 0.001%-0.003% of Ca, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps of: rolling the components by a rolling plate, welding and forming a pipe blank, treating welding seams, reducing the diameter through thermal tension, carrying out thermal treatment on a whole pipe body, treating the surface of a coupling, and carrying out thread machining, thus manufacturing the petroleum casing pipe. The 80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe produced by the manufacturing method has strong toughness and good proportioning, the physical and chemical property index of the casing pipe reaches or exceeds the API (American Petroleum Institute) standard, the hydrogen sulfide stress corrosion resistant property of the casing pipe is superior to the threshold value of the hydrogen sulfide stress corrosion resistance stated in the standard, and the casing pipe can meet the mining requirements on oil and gas fields containing certain hydrogen sulfide.

Description

technical field [0001] The invention relates to an oil casing and a manufacturing method thereof, in particular to an oil casing resistant to hydrogen sulfide stress corrosion and a manufacturing method thereof. Background technique [0002] In the process of oil and gas field development, hydrogen sulfide gas may be produced in all aspects of oil and gas field exploitation due to the reduction of sulfate reducing bacteria, thermochemical reduction of sulfate, acidification and thermochemical decomposition of unstable sulfur-containing organic compounds. . Ordinary casing is used for containing H 2 When the oil and gas resources of S are exploited, the casing stress and H 2 Sudden failure occurs under the combined action of S gas, resulting in the scrapping of the casing string or the entire well. With the intensification of domestic oil and gas fields that are difficult to exploit, especially in Sichuan, Changqing, North China and Xinjiang, where oil and gas containing h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C21D8/10C21D9/08
Inventor 毕宗岳何石磊张峰白鹤韦奉李周波王军党涛唐俊王涛李远征王亮
Owner BC P INC CHINA NAT PETROLEUM CORP
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