A kind of low-carbon martensitic steel, 10,000-meter drilling rig lifting ring and preparation method thereof

A technology of martensitic steel and lifting rings, which is applied to drilling equipment, drill pipes, drill pipes, etc., can solve problems such as failure to meet the use requirements, reduce the formation of inclusions and harmful tissues, improve hardenability, and shorten the manufacturing cycle. short effect

Active Publication Date: 2022-01-04
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

For 12000m and above ultra-deep well drilling rigs with a section diameter of 180mm or even larger diameter suspension ring products, the current materials can no longer meet the use requirements

Method used

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  • A kind of low-carbon martensitic steel, 10,000-meter drilling rig lifting ring and preparation method thereof
  • A kind of low-carbon martensitic steel, 10,000-meter drilling rig lifting ring and preparation method thereof
  • A kind of low-carbon martensitic steel, 10,000-meter drilling rig lifting ring and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0034] The preparation method of suspension ring of the present invention specifically comprises the following steps:

[0035] (1) Refined into billet according to the following composition, its composition is calculated by mass percentage, including the following components:

[0036] C: 0.17% to 0.19%; Si: 0.20% to 0.25%; Mn: 0.6% to 0.7%; Cr: 1.5% to 1.6%; Mo: 0.7% to 0.8%; Ni: 4.1% to 4.3%; V: 0.13%~0.15%; S≤0.005% and P≤0.01%, the rest is iron and unavoidable impurities.

[0037](2) Electroslag remelting is performed on the steel billet to obtain an ingot with a diameter of not less than 690mm, the ingot is heated evenly, the heating temperature is controlled at 1180±10°C, and forging is carried out, and the termination temperature of forging is controlled above 860°C to obtain Round steel with a diameter of 350mm to 380mm shall be annealed at no lower than 400°C after forging to eliminate forging defects and residual stress;

[0038] (3) Heat the round steel to 1180±10°...

Embodiment 1

[0042] The invention discloses a preparation method of a suspension ring, which specifically comprises the following steps:

[0043] (1) as shown in table 1, carry out refining into billet according to following composition, and its composition is calculated by mass percentage, comprises following component:

[0044] C: 0.17%; Si: 0.20%; Mn: 0.6%; Cr: 1.5%; Mo: 0.7%; Ni: 4.1%; Avoid impurities.

[0045] (2) Electroslag remelting is performed on the steel billet to obtain an ingot with a diameter of 690mm. The ingot is heated evenly to 1170°C for forging. The forging temperature is controlled at 860°C to 1170°C to obtain a circle with a diameter of 350mm to 360mm. For steel, after forging, the surface temperature is lowered to 400°C and annealed in the furnace;

[0046] (4) The round steel is reheated to 1170°C for forging, the forging temperature is controlled at 860°C to 1170°C, and a suspension ring sample with a diameter of 160mm is obtained by forging;

[0047] (5) Heat...

Embodiment 2

[0050] The invention discloses a preparation method of a suspension ring, which specifically comprises the following steps:

[0051] (1) as shown in table 1, carry out refining into billet according to following composition, and its composition is calculated by mass percentage, comprises following component:

[0052] C: 0.19%; Si: 0.25%; Mn: 0.7%; Cr: 1.6%; Mo: 0.8%; Ni: 4.3%; V: 0.15%; Avoid impurities.

[0053] (2) Electroslag remelting is performed on the steel billet to obtain an ingot with a diameter of 870mm, and the ingot is heated evenly to 1190°C for forging at a forging temperature of 860°C to 1170°C to obtain round steel with a diameter of 360mm to 380mm. After forging, the surface temperature is lowered to 450°C and annealed in the furnace;

[0054] (4) Reheat the round steel to 1190°C for forging, the forging start temperature is controlled at 860°C to 1170°C, and a ring sample with a diameter of 170mm is obtained by forging;

[0055] (5) Heat the suspension ri...

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Abstract

The invention belongs to the field of petroleum equipment manufacturing, and specifically discloses a low-carbon martensitic steel, which comprises the following components in terms of mass percentage: C: 0.17%-0.19%; Si: 0.20%-0.25%; Mn: 0.6% ~0.7%; Cr: 1.5%~1.6%; Mo: 0.7%‑0.8%; Ni: 4.1%~4.3%; V: 0.13%~0.15%; Unavoidable impurities, with high strength and toughness. The invention also discloses a 10,000-meter drilling rig suspension ring prepared by using the low-carbon martensitic steel, the diameter of which can reach 180 mm, and meets the use requirements of the 10,000-meter drilling rig suspension ring. The invention also discloses a preparation method of the suspension ring of the 10,000-meter drilling rig, which has low cost and short manufacturing period.

Description

technical field [0001] The invention belongs to the field of petroleum equipment manufacturing, and in particular relates to a low-carbon martensitic steel, a 10,000-meter drilling rig suspension ring and a preparation method thereof. Background technique [0002] The lifting ring is an important lifting component of the oil drilling rig. It is a solid bar forging and mainly bears tensile load and fatigue load. With the development of ultra-deep oil and gas drilling and the application of 10,000-meter drilling rigs, the requirements for the lifting capacity of the lifting ring are getting higher and higher, and the diameter of the lifting ring is getting larger and larger. In order to ensure the overall service safety of the lifting ring, it is required that its entire section have consistent mechanical properties. Especially the material at the center has high strength and toughness, which requires the steel for the ring to have sufficient hardenability and toughness. At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C21D1/18C21D1/26C21D6/00C21D8/06C21D9/40C21D9/52E21B19/02
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/002C21D1/26C21D6/004C21D6/005C21D6/008C21D8/065C21D9/525C21D9/40C21D1/18E21B19/02C21D2211/008
Inventor 李方坡
Owner BC P INC CHINA NAT PETROLEUM CORP
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