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Novel steel for non-magnetic drill collar and preparation method thereof

A non-magnetic drill collar, a new type of technology, applied in the direction of drilling equipment, drill pipe, drill pipe, etc., can solve the problem that the product cannot meet the drilling requirements, and achieve good magnetic properties, strong resistance to intergranular corrosion, and good magnetic properties.

Inactive Publication Date: 2010-03-03
HENAN SHENLONG GASOLINEEUM DRILLING TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Products produced with conventional austenitic chemical composition and processing methods cannot meet drilling requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The chemical composition of steel for φ79.4×9800mm non-magnetic drill collars is by weight: C 0.03%, Si0.2%, Mn18.5%, P0.036%, S0.008%, Cr16.5% , Mo0.40%, Ni1.0%, N0.45%, Nb0.10%. Using steel scrap, high-carbon ferrochromium, low-phosphorus steel scrap, ferrosilicon and other metals as raw materials, it adopts three-stage refining of molten steel in an electric furnace, a nitrogen-oxygen decarburization refining furnace, and an electroslag remelting furnace. After melting and pouring into ingots, forging Strengthening, including the following steps:

[0023] (1) Billet opening: Cast 3 tons of non-magnetic steel ingots into the trolley heating furnace and heat them to 1150°C, keep them warm for 6 hours, upsetting them to φ1200mm on a 2500-ton hydraulic press or hydraulic press, and then pulling them to length φ500×1500mm;

[0024] (2) Head cutting and rough turning: Cut off the remaining material with cracks at both ends on the machine tool, rough turn the o...

Embodiment 2

[0027] Example 2: The chemical composition of steel for φ165.1×9800mm non-magnetic drill collars is by weight: C 0.02%, Si 0.40%, Mn 19.0%, P0.032%, S0.006%, Cr17.0%, Mo0 .60%, Ni1.26%, N0.55%, Nb 0.09%. After the raw materials are poured into ingots through the smelting process, forging strengthening includes the following steps:

[0028] (1) Billet opening: Cast 3 tons of non-magnetic steel ingots into the trolley heating furnace, heat them to 1200°C, keep them warm for 7 hours, and upset them to φ1200mm on a 2500-ton hydraulic press or hydraulic press, and then pull them out to 1200mm. φ500×1500mm;

[0029] (2) Head cutting and rough turning: cut off the remaining material with cracks at both ends on the machine tool, and rough turn the outer circle to see the light according to the requirements of the drawing;

[0030] (3) Forging strengthening: Put the forging billet into the trolley heating furnace and heat it to 1180°C, and then first pull the forging piece to φ250×50...

Embodiment 3

[0032] Example 3: The chemical composition of steel for φ279.4×9800mm non-magnetic drill collars is by weight: C 0.02%, Si 0.6%, Mn20%, P0.040%, S0.01%, Cr18.5%, Mo0. 80%, Ni1.5%, N0.60%, Nb 0.10%. After the raw materials are poured into ingots through the smelting process, forging strengthening includes the following steps:

[0033] (1) Billet opening: Put 7 tons of non-magnetic steel ingot into the ingot shape, put it into the trolley heating furnace and heat it to 1200°C, keep it warm for 8 hours, upset it on a 2500-ton hydraulic press or hydraulic press to φ1500mm, and then pull it to φ550×3000mm;

[0034] (2) Head cutting and rough turning: cut off the remaining material with cracks at both ends on the machine tool, and rough turn the outer circle to see the light according to the requirements of the drawing;

[0035] (3) Forging strengthening: put the forging billet into the trolley heating furnace and heat it to 1200°C, and then first pull the forging piece to φ320×45...

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Abstract

The invention discloses a novel steel for a non-magnetic drill collar and a preparation method thereof. The steel for non-magnetic drill collar is made from the following chemical compositions by weight: not higher than 0.03% of C, not higher than 1.0% of Si, 18-22% of Mn, not higher than 0.045% of P, not higher than 0.03% of P, 13.0-18.5% of Cr, 0.4-0.8% of Mo, 0.4-3.0% of Ni, 0.25-0.6% of N andnot higher than 0.10% of Nb. The preparation method comprises the following steps: taking scrap steel, high carbon ferrochrome, low phosphor scrap steel, ferrosilicon and the like as raw materials; primarily melting the raw materials into molten steel by an electric furnace and refining by a nitrogen and oxygen decarburization refinery furnace and an electroslag remelting furnace in three stages,pouring to form keel blocks; and cogging and stretching, cutting ends and rough turning, forging and strengthening, and the like. The steel has stronger resistance to inter-granular corrosion and completely meet Standard method for detecting sensitivity of resistance to inter-granular corrosion of austenitic stainless steel GB / T 4334-2008 and ASTM A262-08; the steel has tensile strength 10-20% greater than API standard, high impact energy up to 100J and twice more than the standard of petroleum and natural gas industries, good magnetic property, relative magnetic permeability mur controllablebelow 1.005 (standard 1.01), excellent forging and machining performances and the like, and is also applicable to machining products such as nonmagnetic stabilizer, nonmagnetic extra-heavy drill rod,nonmagnetic bearing drill rod and nonmagnetic hanging pup joint.

Description

technical field [0001] The invention relates to a novel steel for non-magnetic drill collars and a preparation method thereof, belonging to the technical field of austenitic steels. Background technique [0002] At present, in the drilling process of oil, natural gas and coalbed methane, non-magnetic drill collars are often used. This material has extremely low magnetic permeability, good mechanical properties and corrosion resistance. Its purpose is to provide a non-magnetic drill collar for logging instruments Measurement environment affected by the drill string magnetic field. When in use, the high-sensitivity sensor is installed in the inner hole of the non-magnetic drill collar, and it is lowered to the bottom of the well with ordinary drill pipes and drill collars. Subsequent logging information is transmitted to the ground, enabling drillers and geological experts to effectively "see" real-time downhole conditions, thereby improving the success rate of drilling and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D7/13E21B17/16
Inventor 张建刚谢世龙张清明牛战波
Owner HENAN SHENLONG GASOLINEEUM DRILLING TOOLS
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