Heat treated heavy weight drill pipe

Patent metadata

Field	Value
Publication number	US-2016305194-A1
Application number	US-201514685847-A
Country	US
Kind code	A1
Filing date	Apr 14, 2015
Priority date	Apr 14, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

A heavy weight drill pipe may include a tube body formed of AISI 1340 alloy steel, and first and second tool joints at respective ends of the tube body, and which are formed of an AISI 41XX series alloy steel. The first and second tool joints may be welded to the tube body at a weld line within a weld region. A Charpy impact toughness at the weld line or surrounding weld region may be least 12 ft-lbs. (16.5 N-m). Yield and tensile strengths at the weld line or weld region may be at least 65 ksi (448.0 MPa) and at least 106 ksi (731.0 MPa), respectively. Material properties at the weld line or weld region may be achieved by heat treating after welding. Heat treating may include austenitizing, quenching, and tempering the weld line and/or the surrounding weld region.

First claim

What is claimed is:

1 . A heavy weight drill pipe comprising:
a tube body formed of AISI 1340 alloy steel; a first tool joint at a first end of the tube body; and a second tool joint at a second end of the tube body, the first and second tool joints being formed from an AISI 41XX series alloy steel and welded to the tube body, a Charpy impact toughness at a heat treated weld line or a weld region surrounding the weld line of the first or second tool joint being at least 12 ft-lb (16 N-m) at −4° F. (−20° C.).

2 . The heavy weight drill pipe of claim 1 , the Charpy impact toughness being at least 13 ft-lbs. (17.5 N-m) at −4° F. (−20° C.).

3 . The heavy weight drill pipe of claim 1 , the Charpy impact toughness being at least 15 ft-lbs. (20.5 N-m) at −4° F. (−20° C.).

4 . The heavy weight drill pipe of claim 1 , the Charpy impact toughness being at least 20 ft-lbs. (27.0 N-m) at −4° F. (−20° C.).

5 . The heavy weight drill pipe of claim 1 , the Charpy impact toughness being at least 30 ft-lbs. (40.5 N-m) at −4° F. (−20° C.).

6 . The heavy weight drill pipe of claim 1 , the Charpy impact toughness being at least 40 ft-lbs. (54.0 N-m) at −4° F. (−20° C.).

7 . The heavy weight drill pipe of claim 1 , the first and second tool joints being formed from an AISI 41XX series alloy steel selected from the group consisting of AISI 4145, AISI 4137, AISI 4135, AISI 4140, AISI 4142, AISI 4147, and combinations thereof.

8 . The heavy weight drill pipe of claim 1 , the first and second tool joints being welded to the tube body on a tapered portion between a respective one of the first and second tool joints and the tube body.

9 . The heavy weight drill pipe of claim 1 , the tube body having a wall thickness from 0.63 in. (1.59 cm) to 1.06 in. (2.70 cm).

10 . A heavy weight drill pipe comprising:
a tube body formed of AISI 1340 alloy steel; a first tool joint formed of an AISI 41XX series alloy steel welded to a first end of the tube body at a first weld line within a first weld region; and a second tool joint formed of an AISI 41XX series alloy steel welded to a second end of the tube body at a second weld line within a second weld region, at least one of the first or second weld lines or weld regions having yield strength of at least 65 ksi (448.0 MPa), a tensile strength of at least 106 ksi (731.0 MPa), or both.

11 . The heavy weight drill pipe of claim 10 , the at least one of the first or second weld lines or regions having:
a yield strength of at least 75 ksi (517.0 MPa); a tensile strength of at least 108 ksi (744.5 MPa); and a Charpy impact toughness of at least 25 ft-lbs. (34.0 N-m) at −4° F. (−20° C.).

12 . A method of manufacturing a pipe, the method comprising:
welding a first tool joint formed of AISI 41XX series alloy steel to a first end of a tube body formed of AISI 1340 alloy steel; welding a second tool joint formed of AISI 41XX series alloy steel a second end of the tube body; and heat treating (i) at least one of a first weld line or a first weld region surrounding the first weld line, located between the first tool joint and the first end of the tube body, and (ii) at least one of a second weld line or a second weld region surrounding the second weld line, located between the second tool joint and the second end of the tube body, the heat treating including:
austenitizing the first and second weld lines or the first and second weld regions by heating the first and second weld lines or the first and second weld regions to an austenitizing temperature of at least 1,550° F. (843.5° C.);
quenching the first and second weld lines or the first and second weld regions following austenitizing; and
after quenching, tempering the first and second weld lines or the first and second weld regions by heating to a tempering temperature of at least 1,200° F. (649.0° C.).

13 . The method of claim 1212 , the austenitizing temperature being at least 1,600° F. (871.0° C.).

14 . The method of claim 12 , the austenitizing temperature being at least 1,650° F. (899.0° C.).

15 . The method of claim 12 , the austenitizing temperature being from 1,675° F. (913.0° C.) to 1725° F. (940.5° C.).

16 . The method of claim 12 , the tempering temperature being between 1,220° F. (660.0° C.) and 1,325° F. (718.5° C.).

17 . The method of claim 12 , the tempering temperature being between 1,270° F. (688.0° C.) and 1,305° F. (707.0° C.).

18 . The method of claim 12 , at least one of the first weld line, first weld region, second weld line, or second weld region having a Charpy impact toughness after the heat treating of at least 12 ft-lbs (16 N-m) at −4° F. (−20° C.).

19 . The method of claim 12 , at least one of the first weld line, first weld region, second weld line, or second weld region having a Charpy impact toughness after the heat treating of at least 24 ft-lbs. (32.5 N-m) at −4° F. (−20° C.).

20 . The method of claim 12 , at least one of the first or second tool joints being from AISI 4145 or AISI 4137 alloy steel.

Assignees

• Smith International

Inventors

• Jiang Wenhui
• Liu Fengxiao
• Lockstedt Alan W
• Brinegar Doyle Wayne

Classifications

• B23K20/129

  specially adapted for particular articles or work · CPC title

• B23K31/02

  relating to soldering or welding · CPC title

• B23K2103/04

  Steel {or steel} alloys · CPC title

• E21B17/16

  Drill collars · CPC title

• C21D1/56

  characterised by the quenching agents · CPC title