US2003710A - Metal body resistant to fluctuating stresses - Google Patents

Metal body resistant to fluctuating stresses Download PDF

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Publication number
US2003710A
US2003710A US663155A US66315533A US2003710A US 2003710 A US2003710 A US 2003710A US 663155 A US663155 A US 663155A US 66315533 A US66315533 A US 66315533A US 2003710 A US2003710 A US 2003710A
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Prior art keywords
drill pipe
fluctuating
metal body
fluctuating stresses
stresses
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Expired - Lifetime
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US663155A
Inventor
Herbert W Graham
Samuel L Case
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Jones and Laughlin Steel Corp
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Jones and Laughlin Steel Corp
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Publication date
Application filed by Jones and Laughlin Steel Corp filed Critical Jones and Laughlin Steel Corp
Priority to US663155A priority Critical patent/US2003710A/en
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Publication of US2003710A publication Critical patent/US2003710A/en
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S285/00—Pipe joints or couplings
    • Y10S285/916—Molecular change
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/043—Upsetting and flanging tube end
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/049—Work hardening with other step

Definitions

  • This invention relates to metal bodies resistant to fluctuating stresses and is hereby particularly described as applied to a drill pipe, although it has numerous other applications:
  • drill pipes are subjected to severe and continuing fluctuating stresses, and in practice they frequently fail prematurely.
  • the failure is highly objectionable not only because of the shortened life of the drill pipe but also because, it often takes place while the string of drill pipe is in the ground, frequently causing lost time and considerable expense for fishing.
  • the threads constitute relatively sharp changes in surface conflgurationof the drill pipe and it has been observed that failures of bodies subjected to fluctuating stresses are generally initiated at such point.
  • FIG. 1 illustrates part of a string of drill pipes.
  • Each drill pipe has a body 2 and thickened end portions 3 exteriorly threaded as at 4 to accommodate couplings 5.
  • the zone of cold work as extending over the threads. It will be understood that the couplings may be likewise cold worked and that if desired the cold working may extend over the entire article or over other selected parts thereof.
  • a drill pipe made of substantially non-aging steel the drill pipe being in the form of a. hollow tube having a thickened .end portion, which thickened end portion is threaded, the threaded portion at least being cold worked.
  • a drill pipe made of substantially non-aging steel the drill pipe being in the form of a hollow tube having a thickened end portion, which thickened end portion is threaded, the threaded portion at least being cold worked, and a coupling threaded to engage said end portion of the drill pipe, the coupling being made of substantially non-aging steel and being cold worked.
  • a metal body resistant to fluctuating stresses the body being madeof non-aging steel and having at least a portion thereof of enhanced resistance to fluctuating stress, said portion being cold worked.
  • drill pipe made of substantially non-aging steel resistant to fluctuating stresses, at least a portion thereof being of enhanced resistance to fluctuating stress, said portion being cold worked.
  • a drill pipe made of substantially non-aging steel resistant to fluctuating stresses, the drill pipe having a threaded end portion of enhanced resistance to fluctuating stress, said end portion being cold worked.

Description

June 4, 1935.
' H. W. GRAHAM El AL METAL BODY RESISTANT TO FLUCTUATING STRESSES Filed March 28, 1955 INVENTORS M w-M g/4 MZM J 2 Y6,
Zone of Cold Work Patented June 4, 1935 PATENT OFFICE METAL BODY RESISTANT T0 FLUCTUATING STRESSES Herbert W. Graham and Samuel L. Case, Pittaburgh, Pa., assignors to Jones & Laughlin Steel Corporation, Pittsburgh, Pa., a corporation of Pennsylvania Application March 28, 1933, Serial No. 663,155
5 Claims.
This invention relates to metal bodies resistant to fluctuating stresses and is hereby particularly described as applied to a drill pipe, although it has numerous other applications:
To take the example stated, drill pipes are subjected to severe and continuing fluctuating stresses, and in practice they frequently fail prematurely. The failure is highly objectionable not only because of the shortened life of the drill pipe but also because, it often takes place while the string of drill pipe is in the ground, frequently causing lost time and considerable expense for fishing. The threads constitute relatively sharp changes in surface conflgurationof the drill pipe and it has been observed that failures of bodies subjected to fluctuating stresses are generally initiated at such point.
We have found that these defects may be overcome by making the body of steel having special characteristics, and subjecting it, particularly in those portions where failure is most likely to ocour, to a special treatment; which we have found greatly enhances the life of the article.
We use a non-aging steel which may be obtained, for example, by adding aluminum to the steel in the amount of one to three pounds per ton; or an equivalent amount of an iron-aluminum alloy may be added. If desired, more aluminum may be added, but it will be found that five pounds per ton will probably be suflicient in any case. This steel is processed in the usual way and the article is made therefrom. It is then subjected to cold work. This may be done by cutting the thread and thereafter subjecting it to the action of a. rolling or burnishing tool. On a drill pipe, for example, the tool may be used to apply cold work in an amount sufficient to reduce the diameter of the thread slightly, say about onethousandth of an inch. It will be found that by making the article of non-aging steel and subjecting it to cold work its qualities of resistance to fluctuating stress are greatly enhanced.
The accompanying figure of drawing illustrates part of a string of drill pipes. Each drill pipe has a body 2 and thickened end portions 3 exteriorly threaded as at 4 to accommodate couplings 5. On the drawing we have indicated the zone of cold work as extending over the threads. It will be understood that the couplings may be likewise cold worked and that if desired the cold working may extend over the entire article or over other selected parts thereof.
We have described a present preferred embodiment of our invention. It will be understood, however, that this is by way of illustration only and that it may be otherwise embodied or practiced within the scope of the following claims.
We claim:
1. As a new manufacture, a drill pipe made of substantially non-aging steel, the drill pipe being in the form of a. hollow tube having a thickened .end portion, which thickened end portion is threaded, the threaded portion at least being cold worked.
2.'As a new manufacture, a drill pipe made of substantially non-aging steel, the drill pipe being in the form of a hollow tube having a thickened end portion, which thickened end portion is threaded, the threaded portion at least being cold worked, and a coupling threaded to engage said end portion of the drill pipe, the coupling being made of substantially non-aging steel and being cold worked.
3. As a new manufacture, a metal body resistant to fluctuating stresses, the body being madeof non-aging steel and having at least a portion thereof of enhanced resistance to fluctuating stress, said portion being cold worked.
4. As a new manufacture, drill pipe made of substantially non-aging steel resistant to fluctuating stresses, at least a portion thereof being of enhanced resistance to fluctuating stress, said portion being cold worked.
5. As a new manufacture, a drill pipe made of substantially non-aging steel resistant to fluctuating stresses, the drill pipe having a threaded end portion of enhanced resistance to fluctuating stress, said end portion being cold worked.
HERBERT W. GRAHAM. SAMUEL L. CASE.
US663155A 1933-03-28 1933-03-28 Metal body resistant to fluctuating stresses Expired - Lifetime US2003710A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676820A (en) * 1951-09-24 1954-04-27 Reed Roller Bit Co Drill collar
EP0199428A2 (en) * 1985-04-23 1986-10-29 The Babcock & Wilcox Company Manufacture of tubular members with at least one enlarged end

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676820A (en) * 1951-09-24 1954-04-27 Reed Roller Bit Co Drill collar
EP0199428A2 (en) * 1985-04-23 1986-10-29 The Babcock & Wilcox Company Manufacture of tubular members with at least one enlarged end
US4649728A (en) * 1985-04-23 1987-03-17 The Babcock & Wilcox Company Integral joint forming of work-hardenable high alloy tubing
EP0199428A3 (en) * 1985-04-23 1988-11-30 The Babcock & Wilcox Company Manufacture of tubular members with at least one enlarged end

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