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GB2269411B - A drill string - Google Patents

A drill string

Info

Publication number
GB2269411B
GB2269411B GB9216635A GB9216635A GB2269411B GB 2269411 B GB2269411 B GB 2269411B GB 9216635 A GB9216635 A GB 9216635A GB 9216635 A GB9216635 A GB 9216635A GB 2269411 B GB2269411 B GB 2269411B
Authority
GB
United Kingdom
Prior art keywords
drill string
drill
string
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB9216635A
Other versions
GB9216635D0 (en
GB2269411A (en
Inventor
Thomas Gerard Kiely
Peter Charles Brewitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boart Longyear Ltd
Original Assignee
Boart Hardmetals Europe Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boart Hardmetals Europe Ltd filed Critical Boart Hardmetals Europe Ltd
Priority to GB9216635A priority Critical patent/GB2269411B/en
Publication of GB9216635D0 publication Critical patent/GB9216635D0/en
Publication of GB2269411A publication Critical patent/GB2269411A/en
Application granted granted Critical
Publication of GB2269411B publication Critical patent/GB2269411B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
GB9216635A 1992-08-05 1992-08-05 A drill string Expired - Fee Related GB2269411B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9216635A GB2269411B (en) 1992-08-05 1992-08-05 A drill string

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9216635A GB2269411B (en) 1992-08-05 1992-08-05 A drill string

Publications (3)

Publication Number Publication Date
GB9216635D0 GB9216635D0 (en) 1992-09-16
GB2269411A GB2269411A (en) 1994-02-09
GB2269411B true GB2269411B (en) 1996-03-06

Family

ID=10719869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9216635A Expired - Fee Related GB2269411B (en) 1992-08-05 1992-08-05 A drill string

Country Status (1)

Country Link
GB (1) GB2269411B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850191A (en) * 1973-01-09 1974-11-26 Brown Oil Tools Check valve assembly
US4263936A (en) * 1979-10-09 1981-04-28 Brown Oil Tools, Inc. Erosion resistant check valve assembly
US4294314A (en) * 1979-12-31 1981-10-13 Hydril Company Inside blowout preventer well tool
GB2102474A (en) * 1981-07-13 1983-02-02 Hughes Tool Co Inside downhole blowout preventer
WO1984001600A1 (en) * 1982-10-12 1984-04-26 Hydril Co Retrievable inside blowout preventer valve apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850191A (en) * 1973-01-09 1974-11-26 Brown Oil Tools Check valve assembly
US4263936A (en) * 1979-10-09 1981-04-28 Brown Oil Tools, Inc. Erosion resistant check valve assembly
US4294314A (en) * 1979-12-31 1981-10-13 Hydril Company Inside blowout preventer well tool
GB2102474A (en) * 1981-07-13 1983-02-02 Hughes Tool Co Inside downhole blowout preventer
WO1984001600A1 (en) * 1982-10-12 1984-04-26 Hydril Co Retrievable inside blowout preventer valve apparatus

Also Published As

Publication number Publication date
GB9216635D0 (en) 1992-09-16
GB2269411A (en) 1994-02-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090805