EP0211515A2 - Apparatus for severing a wellhead - Google Patents

Apparatus for severing a wellhead Download PDF

Info

Publication number
EP0211515A2
EP0211515A2 EP86305064A EP86305064A EP0211515A2 EP 0211515 A2 EP0211515 A2 EP 0211515A2 EP 86305064 A EP86305064 A EP 86305064A EP 86305064 A EP86305064 A EP 86305064A EP 0211515 A2 EP0211515 A2 EP 0211515A2
Authority
EP
European Patent Office
Prior art keywords
fuse
charge
explosive
casing
fuse device
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.)
Withdrawn
Application number
EP86305064A
Other languages
German (de)
English (en)
French (fr)
Inventor
James Nigel Smetham
Lazaris Lazari
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.)
Baker Hughes Energy Technology UK Ltd
Original Assignee
CE Vetco UK 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 CE Vetco UK Ltd filed Critical CE Vetco UK Ltd
Publication of EP0211515A2 publication Critical patent/EP0211515A2/en
Withdrawn legal-status Critical Current

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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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/12—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground specially adapted for underwater installations
    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/02—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground by explosives or by thermal or chemical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition

Definitions

  • Explosive cutting charges currently are large, inefficient and unreliable resulting in a reluctance to use them.
  • the brittle medium may comprise a plastic foam material.
  • the brittle medium may alternatively comprise concrete.
  • the respective sleeves may comprise concentric right cylinders whereby to provide an annular space therebetween.
  • the apparatus may comprise means for detonating the charge substantially simultaneously at each end.
  • the means for providing substantial simultaneous detonation may comprise an explosive fuse in one fuse device and an explosive fuse running from the one fuse device to the other fuse device, both fuses being substantially of the same length.
  • the one fuse device may have guide means extending therefrom through the space between the sleeves to the other fuse device, the guide means receiving and guiding the explosive fuse between the fuse devices.
  • the guide means may comprise two substantially rigid tubes which extend from the one fuse device through the space between the sleeves to the other fuse device.
  • the other fuse device may have sockets for receiving the ends of the tubes.
  • Each fuse device may comprise a plane wave former.
  • Each fuse device may comprise a body having an inner and an outer shell, the space between the shells containing a brittle medium.
  • the brittle medium may comprise a foam plastics material or a cementitious material e.g. cement.
  • the inner sleeve of the casing and the inner shell of the or each fuse device may be substantially of the same diameter, and the outer sleeve of the casing and the outer shall of the or each fuse device may be substantially of the same diameter.
  • a fuse detonating cord may be connected to a central point at one end of the explosive charge and to a central point at the opposite end of the charge.
  • the detonating cord may comprise four lengths running to two junction boxes at the base of the charge, a length of fuse detonating cord running from one fuse box to one end of the charge and from the other fuse box to the other end of the charge, the two lengths being substantially equal.
  • the four lengths may be substantially 90° apart.
  • apparatus 1 for severing a wellhead of a sub-sea well system using an explosive charge 2 shown in dashed lines in Figure 1.
  • the apparatus 1 comprises two fuse devices 3 and 4 connected to a casing or housing 5 for the charge 2.
  • Housing the charge 2 within the casing 5 means that a standard weight of explosive can be used for different thicknesses of wellhead to be severed, while providing a minimum thickness of explosive to detonate at a maximum explosive effect. This is in contrast to the prior art, where the explosive is wrapped round a central core. In that arrangement, twice as much explosive must be used for cutting a 40 cm diameter wellhead as a 20 cm one. Thus the present invention provides for a standarized charge.
  • the fuse devices 3 and 4 are each made of fibreglass and are secured one at each end to a respective ring 6 of the casing 5 using suitable securing means such as bolts through aligned holes 7.
  • the fuse devices 3 and 4 also contain a packing of a foam plastic material or a cementitious material, e.g. cement.
  • the casing 5 conprises two steel sleeves 11 and 12 which in the embodiment shown are coaxial, the charge being in the inner sleeve 11.
  • the outer sleeve 12 is of a diameter to pass down the inner diameter of the well casing.
  • the space 13 between the sleeves 11 and 12 is annular and contains a plastic foam filling, and there is means in the form of two tubes or columns 14 extending from the furse device 4 to the fuse device 3 for detonating the charge substantially simultaneously.
  • the foam filling in each case is one which has good shock transmitting properties, is brittle, and dense so as little energy as possible is absorbed on detonation.
  • the upper (in use) fuse device 3 contains a coiled explosive fuse terminating at the charge 2.
  • An explosive fuse of the same length as the coiled fuse extends along each column 14 in the space 13 to the bottom (in use) fuse device 4 where it contacts the charge 2, at a position opposite the point of contact of the other fuse.
  • the actual connection of the fuses can vary, but in one arrangement the fuse detonating cord starts at a central point at the tcp of the charge. There are four lengths, 90° apart runnig to two junction boxes 180° apart on the perimeter of the base. At the junction box, two lengths collide, and initiate a second run. One run travels back up into the charge. An equal length, contained in the bottom device, affixes in the opposite end. The end travelling back up into the top fuse unit meets the run from the opposite junction box at the apex of a plane wave former or generator centrally situated in the base of the top unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Shovels (AREA)
EP86305064A 1985-07-29 1986-06-30 Apparatus for severing a wellhead Withdrawn EP0211515A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8519111 1985-07-29
GB858519111A GB8519111D0 (en) 1985-07-29 1985-07-29 Severing wellhead

Publications (1)

Publication Number Publication Date
EP0211515A2 true EP0211515A2 (en) 1987-02-25

Family

ID=10583029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86305064A Withdrawn EP0211515A2 (en) 1985-07-29 1986-06-30 Apparatus for severing a wellhead

Country Status (5)

Country Link
EP (1) EP0211515A2 (da)
CN (1) CN86105631A (da)
DK (1) DK329086A (da)
GB (2) GB8519111D0 (da)
NO (1) NO863042L (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174956A1 (en) * 2014-05-12 2015-11-19 Halliburton Energy Services, Inc. Well-component severing tool with a radially-nonuniform explosive cartridge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8516542D0 (en) * 1985-06-29 1985-07-31 Deepwater Oil Services Ltd Cutting device
CN106930723B (zh) 2017-02-15 2019-01-18 中国石油大学(北京) 聚能捆绑型筑巢堵漏固壁装置及其在溶洞堵漏中的应用

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB707380A (en) * 1949-11-21 1954-04-14 Arwyn Randall Davies Improvements in or relating to cartridges for explosive charges
GB1367011A (en) * 1971-11-25 1974-09-18 Ridgeway J J Linear shaped-charge device
US4037536A (en) * 1975-09-08 1977-07-26 Imc Chemical Group, Inc. Enclosure for explosive material
US4184430A (en) * 1977-06-29 1980-01-22 Jet Research Center, Inc. Method and apparatus for severing tubing
US4290486A (en) * 1979-06-25 1981-09-22 Jet Research Center, Inc. Methods and apparatus for severing conduits
US4378844A (en) * 1979-06-29 1983-04-05 Nl Industries, Inc. Explosive cutting system
EP0057308B1 (en) * 1981-01-29 1985-05-02 Wang, Shu-Jen Apparatus and method of blasting undersea rocks
GB2134630B (en) * 1983-01-10 1986-10-15 Wang Su Jen Apparatus and method of blasting rocks
GB8410631D0 (en) * 1984-04-26 1984-05-31 Hotforge Ltd Explosive cutting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174956A1 (en) * 2014-05-12 2015-11-19 Halliburton Energy Services, Inc. Well-component severing tool with a radially-nonuniform explosive cartridge
US10145195B2 (en) 2014-05-12 2018-12-04 Halliburton Energy Services, Inc. Well-component severing tool with a radially-nonuniform explosive cartridge

Also Published As

Publication number Publication date
GB8615903D0 (en) 1986-08-06
GB2178831A (en) 1987-02-18
CN86105631A (zh) 1987-02-04
NO863042L (no) 1987-01-30
DK329086D0 (da) 1986-07-10
DK329086A (da) 1987-01-30
GB8519111D0 (en) 1985-09-04
NO863042D0 (no) 1986-07-28

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

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Effective date: 19880701

R18D Application deemed to be withdrawn (corrected)

Effective date: 19881231

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SMETHAM, JAMES NIGEL

Inventor name: LAZARI, LAZARIS