EP0212811A1 - Explosion compensator - Google Patents

Explosion compensator Download PDF

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Publication number
EP0212811A1
EP0212811A1 EP86305065A EP86305065A EP0212811A1 EP 0212811 A1 EP0212811 A1 EP 0212811A1 EP 86305065 A EP86305065 A EP 86305065A EP 86305065 A EP86305065 A EP 86305065A EP 0212811 A1 EP0212811 A1 EP 0212811A1
Authority
EP
European Patent Office
Prior art keywords
compensator
explosive
parts
bore hole
longitudinal
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Withdrawn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
EP86305065A
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 EP0212811A1 publication Critical patent/EP0212811A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
    • F42D5/045—Detonation-wave absorbing or damping means
    • 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
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/119—Details, e.g. for locating perforating place or direction
    • E21B43/1195—Replacement of drilling mud; decrease of undesirable shock waves

Definitions

  • the invention relates to a compensator for supporting an explosive severing device in a bore hole below a well head and for damping forces arising on explosion of the explosive severing device in the bore hole.
  • a compensator for supporting an explosive severing device in a bore hole below a well head and for damping forces arising on explosion of the explosive severing device in the bore hole, comprising two parts mounted for relative longitudinal slidable motion one of which has means for supporting the explosive device in the bore hole, the arrangement of the two parts being such as to dissipate upwardly directed forces arising on explosion of the device in the bore hole.
  • the parts may comprise through holes each of which may have a central axis lying substantially at right angles to the axis of longitudinal slidable motion.
  • the two parts may comprise two cylindrical elements, mounted one within the other, and there may be guide means connecting the two parts for said longitudinal slidable motion.
  • the guide means may comprise opposed longitudinal slots in the external one of the parts and two opposed projecting locking pins of the internal one of the parts, each pin passing through a respective adjacent slot of said opposed longitudinal slots.
  • the pins may each include a restraining device preventing removal thereof from the respective slot.
  • the restraining device may comprise a locking ring.
  • the inner one of the two cylindrical parts may have a tapered nose comprising said means for supporting the explosive device in the bore hole.
  • the tapered nose may include a transverse slot and opposite bore for receiving pin means for connecting the explosive device with the compensator.
  • the compensator may include means to ensure alignment of the compensator when landing the compensator in the bore hole.
  • the alignment means may comprise a shear pin means extending through the two parts transversely to the axis of longitudinal motion, whereby the pin shears on imposition of a longitudinal shear force.
  • an explosive severing system including a compensator as hereinbefore defined, and an explosive device supported by the one part.
  • the system may include a packer assembly between the one part and the explosive device.
  • a compensator 1 for supporting an explosive severing device 2 in a bore hole 3 below a well head (not shown) and for damping forces arising on explosion of the explosive severing device 2 in the bore hole.
  • the compensator 1 comprises two parts 4 (Figs. 1 to 4) and 5 (Figs. 5 and 6) mounted for relative longitudinal slidable motion.
  • One part 4 has means 6 for supporting the explosive device 2 in the bore hole 3, and at least one of the parts (in this case both parts 4 and 5) has means in the form of through holes 7 for dissipating laterally, upwardly directed forces arising on explosion of the device in the bore hole.
  • the one part 4 is an elongate member such as a rod or cylindrical tube, and the through holes 7 are arranged at 100 mn spacings along the length thereof, the holes 7 at one longitudinal position, being directed in a direction at 90° to the direction of the holes 7 at the next adjacent one, the axes of all the holes 7 being at 90° to the longitudinal axis of the part 4 (which axis coincides with the axis of longitudinal slidable motion). All the holes 7 thus extend from the external surface of the part 4 to intercept the bore of the part 4.
  • the part 4 also has two further holes 8, larger in diameter than the diameter of the holes 7, which are seatings for locking pins 9 which are received in slots 9' in the part 5, which slots and pins provide means for connecting the two parts 4 and 5 for longitudinal slidable motion.
  • the part 5 is a drill pipe and also has means in the form of spaced through holes 7 for dissipating laterally, upwardly directed forces arising on explosion of the device 2 in the bore hole 3.
  • the through holes 7 in part 5 are arranged at 150 mm spacings longitudinally of the part 5, the holes 7 at one level also being offset by 90° with respect to the holes 7 at the next adjacent level. The axes of all the holes 7 are thus directed to the longitudinal axis of the part 5, and the holes 7 all extend from the external surface of the part to intercept the bore thereof.
  • Both parts 4 and 5 have holes 10 (Figs. 5 and 6) which when the compensator 1 is initially assembled with the part 4 inside the part 5 are aligned and through which a shear pin 11 is inserted and held with a split pin 12 (Fig. 7).
  • the part 4 has a tapered (frusto-conical) nose 13 comprising part of the means 6 by which it is connected through an articulated joint including a connecting pin 14 and locking ring (not shown) with a first (top in use and as viewed in Fig. 8) packer 15, which in turn supports, via an articulated joint, the explosive severing device 2 in the form of an explosive charge.
  • the charge 2 in turn supports a second (lower in use and as viewed in Fig. 8) packer 16.
  • the system of Fig. 8 In use to sever a sub-sea well head, the system of Fig. 8 is assembled as shown and is landed in the bore hole beneath the well head, the packers 15 and 16 providing a guide as they fit in the bore hole 3 with a sliding fit.
  • the shear pin 11 ensures correct alignment of the compensator 1 when landing at the well head, and shears should the system be improperly aligned so preventing damage to the compensator, and well head.
  • the compensator 1 As the system is sub-sea, the compensator 1 is full of water, in the bore hole.
  • shock waves would normally be transmitted therethrough up the bore hole 3 with possible destruction of the compensator 1 and damage to the well head and surface or semi-submersible vessels above or in the vicinity of the explosion.
  • the compensator 1 embodying the invention described herein obviates this destructive force by the shear pin 11 shearing, so allowing the inner part 4 of the compensator to ride up inside the outer part 5 in relative longitudinal sliding motion.
  • the inner part 4 lies at the bottom (as viewed) of the hollow outer part and is in compression.
  • the shock waves travel longitudinally internally of the part 4, placing it under tension rather than compression, and the tensile stresses start it moving, rapidly, upwardly in the outer part 5. If it was solid with this part, the forces would be transmitted up the drill pipe to the surface with possibly disastrous destructive results. However, it is not solid with the pipe it can ride freely upwardly therein, being guided by the pins 9 in the slots 9'.
  • the shock waves which are engendered in the part 4 place it in motion and under tension, rapidly arrive at its upper planar face. As the part 4 is not solid with the part 5, these waves cannot be transmitted upwardly.
  • the system shown in Fig. 9 is similar to that shown in Fig. 8, and acts in exactly the same way to dissipate the explosive forces, by oscillation of part 4.
  • the part 4 in this embodiment is however connected to the top packer 3 by an additional elongate member or pipe 18 which is destroyed when the explosive charge 2 is detonated. This "disconnects" the system, and sets the part 4 in motion as described with respect to the Fig. 8 embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Saccharide Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
EP86305065A 1985-07-10 1986-06-30 Explosion compensator Withdrawn EP0212811A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8517488 1985-07-10
GB858517488A GB8517488D0 (en) 1985-07-10 1985-07-10 Explosion compensator

Publications (1)

Publication Number Publication Date
EP0212811A1 true EP0212811A1 (en) 1987-03-04

Family

ID=10582112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86305065A Withdrawn EP0212811A1 (en) 1985-07-10 1986-06-30 Explosion compensator

Country Status (5)

Country Link
EP (1) EP0212811A1 (da)
CN (1) CN86104635A (da)
DK (1) DK309486A (da)
GB (1) GB8517488D0 (da)
NO (1) NO862680L (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0509741A1 (en) * 1991-04-16 1992-10-21 Jet Research Center, Inc. Tool string shock attenuating apparatus and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1856912A (en) * 1930-06-04 1932-05-03 Dow Chemical Co Improved method of shooting wells
US2191781A (en) * 1939-04-26 1940-02-27 Lane Wells Co Pressure compensator for gun perforators
GB2125470A (en) * 1982-08-19 1984-03-07 Vann Inc Geo Differential vent and bar actuated circulating valve and method
FR2534624A1 (fr) * 1982-10-15 1984-04-20 Commissariat Energie Atomique Procede et dispositif pour le decoupage pyrotechnique d'un tube immerge
US4510999A (en) * 1982-06-07 1985-04-16 Geo Vann, Inc. Well cleanup and completion method and apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1856912A (en) * 1930-06-04 1932-05-03 Dow Chemical Co Improved method of shooting wells
US2191781A (en) * 1939-04-26 1940-02-27 Lane Wells Co Pressure compensator for gun perforators
US4510999A (en) * 1982-06-07 1985-04-16 Geo Vann, Inc. Well cleanup and completion method and apparatus
GB2125470A (en) * 1982-08-19 1984-03-07 Vann Inc Geo Differential vent and bar actuated circulating valve and method
FR2534624A1 (fr) * 1982-10-15 1984-04-20 Commissariat Energie Atomique Procede et dispositif pour le decoupage pyrotechnique d'un tube immerge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WORLD OIL, vol. 188, no. 6, May 1979, pages 72-74, Houston, Texas, US; E.F. BRIEGER: "New perforator anchor allows high backsurge pressures" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0509741A1 (en) * 1991-04-16 1992-10-21 Jet Research Center, Inc. Tool string shock attenuating apparatus and method

Also Published As

Publication number Publication date
CN86104635A (zh) 1987-01-07
NO862680L (no) 1987-01-12
DK309486D0 (da) 1986-06-27
GB8517488D0 (en) 1985-08-14
NO862680D0 (no) 1986-07-02
DK309486A (da) 1987-01-11

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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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Effective date: 19871105

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Inventor name: SMETHAM, JAMES NIGEL

Inventor name: LAZARI, LAZARIS