WO1995021988A1 - Systeme de carottier - Google Patents

Systeme de carottier Download PDF

Info

Publication number
WO1995021988A1
WO1995021988A1 PCT/GB1995/000243 GB9500243W WO9521988A1 WO 1995021988 A1 WO1995021988 A1 WO 1995021988A1 GB 9500243 W GB9500243 W GB 9500243W WO 9521988 A1 WO9521988 A1 WO 9521988A1
Authority
WO
WIPO (PCT)
Prior art keywords
core barrel
core
inner core
receiving means
barrel
Prior art date
Application number
PCT/GB1995/000243
Other languages
English (en)
Inventor
Terry Moore
Original Assignee
Corpro Systems Limited
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 Corpro Systems Limited filed Critical Corpro Systems Limited
Priority to GB9616449A priority Critical patent/GB2301385B/en
Priority to AU15840/95A priority patent/AU1584095A/en
Publication of WO1995021988A1 publication Critical patent/WO1995021988A1/fr

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
    • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors

Definitions

  • the invention relates to a core barrel system and in particular, a core barrel system for obtaining geological core samples from a borehole during drilling of the borehole.
  • Conventional core barrel systems use an outer steel barrel and an inner barrel mounted within the outer barrel. As the borehole is drilled, the core sample enters the inner core barrel through a central aperture in the drill bit and as the hole is bored, the core slides up inside the inner barrel.
  • the inner barrel comprises a number of tubes coupled together by threaded joints.
  • the tubes are manufactured from steel where the inner core barrel is reusable, or aluminium or fibreglass where the inner core barrel is intended to be expendable.
  • plastic liner In recent years it has also become an option to use a plastic liner inside the outer barrel, the plastic liner typically being polycarbonate.
  • plastic liners one of the problems with plastic liners is that, although the cost is reduced, the compression loading performance of the plastic liner is poor in relation to the compression loading capabilities of steel, aluminium or fibreglass.
  • the use of plastic liners has only been successful for cores up to 60 feet long.
  • core barrel systems which can produce core lengths of at least 90 feet in length, and preferably over 100 feet long.
  • a typical core will be located within a number of tubes which are joined together end to end to form the inner core barrel. Therefore, it is necessary to split the tubes forming the core barrel in order to retrieve the core from the inner core barrel. Rotation of the inner core barrel tubes with respect to each other to separate the joints causes rotational stress on the core within the inner tubes and can cause damage and break-up of the core.
  • the tubes within which the core is located have to be separated in order to pass a conventional shear plate between adjacent tubes in order that each tube and corresponding core can be removed from the drill string. The insertion of the shear plate through the core and the pulling apart of the adjacent tubes can also cause damage to the core within the tubes.
  • a core barrel system comprises an outer core barrel, an inner core barrel mounted within the outer core barrel, a core receiving means mounted within the inner core barrel, and support formations extending into the inner core barrel, the inner core barrel comprising a number of tubular members coupled by coupling means in end to end relationship, and the core receiving means comprising a number of tubes mounted end to end within the inner core barrel on said support formations which extend to support the core receiving means against movement in a direction parallel to the longitudinal axis of the inner core barrel.
  • At least one support formation is located adjacent an end of each tubular member forming the inner core barrel.
  • the support formations may be in the form of support members which are located between adjacent ends of adjacent tubular members forming the inner core barrel when the tubular members are coupled to each other.
  • the support formations may be in the form of an annular ring which extends inwardly from the inside surface of the inner core barrel.
  • the annular ring may be a split ring configured so as to permit removal of one section of the ring from the inner core barrel while another section of the ring is retained between adjacent tubular members.
  • adjacent tubular members are coupled together by an annular nut which engages threads on an end of one tubular member and a shoulder formation on an adjacent end of another tubular member.
  • the core receiving means comprises a number of tubular sections, each tubular section being located between adjacent support formations.
  • the core receiving means may have a number of apertures therein to permit gas located within the core receiving means to pass from the inside of the core receiving means to the outside of the core receiving means.
  • the core receiving means is mounted substantially concentrically within the inner core barrel.
  • the apparatus also comprises centralising means to centralise the inner core barrel within the outer core barrel.
  • the centralising means is located on the external surface of the coupling means coupling the members to each other.
  • the core receiving means may be in the form of a liner which may be expendable and may be manufactured from a plastics material, such as polycarbonate, or from glass reinforced plastic, fibreglass, aluminium or steel.
  • Fig. 1 is a cross-sectional view through a core barrel system; and, Fig. 2 is a perspective view of shear plate clamp for use with the system shown in Fig. 1.
  • Fig. 1 shows a core barrel system 1 which comprises an outer core barrel 2, an inner core barrel 3 formed from a number of steel tubular members 4 (only two shown 4a, 4b) .
  • Each tubular member 4 has a shoulder end portion 5 at one end and threaded end portion 6 at the other end.
  • a threaded nut 7 is held captive on the shoulder end portion 5 by shoulder 8 on the shoulder end portion 5 and an end 9 of the tubular member 4, which traps a shoulder portion 10 on the nut 7.
  • the opposite end of the nut 7 from the end 10 has a female thread 11 formed on it which engages with a male thread 12 on the external surface of the threaded end portion 6.
  • split ring 13 Located between the adjacent ends of the shoulder portion 5 and threaded portion 6 is a split ring 13 which comprises two half portions 13a, 13b. A plastic tubular liner 14a, 14b abuts against each side of the split ring 13.
  • ribs 15 which act as a centraliser to centralise the inner barrel 3 within the outer barrel 2.
  • the end portions 5, 6 are permanently attached to opposite ends of each of the steel tubes 4a, 4b.
  • plastic liner 14a is inserted into lower tube 4a.
  • Upper tube 4b, with the threaded end portion 6, is then lowered into position trapping split ring 13 between the adjacent ends of the portions 5, 6 of the lower tube 4a and the upper tube 4b, respectively.
  • the nut 7 is then moved upwards and rotated to engage the threads 11, 12 so as to securely clamp the split ring 13 between the portions 5, 6.
  • the upper liner 14b can then be inserted into tube 4b and as the inner core barrel 3 is moved down within the outer core barrel 2, the upper tube 4b and upper liner 14b become the lower tube and liner when they are lowered so that end portion 5 of the tube 4b is in the position corresponding to the end portion 5 of tube 4a in Fig. 1.
  • a further split ring 13 and tube 4 are then added and the process is then continued until the desired length of inner core barrel 3 is obtained.
  • the upper end of the outer barrel 2 is then coupled on to the lower end of the upper drill string.
  • the core barrel system 1 is then run in the usual manner into a borehole above a drill bit. During drilling the core sample enters into the liners 14 and passes upwards through the liners 14.
  • the drill string can be retrieved from the borehole and the inner core barrel 3, with the liners 14, removed from the outer core barrel 2.
  • Each liner 14 has a number of apertures 17 which permit gas within core sample in the liner members 14 to pass from the inside of the liners 14 into annulus 16 between the inner core barrel 3 and the liners 14.
  • one half 13a of the split ring 13 may be removed and a shear plate clamp 20 (see Fig. 2) may be placed around the threaded end portion 6 and shoulder end portion 5.
  • the clamp 20 comprises two half sections 21, 22 coupled together by a hinge 23. A shoulder 24 on each half 21, 22 abuts against shoulder 25 on the threaded end portion 6 and prevents downward movement of the clamp 20 after the clamp 20 has been secured around the inner core barrel 3.
  • the clamp 20 is secured in position by a conventional bolting system which secures the two halves diametrically opposite the hinge 23.
  • Each clamp half 21, 22 has a slot 26 therein and, with the clamp 20 secured around the inner core barrel 3 with the shoulder 24 engaging the shoulder 25, the slot 26 corresponds to the position of the split ring 13.
  • the shear plate is pushed through the core sample, the other half 13b of the split ring 13 is pushed out of the liner 14 and inner core barrel 3 so that the shear plate separates the core sample in the upper liner 14b from the core sample in the lower liner 14a.
  • the upper tube 4b with the clamp 20 still attached can then be removed from the lower tube 4a and the core sample in the liner 14b subsequently removed from the liner 14b.
  • the operation is then repeated for the core sample within the lower liner 14a by engaging a core barrel lifting cap with female thread 11 on the nut 7 in order to pull the lower tube 4a upwards to permit a shear clamp 20 to be placed around threaded end portion 6 of the tube 4a so that the core sample within the liner 14a and tube 4a can then be removed in a similar manner to that described above for the core sample in liner 14b.
  • the advantages of the invention are that during removal of the core sample there is no relative rotation of the adjacent tubes 4a, 4b and tubes 4a, 4b do not require to be moved axially in order to insert the shear plate.
  • the liners 14 are supported against axial movement and against axial forces by the split ring 13 located between adjacent tube liners 14a, 14b.
  • apertures 17 provide for venting of gases within the core sample in a controllable manner and ribs 15 on the exterior surface of the nuts 7 centralise the inner barrel 3 within the outer barrel 2.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Un système de carottier comporte un tube carottier extérieur (2) et un tube carottier intérieur (3) constitué de plusieurs éléments tubulaires (4a, 4b) reliés ensemble par des écrous femelles (7), d'une structure de support (13) se prolongeant dans le tube carottier intérieur (3) et d'un tubage recevant la carotte et constitué de plusieurs tubes (14a, 14b) fixés bout à bout dans le tube carottier intérieur (3) sur la structure de support (13) laquelle se prolonge pour supporter la colonne recevant la carotte contre les mouvements longitudinaux par rapport au tube carottier intérieur. La structure de support (13) peut consister en bagues fendues qui facilitent l'insertion de plaques de cisaillement dans la carotte tout en restreignant les mouvements du tubage par rapport à la carotte. Le tubage peut être pourvu d'ouvertures contribuant à évacuer toute pression excessive de gaz provenant de la carotte.
PCT/GB1995/000243 1994-02-08 1995-02-07 Systeme de carottier WO1995021988A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9616449A GB2301385B (en) 1994-02-08 1995-02-07 A core barrel system
AU15840/95A AU1584095A (en) 1994-02-08 1995-02-07 A core barrel system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9402356A GB9402356D0 (en) 1994-02-08 1994-02-08 A core barrel system
GB9402356.1 1994-02-08

Publications (1)

Publication Number Publication Date
WO1995021988A1 true WO1995021988A1 (fr) 1995-08-17

Family

ID=10750022

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/000243 WO1995021988A1 (fr) 1994-02-08 1995-02-07 Systeme de carottier

Country Status (3)

Country Link
AU (1) AU1584095A (fr)
GB (2) GB9402356D0 (fr)
WO (1) WO1995021988A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999002816A1 (fr) * 1997-07-08 1999-01-21 Dresser Industries Inc. Carottier
EP1715137A1 (fr) * 2005-04-22 2006-10-25 Corpro Systems Limited Tube carottier étanche

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2012391060B2 (en) * 2012-09-26 2017-02-02 Halliburton Energy Services, Inc. Method of placing distributed pressure gauges across screens

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3104725A (en) * 1963-09-24 buchele
GB2143562A (en) * 1983-07-13 1985-02-13 Diamond Oil Well Drilling Sponge coring apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3104725A (en) * 1963-09-24 buchele
GB2143562A (en) * 1983-07-13 1985-02-13 Diamond Oil Well Drilling Sponge coring apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999002816A1 (fr) * 1997-07-08 1999-01-21 Dresser Industries Inc. Carottier
BE1011266A3 (fr) * 1997-07-08 1999-07-06 Dresser Ind Carottier.
US6341656B1 (en) 1997-07-08 2002-01-29 Dresser Industries, Inc. Core barrel
EP1715137A1 (fr) * 2005-04-22 2006-10-25 Corpro Systems Limited Tube carottier étanche
US7600580B2 (en) 2005-04-22 2009-10-13 Corpro Systems Limited Sealed core sample barrel

Also Published As

Publication number Publication date
AU1584095A (en) 1995-08-29
GB9616449D0 (en) 1996-09-25
GB9402356D0 (en) 1994-03-30
GB2301385A (en) 1996-12-04
GB2301385B (en) 1997-04-09

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