WO2006096935A1 - Équipement de sondage - Google Patents

Équipement de sondage Download PDF

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Publication number
WO2006096935A1
WO2006096935A1 PCT/AU2006/000361 AU2006000361W WO2006096935A1 WO 2006096935 A1 WO2006096935 A1 WO 2006096935A1 AU 2006000361 W AU2006000361 W AU 2006000361W WO 2006096935 A1 WO2006096935 A1 WO 2006096935A1
Authority
WO
WIPO (PCT)
Prior art keywords
survey tool
determining means
barrel assembly
core barrel
azimuth
Prior art date
Application number
PCT/AU2006/000361
Other languages
English (en)
Inventor
Nicky Alfred Kleyn
Original Assignee
Reservoir Nominees Pty 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
Priority claimed from AU2005901329A external-priority patent/AU2005901329A0/en
Application filed by Reservoir Nominees Pty Ltd filed Critical Reservoir Nominees Pty Ltd
Publication of WO2006096935A1 publication Critical patent/WO2006096935A1/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
    • E21B25/16—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors for obtaining oriented cores

Definitions

  • the present invention relates to a survey tool for use in connection with a drill string.
  • the sampling of cores for geotechnical evaluation is typically achieved by use of a hollow core barrel assembly seated behind a rotary drill.
  • the core barrel assembly consists of an outer tube and an inner tube, with the outer tube coupled at a lower end to cutting means such as a diamond head drill bit.
  • the application of torsional and axial forces to the cutting means via the outer tube cause the cutting means to cut a substantially cylindrical core from a rock body.
  • the non-rotating inner tube passes over this core as the drill moves into the rock body, resulting in the core being held in the inner tube internal to the drill string.
  • rotation ceases and the core is detached from the rock body by the application of a shearing force at the drill bit.
  • the core can then be brought to the surface for evaluation and analysis.
  • Known methods of obtaining this information require the use of a number of separate measuring tools.
  • a core orientation measurement tool is mounted within the drill string. It has hitherto not been possible to also include an azimuth determining means within the drill string, as the steel body of the drill string causes fluctuations in the local magnetic field.
  • Known methods of acquiring azimuth information involve raising the core barrel assembly from the base of the drilled hole, removing the inner tube, and lowering into the space beneath the core barrel assembly a survey tool.
  • the survey tool includes accelerometers and magnetometers in order to determine the inclination and azimuth of the hole being drilled along with the temperature and the magnetic field strength. This operation can be both complex and time consuming.
  • the present invention attempts to overcome at least in part some of the aforementioned disadvantages.
  • a survey tool for use in relation with a drill string, the survey tool characterised in that it comprises an inclination determining means and an azimuth determining means, the survey tool being arranged to be located within a core barrel assembly, the core barrel assembly having at least a portion comprised of a non-magnetic material whereby the magnetic field measured by the azimuth determining means is not compromised by the body of the core barrel assembly.
  • a core barrel assembly characterised by having at least a portion comprised of a nonmagnetic material, the portion being arranged to house an azimuth determining means within the core barrel assembly.
  • a method of determining the azimuth of a drilled core location characterised in that the method comprises the steps of providing a core barrel assembly having at least a portion comprised of a non-magnetic material; providing an azimuth determining means with the portion of the core barrel assembly; and taking readings of azimuth from within the core barrel assembly during drilling of a core.
  • Figure 1 is a schematic view of a core barrel assembly as known in the prior art
  • Figure 2 is a schematic view of a survey tool in accordance with the present invention, for use in conjunction with a core barrel assembly as shown in Figure 1.
  • a core barrel assembly 10 including an outer tube 12, an inner tube 14, a head assembly 16 and a core bit 18.
  • the head assembly 16 is typically mounted to the inner tube 14 via an inner tube cap 20, which includes a stainless steel ball 22 located within a check valve 24, and a grease nipple 26 for the supply of lubricant to the head assembly 16.
  • the present invention provides for the addition of a survey tool encasing portion 28, as shown in Figure 2, which effectively replaces the inner tube cap 20.
  • the survey tool encasing portion 28 has an upper end 30 to which the head assembly 16 is mounted and a lower end 32 to which the inner tube 14 is mounted.
  • the upper end 30 includes a grease case 34, having a grease nipple 26. This allows, in use, the supply of lubricant to the head assembly 16.
  • the lower end 32 includes a ball retaining member 36.
  • a survey tool comprising a drill face angle and inclination determining means consisting of a plurality of accelerometers, and an azimuth determining means consisting of a magnetometer, is located within the survey tool cavity 40.
  • the survey tool is powered by a battery 42
  • the survey tool further includes means for transmitting data.
  • this means comprises an infra-red signalling means.
  • the means may be radio signalling means or cables.
  • the survey tool encasing portion is comprised of a non-magnetic material.
  • the material is titanium.
  • the survey tool encasing portion 28 locates within a survey tool location portion of the outer tube 12, between the inner tube 14 and the head assembly 16.
  • the survey tool location portion of the outer tube 12 comprises a detachable extension piece to the existing outer tube 12.
  • the survey tool location portion of the outer tube 12 is formed from a non-magnetic material such as titanium.
  • the survey tool location portion may be integral with the outer tube 12, with either the entire outer tube 12 or just the survey tool location portion being formed from a non-magnetic material such as titanium.
  • the survey tool takes measurements of drill face angle, inclination and/or azimuth during drilling. It will be appreciated that in the embodiment of the invention described above the survey tool will be substantially stationary as the outer tube 12 and core bit 18 rotate.
  • the azimuth determining means is arranged to rotate. Rotation of the azimuth determining means, it is anticipated, even out magnetic interference and may provide a more accurate reading. It will be appreciated that this rotation would be decoupled from the drill face angle and dip determining means.

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

Équipement de sondage pour une utilisation en relation avec un train de tiges de forage, ledit équipement comprenant un moyen de détermination d’inclinaison et un moyen de détermination d’azimut, caractérisé en ce que ledit équipement est agencé pour être situé dans une cavité (40) à l’intérieur d’une partie d’enrobement de l’équipement de sondage (28) d’un assemblage de tube carottier, dont une partie est formée d’un matériau non magnétique, de telle sorte que le champ magnétique mesuré par le moyen de détermination d’azimut n’est pas compromis par le corps de l’assemblage de tube carottier.
PCT/AU2006/000361 2005-03-18 2006-03-17 Équipement de sondage WO2006096935A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005901329A AU2005901329A0 (en) 2005-03-18 Survey tool
AU2005901329 2005-03-18

Publications (1)

Publication Number Publication Date
WO2006096935A1 true WO2006096935A1 (fr) 2006-09-21

Family

ID=36991210

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2006/000361 WO2006096935A1 (fr) 2005-03-18 2006-03-17 Équipement de sondage

Country Status (1)

Country Link
WO (1) WO2006096935A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013040641A1 (fr) * 2011-09-20 2013-03-28 Imdex Global B.V. Déploiement d'outil d'examen de trou de forage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4380264A (en) * 1980-12-24 1983-04-19 Drilling Development, Inc. Survey tool string
US4682421A (en) * 1985-02-26 1987-07-28 Shell Oil Company Method for determining the azimuth of a borehole
US5064006A (en) * 1988-10-28 1991-11-12 Magrange, Inc Downhole combination tool
US6854192B2 (en) * 2001-02-06 2005-02-15 Smart Stabilizer Systems Limited Surveying of boreholes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4380264A (en) * 1980-12-24 1983-04-19 Drilling Development, Inc. Survey tool string
US4682421A (en) * 1985-02-26 1987-07-28 Shell Oil Company Method for determining the azimuth of a borehole
US5064006A (en) * 1988-10-28 1991-11-12 Magrange, Inc Downhole combination tool
US6854192B2 (en) * 2001-02-06 2005-02-15 Smart Stabilizer Systems Limited Surveying of boreholes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013040641A1 (fr) * 2011-09-20 2013-03-28 Imdex Global B.V. Déploiement d'outil d'examen de trou de forage

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