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CHRISTENSEN HUGEL CORE ORIENTATION SYSTEM
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Stratigraphic & structural analysis on vertical or angle holes
Determine directional permeability
Orientation of planes of foliation, lineation joints, and fractures
International Directional Services LLC core orientation service provides a core which has been scribed by
three tungsten carbide knives. Inset in the inner tube sub of the core barrel, spaces at 90, 120 and 150
degrees, these knives mark the core to show directional orientation. The knives are connected to a multi-shot
magnetic survey instrument, which records, on film, the hole inclination, direction and orientation of the
entire core.
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With this data and goniometer, a core analyst can accurately determine the dip and strike of bedding, foliation,
cleavage, healed or broken joints, contacts, and shears. Oriented petrographic thin sections for use in further
studies may also be obtained from the oriented core.
A Modern Approach to Obtaining Geological Information
Geologists have long recognized the value of oriented cores. The initial and most obvious use was to provide such
structural data as the dip and strike of inclined strata allowing for a more complete interpretation of structural
complications. This incentive led to the development of several core orientation techniques, but none were entirely
satisfactory and some were of questionable accuracy.
The IDS LLC oriented coring method appears to herald a reawakening in oriented coring as a reliable commercial means
wherever drilled cores are obtained, e.g., mineral exploration and development (uranium, metalics, non-metalics,
etc.), petroleum exploration (oil, gas, etc.), construction engineering (dam site evaluation, tunnels, bridges, etc.),
quarrying operations, and many others.
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Compared to indirect methods of obtaining geological information, an actual sample with known spatial position...in
the form of oriented core... inherently possesses more quantitative technical data for accurately defining the dip
and strike of formations, orientation of fractures and jointing, establishing directional permeability for
environmental or ground water assessments and geotechnical investigations for rock mechanics studies.
The IDS LLC oriented coring system, has scribed and oriented thousands of feet of core using near-conventional
wireline retrieved core barrels (Table). The system provides continuously scribed core in conjunction with borehole
azimuth and inclination data. Orientation data can be obtained on vertical, angle and horizontal boreholes. The
frequency of survey data can be varied depending upon the competency of the rock.
The IDS LLC orienting system's basic equipment consists of a multi-shot directional survey instrument, a
modified double-tube core barrel, a diamond impregnated core bit, and the "Hugel" scribing sub situated
immediately above the core bit. The special Hugel shoe contains three triangular shaped, tungsten carbide
knives. The core recovered is continuously scribed by the three differentially spaced knives as it enters
the barrel. The reference scribe has a fixed, known relation to an orienting lug which appears on the compass
face of the survey instrument. The scribes virtually insure orientation of the core, especially in formations
with extensive fracturing.
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AVAILABLE CORE SIZES
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Core Barrel Size
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Hole Size
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Core Size
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NXB Wireline
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2.980 in.
75.69 mm
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1.875 in.
47.62 mm
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HXB in.Wireline
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3.650 in.
92.71 mm
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2.400 in.
60.96 mm
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International Directional Services
12030 East Riggs Road
Chandler, Arizona 85249
Tel: 480.824.7100
Fax: 480.883.2010
E-mail: idsinfo@idirectionaldrill.com
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