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The principle in surveying
with the core orientation instrument is to obtain measurements that
will allow core samples to be oriented to their original inclination and toolface positions prior to being removed from the ground.
A separate survey will have to be performed in applications requiring
azimuth measurement.
A
core orientation survey typically does not have to be performed each
time the core barrel is retrieved. The toolface (also known as
roll) line on the core sample can be extended onto multiple pieces of
core as long as each pieces of core can be fitted to the next piece of
core. A core orientation survey can be performed periodically as
required during the drilling program. A core orientation survey will
have to be performed if the core samples cannot be accurately fitting
to each other in order to extend the toolface line. There are many
causes for this such as drilling through a fault line.
The
survey train can be easily customized to suit different applications
and connections such as replacing the spearhead with a cable
swivel. The
instrument can be threaded directly into equipment which has a
1" 16TPI thread and can be used with other equipment with a
different thread configuration by adding thread adapters. Standard and
custom thread adapters are available.
There
are different core orientation marking
systems available. Depending on your application and borehole characteristics,
the most ideal system can be selected.
This method is capable of surveying holes drilled at any angle since standard procedures used in drilling
can be used to place the survey
train at the survey site.
Information
to provide when requesting a quotation:
If
available, please includes details about your surveying application so
we can provide a detailed quotation and/or additional information.
Common details to include are:
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What
is the core size(s)?
-
What
is the direction (upward, downward, horizontal, etc) of the hole?
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What
is the length of the hole?
-
Is
the hole water filled?
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