GYROSCOPIC DEVIATION

SPECIFICATIONS

System requirement GAA logger20
Diameter 42mm
Length - 1.7m
Weight - 9kg
Logging speed 6m/min
Max: Temperature 700C
Max: Pressure - 3000psi
Power Supply - 28 VDC
Azimuth Range 0 to 3600 +/- 10
Inclination Range 0 to 300 +/- 0.50

LOG PARAMETERS

Depth (M or ft)
Inclination (0)
Azimuth (0)

APPLICATIONS

Directional surveys can be used for several different reasons;
· in water wells they are normally run to insure that the production pumping equipment will be properly aligned.
· Boreholes drilled in harder fractured material can be quite deviated depending on the dip and strike of the formations.
· In mining and mineral exploration borings may intentionally be drilled at some angle to intersect the pay zone at right angles for accurate ore analysis.
· Oil and gas wells may be highly angled from a multiple completion site such as an offshore platform and whipstocked out in a known direction and angle to intersect from the well head.
All of these industries use and benefit from the use of accurate directional survey results.

There are two distinct types of directional survey equipment, Gyroscopic and Magnetic. Each will give the same results but are used in different conditions. Each of these two types can be either recorded on photographic film or surface readout equipment. The object is to record for further analysis the measured depth, the direction the bottom of the tool is in relation to the top of the tool and the angle or inclination of the hole. The raw survey data is used to compute the borehole path from the top of the
well to the bottom. After computation the survey data sheet contains the three dimensional data to be plotted and recorded as digital data.
The Gyroscope is good for through drill rod surveys or where ground is suspected to be magnetic, where these conditions do not occur it is usually cheaper to run the magnetic deviation tools, which will give the same results in non-magnetic situations.

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