Measuring and testing – Borehole or drilling – Downhole test
Patent
1978-11-20
1980-11-04
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
33313, E21B 47024
Patent
active
042312523
ABSTRACT:
This invention relates to a device for providing data for determining a non-horizontal change from one direction to another of a reference axis fixedly associated with a body.
The apparatus uses gravity sensor devices, such as accelerometers, to provide data for determining change in both azimuth and slant angle. In some embodiments that data may be derived from the signal of a single accelerometer.
Some embodiments of the invention are probes for surveying in geological boreholes. In some of such embodiments a single gravity sensor is fixed to a mass which is mounted for free rotation.
Drive elements are provided whereby the mass may be rotated and then allowed to rotate undriven.
Thus the direction in which the sensor is responsive to the gravity vector is, due to inertia of the mass, independent from random axial rotation of the probe. A time reference is used to measure axial rotation with respect to a vertical plane of the sensor from a sensor signal providing data from which both azimuth angle and slant angle changes may be calculated.
In other embodiments, gravity sensors are fixedly mounted within a probe and the probe is restrained by tracking elements from random axial rotation. Statistical methods may thus be applied to sensor signal data to correct for dislocations in an azimuth curve such as occur at borehole liner interconnection points.
REFERENCES:
patent: 3545266 (1970-12-01), Wilson
patent: 3587176 (1971-06-01), Schnerb
patent: 3691363 (1972-09-01), Armistead
patent: 4021774 (1977-05-01), Asmundsson et al.
Mount ISA Mines Limited
Myracle Jerry W.
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