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Metal Working

Borehole-tool

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Borehole tool

Details

Inventors: Powell, Steven W.; Stockton, James G.;
Assignee: NL Sperry Sun, Inc. (Sugar Land, TX)
Primary Examiner: Martin, Jr.; William D.
Assistant Examiner:
Attorney, Agent or Firm: Johnson, Jr.; W. E., Traut; D. L.

A surface activated multishot survey tool utilizes a dampened magnetic compass movably positioned within a probe to determine the direction of a borehole. Lamps in the probe are operable to light the face of the compass. A lens projects the image of the compass onto a movable film strip. An electrical cable is connected to the probe and is used to pass a current to the lamps and provide selective operation of the tool from the surface of the borehole. Electrical connectors are provided at each end of the probe so that the probe may be inverted within the borehole to accommodate surveys in which the angle of the borehole is greater than that at which the compass will operate without error. Because connectors are located at both ends of the probe, electrical current passes around the magnetic compass, thus creating a magnetic field about the compass. An alternating current is used to operate the tool, with the rate of change in direction of the current being faster than the movement response time of the dampened compass to the changing magnetic field generated by the current.

DETAILED DESCRIPTION With this and other objects in view, the present invention utilizes in a borehole instrument, an instrument housing having electrical connectors at both ends thereof and a magnetically responsive member in the housing for detecting direction.
Some method of dampening the magnetically responsive member is employed to slow the response time of the magnetically responsive member in changing its state due to the effect of an alternating current in its physical proximity.
An alternating current is provided from the surface to a photographic recording system in the housing to actuate the recording system when it is desired to record the position of the tool within a borehole.
The rate of change of alternations in the current is chosen such that it exceeds the rate at which the magnetically responsive member is affected by the alternating current, thereby providing a zero average magnetic field due to the current alternations, leaving the earth's magnetic field as the remaining net magnetic effect on the magnetically responsive member.

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