Guiding of a tool along a subterranean path

Details Guiding of a tool along a subterranean path Guiding of a tool along a subterranean path

E - Fixed Constructions

21

B

E21B 44/00 (2006.01) E21B 47/022 (2006.01) E21B 47/12 (2006.01) G01V 3/08 (2006.01)

Patent

CA 2041622

S P E C I F I C A T I O N IMPROVEMENTS IN OR RELATING TO GUIDING OF A TOOL ALONG A SUBTERRANEAN PATH ABSTRACT OF THE DISCLOSURE In order to guide a tool along a subterranean path close to the surface, as is required to cross a river for example, the tool includes a magnetic detector and a transmitter loop is positioned as a reference for the tool at the surface. In one measurement phase, a direct current is caused to flow in one direction in the loop and the resulting magnetic field in the vicinity of the tool is detected by means of the magnetic detector. In another measurement phase, a direct current is caused to flow in the opposite direction in the loop and the resulting magnetic field in the vicinity of the tool is detected by means of the magnetic detector. Processing techniques are used to determine positional information using the detected magnetic field values and tool orientation data, and steering of the tool may be effected as required on the basis of such positional information. The technique permits guiding of a tool along a subterranean path with high accuracy and without requiring non-standard detection and processing circuitry.

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