Well twinning techniques in borehole surveying

G - Physics – 01 – V

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Details

G01V 3/26 (2006.01) E21B 47/02 (2006.01) E21B 47/022 (2012.01) G01V 3/38 (2006.01)

Patent

CA 2470305

A method for surveying a borehole is provided. The method includes providing a tool having a magnetic field measurement device disposed thereon and positioning the tool in a borehole. Magnetic interference vectors are determined at at least two positions in the borehole by comparing the measured magnetic fields at those positions with a known magnetic field of the earth. The magnetic interference vectors indicate a direction to a target subterranean structure. Various embodiments of the invention compare the directions to the target subterranean structure with a historical survey thereof, so as to determine a distance between the borehole and the subterranean structure and an azimuth of the borehole. The surveying methodology of this invention may advantageously improve borehole surveying data obtained, for example, in relief well and/or well twinning drilling applications.

Une méthode de sondage de trou de forage est présentée. La méthode comprend la fourniture d'un outil muni d'un dispositif de mesure de champ magnétique et le positionnement du dispositif dans un trou de forage. Des vecteurs d'interférence magnétique sont déterminés à au moins deux positions dans le trou de forage par comparaison des champs magnétiques mesurés à ces positions avec un champ magnétique connu de la Terre. Les vecteurs d'interférence magnétique indiquent une direction vers une structure souterraine cible. Divers modes de réalisation de l'invention comparent les directions vers la structure souterraine cible selon les sondages antérieurs, de manière à déterminer une distance entre le trou de forage et la structure souterraine et un azimut du trou de forage. La méthodologie de sondage de la présente invention peut permettre d'améliorer avantageusement les données de sondage obtenues, par exemple dans des applications de forage de puits de décompression et/ou de jumelage de puits.

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