Retrievable resistivity tool for measurement while drilling

Details Retrievable resistivity tool for measurement while drilling Retrievable resistivity tool for measurement while drilling

G - Physics

01

V

G01V 3/20 (2006.01) E21B 47/026 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2321984

A retrievable resistivity logging system is provided for obtaining directional resistivity information while drilling. The logging system comprises passive transmitter (36) and receiver electrodes (54) built into subs that are incorporated into the drillstring, and a retrievable instrument cartridge (22) that comprises spring loaded contacts (44) that engage contact surfaces in the subs to connect the electrodes (54, 36) to the cartridge (22). A plurality of receiver electrodes may be employed to provide simultaneous directional resistivity information from several directions around the wellbore, which may be used for detecting the presence of a nearby contrasting formation.

L'invention concerne un système récupérable de diagraphie de la résistivité, servant à obtenir des informations concernant la résistivité directionnelle lors d'un forage. Ledit système comprend des électrodes d'émission (36) et de réception (54) passives construites dans des raccords de réduction intégrés au train de tiges de forage, et une cartouche (22) d'instrument récupérable qui présente des contacts (44) à ressort qui introduisent les surfaces de contact dans les raccords de réduction afin de connecter les électrodes (54, 36) à la cartouche (22). On peut utiliser plusieurs électrodes de réception pour obtenir des informations simultanées sur la résistivité directionnelle provenant de plusieurs points autour du puits de forage. Ces informations peuvent servir à détecter la présence d'une formation différente proche.

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