Patent Number: 6,308,788

Title: Conductive medium for openhole logging and logging while drilling

Abstract: A method of electrically logging subterranean wells using a conductive fluid in which the conductive fluid includes a miscible combination of an oleaginous fluid, a polar organic solvent, and an electrolytic salt. The electrolytic salt or brine of the salt is present in a concentration sufficient to permit the electrical logging of the subterranean well. The medium may further include gelling agent, weight material, surfactant, or corrosion inhibitors. The polar organic solvent may preferably be a oil soluble glycol or glycol ether such as ethylene glycol, diethylene glycol, propylene glycol, polypropylene glycol, and the like. The electrolytic salt or brine is preferably a quaternary amine salt having the formula: ##STR1## wherein R is an alkyl having 8 to 18 carbon atoms, R' is 2 to 6 carbon atoms alkyl group, B is hydrogen, oxyalkyl having 1 to 4 carbon atoms or alkyl having 1 to 4 carbon atoms, A is hydrogen or alkyl with 1 to 4 carbon atoms, x+y=1 to 15, z is 0 to 3, and M.sup.- is a counter anion; or combinations thereof.

Inventors: Patel; Arvind D. (Houston, TX), Bell; Rejinald J. (Houston, TX), Hoxha; Burhan (Houston, TX)

Assignee: M-I LLC

International Classification: C09K 8/32 (20060101); C09K 8/02 (20060101); E21B 17/00 (20060101); E21B 47/12 (20060101); E21B 47/00 (20060101); G01V 3/20 (20060101); G01V 3/18 (20060101); C09K 007/06 (); E21B 021/00 (); E21B 049/00 ()

Expiration Date: 10/30/2018