CPC E21B 49/00 (2013.01) [E21B 7/00 (2013.01); E21B 21/003 (2013.01); E21B 33/138 (2013.01); E21B 47/12 (2013.01)] | 19 Claims |
1. A method of performing a wellbore operation comprising:
circulating an oil-based wellbore fluid having a conductive material therein within a wellbore, the oil-based wellbore fluid having a conductivity of at most 0.02 S/m when measured at 20 kHz, wherein the conductive material is a carbon black having volatile content, wherein the volatile content is below about 1% by weight of the carbon black; and
forming a filtercake having a conductivity at least two orders of magnitude higher than the oil-based wellbore fluid on at least a portion of a wall of the wellbore; wherein the carbon black has a pore volume of at least about 200 cm3 DBP/100 g carbon black and up to about 500 cm3 DBP/100 g carbon black; wherein the carbon black is present in the wellbore fluid in an amount of 1 to 30 pounds per barrel; wherein the oil-based wellbore fluid has a plastic viscosity of about 15-70 cP and a yield point of less than about 35 1b/100 ft2; wherein a circumscribing sphere encompassing an aggregate of the carbon black has a diameter of up to 3 micrometers;
wherein the oil-based fluid is an invert emulsion comprising an oleaginous and a non-oleaginous fluid; wherein the oleaginous fluid is at least 30 percent by volume of the total oil-based fluid, and wherein the non-oleaginous fluid comprises a 25 wt. % calcium chloride brine solution.
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