Electrically conductive non-aqueous wellbore fluids
First Claim
1. An electrically conductive invert emulsion wellbore fluid comprising:
- i) from about 0.2% to about 10% by volume of carbon black particles, and ii) one or more emulsifying surfactant(s) selected from the group consisting of;
nonionic emulsifiers of Hydrophilic-Lipophilic Balance (HLB) less than about 12, and anionic surfactants wherein the counter-ion is any of alkali metal, ammonium, or hydrogen ions, and wherein the wellbore fluid is substantially free of polyvalent metal cations and wherein the wellbore fluid has conductivity of at least 104 μ
S/m.
1 Assignment
0 Petitions
Accused Products
Abstract
A wellbore fluid having a non-aqueous continuous liquid phase that exhibits an electrical conductivity increased by a factor in order of 104 to 107 compared to conventional invert emulsion comprises from about 0.2% to about 10% by volume of carbon black particles and one or more emulsifying surfactant(s) selected from the class including nonionic emulsifiers of Hydrophilic-Lipophilic Balance (HLB) less than about 12, and anionic surfactants wherein the counter-ion (cation) is any of alkali metal, ammonium, or hydrogen ions. This wellbore fluid can be used for drilling or completing a well and can be used for providing enhanced information from electrical logging tools, measurement while drilling, logging while drilling, geosteering and the like.
-
Citations
12 Claims
-
1. An electrically conductive invert emulsion wellbore fluid comprising:
-
i) from about 0.2% to about 10% by volume of carbon black particles, and ii) one or more emulsifying surfactant(s) selected from the group consisting of;
nonionic emulsifiers of Hydrophilic-Lipophilic Balance (HLB) less than about 12, and anionic surfactants wherein the counter-ion is any of alkali metal, ammonium, or hydrogen ions, andwherein the wellbore fluid is substantially free of polyvalent metal cations and wherein the wellbore fluid has conductivity of at least 104 μ
S/m.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification