Double emulsion based drilling fluids

A method for the electrical logging a subterranean well comprising:

• placing into the subterranean well a double emulsion logging medium, said double emulsion logging medium comprising an invert emulsion with a microemulsion as the continuous phase, wherein said double emulsion logging medium comprises an oleaginous fluid, a polar organic solvent, an electrolytic salt, a first emulsifier capable of forming a microemulsion, a second emulsifier capable of forming an invert emulsion, and a carbon dioxide buffer,
• wherein the electrolytic salt is a quaternary amine salt having the formula:
• 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− is a counter anion;
• or combinations thereof;
• and wherein said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well, and
• wherein the carbon dioxide buffer is a functionally effective concentration of an amine of the following general formula:
• wherein, R1, R2, and R3 are hydrogen, alkyl groups with two to five carbon atoms, hydroxyalkyl groups with two to five carbon atoms, or combinations thereof, and electrically logging said subterranean well.

A method for the electrical logging a subterranean well comprising:

• placing into the subterranean well a double emulsion logging medium, said double emulsion logging medium comprising an invert emulsion with a microemulsion as the continuous phase, wherein said double emulsion logging medium comprises an oleaginous fluid, a polar organic solvent, an electrolytic salt, a first emulsifier capable of forming a microemulsion, a second emulsifier capable of forming an invert emulsion, and a carbon dioxide buffer,
• wherein the polar organic solvent is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, polypropylene glycol, polyethylene-propylene glycol propylene glycol n-butyl ether;
• dipropylene glycol n-butyl ether;
• tripropylene glycol n-butyl ether;
• tetrapropylene glycol n-butyl ether;
• pentapropylene glycol n-butyl ether;
• hexapropylene glycol n-butyl ether;
• heptapropylene glycol n-butyl ether, the analogous tert-butyl ethers and combinations thereof;
• wherein the electrolytic salt has the formula:
• wherein M is any suitable anion, preferably halogen, and R being an alkyl have from 10 to 14 carbon atoms;
• or combinations thereof;
• and wherein said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well, wherein the first emulsifier is dioctyl sulfosuccinate, and wherein the carbon dioxide buffer is a functionally effective concentration of an amine selected from the group consisting of:
• triethanolamine, diethanolamine, monoethanolamine, and triethylamine, and
• electrically logging said subterranean well.

A method for the electrical logging a subterranean well comprising:

• placing into the subterranean well a double emulsion logging medium, said double emulsion logging medium comprising an invert emulsion with a microemulsion as the continuous phase, wherein said double emulsion logging medium comprises an oleaginous fluid, a polar organic solvent, and an electrolytic salt, a first emulsifier capable of forming a microemulsion, a second emulsifier capable of forming an invert emulsion, and a carbon dioxide buffer,
• wherein the oleaginous fluid is selected from the group consisting of diesel, mineral oil, synthetic oil, vegetable oil, silicone oil, or combinations thereof;
• wherein the polar organic solvent is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, polypropylene glycol, polyethylene-propylene glycol propylene glycol n-butyl ether;
• dipropylene glycol n-butyl ether;
• tripropylene glycol n-butyl ether;
• tetrapropylene glycol n-butyl ether;
• pentapropylene glycol n-butyl ether;
• hexapropylene glycol n-butyl ether;
• heptapropylene glycol n-butyl ether, the analogous tert-butyl ethers and combinations thereof;
• wherein the electrolytic salt is isotridecyloxypropyldihydroxyethylmethylammonium chloride;
• and
• wherein the carbon dioxide buffer is triethanolamine;
• wherein the first emulsifier is dioctyl sulfosuccinate, and
• wherein said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well, and
• electrically logging said subterranean well.

A composition comprising:

• an invert emulsion with a microemulsion as the continuous phase, wherein said microemulsion comprises an oleaginous fluid, and an electrolytic salt, a polar organic solvent, and a carbon dioxide buffer, said composition also comprising a first emulsifier capable of forming a microemulsion and a second emulsifier capable of forming an invert emulsion, and
• wherein the polar organic solvent comprises a glycol, glycol ether or mixture thereof;
• wherein the electrolytic salt is a quaternary amine salt having the formula:
• 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− is a counter anion;
• or combinations thereof;
• and wherein said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well;
• wherein the first emulsifier is dioctyl sulfosuccinate, and wherein the carbon dioxide buffer is a functionally effective concentration of an amine of the following general formula:
• wherein, R1, R2, and R3 are hydrogen, alkyl groups with two to five carbon atoms, hydroxyalkyl groups with two to five carbon atoms, or combinations thereof.

A double emulsion medium useful in the electrical logging of a subterranean well, the double emulsion medium comprising:

• an invert emulsion with a microemulsion as the continuous phase, wherein said microemulsion comprises an oleaginous fluid, a polar organic solvent, a carbon dioxide buffer, and an electrolytic salt, said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well, said medium also comprising a first emulsifier capable of forming a microemulsion and a second emulsifier capable of forming an invert emulsion,
• wherein the polar organic solvent is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, polypropylene glycol, polyethylene-propylene glycol propylene glycol n-butyl ether;
• dipropylene glycol n-butyl ether;
• tripropylene glycol n-butyl ether;
• tetrapropylene glycol n-butyl ether;
• pentapropylene glycol n-butyl ether;
• hexapropylene glycol n-butyl ether;
• heptapropylene glycol n-butyl ether, the analogous tert-butyl ethers and combinations thereof;
• wherein the electrolytic salt has the formula:
• wherein M is any suitable anion, preferably halogen, and R being an alkyl having from 10 to 14 carbon atoms;
• or combinations thereof;
• and wherein said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well;
• wherein the first emulsifier is dioctyl sulfosuccinate, and
• wherein the carbon dioxide buffer is in a functionally effective concentration of an amine selected from the group consisting of:
• triethanolamine, diethanolamine, monoethanolamine, and triethylamine and said logging medium additionally containing an emulsifier capable of forming a microemulsion, and an emulsifier capable of forming an invert emulsion.

A conductive double emulsion medium useful in the electrical logging a subterranean well, said conductive double emulsion medium comprising:

• an invert emulsion with a microemulsion as the continuous phase, wherein said microemulsion comprises an oleaginous fluid, a polar organic solvent, a carbon dioxide buffer, and an electrolytic salt, said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well, said double emulsion medium also comprising a first emulsifier capable of forming a microemulsion and a second emulsifier capable of forming an invert emulsion,
• wherein the oleaginous fluid is selected from the group consisting of diesel, mineral oil, synthetic oil, vegetable oil, silicone oil, or combinations thereof;
• wherein the polar organic solvent is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, polypropylene glycol, polyethylene-propylene glycol propylene glycol n-butyl ether;
• dipropylene glycol n-butyl ether;
• tripropylene glycol n-butyl ether;
• tetrapropylene glycol n-butyl ether;
• pentapropylene glycol n-butyl ether;
• hexapropylene glycol n-butyl ether;
• heptapropylene glycol n-butyl ether, the analogous tert-butyl ethers and combinations thereof;
• wherein the electrolytic salt is isotridecyloxypropyldihydroxyethylmethylammonium chloride;
• and
• wherein the carbon dioxide buffer is triethanolamine;
• wherein the first emulsifier is dioctyl sulfosuccinate, and
• wherein said electrolytic salt being present in a concentration so as to permit the electrical logging of the subterranean well.