Abstract: An invert oil-based mud (OBM) includes an oleaginous continuous phase, an aqueous internal phase, and an emulsifier that has two hydrophilic head groups and a hydrophobic tail group. A method of using an invert oil-based mud (OBM) in a wellbore is provided. The method includes introducing the invert OBM, which includes an oleaginous continuous phase, an aqueous internal phase, and an emulsifier with two hydrophilic head groups and a hydrophobic tail group into the wellbore. A method of preparing an invert oil-based mud (OBM) is also provided. The method includes mixing an emulsifier comprising two hydrophilic head groups and a hydrophobic tail group with an oleaginous phase and an aqueous phase.

Abstract: A waste vegetable-oil based emulsifier for use as drilling mud primary emulsifier is described. A first emulsifier is prepared from an alkyl ester of waste vegetable oil. The waste vegetable oil is vegetable oil which has been used for a process prior to preparing the first emulsifier. A quantity of the first emulsifier is added to an oil-based drilling fluid. A quantity of an activating agent is added to the oil-based drilling fluid. The activating agent is configured to activate the emulsifier to stabilize an emulsion. A quantity of viscosifier is added to the oil-based drilling fluid. A quantity of a second emulsifier is added to the oil-based drilling fluid. A quantity of weigh-up material is added to the oil-based drilling fluid. The resulting oil-based drilling fluid is used in a wellbore drilling operation to drill a wellbore in a subterranean zone.

Abstract: A method of making an invert oil-based mud (OBM), a composition for an invert OBM, and a method of using an invert OBM are provided. The invert OBM includes an oil-based fluid, an emulsifier comprising a calcium salt of an alkyl esterified fatty acids from a vegetable oil, an emulsion activating agent, and a water-based fluid.

Abstract: A waste vegetable-oil based emulsifier for use as drilling mud primary emulsifier is described. A first emulsifier is prepared from an alkyl ester of waste vegetable oil. The waste vegetable oil is vegetable oil which has been used for a process prior to preparing the first emulsifier. A quantity of the first emulsifier is added to an oil-based drilling fluid. A quantity of an activating agent is added to the oil-based drilling fluid. The activating agent is configured to activate the emulsifier to stabilize an emulsion. A quantity of viscosifier is added to the oil-based drilling fluid. A quantity of a second emulsifier is added to the oil-based drilling fluid. A quantity of weigh-up material is added to the oil-based drilling fluid. The resulting oil-based drilling fluid is used in a wellbore drilling operation to drill a wellbore in a subterranean zone.

Abstract: A waste vegetable-oil based emulsifier for use as drilling mud primary emulsifier is described. A first emulsifier is prepared from an alkyl ester of waste vegetable oil. The waste vegetable oil is vegetable oil which has been used for a process prior to preparing the first emulsifier. A quantity of the first emulsifier is added to an oil-based drilling fluid. A quantity of an activating agent is added to the oil-based drilling fluid. The activating agent is configured to activate the emulsifier to stabilize an emulsion. A quantity of viscosifier is added to the oil-based drilling fluid. A quantity of a second emulsifier is added to the oil-based drilling fluid. A quantity of weigh-up material is added to the oil-based drilling fluid. The resulting oil-based drilling fluid is used in a wellbore drilling operation to drill a wellbore in a subterranean zone.

Abstract: A waste vegetable-oil based emulsifier for use as drilling mud primary emulsifier is described. A first emulsifier is prepared from an alkyl ester of waste vegetable oil. The waste vegetable oil is vegetable oil which has been used for a process prior to preparing the first emulsifier. A quantity of the first emulsifier is added to an oil-based drilling fluid. A quantity of an activating agent is added to the oil-based drilling fluid. The activating agent is configured to activate the emulsifier to stabilize an emulsion. A quantity of viscosifier is added to the oil-based drilling fluid. A quantity of a second emulsifier is added to the oil-based drilling fluid. A quantity of weigh-up material is added to the oil-based drilling fluid. The resulting oil-based drilling fluid is used in a wellbore drilling operation to drill a wellbore in a subterranean zone.