Thermally stable surfactants for oil based drilling fluids
AssigneesSaudi Arabian Oil Company, Durham University, M-I Drilling Fluids UK Limited
InventorsMusarrat Halima Mohammed, Andrew Whiting, Hugh Christopher Greenwell, Mona Al Batal, John Adrian Hall, Gasan Selman Alabedi, Michael Hayward Hodder
Life of this patent
Estimating the term…
Abstract
Embodiments for an oil-based drilling fluid and methods of making the oil-based drilling fluid are provided, in which the oil-base drilling fluid comprising: an oil phase; an aqueous phase; at least one surfactant, in which at least one surfactant comprises a carboxylic acid having 10 or more glycol repeating units; and optionally, at least one emulsifying agent.
Claims20
A oil-based drilling fluid comprising:
- an oil phase;
- an aqueous phase;
- at least one wetting agent, in which at least one wetting agent comprises a polyethylene glycol carboxylic acid surfactant having 10 or more than 10 glycol repeating units;
- and
- optionally, at least one emulsifying agent.
The oil-based drilling fluid according to 2, in which x is from 21 to 200.
A method for making an oil-based drilling fluid comprising:
- mixing a base oil, at least one emulsifier, and at least one wetting agent to form a first mixture, the wetting agent comprises a polyethylene glycol carboxylic acid surfactant having 10 or more than 10 glycol repeating units to form a base oil mixture;
- optionally, mixing at least one rheology modifier, a viscosifier, and an alkalinity control agent into the base oil mixture
- optionally, mixing at least one fluid-loss control additive into the base oil mixture;
- mixing a brine solution into the base oil to form a second mixture;
- and
- mixing a weighting additive into the second mixture to form the high pressure high temperature oil-base drilling fluid.
The method of claim 15, in which x is from 21 to 200.
A method for drilling in a subterranean formation, the method comprising:
- providing an oil-based drilling fluid composition;
- and
- introducing the oil-based drilling fluid composition into a wellbore;
- wherein the oil-based drilling fluid composition comprises:
- an oil phase;
- an aqueous phase;
- at least one wetting agent, in which at least one wetting agent comprises a polyethylene glycol carboxylic acid surfactant having 10 or more than 10 glycol repeating units;
- and
- optionally, at least one emulsifying agent.
Dependencies are inferred from the claim text.