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US 8,474,532 B2Granted
Invert silicate fluids for wellbore strengthening
AssigneeM-1 Drilling Fluids U.K. Limited
InventorDavid Antony Ballard
Life of this patent
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Abstract
A wellbore fluid that includes an oleaginous continuous phase; a non-oleaginous discontinuous phase comprising a water-soluble silicate therein; and an emulsifier to stabilize the non-oleaginous phase dispersed in the oleaginous phase is disclosed. A setting agent, including organic or inorganic setting agent may optionally be included to trigger gelation or precipitation of the silicate downhole.
Claims12
A wellbore fluid, comprising:
- an oleaginous continuous phase comprising at least one hydrolysable ester;
- a non-oleaginous discontinuous phase comprising a water-soluble silicate therein;
- and
- an emulsifier to stabilize the non-oleaginous phase dispersed in the oleaginous phase.
1 more element
A method of treating an earth formation, comprising:
- emplacing an invert emulsion wellbore fluid comprising:
- an oleaginous continuous phase;
- a non-oleaginous discontinuous phase comprising a water-soluble silicate therein;
- an emulsifier to stabilize the non-oleaginous phase dispersed in the oleaginous phase;
- and
- an organic setting agent;
- and
- lowering the pH of the wellbore fluid to cause gelation of the silicate.
5 more elements
A method of treating an earth formation, comprising:
- emplacing an invert emulsion wellbore fluid comprising:
- an oleaginous continuous phase comprising at least one ester;
- a non-oleaginous discontinuous phase comprising a water-soluble silicate therein;
- and
- an emulsifier to stabilize the non-oleaginous phase dispersed in the oleaginous phase;
- and
- lowering the pH of the wellbore fluid to cause gellation of the silicate.
4 more elements
A method of treating an earth formation, comprising:
- emplacing an invert emulsion wellbore fluid comprising:
- an oleaginous continuous phase;
- a non-oleaginous discontinuous phase comprising a water-soluble silicate therein;
- and
- an emulsifier to stabilize the non-oleaginous phase dispersed in the oleaginous phase;
- and
- lowering the pH of the wellbore fluid to cause gelation of the silicate, wherein lowering the pH of the wellbore fluid comprises allowing the wellbore fluid to come into contact with a formation water.
4 more elements
Dependencies are inferred from the claim text.