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US 11,499,085 B1Granted
Composition and method for controlling lost circulation
AssigneeBaker Hughes Oilfield Operations LLC
InventorsShiv Shankar Sangaru, Pranjal Sarmah
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Abstract
A method of controlling lost circulation includes introducing into a wellbore a lost circulation fluid comprising: an external oil phase, an internal aqueous phase, an emulsifier, a wetting agent, a magnesia sealant, and a; retarder; contacting the lost circulation fluid with a lost circulation zone; and forming a plug adjacent the lost circulation zone by reacting the magnesia sealant with water at a wellbore temperature, thereby reducing fluid loss into the lost circulation zone.
Claims19
A method of controlling lost circulation, the method comprising:
- introducing into a wellbore a lost circulation fluid comprising:
- an external oil phase,
- an internal aqueous phase,
- an emulsifier,
- a wetting agent,
- a magnesia sealant, and
- a retarder;
- contacting the lost circulation fluid with a lost circulation zone;
- and
- forming a plug adjacent the lost circulation zone by reacting the magnesia sealant with water at a wellbore temperature, thereby reducing fluid loss into the lost circulation zone.
7 more elements
A lost circulation fluid comprising:
- an external oil phase,
- an internal aqueous phase,
- an emulsifier,
- a wetting agent,
- a magnesia sealant comprising magnesia, magnesium sulfate, and dolomite, and
- a retarder,
- wherein the lost circulation fluid is an invert emulsion, and
- the external oil phase is a continuous phase.
5 more elements
Dependencies are inferred from the claim text.