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US 12,371,604 B1Granted
Drilling fluid additives for high-density reservoir drilling fluids
AssigneeHalliburton Energy Services, Inc.
InventorsPreston Andrew May, Hui Zhou, Jay Deville
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Abstract
Drilling fluids for drilling a wellbore. An example drilling fluid includes an aqueous base fluid, a first fluid loss control additive that comprises a cross-linked polymer comprising N-vinylpyrrolidone as a monomer, and a second fluid loss control additive that comprises a cloud point glycol.
Claims20
A method for drilling a wellbore in a subterranean formation, the method comprising:
- providing a drilling fluid comprising:
- an aqueous base fluid;
- a first fluid loss control additive that comprises a cross-linked polymer comprising N-vinylpyrrolidone as a monomer;
- and
- a second fluid loss control additive that comprises a cloud point glycol;
- drilling a wellbore through at least a portion of a subterranean formation with the drilling fluid, whereby a filter cake is formed;
- and
- introducing a brine into the wellbore after the drilling fluid is introduced into the wellbore, wherein the brine comprises zinc,
- wherein the drilling fluid comprises the second fluid loss control additive in a concentration of about 0.1% to about 10% w/v of the drilling fluid, such that the filter cake formed during the drilling exhibits enhanced filtration control capability in the presence of the subsequently introduced zinc-containing brine than a filter cake produced during drilling with an otherwise identical drilling fluid absent the second fluid loss control additive.
6 more elements
A system for drilling a wellbore, the system comprising:
- mixing equipment configured to mix a drilling fluid comprising:
- an aqueous base fluid;
- a first fluid loss control additive that comprises a cross-linked polymer comprising N-vinylpyrrolidone as a monomer;
- and
- a second fluid loss control additive that comprises a cloud point glycol;
- and
- pumping equipment configured to pump the drilling fluid in the wellbore,
- whereby a filter cake is formed, and subsequently introduce a brine into the wellbore,
- wherein the brine comprises zinc,
- wherein the drilling fluid comprises the second fluid loss control additive in a concentration of about 0.1% to about 10% w/v of the drilling fluid, such that the filter cake formed during the drilling exhibits enhanced filtration control capability in the presence of the subsequently introduced zinc-containing brine than a filter cake produced during drilling with an otherwise identical drilling fluid absent the second fluid loss control additive.
7 more elements
Dependencies are inferred from the claim text.