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US 12,742,024 B2Granted
Branched polyvinyl alcohol as a shale stabilizer for drilling fluid applications
AssigneeHalliburton Energy Services, Inc.
InventorsV. Ramireddy Devarapalli, Sunita S. Kadam, Rahul Patil, William Cecil Pearl, Jr.
Life of this patent
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Abstract
A method may include: introducing a water-based drilling fluid comprising an aqueous base fluid and a branched polyvinyl alcohol shale stabilizer into a drill string; extending a wellbore using the drill string through a subterranean formation comprising a shale; and allowing the branched polyvinyl alcohol shale stabilizer to interact with the shale to at least partially inhibit the shale.
Claims20
A method comprising:
- combining a branched polyvinyl alcohol shale stabilizer with an aqueous base fluid to produce a water-based drilling fluid, wherein the branched polyvinyl alcohol shale stabilizer is a solid powder, and wherein the branched polyvinyl alcohol shale stabilizer is present in the water-based drilling fluid in an amount of about 0.1 pounds per barrel (ppb) (0.29 kg/m3) to about 10 ppb (28.5 kg/m3);
- introducing the water-based drilling fluid comprising the aqueous base fluid and the branched polyvinyl alcohol shale stabilizer into a drill string;
- extending a wellbore using the drill string through a subterranean formation comprising a shale;
- and
- allowing the branched polyvinyl alcohol shale stabilizer to interact with the shale to at least partially inhibit the shale.
2 more elements
Dependencies are inferred from the claim text.