Patent ID: 11933119
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Civil engineering (Other fields)
Classification: CPC E  C | IPC C  E

Claim 0:
1. A method comprising:
circulating an oil-based drilling fluid though a drill string to extend a wellbore through a subterranean formation, wherein the oil-based drilling fluid comprises an invert emulsion;
separating at least a portion of the oil-based drilling fluid from the circulated oil-based drilling fluid to form a separated portion of oil-based drilling fluid;
mixing a metal salt and a metal oxide into the separated portion of the oil-based drilling fluid at a surface location to form a mixture and shearing the mixture at the surface location to form a chemical sealing pill, wherein the chemical sealing pill comprises the portion of the oil-based drilling fluid, the metal salt, and the metal oxide;
after mixing and shearing, introducing the chemical sealing pill into the drill string as a single mixture and flowing the chemical sealing pill into a lost circulation zone in the subterranean formation;
allowing at least a portion of the chemical sealing pill to set in the lost circulation zone to form a set plug, wherein the set plug seals the lost circulation zone and reduces loss of fluid into the lost circulation zone from subsequently introduced fluids; and
preventing loss of fluid into the lost circulation zone from subsequently introduced fluids with the set plug.