Encapsulated lime as a lost circulation additive for aqueous drilling fluids

Patent · Tue Sep 30 00:00:00 EDT 1986

OSTI ID:5061577

Walker, C O

This patent describes drilling fluid additive for reducing lost circulation of aqueous drilling fluids in a borehole penetrating an underground formation, comprising: lime encapsulated by an organic wax having a melting point below the temperature of the underground formation and above the bottom hole circulating temperature of the drilling fluid within the borehold. The encapsulation prevents the lime from reacting with clays in the borehole and drilling fluid until it is desired to melt the organic wax encapsulation.

• Assignee: Texaco, Inc., White Plains, NY
• Patent Number(s): US 4614599
• OSTI ID: 5061577
• Resource Relation: Patent File Date: Filed date 01 Apr 1985
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
DRILLING FLUIDS
ADDITIVES
LOST CIRCULATION
WELL DRILLING
AQUEOUS SOLUTIONS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CLAYS
MELTING POINTS
NATURAL GAS WELLS
OIL WELLS
WAXES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
DISPERSIONS
DRILLING
FLUIDS
HYDROGEN COMPOUNDS
HYDROXIDES
MIXTURES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing