Well completion and workover fluid having low fluid loss

Patent · Tue Mar 11 00:00:00 EST 1980

OSTI ID:5538709

Fischer, P W; Gallus, J P; Pye, D S

A description is given of a non-damaging variable-density low fluid loss well completion and workover fluid composition which is a dispersion of finely divided slowly oil-soluble, water-insoluble solid particulate matter in a thickened aqueous salt solution. The fluid composition is a mixture of an aqueous solution of a watersoluble inorganic salt, a first high softening point resin fluid loss control additive, a microemulsion fluid loss control additive, and, optionally, a water-dispersible thickening agent and/or a ph control agent. The microemulsion contains water, an oil-soluble surface active agent, a water-dispersible surface active agent, and, as a fluid loss control additive, a mixture of a wax and a second low softening point resin. The microemulsion also optionally contains an additive to prevent phase separation and/or a bactericide. Also disclosed is a method for using this composition in various well drilling, completion and treating operations.

• Assignee: Union Oil Co of California
• Patent Number(s): US 4192753
• OSTI ID: 5538709
• Resource Relation: Patent File Date: Filed date 7 Mar 1978; Other Information: PAT-APPL-884128
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
NATURAL GAS WELLS
WELL COMPLETION
OIL WELLS
DRILLING FLUIDS
ADDITIVES
AQUEOUS SOLUTIONS
INORGANIC COMPOUNDS
LOSSES
MICROEMULSIONS
PARTICLE SIZE
PH VALUE
PHASE STABILITY
RESINS
SURFACTANTS
COLLOIDS
DISPERSIONS
EMULSIONS
FLUIDS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
SIZE
SOLUTIONS
STABILITY
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing