Acid-soluble drilling, completion and workover fluids

Conference · Tue Jan 01 04:00:00 EST 1974 · Proc. Annu. Southwest. Pet. Short Course; (United States)

OSTI ID:6985963

Harrison, G; Hartfiel, A H; Darley, H C.H.

Acid-soluble oil-base fluids should be used whenever there is a chance of impairment by aqueous filtrates as well as by solids impairment, or when low-density fluids are required for depleted reservoirs. One such fluid, known as chalk emulsion, was developed in the research laboratories of the Shell Development Co. This is an invert emulsion with the unusual feature being that the emulsifying agent is finely divided chalk. The chalk is made partially oil-wet so that the particles are adsorbed as a skin around the water droplets, preventing their coalescence. However, when contacted by acid, the skin is dissolved and the emulsion breaks at once to clear oil and water. Another acid-soluble oil-base emulsion is available which can be used in wells having bottom hole temperatures up to 350/sup 0/F. The emulsifier is in the form of a dry powder. Rheology is controlled by the concentration of emulsifier and the oil/water ratio. In certain cases, where density is increased with calcium carbonates, it is necessary to add a dispersant.

• Research Organization: Brinadd Co.
• OSTI ID: 6985963
• Report Number(s): CONF-7404144-
• Conference Information: Journal Name: Proc. Annu. Southwest. Pet. Short Course; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACIDIZATION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMICAL COMPOSITION
COLLOIDS
DISPERSIONS
DRILLING
DRILLING FLUIDS
EMULSIONS
FLUIDS
OIL WELLS
OXYGEN COMPOUNDS
RHEOLOGY
WELL DRILLING
WELLS