SGMA performance, design. Conclusion. Proper reservoir choice, fluid design keys to SGMA success

Journal Article · Mon Oct 23 04:00:00 EDT 1978 · Oil Gas J.; (United States)

OSTI ID:6920525

Gates, H R; Lybarger, J H

Self generating mud acid (SGMA) fluids are composed of an ammonium fluoride salt solution and an acid generating material such as methyl formate. Although several SGMA systems exist which can be used over the bottom-hole temperature range from 130/sup 0/ to 270/sup 0/F, the methyl formate type is the system reported on in this work. In this case, the methyl formate hydrolizes to formic acid and methyl alcohol at a rate which is dependent upon time and temperature. As the formic acid forms, it combines with the ammonium fluoride to produce hydrofluoric (HF) acid. Although HF acid concentrations up to about 3.5% by wt can be generated, the conventional system generates about 2%. The methyl formate system has been utilized mainly in a bottom-hole temperature range of from 130/sup 0/ to 190/sup 0/F. At reservoir temperatures below about 130/sup 0/F, HF generation becomes too slow for practical use. Also with this system, depending of course upon the pump rate, temperatures above 190/sup 0/F can cause a loss of in-depth HF capacity due to premature generation.

• Research Organization: Shell Oil Co
• OSTI ID: 6920525
• Journal Information: Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 76:43; ISSN OIGJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACIDIZATION
AMMONIUM COMPOUNDS
AMMONIUM FLUORIDES
CHEMICAL COMPOSITION
ENHANCED RECOVERY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
NATURAL GAS WELLS
OIL WELLS
RECOVERY
RESERVOIR PRESSURE
RESERVOIR TEMPERATURE
WELL PRESSURE
WELL TEMPERATURE
WELLS