Self-generating mud acid (SGMA)

Conference · Tue Jan 01 04:00:00 EST 1974 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:6636333

Templeton, C C; Richardson, E A; Karnes, G T; Lybarger, J H

Productivity-decline characteristics for typical Gulf Coast wells have been interpreted to indicate severe well-bore impairment resulting from migration of clay or fines toward the borehole. This damage probably occurs to some depth in the formation (perhaps greater than 1 to 2 ft). The HF fraction of a mud acid stimulation treatment spends quite rapidly when it contacts clay and fine siliceous material. Thus, a normal mud acid treatment only affects the formation in the immediate vicinity of the well bore and does not remove in-depth damage. This paper describes SGMA, an in situ HF generation system (Self-Generating Mud Acid) developed to provide an in-depth stimulation technique. This method involves pumping into the formation an aqueous solution of ammonium fluoride and an organic ester (say, methyl formate); with time, the ester hydrolyzes to produce an organic acid (e.g., formic acid). The organic acid is almost instantly converted to HF, which rapidly dissolves clay or siliceous fines present in the pores. The method may be used over a bottom-hole temperature range from 100/sup 0/ to 225/sup 0/F and HF solutions up to a concentration of 3.5% can be generated.

• Research Organization: Shell Development Co
• OSTI ID: 6636333
• Report Number(s): CONF-7410175-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE-5153
• 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
ADDITIVES
AMMONIUM COMPOUNDS
AMMONIUM FLUORIDES
ENHANCED RECOVERY
ESTERS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
RECOVERY
STIMULATION
TEMPERATURE EFFECTS
WELL STIMULATION
WELLS