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On the acidization of sandstone

Thesis/Dissertation ·
OSTI ID:5115930
Although the acidization process has been used for many years as a means of increasing the productivity of petroleum wells, it has not been investigated thoroughly to determine to what extent the flow capacity of the well will be increased by the acid injection. The present study investigated the acidization of cylindrical cores of a sandstone (feldspathic quartzite) with mixtures of hydrofluoric and hydrochloric acid. Since only limited information was available about the dissolution rate in acids of common reservoir minerals, the dissolution rate of dolomite, calcite, and 2 feldspars was measured in a rotating disk system. The dissolution of dolomite in hydrochloric acid was measured at 600 psig and different temperatures. At 25/sup 0/C, the dissolution process is surface reaction limited; whereas, at 100/sup 0/C, the dissolution process approaches diffusion limitation. The rate of reaction is found to be proportional to a temperature-dependent fractional power of the hydrochloric acid concentration. The dissolution of calcite in hydrochloric acid was studied at 800 psig in the temperature range -15.6/sup 0/ to 25/sup 0/C. At 25/sup 0/C, the dissolution process is mass transfer limited; whereas, at -15.6/sup 0/C, both mass transfer and surface reaction limit the dissolution rate. (Longer abstract available)
OSTI ID:
5115930
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACIDIZATION
ALKALINE EARTH METAL COMPOUNDS
BENCH-SCALE EXPERIMENTS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
DISPERSIONS
DISSOLUTION
DOLOMITE
ENHANCED RECOVERY
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
MIXTURES
OIL WELLS
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
RECOVERY
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
TEMPERATURE DEPENDENCE
WELLS