Geochemical modeling of scale formation, and formation damage during production from sulfate and carbonate mineral-bearing reservoirs
- Univ. of Wyoming, Larmie (United States)
The physical and chemical processes that affect reservoir fluids during production can be modeled by methodologies similar to those used for modeling clastic diagenesis. That these processes may result in formation damage and scale formation make them of interest to production geologists and engineers. Pathway modeling, based upon a series of critical divides, predicts which reactions are likely to occur between formation, production tubing, and reservoir fluids. Thermodynamic equilibria modeling calculates direction and magnitude of possible reactions. Integration of these approaches with observations of patterns of scale formation, production line, and formation damage yield a model capable of predicting the magnitude and direction of reactions that may produce negative impacts on reservoir production. Critical divides characterizing these processes in carbonate and sulfate mineral-bearing reservoirs include: (1) presence or absence of sulfate-bearing minerals within the production volume; (2) presence of iron within production line or formation; (3) ratio of concentration of bicarbonate to hydrogen sulfide; (4) capacity of aqueous and solid phases to buffer formation fluid pH; and (5) magnitude of pressure and temperature drops during production. The model qualitatively predicts: (1) likelihood of sulfide, sulfate, or carbonate mineral precipitation during production; (2) souring of the reservoir; and (3) corrosion of production tubing. The model has been developed from production histories for Weber Sandstone reservoirs, Colorado and Wyoming, and has been applied to examples of reservoir production from Tensleep and Minnelusa reservoirs in Wyoming.
- OSTI ID:
- 7170913
- Report Number(s):
- CONF-910403-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
NATURAL GAS WELLS
FORMATION DAMAGE
SCALING
OIL WELLS
RESERVOIR FLUIDS
CHEMICAL REACTION KINETICS
CORROSIVE EFFECTS
CARBONATE MINERALS
CORROSION
DESCALING
FORECASTING
GEOCHEMISTRY
GEOLOGIC FORMATIONS
MATHEMATICAL MODELS
PRODUCTION
RESERVOIR ROCK
SCALE CONTROL
SULFATE MINERALS
WYOMING
CHEMICAL REACTIONS
CHEMISTRY
CONTROL
DEVELOPED COUNTRIES
FEDERAL REGION VIII
FLUIDS
KINETICS
MINERALS
NORTH AMERICA
REACTION KINETICS
SURFACE FINISHING
USA
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing