Simplified calculation of CaCO/sub 3/ saturation at high temperatures and pressures in brine solutions

Journal Article · Thu Jul 01 04:00:00 EDT 1982 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/10352-PA· OSTI ID:7021184

Oddo, J E; Tomson, M B

A simplified method to calculate CaCO/sub 3/ saturation is developed using only commonly measured field parameters. The calculated saturation index, I/sup S/, and pH values are accurate at high temperatures and pressure in brines and are compared with less sophisticated and more complex calculations. The final forms of I/sub S/ and pH calculations are derived using conditional equilibrium constants dependent on temperature, pressure, and ionic strength, which eliminate the need for activity coefficients. The I/sub S/ equation is presented in forms for calculation with known or derived pH and where the pH of the solution is known. Practical application of I/sub S/ is shown by calculating the scaling tendency of several geopressure energy wells of the U.S. Gulf Coast region. 18 refs.

• Research Organization: Rice Univ, Houston, TX, USA
• OSTI ID: 7021184
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 34:7; ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALKALINE EARTH METAL COMPOUNDS
BRINES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCULATION METHODS
CARBON COMPOUNDS
CARBONATES
CHEMICAL COMPOSITION
ENGINEERING
EQUATIONS
OXYGEN COMPOUNDS
PH VALUE
RESERVOIR ENGINEERING
SATURATION