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Rotating Disc Acid Reaction System, CRS-100, is a computer controlled acid reaction
system that allows for the controlled reaction of reservoir rock samples with acid
fracture fluids and the timed sequential collection of reactant fluid. From the
chemical analysis of the reactant and the experimental and sample collection data
from the CRS-100 the reaction rates of carbonate and dolomite samples can be calculated
and the results used in the design of effective acid stimulation treatments of wells.
The CRS-100 features a 3,000 psig (21 MPa) pressure vessel as standard with a 1
in. rotating disc, magnetic drive system, temperature control system, fraction collector
and data acquisition and control software. Pressure, temperature, acid displacement
and test duration are software controlled. The software permits the collection of
a number of reactant samples at preselected time intervals.
The CRS-100 has been specifically designed to measure rock/acid reaction rates using
common oil industry acids (Hydrochloric, Hydrofluoric, Acetic etc.) at pressures
of 3,000 psig standard and 5,000 psig and 7,240 psig as options and temperatures
up to 250 °C.
The equipment comprises a standard 500 ml capacity Hastelloy B acid cell with 500
ml and 1,000 ml options, to hold a core sample disk, which is rotated by the magnetic
drive mechanism. Acid is loaded into the pre-charge cell and displaced, by gas drive,
into the measurement cell immersing the sample an exact and known depth. Prior to
displacement both acid cells are either heated or cooled to the required temperature
and when displaced into the primary cell pressurized to the desired pressure. Effluent
samples are automatically displaced to and collected in the software controlled
All operations, including pressure, temperature, rotation speed, acid displacement,
sample collection and test duration are controlled by the operating software.