Thickening Time Tests
Thickening time of a slurry is calculated to determine the time required to mix and pump the slurry. Mixing time for the volume is estimated from calculated slurry volume and mixing rate. Mixing rate varies from rig to rig, and is dependent on slurry design. Safety time is allowed to account for any shut down or slow mixing rates that may inadvertently occur.
The High-Pressure, High-Temperature (HPHT) Consistometer measures cement slurry viscosity or consistency under elevated pressure and temperature conditions.
Its primary function is to determine the maximum available pumping time of a cement slurry before the slurry reaches an un-pumpable consistency before setting. While designed for cement slurries, the effects of pressure, time and temperature can also be observed for other fluids, emulsions, dispersions, or slurries under static or dynamic conditions.
The HPHT Consistometer exposes a cement slurry sample to a controlled set of parameters of temperature, agitation and pressure that simulate the down-hole conditions. During a test, these parameters are carefully monitored and precisely controlled by the system software.
The data is automatically recorded to a database for future analysis to help predict the cement slurry's down-hole performance.
The HPHT Consistometer Control Software is the next generation of complete and powerful system control software with a simple and friendly, flexible user interface.
Friendly and Flexible User Interface
Instrument calibration results are reviewable/printable with Data Manager
Temperature up to 600°F (315° C)
Pressure to 40,000 psig (275 MPa)
Slurry cup rotation - 150 RPM per API specifications
Metal-to-Metal pressure chamber closure - ease of operation, less maintenance
Pressure chamber cooling coils - fast cool-down, quick cleanup
Ceramic-insulated electrical connections through pressure chamber
Allows for low temperature test (external chiller required)
Cooling can be made part of test sequence
Customizable hesitation squeeze:
Separate user controlled motor On/Off times
Fast update rate and event recording:
Triggered by Bc values or elapssed time
User friendly graphs:
Simultaneous charting of oil and slurry temperatures
Selectively view or hide charts
Marker to read any value on graph.
User can turn it on or off
Improved pressure control
Improved life of pressure control valve with addition of hardware
Better pressure control of the target pressure
Additional filtering improves reliability of hydraulics
*Bc-Bearden units of Consistency-units used to express the consistency of a cement slurry when determined on a pressurized consistometer.