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HPHT Rheometer
HPHT Rheometer
Description
The Coretest HPHT Rheometer brings true downhole-condition rheology to the bench. A Couette concentric-cylinder cell rated to 2,000 psi (138 bar) and 260 C (500 F) reproduces real reservoir pressure and temperature, so drilling fluids, cement slurries and fracturing fluids are characterized as they actually behave under load - not as they look at ambient.
At its core is a deliberate engineering choice: a torsion-spring torque element coupled directly to the bob and read by a high-resolution optical encoder. Torque is measured directly - no magnetic couplings, no intermediate drives - eliminating the hysteresis and inertia errors of magnetically-coupled designs. The optical encoder never wears (unlike potentiometric sensors) and can be serviced or recalibrated without opening the high-pressure cell.
Built to be lived with: every wetted part is Hastelloy C276 - the benchmark for acids and brines; there are no bob-shaft bearings to wear out; and seals and bob are operator-replaceable with standard tools, no service engineer or special fixtures. A dry sliding carbon-block heater (1,200 W) reaches temperature fast and cools to ambient in under 15 minutes. Dual temperature controllers and certified pressure relief keep operation safe.
The Windows software programs multi-step tests, acquires data in real time and computes the full rheological picture automatically - Bingham plastic (PV/YP), Power Law (n, K), Herschel-Bulkley (t0, n, K), 10s/10min/30min gel strengths and API RP 13D dial readings (600/300/200/100/6/3 rpm) - exporting straight to Excel.
Measurement envelope: viscosity 0.5-5,000,000 cP, shear rate 0.00004-1,870 s-1, shear stress 1-15,000 dyn/cm2, speed 0.0001-1,100 rpm continuous, 50 mL sample, 0.01% full-scale resolution; ISO 13503-1 and API RP 39 compliant.
Engineered by a team that has serviced and repaired both leading HPHT rheometer platforms for years, the Coretest HPHT Rheometer combines the best of each while designing out their known weak points. (First unit: prototype complete, software in development; production delivery 6-8 months from order.)
Specifications
| Max Pressure | 2,000 psi (138 bar) |
| Max Temperature | -7 to 260 C (500 F) |
| Speed Range | 0.0001 to 1,100 rpm (continuous) |
| Shear Rate Range | 0.00004 to 1,870 s-1 |
| Shear Stress Range | 1 to 15,000 dyn/cm2 |
| Viscosity Range | 0.5 to 5,000,000 cP |
| Torque Range | 14 uN.m to 100 mN.m |
| Resolution | 0.01% of full scale |
| Sample Volume | 50 mL +/- 5 |
| Cell Geometry | Concentric cylinders (Couette) |
| Wetted Materials | Hastelloy C276 |
| Torque Sensor | Torsion spring element (direct) |
| Angular Sensor | Optical incremental encoder |
| Oscillation / Dynamic Mode | In development |
| Heater | Dry sliding carbon block, 1,200 W |
| Standards | ISO 13503-1, API RP 39, API RP 13D |
| Software | PC-based Windows software |
| Availability | Prototype; production 6-8 months from order |
Comparable instruments
Side-by-side comparisons based on each manufacturer’s published specifications.
- Alternative to the Grace M5600
A spec comparison of the Coretest HPHT Rheometer and the Grace M5600. Same 2000 psi / 500 F rotational envelope; an honest read on where each fits. - Alternative to the Chandler 5550
Alternatives to the Chandler 5550: the Coretest HPHT Rheometer covers the same 2000 psi / 500 F class and reaches a lower minimum shear rate. - Alternative to the Brookfield PVS
The Coretest HPHT Rheometer vs the Brookfield PVS: different pressure classes, an honest look at which fits.
Model names are trademarks of their respective owners. Coretest is not affiliated with these companies.
| Model | HPHT Rheometer |
| Brand | Coretest |
