M7500 Ultra HPHT Rheometer

Patented design prevents sample contamination
The Grace Instrument M7500 Ultra HPHT Rheometer is a coaxial cylinder, rotational, high pressure, and high temperature rheometer. It is engineered to measure various rheological properties of fluids (including API HPHT tests) under a range of pressures and temperatures, up to 30,000 psi and 600°F. An optional cement module is also available for testing the rheology of cements (see tab "Cement Rheometer", below.)

The Grace Instrument M7500 Ultra HPHT Rheometer employs a unique, patented design which entirely prevents contact between sample fluid within the main test chamber and pressurization fluid, which is injected into interlocking isolated chambers above the test chamber. No other rheometer on the market today can make this claim.

Optional components add multiple test functions while saving time, money, and laboratory space
Hardware modules are available which add specific functionality to the M7500, including cement testing, pressure/volume testing, linear swell testing, and more. These modules take the place of stand-alone equipment and can be integrated into the standard M7500 training program, saving training time and consolidating test times. This feature alone enables the M7500 Ultra HPHT Rheometer to provide an excellent ROI.

Dimensions: 22" height x 12" width x 24" depth (Tower)
12" height x 25" width x 15.5" depth (Cab)
Weight: 250 lbs.
Construction: Stainless Steel
U.S. Patent: 7,287,416 and 7,412,877
Sample Size: 132 ml
Temperature Range: Ambient (20°F with chiller) to 600°F
Speed Range: 0.01 to 600 rpm continuous
Viscosity: 0.5 to 5,000,000 Centipose
Torque: 7μN.m to 10 mN.m
Pressure Range: Atm. to 30,000 psi
Shear Rate: 0.0082 to 1020 S-1
Shear Stress: 2 to 10,000 dyn/cm2
Repeatability: ±1% of full scale range or better
Resolution: 0.3% of full scale range or better
Voltage: 120 VAC or 240 VAC (with transformer)
Coolant Supply: Tap water or chiller
Compressed Air: 120 psi
Computer Requirements: PC with MS Windows 9X/2000/XP/Vista/Win7
  • The M7500 is built with a thick-walled steel pressure cell, which is surrounded by a fail-safe steel containment vessel to ensure operator safety.
  • It is designed for easy test set up, sample loading and post-test cleaning.
  • Cool-down after tests can be accomplished more quickly by connecting a tap water supply or a chiller into the M7500 cooling fluid loop.
  • Innovative patented design ensures against contamination of test sample with pressurization fluid.
  • Recently patented design eliminates the need for fragile and expensive "V" jewel bearings.
  • A computer-controlled, magnetically-coupled stirrer agitates the sample during testing
  • Provides users with sturdy unit, safe operation, and low maintenance
  • Engineered for safe testing with extreme pressure and temperature settings
  • Offers repeatable results and test flexibility
  • Unit includes an LCD screen and PC interface
  • Instrument does not compromise sample integrity
  • Fully digital and automatic
Comparison between Grace M7500 and Leading Competitor
Grace M7500 Competitor
Bearings Patented and patent pending design eliminates jewel bearings. Use ball bearings. Easy to replace.
Very economic.
V Shape jewel bearings. Fragile, easy to break, difficult to install, very expensive.
Mixing with Pressurization Fluid Patented and patent pending design prevents tested sample to mix with pressurization fluid as long as tested sample is compressed less than 23% of volume. Tested sample will mix with pressurization fluid when tested sample is compressed more than 2.5% of sample volume.
Speed Range Standard range 0.01 to 600 RPM. 3 to 600 Rpm continuously.
Electronics Almost all electronic components are from third party reputable companies with excellent quality tracking records. Easy to replace in the future. Majority of the electronics are special designed PCB by fann Instrument. Easy to break down. Very difficult to replace and re-calibrate. Very expensive to maintain.
Operation Patented and patent pending design very easy to operate. Test turn around time is about one quarter of fann 75. No need for re-calibration before every test. Need special training to perform testing. Very difficult to operate due to extremely complex mechanical designs. Need calibration before every single test. Very difficult to calibrate too.
Software State of the art PC software with Database engine, real-time charting, various 2D & 3D charts, and unlimited chart overlapping. Database management of test results, searchable by test name, additives, etc. Limited functions designed almost 10 years ago.
Calibration Automatic shear stress calibration. Requires user to go through some complicated steps and mechanical adjustment before able to start calibration.
Weight & Dimensions Separate cell tower and control cabinet. Smaller foot print, height and weight. Movable by two personnel One integrated unit. Can only be moved by 4 people. Dangerous to move around due to its whole weight.
Downloads for the M7500 Ultra HPHT Rheometer:

Read more about our instrument's technical applications within these scientific and academic publications:

  1. Clay Nanoparticles Modified Drilling Fluids for Drilling of Deep Hydrocarbon Wells
    Laboratory investigation of nano-form palysgorskite drilling fluid and its rheological properties including plastic viscosity, yield point, gel strength etc. under operating conditions.
    Applied Clay Science 86 (2013) 76-82
  2. Laboratory Development and Field Application of Novel Cement System for Cementing High-Temperature Oil Wells
    Development of a new cement system consisting of a new retarder and fluid loss control additives, in order to effectively perform a successful cement job in high temperature exploration wells. M7500 was used to measure slurry rheology at 1000 psi and 150°C.
    SPE 132711
  3. Viscosity Influences of High Pressure on Borate Crosslinked Gels
    Rheological analysis of the influence of high pressures on borate crosslinked gels, specifically significant viscosity losses. M7500 was used to measure viscosity of fracturing fluid (gel) at low pressures.
    SPE 136187
  4. The Unexpected Rheological Behavior of Borate Crosslinked Gels
    Testing of various fracturing fluid systems subjected to pumping pressures typical of hydraulic fracturing treatments, specifically borate crosslinked polymeric fluids. M7500 was used to measure viscosity of fracturing fluid (gel) at low pressures.
    SPE 140400
  5. Shear Sensitivity of Borate Fracturing Fluids
    Laboratory testing procedures to stimulate wellbore shear environment and its impact on the rheological properties and performance of borate crosslinked fluids. M7500 was used to observe pressure sensitivity with viscosity reduction at high pressure and elevated temperature.
    SPE 143962
  6. Advanced Cementing Systems for Deep Sour Gas Wells
    Laboratory development of advanced cement system for cementing deep sour gas wells, characterized by high bottom-hole static temperature and pressure. M7500 was used to test cement slurries following procedures described in API RP10B.
    SPE 149063
  7. Rheological Properties of Invert Emulsion Drilling Fluid Under Extreme HPHT Conditions
    Laboratory analysis of rheological properties of invert drilling fluids under extreme high pressure high temperature conditions (T > 500°F, P > 20,000 psi).
    SPE 151413
  8. Nanomaterials in Fracturing Applications
    Synthesis of the efficiency of guar crosslinking in a boronic acid-functionalized nanoparticles and its potential usage in oilfield materials based on rheological and stability testing.
    SPE 155533
  9. Unusual High-Pressure Tolerance of Polyboronic Crosslinked Gel Under High-Temperature Rheology Conditions
    Rheological testing of polyborate crosslinked fluids at high temperature and pressure to obtain viscosity profile as well as pressure tolerance under such conditions. M7500 was used to test high pressure rheology following standard procedures in API RP39.
    SPE 173708
  10. Development and Application of a State of the Art Fully Synthetic Single Filtration Control Additive Providing Optimum Rheology in WBM: An Innovation of the Medium Temperature Drilling Market
    Development of cost-effective, fully synthetic polymers which maintain rheological properties of water based muds under high pressure and high temperature conditions. M7500 was used to test rheology of water based mud.
    SPE 173715
  11. Next-Generation Boron-Crosslinked Fracturing Fluids: Breaking the Lower Limits on Polymer Loadings
    Investigation of rheological properties of a next-generation boron crosslinker with a new hydroxypropyl guar that requires 40 to 60% less polymer. A 132-mL fluid sample was tested using a heatup profile and maintained at a pressure of 500 psi.