M5600 HPHT Rheometer

Rotational viscometer with direct-coupled torque transducer - no bearings
The Grace Instrument M5600 HPHT Rheometer is a true Couette, coaxial cylinder, and rotational rheometer, operating at high pressures up to 2,000 psi and temperatures up to 500°F. The unit incorporates a direct drive between the bob shaft and the torque transducer, which eliminates momentum of inertia errors usually associated with magnetically coupled torque transducers. Thus, the torque transducer can respond quickly and consistently to changing bob shaft torque, resulting in lower maintenance costs while allowing continuous testing of corrosive samples.

The only true rheology measurement under pressure
Other rheometers often utilize a magnetic coupling across a pressure vessel to rotate a magnet on a bob shaft, using metal or air bearings, in order to measure viscoelasticity; however, when the tested fluid possesses different G'/G" values compared to the calibration fluid, the G'/G" measurement will be invalid. A calibration fluid with known G'/G" values must be tested properly to provide a baseline for viscoelastic measurement. The M5600 HPHT Rheometer, also available with an optional viscoelastic module that performs viscoelasticity tests to derive G', G”, G* and phase angle. This vastly increases the researcher's ability to predict the behavior of fluids, such as their capacity for suspending and carrying solids (weight material sag, drill cuttings transport, proppant transfer, etc.)

Viscoelastic option available for G', G" and phase angle testing
The M5600 HPHT Rheometer does not employ magnetic coupling, instead taking direct measurements inside the pressure vessel, providing true measurement in a pressurized environment. This allows us to offer the M5600 dynamic option, which enables the user to perform true G' and G" viscoelasticity tests under pressure, without having to pre-test using fluids with known G'/G" values.

Cutting-edge database software enables customized search and data comparison
The application software, M5600 PC, includes powerful database tools for searching, categorizing, and comparing test results. The search criteria can include any test result parameter, including additives, descriptions, or other details. M5600 PC also allows you to overlap as many test charts as you like. Each test chart will display with customized graphics to differentiate it from other tests

Patented hardware design & detailed engineering lead to highly consistent data
The unique hardware and software design of the M5600 enable it to produce test results that are extremely repeatable, because process errors and other complications are eliminated by the robust and innovative configuration of hardware and software. By removing contamination and other interference from the test environment, the M5600 test results reflect the properties of the test fluid instead of the properties of the testing hardware.

Special U.S. patented hollow bob can test rheology and overcome the Weissenberg Effect
The M5600 also includes a special, U.S. patented hollow bob that allows researchers to test the rheology of non-Newtonian fluids and help overcome the Weissenberg effect. The bob design features off-centered axial direction holes, which creates a circulation path to refill the gap in the measurement zone should the liquid sample in the cup climb out, due to the Weissenberg effect. Because of the differential shearing at the bottom of the cup and the bob, along with the pressure difference if the measurement gap is vacant, tested fluid tends to refill the measurement zone and recirculate along the measurement zone if the Weissenberg effect occurs. Thus, the configuration of the hollow bob enables repeatable and reliable test operation using a broad selection of test fluids, methods, and environments.

U.S. Patents: 6,938,464
U.S. Patents: 6,951,127
U.S. Patents: 9,157,846
Dimensions: 8.5" Depth x 12.5" Width x 25.5" Height
Weight: 66 lbs (with bath) or 61 lbs (with carbon block)
Pressure Range:: Atm to 2,000 psi
Sample Size: 32 to 78 ml
Resolution: 0.01% of full scale range or better
Temperature Range: Ambient (20 °F with chilling device) to 500 °F
Speed Range: 0.0001 to 1,100 rpm continuous
Frequency Range: 0.01 to 5 Hz (Optimized at 0.2 to 3 Hz)
Amplitude Range: 0.1%  to 500 % (Optimized at 0.2% to 500%)
Shear Rate Range: 0.00004 to 1870 sec-1
Shear Stress Range: 1 to 15,000 dyn/cm2
Viscosity Range: 0.5 to 5,000,000 Centipoise
Torque:  14 μN.m to 100 mN.m
Repeatability: ±0.05% of full scale range or better
Power Voltage: 120V or 240V (with transformer)
Construction: Hastelloy C wetted material
Power Frequency: 50 Hz or 60 Hz
Computer Requirements: PC with MS Windows 9X/2000/XP/Vista/Win7
  • Allows the user to test samples with high acid concentrations, including fluids with 30% HCl
  • All wetted materials are Hastelloy C276 construction
  • Incorporates years of research into its innovative design
  • Oil or dry heat option (oil bath shown, above)
  • Fully digital with LCD screen
  • Fast test cycle: Setup-load-test-clean
  • Safety feature of temperature controller will stop heating if it sees temperature is above 520°F.
  • Separate thermostat from temperature control loop that will cut off bath heater power supply when its temperature is above 500°F
  • Includes 2 temperature controllers, one for control, the other for safety.
  • Over pressure relief valve
  • Repeatable results with Test flexibility
  • Includes M5600 PC™ software, which connects the M5600 with a Windows®-based PC
  • Tests are simple to set up and run
  • Customizable charts and real-time data are displayed during tests
  • Saved tests can be searched by any specified test parameter: test name, fluid ID, additive, researcher name, or more
  • SBC software on unit will stop heating if it sees temperature is too high
  • PC software will send stop heating command it if sees temperature is too high.
  • Also Available: M5600 HPHT Rheometer Carrying Case
  • Carrying Case includes an extendable handle and wheels for easy transportation
  • Each M5600 unit has multiple thermocouples, dedicated thermostat for over heating shutoff, special relief valves, integrated N2 regulator, all internal tubing rating for 10ksi, and pre-programmed shutoff points within M5600 software.
  • The new carbon bath is much cleaner than older oil bath and allows for heating at 2x rate.
  • The M5600 HPHT Rheometer is completely compliant to API 13 & 39 specified geometry.
  • It incorporates a direct measurement torque transducer and a separately controlled strain mechanism, which eliminates moment of inertia errors. These errors are often associated with magnetic coupling across a pressure vessel wall in a typical rheometer under high temperature and high pressure conditions.
  • The M5600 HPHT Rheometer enables tests to obtain values for G' and G", N' and K', all with the same API geometry.
  • Hastelloy C construction on wetted parts and multiple patented technologies enable it to test the most corrosive samples, including acids.
  • M5600 PC™ software allows both single- and multi-step real-time testing.
  • Standard rotational testing measures fluid viscosity under a constant shear rate (constant speed), which indicates only apparent viscosity, or how thick a fluid is. On the other hand, almost all drilling muds, fracturing fluids and cements have some "gelly" strength that enables them to suspend solid particles. This ability to suspend solids is very important to many oil field operations. The M5600 HPHT Rheometer oscillatory testing option provides the capability to measure how "gelly" a sample is, in addition to how thick the sample is, by providing G', G", and other data. 'This vastly increases the researcher's ability to predict the behaviors of these fluids, such as capacity for carrying solids (weight material sag, drill cuttings transport, proppant transfer, etc.). Oscillatory testing mode also completely removes measurement errors due to sample climbing.
  • The M5600 HPHT Rheometer features patented technology that can directly measure the true viscoelasticity of a sample under high temperature & high pressure conditions without magnetic coupling-induced measurement errors
  • The M5600 HPHT Rheometer unit comes equipped with an API 39 standard size rotor and bob, designated "R1B5", or rotor 1, bob 5. The B5 bob is very commonly used for fracturing fluid testing. To reduce sample climbing ("Weissenberg effect"), extended bobs, such as the XB5 and XB2 are recommended for testing crosslinked fluids or high molecule structure samples. For drilling fluids testing, we recommend the B1 bob.
Read more about our instrument's technical applications within these scientific and academic publications:

  1. Internal Phase Breaker Technology for Viscoelastic Surfactant Gelled Fluids
    Implementation of viscosity break tests to gather rheological data of a breaker system for complete and controllable reduction of viscoelastic gel viscosity at temperatures from 80° to 225° F.
    SPE 93449 (M5500 Rheometer)
  2. A Case Study of a Successful Matrix Acid Stimulation Treatment in Horizontal Wells Using a New Diversion Surfactant in Saudi Arabia
    Examination of the rheological properties of brines, foams, and spent acids composed of a new class of viscoelastic surfactants, as well as the diversion abilities of each system.
    SPE 93536 (M5500 Rheometer)
  3. Anionic Surfactant Gel Treatment Fluid
    Rheological testing of anionic viscoelastic surfactant and performance of the system due to the effects of temperature, salt concentrations and co-surfactants.
    SPE 105815
  4. Do Viscoelastic-Surfactant Diverting Fluids for Acid Treatments Need Internal Breakers?
    Introduction of a viscoelastic organic acid fluid, with internal breakers, capable of treating carbonate reservoirs and assuring complete treatment fluid cleanup. M5500 was used to generate rheological data with pressure and temperature.
    SPE 112484 (M5500 Rheometer)
  5. Rheological Properties of a New Class of Viscoelastic Surfactant
    Examination of the rheological properties of a new type of viscoelastic amphoteric surfactant, amine oxide, at temperatures from 75-220°F at 300 psi and various shear rates from 0.01-935 1/sec. M5600 was used to measure the apparent viscosity of live and spend acids under different conditions.
    SPE 121716
  6. Design Criteria and Application of High Density, Brine Based Fracturing Fluid for Deepwater Frac and Packs
    Analysis of fluid rheology, proppant transport, and fluid compatibility of high-density brine-based fluids implemented in deepwater Gulf of Mexico wells.
    SPE 124704
  7. Impact of Organic Acids/Chelating Agents on the Rheological Properties of an Amidoamine Oxide Surfactant
    Experimental investigation of organic acids and chelating agents used in amidoamine oxide surfactants, and their abilities to affect rheological properties of live and spent acid systems. M5600 was use to measure the apparent viscosity of live and spent acids under different conditions.
    SPE 128091
  8. Protecting Reservoir with Surfactant Micellar Drill-in Fluids in Carbonate-Contained Formations
    Development of a new surfactant micellar-based drilling fluid with internal breakers system in order to drill in carbonate contained reservoirs. M5500 was used to measure viscosity data for the surfactant-acid based on DIFs reacting with carbonate and crude oil contact with acid spent surfactant DIF.
    SPE 135166 (M5500 Rheometer)
  9. Impact of Hydrolysis at High Temperatures on the Apparent Viscosity of Carboxybetaine Viscoelastic Surfactant-Based Acid
    Study the viscosity alterations of amido-carboxybetaine acid fluids as a result of hydrolysis at high temperatures. M5600 was used to measure apparent viscosity vs. shear rate at 25°C and 1 atm.
    SPE 142264
  10. A New Technique to Control Fines Migration in Poorly Consolidated Sandstones
    Development of a new aqueous chemical system added directly to the treatment fluid in attempt to control migration of fines near wellbore as well as the fracture area. M5600 was used to measure viscosity of borate-crosslink guar and VES fluids.
    SPE 143947
  11. Characterization of Self-destructing Filter cake by Using computer Tomography
    Measuring the efficiency of filter cake removal method using a water-based drilling fluid system under high pressure high temperature conditions. M5600 was used to measure vscosity of filtrate fluid at 225°F and 300 psi.
    SPE 148124
  12. Compatibility and Phase Behavior Studies Between Corrosion Inhibitors and Surfactants-Based Acids
    Rheological performance, specifically viscosity, G', and G'', of amine oxide surfactants containing corrosion inhibitors from 75 to 300°F at 300 psi. M5600 was used to measure the rheological properties of live and spent acids under different conditions.
    SPE 151641
  13. Acid Placement: An Effective VES System to Stimulate High-Temperature Carbonate Formations
    Through the use of oscillatory rheometer, rotational viscometer, and coreflood tests, rheological properties of a new viscoelastic system which can form gel and maintain its viscosity at temperatures up to 300°F are analyzed. M5600 was used to rheological properties at 300 psi and a temperature range of 75 to 300 °F.
    SPE 157316
  14. Surfactant-Based Fluid-Loss Pills for ZnBr2 Based High-Density Completion Fluids and High-Temperature Applications
    Experimental investigation into the ability of a new surfactant system to effectively control fluid loss in high-density brine that contains ZnBr2 solutions at high temperatures up to 300°F. M5600 was used to measure viscosity and viscoelastic properties of surfactant to control fluid loss.
    SPE 165146
  15. Hydrolysis Effect on the Properties of a New Class of Viscoelastic Surfactant-Based Acid and Damage Caused by the Hydrolysis Products
    Observations of viscosity changes of viscoelastic surfactant acid systems at high temperatures and the impact of the damage caused by hydrolysis products. M5600 was used to measure the viscosities of the VES-based acids.
    SPE 165161
  16. New Insights into Shale Fracturing Treatment Design
    Study of the effect of various fracture fluid types on Mancos formation hydraulic breakdown pressure. M5600 was used to measure fluid viscosity.Study of the effect of various fracture fluid types on Mancos formation hydraulic breakdown pressure. M5600 was used to measure fluid viscosity.
    SPE 167754
  17. Optimizing Surfactant Additives for Enhanced Well Stimulation in Bakken Formation
    Laboratory evaluation of stimulation fluid additives and its effectiveness in increasing oil recovery in Bakken formation when used in properly designed fracture treatments. M5600 was used to test compatibility of surfactant A with several fracturing fluids.
    SPE 168180
  18. Effect of Dissolved Solids on Reuse of Produced Water and Proppant Handling in Hydraulic Fracturing Jobs in Tight Sand Gas Reservoirs
    Laboratory analysis of dissolved solid contents found in producing water and its effects on borate crosslinked guar-based polymers ability to transport proppant. M5600 was used to measure viscosity of gel at 140 °F and pressure of 300 psi.
    SPE 168614
  19. Innovative Use of NMR to Study the Fracture Fluid Propagation in Shale Formation
    Determination of the volume of fracturing fluid which is able to propagate inside shale cores based on fracturing fluid viscosity and injection pressures. M5600 was used to measure fluid viscosity.
    SPE 168619
  20. Enhancing Well Stimulation with Improved Salt Tolerant Surfactant for Bakken Formation
    Development of a new stimulation surfactant which will enhance the initial production and maintain long term production of the middle-member Bakken formation. M5600 was used to test compatibility of surfactant A with several fracturing fluids.
    SPE 169141
  21. Effect of Dissolved Solids on Reuse of Produced Water in Hydraulic Fracturing Jobs
    Introduction of a new viscoelastic acid system which can form gel and maintain its viscosity at temperatures up to 300° F. M5600 was used to obtain a relationship between the rheological properties and crosslink network structure of a fluid.
    SPE 169408
  22. Nanotechnology Applications in Viscoelastic Surfactant Stimulation Fluids
    Nanotechnology application in viscoelastic stimulation fluid system in order to maintain rheological properties at high temperatures as well as controlling fluid loss without formation damage.
    SPE 107728
  23. Fast Hydrating Fracturing Fluid for Ultra High Temperature Reservoirs
    Development of a fast-hydrating synthetic copolymer and metal crosslinker capable of maintaining ideal rheological properties for successful fracturing operations at bottom-hole temperatures up to 450°F. M5600 was used to evaluate the actual thermal stability of the fluid at the desired temperature and pressure.
    SPE 172018
  24. Viscoelastic Behavior and Proppant Transport Properties of a New High Temperature Viscoelastic Surfactant-Based Fracturing Fluid
    New surfactant technology combining Gemini cationic and anionic surfactants in water, allows for a more effective viscoelastic surfactant system which is able to gel and maintain desirable viscosity at temperatures up to 275°F. M5600 was used to measure rheology of the surfactant gel at a temperature range of 75 to 250 °F and pressure of 500 psi.
    SPE 173745
  25. Reduced Polymer Loading, High Temperature Fracturing Fluids using Nano-crosslinkers
    The viscosity of gel samples with different nano-crosslinker concentrations were tested at high HPHT conditions to investigate the influence of the nano-crosslinkers on a gel's ability to suspend proppant.
  26. The Effect of Chelating Agents on the Use of Produced Water in Crosslinked-Gel-Based Hydraulic Fracturing
    Investigation of the effect of different chelating agents on the use of high-TDS produced water in high pH borate-crosslinked gels used in hydraulic fluid. Apparent viscosity of hydraulic fracturing fluid was measured at 180°F and at 300psia. Test performed at constant shear rate of 100s-1 with shear ramps (75, 50, 25, 50 and 75 s-1) repeated every 30 minutes.
  27. Laboratory Study on Using Produced Water in High pH Borate Gels Used in Hydraulic Fracturing
    Investigation of the fesibility of using produced water to formulate crosslinked-gel-based fracturing fluid. All apparent viscosity measurements of the of produced-water-base fracturing fluid were conducted at a temperature of 180°F and a pressure of 300psia. All test were conducted with B5 bob and 52 cc fluid volume.
  28. A New Fracturing Fluid for HP/HT Applications
    Investigation of the effects of viscosifier concentration, temperature and salts on rheological properties and proppant suspending ability of V1-based fluid. The apparent viscosity of the fluids were measured at different temperatures (75, 245, 295 and 350°F). Both rotor and bob of the rheometer were made of Hastelloy C to resist acid corrosion.
  29. New Al-based and Dual Cross-linkers to Form a Strong Gel for Hydraulic Fracturing Treatments
    Investigation of the effects of various parameters including polymer loading, aluminum-based and aluminum-zirconium crosslinker concentrations, pH, and temperatures on rheological properties to achieve an ideal hydraulic fracturing fluid.