Ultra HTHP Laboratory Rheometer

MUD TESTING EQUIPMENT

For years, Inmotion Energy has supplied
precision instruments and drilling tools for
testing drilling fluids, well cements, and
completion fluids.

From our Bangalore facility, we provide
customers across India and the Middle East
with quality products and exceptional
service.

As an independent manufacturer, we have one priority: our customers.

INDUSTRIES WE SERVE

— Onshore & offshore drilling contractors
— National & independent oil companies
— Mud engineering & testing laboratories
— Well completion & workover operations

WHY CHOOSE US

— Rigorous quality control on every unit
— Fast turnaround on spares &
replacements
— Field-tested designs, built for uptime

INMOTION ENERGY (OPC) PRIVATE LIMITED

PRODUCT SPECIFICATION — Ultra HTHP Laboratory Rheometer

Model: IM-RHEO-HTHP Compliance / target standard: Dynamic R&D (Up to 320 C)

The ultra HTHP laboratory rheometer measures the rheology of drilling, completion and fracturing fluids under simulated downhole pressure and temperature. The fluid is held in a sealed, heated pressure cell in which a coaxial rotor is driven through a magnetic coupling; torque is measured by a transducer and converted to shear stress. Programmable temperature and pressure ramps reproduce a well profile up to the rated 320 C (608 F).

Figures 2a and 2b. Ultra HTHP Laboratory Rheometer (reference photographs). Components are listed on page 2.

Intended applications

• Rheological profiling of HTHP water-based and oil-based muds through temperature and pressure cycles.
• Gel-strength progression, thermal thinning and barite-sag risk in deep, hot wells.
• Testing completion brines, fracturing gels and viscosified spacers.
• Generating shear stress vs shear rate data for hydraulics software and model fitting.

FEATURES

• Programmable heating to 320 C with ramp, hold and cool-down profiles.
• Magnetic-drive coaxial geometry that avoids dynamic seal friction on the torque path.
• Automated shear-rate sweeps with software calculation of PV, YP, n and K.
• Pressure-relief and over-temperature protection.
• Data logging and export for QA records.

TECHNICAL SPECIFICATIONS

Maximum Temperature	320°C (608°F) as per equipment designation
Maximum Pressure	Typically 10,000–20,000 psi class (confirm on datasheet)
Geometry	Coaxial cylinder, API-equivalent shear-rate factor
Speed Range	Typically 1–600 rpm, programmable
Sample Volume	Typically 50–150 mL depending on cell
Heating / Control	Electric jacket, PID controlled
Data Interface	PC software with real-time plotting and export

Values are typical for this equipment class based on API/ASTM practice and manufacturer literature (OFITE, Fann, Chandler); confirm against the Inmotion datasheet before use in a certificate or specification.

Main components (see Figure 2)

No.	Component
1	Drive motor and magnetic coupling
2	Control cabinet with display
3	Pressure line and gauge
4	Heating jacket and pressure cell
5	Cooling coil and pressurising line
6	Base frame

Principle of operation

A drive motor rotates an outer magnet that carries the rotor inside the sealed cell through a magnetic coupling. The fluid’s resistance produces a torque, sensed by a transducer and converted to shear stress; the programmed rpm sets the shear rate. Temperature and pressure are controlled independently so that viscosity can be recorded as a function of both. Results are fitted to Bingham, Power-Law or Herschel-Bulkley models.

Basic operating procedure

1. Prepare and condition the sample according to the test plan; record fluid density.
2. Fill the cell to the mark, fit the rotor and close the cell with the correct seals.
3. Pressurise with nitrogen to the initial pressure and check for leaks.
4. Program the temperature, pressure and shear-rate profile in the software.
5. Run the test and monitor torque, temperature and pressure in real time.
6. Cool below 50 C, vent pressure slowly, open the cell, remove the sample and clean all parts.

Calibration and maintenance

• Replace O-rings and seals on schedule; use high-temperature thread lubricant.
• Check torque calibration with a Newtonian oil at ambient temperature.
• Calibrate thermocouple and pressure transducer at least annually.
• Test the pressure-relief device and inspect vessel threads for wear.

Safety precautions

• Never open the cell above 50 C or while pressurised.
• Use a face shield and heat-resistant gloves; secure nitrogen cylinders.
• Operate only within the rated pressure and temperature; trained personnel only.

Reference sources