FANN 101511610

The iX77™ Rheometer is a coaxial cylinder type that was developed to measure

fluid rheologies under high pressures and temperatures with a high degree of safety.

The FANN® design is based on a machine developed by the Sandia National

Laboratories. It was designed with oil well and geothermal drilling fluids in mind

but has applications in many other fields. It features extensive safety interlocks

through not only the internally mounted computer but also mechanical and smart

electronic hardware.

Specifications of the iX77™allow operation to 600°F (316°C) and 30,000 psig

(206,840 kPa). Optionally, a chiller may be attached and controlled by the software

to allow operation below lab temperatures.

The control software is intended to automate the operation, data collection, reporting

and notification functions of the iX77 Rheometer to the greatest extent practical, thus

allowing the operator maximum flexibility.

The goal in designing the software was to automate as much as possible, while still

permitting the machine to be configured and operated as needed by an advanced

user.

The one-piece bench top design makes it suitable for use on a well site as well as in a

laboratory. Special consideration should be given for moving and installing this

instrument because of its weight (350 lbs) and its stature. A strong low-profile (32

in) bench top is recommended for easier cell removal. It uses a unique magnetic

sensor to detect the motion of the jewel mounted torsion assembly in the test cell.

The sensor system can be calibrated to ± one degree (equivalent to one centipoise at

300 RPM).

Test pressures are generated by an air-operated high-pressure hydraulic pump and

controlled by a smart back pressure controller, high-pressure valve and pressure

transducer. The pressurization fluid fills the upper portion of the test cell. The

pressurization fluid is in direct contact with the quiescent sample, above the sample

in the measurement area. The contact area is small to minimize mixing.

The inlet air Filter/Dryer/Regulator system has an automatic drain that vents through

the system drain when excess water is detected. When the inlet air is initially

supplied, the automatic drain is open and requires a quick pressure input to cause the

automatic drain to seat.