The Model HTD8040 High-Pressure High-Temperature (HPHT) Consistometer is used to evaluate the consistency or pumpability of cement slurries. Operators can determine the maximum available pumping time of cement slurry before it reaches a non-pumpable consistency before setting. The Model HTD8040 HPHT Consistometer measures the thickening time of cement slurries under simulated downhole pressure and temperature conditions. Its maximum operating conditions are 600°F (315°C) and 40000 psi (275 MPa). The thickening time of cement slurry is a good indicator of how long the slurry will remain pumpable. Thickening time is the time required for stirred cement slurry to reach a consistency of 100 Bearden units (Bc). The Bearden unit of consistency (Bc) is a dimensionless quantity from 0-100 units. The Bc number corresponds to the torque required to deflect an electrical potentiometer. The Model HTD8040 HPHT Consistometer is designed for conformance with relevant standards and practices as published by API Subcommittee 10 on Well Cements.
2 Safety
Follow the instructions provided to avoid personal injuries or equipment damage. Always wear appropriate personal protective equipment when operating or maintaining the Model HTD8040. Two front casters with attached locks support the consistometer. When the instrument is not going to be moved, its casters should be locked to keep the instrument from moving unexpectedly. If the instrument needs to be moved, at least two people who have experience moving heavy machines should move it.
2.1 Safe Pressurization
The Model HTD8040 HPHT Consistometer has pressurized air, water, and hydraulic linesthat present a hazard if not depressurized before maintenance or disassembly. The hydraulic pump and the pressure relief valve require compressed air. This air is generally pressured to 100 psi ( 689 KPa). Before working on any of these devices or connected air lines, shut off the compressed air supply to the machine, and carefully relieve air pressure from the machine. The high-pressure lines may be pressurized up to 40000 psi (275 MPa). Use the pressure-down or drain switch on the front panel to release the pressure. To confirm that the all pressure is released.
2.2 Safe Heating
The chamber has an internal electric heating element that can exceed 600°F (315°C). Before opening the pressure chamber, use the cooling system to lower the temperature to at least 120°F (49°C). The machine uses domestic water as coolant. Shut off the domestic water supply before servicing.
2.3 Safe Electrical Operation
Disconnect the power cable before attempting any electrical or mechanical maintenance. Be aware that after the power switch is turned off, the electrical terminals inside the panel will remain electrically energized. Refer to the electrical schematic before performing maintenance or troubleshooting.
2.4 Environmental Considerations
This machine tests cement slurries containing additives, using white mineral oil as a pressurizing fluid. The operator must be aware of proper handling and disposal practices for these materials.
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