During cementing operations, the time required for a cement slurry to set is of primary concern. Under an ideal situation, minimal time would be required to successfully pump the slurry, which immediately upon placement, begins to develop compressive strength. However, if insufficient time is allowed to fully pump the cement, it will be necessary to drill the cement remaining in the casing string. Remedial operations such as this are very costly. Conversely, cements that are successfully placed, but require considerable time to cure, consume valuable rig time, which is also quite costly. Laboratory tests should be conducted under simulated reservoir conditions to examine the actual thickening time of the slurry. The OFITE
HTHP Consistometer was specifically engineered to determine the thickening time of well cements under simulated downhole pressures and temperatures.
Method of Operation:
A cement is mixed and poured into the slurry cup assembly. The slurry cup is placed into the test vessel and pressure is increased via an air-driven hydraulic pump. A PID temperature controller governs an internal heater, which maintains the necessary temperature profile, while a magnetic drive mechanism rotates the slurry cup assembly at 150 rpm. A potentiometer controls an output voltage, which is directly proportional to the amount of torque the cement exerts upon an API-approved paddle. A dual channel strip chart recorder registers cement consistency and temperature as a function of time. Temperature and consistency are digitally displayed via LED indicators.
Features and Specifications:
-Maximum operating temperature of 600°F/400°F
-Max. allowable working pressure of 40,000 psi/25,000 psi
-Digital temperature controller, 1° resolution
-4,000 watt internal heater (5,000 watt available)
-Pressure indicator resolution is 100 psi and incorporates high and low pressure alarms
-Slurry cup rotational speed is 150 rpm
-Pressure generated via an air-driven hydraulic pump
-Slurry cup constructed of 316 stainless steel and incorporates an expansion chamber
-Drive table is rotated with a magnetic drive
-External cooling jacket aids cooling of test cell
-Electronic timer with alarm, elapsed 0.1 minute resolution
-Deadweight calibration unit included
-Temperature, pressure, and consistency alarms provide automatic shutdown
-Safety head with rupture disk are provided
-Unit is fully capable of testing cements in strict accordance to the guidelines as stated within API Specification 10
Options:
A Digital Acquisition System (DAS) is available for both the Model 100 and the 120. This option permits an IBM or compatible computer to measure and record consistency and temperature data. All measured variables are graphically displayed on a color monitor.
Instrument Requirements:
-Air/Nitrogen supply (100-120 psi)
-Water supply for cooling (40 psi)
-Water drain
-220 Volt, 50/60 Hz, 25 Amp electrical power supply
Size: 66 x 36 x 32 inches (167.6 x 91.4 x 81.3 cm)
Weight: 1,400 lbs (635.6 kg)
Crated Size: 74 x 44 x 40 inches (188 x 111.8 x 101.6 cm)
Crated Weight: 1,600 lbs (726.4 kg)
Components:
#120-001 Mineral Oil, Gallon
#120-102 Rupture Disk, 26,500 psi
#120-105 High Pressure Check Valve
#120-106 High Pressure Filter
#120-200 Heater Assembly, 4000 Watt
#120-204 Heater Gaskets
#120-208 Slurry Cup Thermocouple
#120-305 Strip Chart Recorder Paper
#120-306 Annotation Pen
#120-307 Red Chart Recorder Pen
#120-308 Blue Chart Recorder Pen
#120-309 Green Chart Recorder Pen
#120-401 O-Ring, Metal
#120-501 Slurry Cup Sleeve
#120-502 Slurry Cup Diaphragm
#120-503 Paddle Pin
#120-504 Pivot Bearing
#120-505 Pivot Bearing Gasket
#120-506 Paddles
#120-507 Paddle Shaft
#120-508 Retaining Ring for Diaphragm
#120-509 Drive Disk
#120-510 Drive Bar
#120-511 Slurry Cup Shear Pin
#120-512 Slurry Cup Drive Pin
#120-513 Slurry Cup Gasket
#120-519 Slurry Cup Assembly
#120-520 Long Paddle Shaft
#120-602 Potentiometer Calibration Spring
#120-604 Potentiometer Resister
#120-606 Potentiometer Contact Arms
#120-607 Contact Strips
#120-628 Potentiometer Assembly
Optional:
#120-01 One Year’s Spare Parts for 120-00
#120-02 Two Year’s Spare Parts for 120-00
#120-11 One Year’s Spare Parts for 120-10
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![[Image of 120-05]](120-05.jpg)