Successfully cementing the casing string of an oil or gas well is highly dependent upon the characteristics of the cement slurry. Properties that should be considered include consistency, density, the ability to quickly develop compressive strength, rheological properties, and filtration control. Well cements that have poor filtration control can lead to a complete failure of the cementing operation. In addition, the invasion of filtrates into producing zones causes formation damage, which can greatly reduce the production potential of the reservoir. Developing cement slurries that have minimal filtration loss prevents expensive remedial cementing operations and reduces formation damage. The OFITE Stirred Fluid Loss Tester provides a reliable means of determining the fluid loss characteristics of a well cement.
Method of Operation:
A cement slurry is poured into the test cell, which is then placed into the heating jacket. The gear drive system is connected to the agitation paddle, which is dimensionally equivalent to an atmospheric consistometer paddle. The desired test temperature is maintained by a digital PID temperature controller, while the necessary pressure is applied to the cell to prevent evaporation of the liquid phase. When conditioning the cement in accordance to API Specification 10 guidelines, the paddle is rotated at 150 rpm for 20 minutes. Once the cement is conditioned, the test cell is rotated 180 degrees and the desired differential pressure is applied to the cell. The filtrate is collected in a back pressure receiver for 30 minutes. The API defines fluid loss as the volume (ccs) of filtrate that is collected during this 30-minute interval.
Features and Specifications:
-Maximum pressure of 2,000 psi
-Maximum temperature of 400°F
-Temperature is maintained by PID temperature controller
-Variable paddle rotation speed (5 to 200 rpm)
-Filtration portion of cell is dimensionally equivalent to an API approved
HTHP test cell
Instrument Requirements:
-120 Volt, 60 Hz, 18 Amp power source
-220 Volt, 50 Hz, 10 Amp power source
Components:
#120-143 Packing Set
#120-503 Paddle Pin
#120-80-4 Temperature Controller
#152-37 AC Power Cord, 3-Conductor (120 Volt)
#152-38 AC Power Cord, 3-Conductor Int’l (220 Volt)
#153-14 Graduated Cylinder, Glass, 50 ml X 1 ml
#153-16 Graduated Cylinder, Glass, 25 ml x 2/10 ml
#165-44 High Temp Thread Lubricant, 1 oz Tube
#170-13 O-Ring for Cell Cap
#170-16 Valve Stem for Cell Cap
#170-17 O-Ring for Valve Stem
#170-18 Cement Screen, 325 x 60 Mesh
#170-20 Manifold Block
#170-35 Adjustable Wrench
#171-10 Back Pressure Receiver, 100 ml
#171-22 Retainer Pin
#171-44 Rubber Foot
#174-13 Motor
Optional:
#120-71 One Year’s Spare Parts for Stirred Fluid Loss Tester
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