
MACS II User Manual
101796668
Revision E
5
down-hole conditions of a well. During testing, it monitors, controls, and records
these parameters to form a data set. This data can then be analyzed to assist in
predicting the performance of cement slurry in a well.
If a situation exists that a well presents particular problems or special conditions of
temperature and/or pressure, the MACS II can assist to minimize possible problems
by providing a safe and controlled environment in which to test different cement
slurries for the drilling process.
The maximum temperature for the MACS II analyzer is
600˚F. The maximum pressure for the MACS II analyzer is
30,000 PSI.
1.1.1.
Transition Time
Transition time is determined by the measuring the static gel strength of cement
slurry. Transition time is the elapsed time from the occurrence of static gel strength
of 100 lb/100 ft
2
to the occurrence of static get strength of 500 lb/100ft
2
.
This test determines the gel strength development of cement slurry after it has been
placed in a well and allowed to remain static. Rapid static gel development (short
transition time) indicates good gas migration control.
1.2.
Special Considerations
The MACS II is a unique device that performs analysis for cement slurry. In order to
perform reliable tests, the unit generates significant temperatures and pressures.
Care and caution should be exercised to minimize the potential for personal injury
and/or damage to facilities.
The mag drive, pressure inlet port, pressure control port, manual and dump
valve ports are all intricately designed so that routine connections and
disassembly are not necessary on the chamber. This helps prevent thread
wear in the chamber and cap.
The manual relief valve located in one of the three ports located in the
chamber bottom is designed for relieving pressure from the chamber when all
other means have failed. Do not use this to routinely relieve pressure. Do not
use this manual value until the slurry temperature is below 140˚F. .
When a test is to be run at a higher temperature, use an O-ring rated for
higher temperature (P/N 101710014) on the chamber lid. On tests less than
20000 PSI and 250˚F, use the standard O-ring (P/N 206712).
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