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Return Permeability Test Apparatus is a high pressure, high temperature development
of the 100 series designed specifically for the evaluation of drilling mud and mud
additives and their affect on reservoir rock samples. A re-designed layout improves
operator access to the core holder, accumulators allowing for increased efficiency
The system allows a number of tests to be conducted including liquid permeability,
return permeability; mud lift-off, leak-off rates and the evaluation mud additives
at reservoir temperature and pressure. A custom reciprocating mud pump allows mud
to be re-circulated across the upper end face of the core sample, at a con trolled
shear rate, to simulate filtrate build up and to allow the evaluation of leak off
rates. Differential pressure transducers measure the pressure drop across the core
material allowing investigation of the depth of invasion of the filtrate and a PC
linked digital balance monitors the leak-off rate. The core holder in encapsulated
in a custom designed heating jacket and all inlet lines are fitted with block heaters
allowing the accumulators to be kept at ambient conditions. Allowing easy cleaning
and loading of the accumulators to maximize the number of fluids evaluated daily.
With the addition of extra fluid accumulators the system can be used to evaluate
non-acid clean-up treatments. Whilst with the optional construction of wetted parts
in Monel allows the evaluation of non-inhibited acids.