Abstract: A material sample representative of a subsurface formation is tested for its dynamic interaction with a coring fluid. The material sample is subjected to a pressurized and agitating coring fluid to simulate a coring operation. Thereafter the material sample is x-ray scanned to identify the extent of coring fluid invasion during the dynamic interaction of the material sample and the coring fluid.

Abstract: A dynamic filtration unit for drilling and completion fluids employs an adjustable size annulus, high filtration pressures and temperatures, automatic filtration collection and measurement, and natural or artificial filters.

Abstract: Temperature control apparatus for a system for testing drilling mud includes instrumentation for measuring the parameters of the drilling mud, and a pump for pumping the drilling mud in a recirculating path through the instrumentation. A mud heater in the recirculating path heats the mud and a heat exchanger connected in the front of the heater in the recirculating path cools the mud before it is heated. The heater and the heat exchanger are controlled to maintain a constant differential across the heater. The heater is constructed in a manner which provides low thermal mass, thereby providing a fast response time for changes in temperature.

Abstract: In a system for testing drilling mud, a mixing tank and an aging vessel are hydraulically connected to supply drilling mud to a closed recirculating path through which mud is pumped to measuring instrumentation. The accumulator has a head which is removable for inspection and maintenance of the gas pressurized piston which pressurizes the drilling mud. The seals on the head are positioned to minimize wear.