Abstract: A cast virgin TEFLON liner is provided for steel test cylinders used in thermal testing of a sample of drilling mud or additives. The liner has a hollow cylindrical body closed at one end and open at the other. A disc-shaped lid fits inside the open end of the liner and an elastomeric o-ring makes a tight seal between the liner and lid. A threaded hole in the center of the lid is closed with threaded plug. The apparatus includes a threaded metal tool or puller with T-shaped handle, for removing the liner from the test cylinder, and also for removing the lid from the liner. An internal air passageway in the puller from a first opening in the tip end of the puller to a second opening on one side of the shaft allows the lid to be removed from the liner without creating a vaccum in the space between the sample and the lid.

Abstract: A pressure vessel comprises a cylindrical container with a closed end, externally threaded at an open end, and having an O-ring seal in the end surface of the container side wall. A cylindrical disk closes the open end of the container and has a raised neck portion surrounded by a recessed cavity having a rupture disk therein. An internally threaded cap memeber has a hole through its end wall through which the raised neck extends and forms an annular passageway therebetween, and has an enlarged diameter on its side wall above the threaded portion to provide an annular passageway surrounding the disk circumference. The cap is screwed on the container over the cylindrical disk with the disk neck portion extending through the hole in the cap, and when hand tightened thereon compresses the disk on the O-ring to seal the container and isolate the threaded cap connection. The raised neck has an internally threaded bore and a valve seating surface for connecting the container with pressurizing apparatus.

Abstract: An oven for testing fluid samples to determine the effects of temperature and various chemical additives on the rheological, filtration and chemical properties of the sample under simulated circulating conditions comprises an environmental chamber having therein a plurality of motorized roller members which rotatably support a cylindrical enclosure containing a fluid sample. A heating element disposed beneath the rollers heats the chamber to a predetermined temperature which is maintained by a thermostat. An instrumentation and control panel disposed atop the chamber contains a digital thermometer display which eliminates the need to open the oven to check the temperature. A timer contained within the instrumentation and control panel may be preset to start and end the test automatically without having an operator in constant attendance.