Summary
A new method has been developed for coating oilfield core for laboratory studies. It consists of applying a steel coating and aluminum wraps around the outer surface of a core. The strength of the coating, the short time needed to apply it, and its low cost are the major advantages of this new method.
Introduction
Laboratory core studies are commonly conducted to evaluate reservoir rock properties. In the past, epoxy, wax, and plastic coatings of cores have been used conventionally to conduct experimental studies. Because of various problems, such as leakage or fractures even under low pressures in these and other conventional coatings, a new method of coating and mounting a reservoir rock core was investigated. This new method of core coating and mounting was tested for leaks, fractures, and pore invasion and was found not to have leaks or fractures or to invade pore spaces up to a test pressure of 400 psig [2758 kpa]. The cores were not tested for higher pressures, but these metal-coated cores are expected to withstand a pressure of about 1,000 psig [6895 kPa] safely. Experiments may also be conducted at high pressures ranging from 2,000 to 3,000 psig [ 13.8 to 20.7 MPa] with an increased number of coatings and uniformly tight mounting connections.
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