Generalized rock samples are those not specialized through subtyping. Small rock fragments retrieved from the shale shakers in the drilling mud return system. Preservation methods target mechanical stabilization, prevention of fluid loss, or reduced contamination and are based upon rock type, degree of consolidation, and fluid type. Incorrect practices in preservation cause further alteration of the core and its fluids, making the core even less representative of the formation. In the process of cutting a core and bringing it to the surface, the fluid content of the rock is altered by unavoidable changes in pressure and temperature. Full recovery of a conventional core is typically 30 feet in length.Ĭore preservation activities are an attempt to maintain a sample, prior to analysis, in the same condition as existed upon its removal from the core barrel. A rock sample obtained by drilling into the earth with a pipe conveyed hollow bit and core barrel.
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