65 The following data are available for the end trim of a ch

6.5

The following data are available for the end trim of a chalk core plug sample: Sg = 5%, So= 48%, and Sw = 47% grain = 2.713 g/ft3 = 38.31% Additional data include gas, oil, and water of densities 0.001, 0.8532, and 1.0351 g/ft3, respectively. The bulk volume of the core plug sample (in a preserved state), from which the end trim was taken, is 65.91 ft3, and its measured weight (trimless) is 133.0 g. No additional data are available for the core plug sample. Perform anassessment check to evaluate if the end trim data are also valid for the core plug, so that the core plug sample can be either used or discarded for SCAL tests. Please report the difference in %

Solution

A plug, or sample, taken from a conventional core for analysis. Core plugs are typically 1 in. to 1 1/2 in. [2.5 to 3.8 cm] in diameter and 1 in. to 2 in. [5 cm] long. Core plugs are ordinarily cut perpendicular to the axis of the core or parallel to the axis, called horizontal and vertical plugs, respectively, when cut from a vertical wellbore. The terms horizontal and vertical are often applied for cores cut from a deviated or horizontal wellbore, even though they are not strictly correct unless core orientation is measured and plugs are cut to the true in-situ orientation