An experiment is described in which the compressibility of a 30–40-mesh sand was measured at pressures up to 3,000 pounds per square inch. There was only a 2 per cent change in pore volume between no load and full load. Since the sand used in the experiment was unconsolidated, the compressibility of even a slightly consolidated sand should be much less, and it is apparent that compressibility of a sand is, in general, a minor factor in oil production.

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