Changes

==Capillary test procedure==

==Capillary test procedure==

[[file:predicting-reservoir-system-quality-and-performance_fig9-11.png|thumb|{{figure number|1}}Example of a mercury capillary pressure test.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-11.png|300px|thumb|{{figure number|1}}Example of a mercury capillary pressure test.]]

In a mercury capillary pressure test, a rock with a measured [[porosity]] is immersed in a mercury pressure cell. The pressure in the cell is raised to a predetermined pressure level (P1, [[:file:predicting-reservoir-system-quality-and-performance_fig9-11.png|Figure 1]]). When the cell comes to equilibrium, the volume of injected mercury is measured (V2). Since the porosity of the test sample is known prior to the test, the volume of injected mercury can be converted to the percent of the total pore volume filled with mercury (for example, 10% at [[pressure::10 psi]] for point M1). All the pores filled with mercury at this point in the test have at least one 10μ pore throat radius or larger and represent 10% of the sample's pore volume. This procedure is repeated several more times at different pressures (for example, points M2 through M5).

In a mercury capillary pressure test, a rock with a measured [[porosity]] is immersed in a mercury pressure cell. The pressure in the cell is raised to a predetermined pressure level (P1, [[:file:predicting-reservoir-system-quality-and-performance_fig9-11.png|Figure 1]]). When the cell comes to equilibrium, the volume of injected mercury is measured (V2). Since the porosity of the test sample is known prior to the test, the volume of injected mercury can be converted to the percent of the total pore volume filled with mercury (for example, 10% at [[pressure::10 psi]] for point M1). All the pores filled with mercury at this point in the test have at least one 10μ pore throat radius or larger and represent 10% of the sample's pore volume. This procedure is repeated several more times at different pressures (for example, points M2 through M5).