Capillary-based calibration standards for measurement of permeability

摘要

A calibration standard or check plug provides calibration standards in the permeability range of 10-10,000 nanoDarcy. The check plug is of similar exterior dimensions to a core sample that would be used with existing permeameters. The check plug is constructed from an impermeable material that is insensitive to moisture. The check plug has one or more channels of known diameter from which the permeability may be calculated. Methods for use thereof and methods of manufacture thereof are also disclosed.

主权项

1. A method of creating a check plug of known permeability comprising:
creating a cylinder with a diameter D with an impermeable matrix; creating a channel in the cylinder by:
forming a passage in the cylinder;attaching a glass capillary tube containing the channel within the passage; andsealing the annulus between the passage and the glass capillary tube, wherein the channel has a known diameter d of less than 50 microns; and calculating the permeability through the check plug by the equationkeffective=nd432⁢D2, wherein n is the number of channels.