| 摘要 |
A method and apparatus for testing subsurface formations, particularly a formation having a permeability less than about 10 millidarcies is disclosed. The test is made by use of a down hole test tool designed in such a way as to control the decompression of the fluid as it enters the tool. The formation characteristics are determined by analyzing the pressure versus time plot resulting from the test. Such characteristics as flow rate of liquid phase mud through the mud cake, formation permeability, formation pressure, invasion diameter, and the extent of supercharging, can be determined. The entire test takes no longer than a few minutes, versus hours and sometimes days for more conventional techniques and test tools.
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