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...http://www.google.de/patents/US5095745?utm_source=gb-gplus-sharePatent US5095745 - Method and apparatus for testing subsurface formations
