An apparatus for perforating a wall, such as the casing wall of a well hole, taking a sample of the fluids which may be behind the wall, and subsequently sealing the perforation so formed in the wall, wherein the perforating portion, the sampling portion and the sealing portion are operably...http://www.google.es/patents/US5765637?utm_source=gb-gplus-sharePatente US5765637 - Multiple test cased hole formation tester with in-line perforation, sampling and hole resealing means
Multiple test cased hole formation tester with in-line perforation, sampling ...
