The method uses a tubular shaped and electrically conductive well casing that extends to a geological formation in an oil or gas well. The casing is used for both flowing fluid between the formation and the casing at the top of the well and for communicating data representative of a parameter in the...http://www.google.fr/patents/US4724434?utm_source=gb-gplus-shareBrevet US4724434 - Method and apparatus using casing for combined transmission of data up a well and fluid flow in a geological formation in the well
Method and apparatus using casing for combined transmission of data up a ...
