A test tool including a locking device and a sleeve valve with a recording instrument attached, for use in testing wells as for the purpose of gathering data for reservoir evaluation, the test tool is installed in a landing receptacle in a well and, preferably near the reservoir to be evaluated, the...http://www.google.es/patents/US4669537?utm_source=gb-gplus-sharePatente US4669537 - Well test tool and system
