Apparatus for logging well bores

Claim 1

WELL LOGGING APPARATUS FOR DETECTING THE PRESENCE OF A PETROLIFEROUS SUBSTANCE IN A WELL BORE PENETRATING AN EARTH FORMATION WHICH COMPRISES, INCOMBINATION, A BODY MEMBER ADAPTED TO BE LOWERED AND RAISED IN A WELL BORE; A PISTON ARRANGED IN A CYLINDER DEFINED BY SAID BODY MEMBER PROVIDED WITH A CUTTING MEMBER ADAPTED CUT A FILTER CAKE ON A WALL OF A WELL BORE AND TO CONTACT AN EARTH FOMATION; A DEFORMABLE BAG MEMBER ADAPTED TO CONTAIN A FLUID OXIDIZING AGENT AND ARRANGED WITHIN SAID BODY MEMBER IN A CAVITY THEREOF EXPOSED TO WELL PRESSURE; A CONDUIT CONNECTING SAID BAG MEMBER TO SAID PISTON CYLINDER ADJACENT A FREE END OF SAID PISTON; ACTUATING MEANS FOR MOVING SAID PISTON INTO AND OUT OF CONTACT WITH SAID FORMATION TO OPEN AND CLOSE SAID CONDUIT AND TO RELEASE OXIDIZING AGENT INTO CONTACT WITH SAID FORMATION; A THERMOCOUPLE CARRIED BY THE BODY MEMBER ADJACENT THE FREE END OF SAID PISTON DETECT A TEMPERATURE RISE CAUSED BY REACTION OF SAID OXIDIZING AGENT WITH SAID PETROLIFEROUS SUBSTANCE; MEANS FOR POSITIONING SAID BODY MEMBER AGAINST A WALL OF THE WELL BORE; AND SUSPENDING MEANS FOR LOWER ING AND RAISING SAID BODY MEMBER ATTACHED TO AN UPPER END OF SAID BODY MEMBER.