Well treating apparatus

Claim 1

IMPROVED OIL WELL TREATING APPARATUS, WHICH APPARATUS COMPRISES, IN COMBINATION, CONTAINER MEANS WHICH INCLUDES A SINGLE VARIABLE VOLUME WELL TREATING FLUID INJECTION CHAMBER, PRESSURE RESPONSIVE MEANS FORMING A PART OF SAID CHAMBER IN SAID CONTAINER MEANS AND ADAPTED TO VARY THE VOLUME OF SAID CHAMBER IN RESPONSE TO PRESSURE VARIATIONS, A WELL TREATING FLUID SUPPLY LINES INTERCONNECTING SAID INJECTION CHAMBER AND A WELL TREATING FLUID SOURCE, VALVE MEANS CONTROLLING THE PASSAGE OF WELL TREATING FLUID FROM SAID SOURCE TO SAID INJECTION CHAMBER, A WELL TREATING FLUID OUTLET LINE INTERCONNECTING SAID CHAMBER AND THE ANNULUS OF A WELL TO BE TREATED WITH SAID WALL TREATING FLUID, VALVE MEANS DISPOSED IN SAID WELL TREATING FLUID OUTLET LINE BETWEEN SAID INJECTION CHAMBER AND SAID WELL ANNULUS, A FIRST PRESSURE-IMPARTING FLUID INLET LINE INTERCONNECTING SAID PRESSURE RESPONSIVE MEANS AND A PUMP-FREE SOURCE OF PRESSURE-IMPARTING FLUID EXTERNAL OF SAID WALL, VALVE MEANS DISPOSED IN SAID FIRST PRESSURE IMPARTING FLUID INLET LINE BETWEEN SAID PRESSURE RESPONSIVE MEANS AND SAID SOURCE OF PRESSURE-IMPARTING FLUID, A PRESSURE-IMPARTING FLUID OUTLET LINE CONNECTED TO SAID PRESSURE RESPONSIVE MEANS AND FLUID PRESSURE RELIEF MEANS CONNECTED TO SAID PRESSURE RESPONSIVE MEANS WHEREBY PRESSURE-IMPARTING FLUID IN CONTACT WITH SAID PRESSURE RESPONSIVE MEANS DCAN BE MOVED OUT OF CONTACT THEREWITH SO AS TO REDUCE PRESSURE IMPARTED TO SAID PRESSURE RESPONSIVE MEANS, A SECOND PRESSURE-IMPARTING FLUID INLET LINE INTERCONNECTING A PUMP-FREE SOURCE OF FLUID PRESSURE AND SAID WALL TREATING FLUID OUTLET LINE EXTERNAL OF SAID CONTAINER MEANS, WHEREBY SAID WELL TREATING FLUID IS CONTACTED WITH PRESSURE-IMPARTING FLUID AND AIS THEREBY URGED TOWARD SAID WELL ANNULUS, AND VALVE MEANS DISPOSED IN SAID SECOND PESSURE-IMPARTING FLUID INLET LINES, AND TIME MEANS MEANS INTERCONNECTED TO SAID VALVE MEANS AND TO SAID FLUID PRESSURE RELIEF MEANS AND ADAPTED TO INTERMITTENTLY ACTIVATE THE SAME, WHEREBY THE INTERMITTENT INJECTION OF A PREDETERMINED VOLUME OF SAID WELL TREATING FLUID INTO SAID ANNULUS IS EFFECTED.