Oil well cementing process and apparatus therefor

Claim 1

IN A PROCESS FOR CEMENTING A WELL COMPRISING A STRING OF WELL CASING IN A WELL HOLE IN A GAS PRODUCING FORMATION, THE IMPROVEMENT WHICH COMPRISES PLACING A CEMENTITIOUS LIQUID MIXTURE BETWEEN THE CASING STRING AND THE WELL HOLE AND CONTINUOUSLY KNEADING THE CEMENTITIOUS LIQUID MIXTURE AFTER IT IS IN PLACE IN THE SPACE BETWEEN THE CASING AND THE WELL HOLE PRIOR TO THE SETTING OF SAID MIXTURE BY ROTATING SAID CASING AND TRANSMITTING WEIGHT OF THE CASING BY KNEADING MEANS ATTACHED TO SAID CASING, TO EACH PORTION OF SAID CEMENTITIOUS LIQUID MIXTURE IMMEDIATELY ADJACENT THE CASING AND MOVING THE SAID PORTIONS OF KNEADED EMENTITIOUS LIQUID MIXTURE FROM ADJACENT KNEADING MEANS IN AN UNOBSTRUCTED PATH OUTWARD FROM SAID CASING TOWARD SAID WALL AND BACK INWARD TO SAID CASING, RELEASING GAS FROM SAID CEMENTITIOUS LIQUID AND PASSING ALL SAID RELEASED GAS UPWARD IN SAID SPACE, AND THE SAID KNEADING IS PERFORMED BY A SERIES OF SOLID RIGID LATERALLY EXTENDING IMPERFORATE SPIRAL EXTENSIONS, FIRMLY ATTACHED TO A PORTION OF SAID WELL CASING AND SAID SPIRAL EXTENSIONS EACH EXTENDING LATERALLY OF THE CASING WITH A PITCH THAT IS AT THE SAME ANGLE TO THE AXIS OF THE WELL CASIN, WHEREBY THE KNEADING ACTION IS SIMILAR THROUGHOUT SAID LIQUID DURING SAID ROTATION AND THE ROTATION OF SAID EXTENSIONS IN SAID CEMENTITIOUS LIQUID PRIOR TO ITS SETTING IS IN THE DIRECTION IN WHICH ALL SAID EXTENSIONS PRESENT A SIMILARLY DOWNWARDLY FACING IMPERFORATE SURFACE, AND SAID EXTENSIONS REACH LESS THAN THE FULL DISTANCE FROM THE OUTSIDE SURFACE OF THE CASING TO THE INTERNAL DIAMETER OF THE WELL HOLE.