Removal of cement from well casing

Claim 1

A METHOD FOR REMOVING A CEMENT PLUG AND THE LIKE FORM A WELL CASING HAVING A TUBING PERMANENTLY ARRANGED THEREIN WITH THE LOWER OPEN END OF THE TUBING AT A LEVEL SUBSTANTIALLY ABOVE THE LEVEL FROM WHICH CEMENT IS TO BE REMOVED WHICH COMPRISES FORCING A STREAM OF ACID SOLUTION DOWN THE TUBING TO CAUSE A JETTING ACTION DIRECTLY AGAINST THE UPPER FACE OF CEMENT PLUG TO DISINTERGRATE AT LEAST A PORTION OF SAID PLUG, MAINTAINING THE JETTING ACTION OF SAID STREAM OF ACID SOLUTION IN A FIXED SPACED RELATION WITH THE UPPER FACE OF SAID CEMENT PLUG AS IT IS DISTINTEGRATED, AND CIRCULATING SAID ACID SOLUTION UP THE ANNULUS BETWEEN THE CASING AND TUBING, RETURNING THE ACID SOLUTION FROM THE ANNULUS TO THE TUBING, AND THEN AGAIN FORCING THE ACID SOLUTION RETURNED TO THE TUBING DOWN THE TUBING AND DIRECTLY AGAINST THE UPPER FACE OF THE PLUG UNTIL AT LEAST A PORTION OF SAID PLUG HAS BEEN DISINTEGRATED AND THEN CIRCULATING SAID SOLUTION AND SAID DISINTEGRATED CEMENT FROM THE WELL.