Methods and apparatus for well completions

Claim 1

A METHOD OF PERFORATING A CASED WELL INTERMEDIATE OF THE LENGTH OF A TUBING STRING DISPOSED WITHIN A SUCH A CASED WELL, COMPRISING THE STEPS OF: LOWERING A FIRST RADIOACTIVE DEVICE IN THE TUBING STRING TO A POSITION INTERMEDIATE THE LENGTH OF THE TUBING STRING, LOWERING IN TO THE CASE WELL A TOOL HAVING A SECOND DIRECTIONAL RADIACTIVITY DEVICE, A WELL PERFORATOR, AN INDEXING DEVICE AND WALL ANCHOR MEANS WHERE THE SECOND DIRECTIONAL RADIACTIVITY DEVICE HAS A FIXED ANGULAR ORIENTATION RELATIVE TO THE DIRECTION OF FIRING THE WELL PERFORATOR TO THE WALL ANCHOR MEANS AND CONNECTS THE PERFORATOR TO THE WALL ANCHOR MEANS AND WHERE SAID FIRST AND SECOND RADIOACTIVITY DEVICES EMIT AND DETECT RADIOACTIVITY, POSITIONING THE SECOND RADIOACTIVITY DEVICE AND PERFORATOR AT A LEVEL CORRESPONDING TO THE POSITION TO THE FIRST RADIACTIVITY DEVICE, ATTACHING THE WALL ANCHOR MEANS IN THE CASED WELL RELATIVE TO THE WALL OF THE CASED WELL IN A FIXED NON-ROTATABLE POSITION, INDEXING THE PERFORATOR AND SECOND RADIACTIVITY DEVICE WITH RESPECT TO THE FIXED POSITION OF THE WALL ANCHOR MEANS THROUGH A 360* ARC WHILE DERIVING INDICATIONS OF THE INDEXED POSITION OF THE SECOND RADIOACTIVITY DEVICE RELATIVE TO THE RADIOAC-