Process for extracting liquid bitumens from an underground deposit

Claim 1

IN THE PROCESS OF EXTRACTING LIQUID BITUMENS FROM UNDERGROUND DEPOSITS THE PRESSURE OF WHICH EXCEEDS THE BUBBLE PRESSURE OF THE LIQUID BITUMENS, THE STEPS OF FORMING A PLURALITY OF BORES INTO THE UNDERGROUND DEPOSIT OF LIQUID BITUMENS, EXTRACTING THE LIQUID BITUMENS FROM BORES INTO THE HIGHEST PORTIONS OF THE DEPOSITS, FLOODING WATER THROUGH OTHER BORES INTO THE DEEPEST PORTIONS OF THE DEPOSIT SIMULTANEOUSLY WITH THE EXTRACTING OF THE LIQUID BITUMENS TO MAINTAIN A PRESSURE ON THE LIQUID BITUMENS WHICH IS GREATER THAN THE BUBBLE PRESSURE THEREOF, WITHDRAWING LIQUID BITUMENS DERIVED FROM THE DEPOSIT FROM BORES IN AN INTERMEDIATE ZONE BETWEEN THE FLOODING AND EXTRACTING BORES, HEATING THE WITHDRAWN BITUMENS AND RECIRCULATING THE SO HEATED BITUMENS THROUGH OTHER BORES LOCATED BETWEEN SAID FLOODING AND EXTRACTING BORES INTO THE DEPOSIT TO HEAT THE SAME, SAID RECIRCULATING CONTINUED TO HEAT THE DEPOSIT IN THE INTERMEDIATE ZONE TO RELEASE SUBSTANTIALLY ALL THE LIQUID BITUMENS FROM SAID DEPOSIT WHEREBY SUBSTANTIALLY ALL OF SAID LIQUID BITUMENS IS RECOVERABLE.