Permanent well completion method

Claim 1

A METHOD FOR COMPLETING AND SERVICING A CASED WELL IN WHICH A TUBING STRING IS PERMANENTLY ARRANGED IN A CASING WITH ITS LOWER OPEN END AT A LEVEL ABOVE THE HIGHEST OF A PLURALITY OF HYDROCARBON PRODUCTIVE STRATA WITHOUT KILLING THE WELL WHICH COMPRISES OBTAINING PRODUCTION OF HYDROCARBONS FROM A FIRST INTERVAL IN SAID CASING UNTIL PRODUCTION OF SAID HYDROCARBONS DECLINES, LOWERING A MOVABLE BARRIER THROUGH SAID TUBING, PLACING SAID BARRIER AT A LEVEL IN SAID CASING ABOVE SAID FIRST INTERVAL BUT BELOW A SECOND HYDROCARBON PRODUCTIVE INTERVAL, OBTSTRUCTING SAID CASING WITH SAID BARRIER TO TERMINATE PRODUCTION FROM SAID FIRST INTERVAL, LOWERING A PERFORATOR THROUGH SAID TUBING TO A LEVEL ADJACENT SAID SECOND INTERVAL, PERFORATING SAID CASING IN SAID SECOND INTERVAL WITH SAID PERFORATOR AND OBTAINING PRODUCTION OF HYDROCARBONS FROM SAID SECOND INTERVAL, MOVING SAID BARRIER FROM SAID LEVEL ABOVE SAID FIRST INTERVAL, PLACING SAID BARRIER AT A LEVEL ABOVE SAID SECOND INTERVAL BUT BELOW A THIRD HYDROCARBON PRODUCTIVE INTERVAL OBSTRUCTING SAID CASING WITH SAID BARRIER TO TERMINATE PRODUCTION FROM SAID SECOND INTERVAL, LOWERING SAID PERFORATOR THROUGH SAID TUBING TO A LEVEL ADJACENT SAID THIRD INTERVAL, AND THEN PERFORATING SAID CASING IN SAID THIRD INTERVAL AND OBTAINING PRODUCTION OF HYDROCARBONS FROM SAID THIRD INTERVAL, THE PERFORATIONS IN ALL OF SAID INTERVALS REMAINING OPEN INTO THE WELL SAID MOVABLE BARRIER OBSTRUCTING FLOW FROM THE FIRST INTERVAL WHILE PRODUCTION IS BEING OBTAINED FROM THE SECOND INTERVAL AND SAID MOVABLE BARRIER OBSTRUCTING FLOW FROM THE FIRST AND SECOND INTERVALS WHILE PRODUCTION IS BEING OBTAINED FROM THE THIRD INTERVAL.

Claim 2

A METHOD FOR COMPLETING AND SERVICING A CASED WELL IN WHICH A TUBING STRING IS PERMANENTLY ARRANGED IN A CASING WITH ITS LOWER OPEN END AT A LEVEL ABOVE THE HIGHEST OF A PLURALITY OF HYDROCARBON PRODUCTIVE STRATA WITHOUT KILLING THE WELL WHICH COMPRISES OBTAINING PRODUCTION OF HYDROCARBONS FROM A FIRST INTERVAL IN SAID CASING UNTIL PRODUCTION OF SAID HYDROCARBONS DECLINES, LOWERING A MOVABLE BARRIER THROUGH SAID TUBING, PLACING SAID BARRIER AT A LEVEL IN SAID CASING ABOVE SAID FIRST INTERVAL BUT BELOW A SECOND HYDROCARBON PRODUCTIVE INTERVAL, OBTSTRUCTING SAID CASING WITH SAID BARRIER TO TERMINATE PRODUCTION FROM SAID FIRST INTERVAL, LOWERING A PERFORATOR THROUGH SAID TUBING TO A LEVEL ADJACENT SAID SECOND INTERVAL, PERFORATING SAID CASING IN SAID SECOND INTERVAL WITH SAID PERFORATOR AND OBTAINING PRODUCTION OF HYDROCARBONS FROM SAID SECOND INTERVAL, MOVING SAID BARRIER FROM SAID LEVEL ABOVE SAID FIRST INTERVAL, PLACING SAID BARRIER AT A LEVEL ABOVE SAID SECOND INTERVAL BUT BELOW A THIRD HYDROCARBON PRODUCTIVE INTERVAL OBSTRUCTING SAID CASING WITH SAID BARRIER TO TERMINATE PRODUCTION FROM SAID SECOND INTERVAL, LOWERING SAID PERFORATOR THROUGH SAID TUBING TO A LEVEL ADJACENT SAID THIRD INTERVAL, AND THEN PERFORATING SAID CASING IN SAID THIRD INTERVAL AND OBTAINING PRODUCTION OF HYDROCARBONS FROM SAID THIRD INTERVAL, THE PERFORATIONS IN ALL OF SAID INTERVALS REMAINING OPEN INTO THE WELL SAID MOVABLE BARRIER OBSTRUCTING FLOW FROM THE FIRST INTERVAL WHILE PRODUCTION IS BEING OBTAINED FROM THE SECOND INTERVAL AND SAID MOVABLE BARRIER OBSTRUCTING FLOW FROM THE FIRST AND SECOND INTERVALS WHILE PRODUCTION IS BEING OBTAINED FROM THE THIRD INTERVAL.