Method of producing wells without plugging of tubing string

Claim 1

IN A METHOD OF PREVENTING HYDRATE FORMATION AND SULFUR PLUGGING IN TUBING STRING OF A PRODUCTION WELL WHICH EXTENDS FROM GROUND LEVEL TO AN UNDERGROUND PRODUCING ZONE FOR THE PRODUCTION OF A SULFUR-CONTAINING FLUID FROM SAID ZONE, SAID METHOD COMPRISING: (A) FLOWING SAID SULFUR-CONTAINING FLUID FROM THE PRODUCING ZONE UPWARDLY THROUGH SAID PRODUCTION TUBING STRING; AND, (B) INJECTING INTO SAID PRODUCTION TUBING STRING, THROUGH AN INJECTION TUBING STRING IN COMMUNICATION WITH SAID PRODUCTION TUBING STRING, AT A PONINT WHERE SULFUR AND HYDRATE DEPOSITION IN THE TUBING STRING TEND TO FORM DUE TO TEMPERATURE AND PRESSURE DROP IN THE TUBING STRING, A HOT SULFUR-FREE FLUID MISCIBLE WITH SULFUR, SAID FLUID BEING AT A TEMPERATURE ABOVE ABOUT 100*F. AND AT A PRESSURE SUFFICIENT TO PREVENT SULFUR PRECIPITATION AND SOLIDIFICATION ON THE TUBING STRING WALL.