Method of recovering lost circulation occurring in production strata in wells

Claim 1

THE METHOD OF RECOVERING LOST CIRCULATION IN A DRILLING WELL WHEREIN THE CIRCULATION HAS BEEN LOST INTO A PRODUCTIVE STRATUM WHICH CONSISTS OF INTRODUCTING INTO THE CIRCULATION FLUID SCREENED SAND AND GRAVEL HAVING A MINIMUM SIZE LARGER THAN THE SIZE OF THE PERFORATIONS IN THE LINER SUBSEQUENTLY TO BE INSTALLED IN THE WELL, THEREAFTER INTRODUCING INTO THE CIRCULATION FLUID DIATOMACEOUS EARTH TO FROM A FILTER CAKE FOR THE DEPOSIT THEREON OF THE MUD SHEATH PRODUCED BY THE CIRCULATION FLUID AND ON COMPLETION OF THE WELL INSTALLING THE LINER AND BAILING DOWN THE WELL CAUSING THE MUD SHEATH AND DIATOMACEOUS EARTH TO ENTER THE LINER AND BE REMOVED FROMTHE WELL AND THE SAND AND GRAVEL TO BE RETAINED IN THE WELL BY THE LINER WHEREBY THE SAND AND GRAVEL LEFT IN THE WELL WILL NOT IMPEDE THE FLOW OF FLUID FROM THE PRODUCTIVE FORMATION INTO THE WELL.