Automatic fill-up and cementing devices for well pipes

Claim 1

A FILL-UP DEVICE INCLUDING, A TUBULAR BODY HAVING MEANS FOR CONNECTING SAID BODY IN A WELL PIPE STRING, SAID BODY HAVING AN ORIFICE ESTABLISHING COMMUNICATION BETWEEN THE EXTERIOR AND INTERIOR THEREOF WHEREBY FLUID FROM THE ANNULUS SURROUNDING THE BODY AND PIPE STRING MAY FLOW THROUGH THE ORIFICE AND INTO THE STRING, AN ANNULAR ELEMENT MOUNTED FOR MOVEMENT WITHIN THE BODY AND MOVABLE TO A POSITION CLOSING FLOW INTO THE PIPE STRING, SAID ANNULAR ELEMENT BEING SUBJECTED TO THE PRESSURE OF THE FLUID FLOWING THROUGH SAID ORIFICE INTO THE PIPE STRING, MEANS FOR SUBJECTING SAID ANNULAR ELEMENT TO THE STATIC PRESSURE IN SAID ANNULUS SURROUNDING SAID BODY IN OPPOSITION TO THE PRESSURE OF THE FLUID FLOWING THROUGH SAID ORIFICE INTO THE PIPE STRING WHEREBY DIFFERENTIAL PRESSURE IS CREATED ACROSS SAID ANNULAR ELEMENT, RELEASABLE MEANS FOR NORMALLY HOLDING SAID ANNULAR ELEMENT IN A POSITION ALLOWING FLOW THROUGH THE ORIFICE AND INTO THE PIPE STRING, SAID RELEASABLE HOLDING MEANS BEING RELEASED BY THE DIFFERENTIAL PRESSURE CAUSED BY A PREDETERMINED THE ORICREASE IN THE VELOCITY OF FLOW OF FLUID PASSING THROUGH SAID ORIFICE TO PERMIT MOVEMENT OF SAID ANNULAR ELEMENT, SAID DIFFERENTIAL PRESSURE ALSO MOVING SAID ANNULAR ELEMENT TO A POSITION CLOSING FURTHER FLOW INTO THE PIPE STRING, AND MEANS PERMITTING DOWNWARD FLOW THROUGH SAID TUBUBLAR BODY AND THROUGH THE CENTRAL PORTION OF SAID ANNULAR ELEMENT WHEREBY CIRCULATION MAY BE ESTABLISHED THROUGH SAID DEVICE TO THE ANNULUS SURROUNDING SAID BODY AND SAID WELL PIPE STRING.