MULTIPLE DART DROP CIRCULATING TOOL BACKGROUND OF THE INVENTION

18 - MULTIPLE DART DROP CIRCULATING TOOL ABSTRACT 10047) A DOWNHOLE DEVICE USED TO DIVERT FLUID FLOW OUT OF A WORK STRING. NE DOWNHOLE DEVICE MAY BE LOCATED AT ANY POINT ALONG A WORK STRING AT WHICH IT MAY BE NECESSARY TO DIVERT THE FLUID 5 FLOW TO THE ANNULUS. THE DOWNHOLE DEVICE MAY BE ACTIVATED AND DEACTIVATED BY INSERTING A SINGLE DEFORMABLE DART INTO THE WORK STRING. THE DEVICE CATCHES THE DART BLOCKING FLUID FLOW THROUGH THE WORK STRING. INCREASED FLUID PRESSURE ACTIVATES THE DEVICE, WHICH DIVERTS THE FLUID FLOW OUT OF THE WORK STRING INTO THE ANNULUS. A LOCATING SLEEVE WITH A CONTINUOUS J-TRACK ALLOWS THE DEVICE TO BE RETAINED IN ACTIVATED POSITION. THE DART IS ADAPTED TO DEFORM UNDER A PREDETERMINED AMOUNT OF 10 FLUID PRESSURE ALLOWING THE DART PAST THE DEVICE AND RETURNING FLUID FLOW THROUGH THE WORK STRING. THC DOWNHOLE DEVICE MAY BE ACTIVATED MULTIPLE TIMES WITHOUT REMOVING THE DOWNHOLE DEVICE FROM THE WELLBORE.