Patent ID: 6832654
Filing Date: 2004-12-21
Classification: E21B

Abstract:
A bottom hole assembly for use with coiled tubing for fracturing a zone in a wellbore having a casing, comprising:a hollow mandrel functionally associated with the coiled tubing, the mandrel surrounded by an outer housing, the outer housing and the casing forming an annulus therebetween; an upper packing element; a lower packing element, the upper and lower packing elements disposed around the outer housing such that the packing elements are capable of straddling the zone to be fraced and are capable of setting the bottom hole assembly in the casing when the elements are set; an upper dump port in the outer housing, the upper dump port placing the annulus and a flow path within the hollow mandrel in fluid communication when an upward force is applied to the mandrel via the coiled tubing to deflate the upper and lower packing elements; a timing mechanism to ensure the fluid communication continues for a predetermined time to prevent the dump port from closing before the bottom hole assembly is flushed; and a spring biasing the mendrel such that the dump port prevents the annulus and flow path from being in fluid communication.