Positive Displacement Dump Bailer and Method of Operation

摘要

A dump bailer assembly includes a downhole power unit and a dump bailer body. A piston is disposed within the dump bailer body and is releasably coupled to a moveable shaft of the downhole power unit. An actuation assembly is disposed proximate a first end of the dump bailer body and a barrier is positioned proximate a second end of the dump bailer body. A wellbore agent is disposed within the dump bailer body between the barrier and the piston. In operation, the downhole power unit retracts the moveable shaft shifting the piston toward the first end and energizing the actuation assembly. Further operation of the downhole power unit releases the moveable shaft from the piston such that the energized actuation assembly shifts the piston toward the second end such that interaction between the piston and the wellbore agent opens the barrier and dispenses the wellbore agent.

主权项

1. A dump bailer assembly for use in a wellbore comprising:
a downhole power unit having a housing and a moveable shaft; a dump bailer body operably associated with the housing, the dump bailer body having first and second ends; a piston disposed within the dump bailer body, the piston releasably coupled to the moveable shaft; an actuation assembly disposed within the dump bailer body between the first end and the piston; a barrier operably associated with the dump bailer body and positioned proximate the second end; and a wellbore agent disposed within the dump bailer body between the barrier and the piston; wherein, operation of the downhole power unit retracts the moveable shaft shifting the piston toward the first end to energize the actuation assembly; wherein, continued operation of the downhole power unit releases the moveable shaft from the piston such that the energized actuation assembly shifts the piston toward the second end; and wherein, interaction between the piston and the wellbore agent opens the barrier and dispenses the wellbore agent from the dump bailer body.