Dump bailer and lubricator assembly for filling the dump bailer

A dump bailer for being filled with a flowable material in a lubricator assembly and for depositing the flowable material in a wellbore, the dump bailer having an elongated body with a longitudinal axis, said dump bailer comprises:

• an inlet and an outlet;
• a main chamber having a longitudinally displaceable sealing wiper plug and being divided by the longitudinally displaceable sealing wiper plug into an upper chamber and a lower chamber for containing the flowable material;
• a pump for pumping wellbore fluid to the upper chamber, the pump is positioned between a cable head and the main chamber;
• a first tensioned valve system positioned between the pump and the main chamber, the first tensioned valve system configured so that, when the pump is active, liquid communication between the pump and the upper chamber is open while liquid communication between the upper chamber and a port located in the dump bailer longitudinal body is closed, and when the pump is inactive, liquid communication between the pump and the upper chamber is closed while liquid communication between the upper chamber and the port is open;
• a second tensioned valve system positioned between a bottom of the main chamber and an outlet at a lower end of the dump bailer, the second tensioned valve system configured so that liquid communication between the lower chamber and the outlet of the dump bailer is open when the pump is active and closed when the pump is inactive;
• a filling valve at the bottom of the main chamber configured to allow the flowable material into the lower chamber while preventing flowable material from exiting the lower chamber through the filling valve;
• and
• a means for orientation of the dump bailer along a longitudinal axis within the lubricator assembly.