Collecting device for particulate material in a well and a method for collecting the particulate material and transporting it out of the well

A collecting device for loosening and collecting particulate material from a well, the collecting device comprising:

• a first end portion and a second end portion;
• a feed pipe with an inlet in the first end portion;
• a collecting container including at least one container section, between the feed pipe and the second end portion, said feed pipe being in fluid communication with the collecting container;
• a conveyor worm within the feed pipe, the conveyor worm being supported in an outer bearing housing and an inner bearing housing, the conveyor worm being arranged to move the particulate material in towards the collecting container;
• a tool at the leading end portion of the conveyor worm;
• a mono pump driven by a motor, said mono pump is positioned above the inner bearing housing and between the feed pipe and the second end portion such that the feed pipe is located on a suction side of the mono pump;
• a fluid outlet provided with an internal filter at the second end portion, such that the fluid outlet and the internal filter are located at a pressure side of the mono pump, said fluid outlet being in fluid communication with the collecting container;
• at least one of the at least one container section in a flow path through the collecting device on a pressure side of the mono pump;
• and
• at least one through-going inlet opening through a tubular wall at the suction side of the mono pump.