This invention relates to a collecting device (1) for loosening and collecting particulate material from a well. The device includes a first end portion and a second end portion; a feed pipe (6) in the first end portion; a collecting container (8) including at least one container section (10), between the feed pipe (6) and the second end portion. A conveyor (18), in the feed pipe (6), moves the particulate material in toward the collecting device (1). The device further includes a tool (20) at the leading end portion of the conveyor (18) and a fluid outlet (38) at the second end portion; a mono pump (12) driven by a motor (22); and at least one container section (10) in a flow path (40) on the pressure side of the mono pump (12). A method for loosening and collecting particulate materials from a well by means of the collecting device (1) is described as well.