| 摘要 |
A sand removing apparatus (2) for use in the lower area of underwater wells(1) is provided. The apparatus (2) which is intended to be suspended from the end of a pipe string, comprises a container (6) having a closable inlet (12) for allowing a flow of liquid accompanied by sand (3) thereinto. The container (6) has a separate outlet (11) assigned the suction side of a pump (5) constituting the drive device for the apparatus (2). The drive device is kept going until the degree of filling of the container (6) has been achieved. Between a separate inlet (12) provided with a one-way valve (13, 14) and said separate outlet (11), a filter (15) is disposed, counteracting that sand sucked into the container leaves the same again through a circulating flow together with the carrier liquid. One use for a liquid-driven jet pump (ejector) (5) is as a drive device for such a sand removing apparatus (2).
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