| 摘要 |
It has been given an account of a sand removing apparatus (2) for use in the lower area of underwater wells (1). The apparatus (2) which is intended to be suspended from the end of a pipe string, comprises, as known per se, a container (6) having a closeable inlet (12) for allowing a flow of liquid accompanied by sand (3) thereinto. It has been an object to increase the sand container's (6) degree of filling and, thus, capacity. To this end, 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. A special use for a liquid-driven jet pump (ejector) (5) is as drive device for such a sand removing apparatus (2).
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