为了有效解决低压漏失井的井下清砂问题，研究开发了一种具有钻进功能的捞砂泵。
To solve effectively the problem of sand removing in low-pressure absorption Wells, a drilling sand pump was developed.
捞砂筒为一个5英尺圆筒，它在大气压力下被下入井内。
The bailer is a 5-ft cylinder that is lowered into the well under atmospheric pressure.
为了解决上述问题，采用机械捞砂工艺技术，可以达到完全清出井内砂柱以及提高修井施工效益的目的。
The mechanical sand-bailing technology makes sand-washing operation more efficient. It can remove sand pinnacle completely and raise workover benefit.
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