针对煤层气定向井漏失大冲砂难返出,采取常规捞砂工艺实施,施工中捞砂出现无进尺、捞后砂体漏失问题,现场通过对捞砂铲改进,增加弹簧、加大限位距离、底部倒锥面滤网分选阻隔、使用双凡尔球座,经过6井次的实践,在延川南工区获得实际成效,提高了该工艺在地层漏失大斜度井运用的可靠性。 Aiming at the situation that large red sand of directional well leakage in coalbed methane is hard to come back out, conventional sand-fishing process is adopted to carry out. During the construction, there is no problem of missing footage and the loss of sand body after fishing. The scene is improved by sand-shovel, Distance, the bottom of the inverted cone mesh filter barrier, the use of double-Sphere ball seat, after 6 well practice, in Yanchuan South work area to obtain the actual results to improve the process of leakage in the formation of high-deviated well reliability.