论文部分内容阅读
我队钻探施工的矿区地层比较复杂,几年来都是采用泥浆护壁.由于所使用的粘土和粘土粉含砂量甚高(有时高达25%),一旦钻具在孔内停留就会造成沉砂埋钻事故.针对这种情况,我们采用离心旋流除砂器取得了很好效果.离心旋流除砂器的结构如图.其工作原理是利用离心力作用将泥浆中的砂粒甩向器壁,沉淀后从底部出砂咀排出,经净化的泥浆从上部溢流管流入水源箱内.经除砂器除砂后的泥浆含砂量可降至4%以下,改善了泥浆的性能,减少了沉砂埋钻的危险性.例如有一钻孔在478米深处发生了孔内事故,经48小时后,反回钻杆时,没有发生以往的那种沉埋现象,大大缩短了处故时间.
The mines that I drilled in the formations are more complex and have used mud barriers for years, and because of the high sand content (sometimes up to 25%) of the clay and clay powders used, settling of the drill once inside the hole will result in gritting Buried drilling accident.In response to this situation, we use the centrifugal cyclone desander achieved good results. Centrifugal cyclone desander structure shown in Figure 1. Its working principle is the use of centrifugal force to the mud in the mud thrown to the wall , Precipitated from the bottom of the sand exit, the purified mud from the top of the overflow pipe into the water tank.Deter sand sand removal capacity can be reduced to below 4%, to improve the performance of the mud and reduce For example, a drill hole at 478 meters deep in the hole occurred in the accident, after 48 hours, the drill pipe back, did not occur in the past, the kind of burial, greatly reducing the accident time.