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ZK302孔的地质情况及处理1984年6月施工的ZK302孔，由于断裂构造穿插，有三层共18.12米破裂带的粗砂岩、砂砾岩。在钻进中，泥浆不上返，漏失严重，我们用以下三种方法处理。1．加稠原浆粘度，降低失水量钻进到397.88米处，发现所用的PAM低固相冲洗液不上返，顶水钻进到399米，提钻倒出岩心，呈破裂状粗砂岩及砂砾岩。随即将泥浆加土量由4％增大到6％，PAM加量由100ppm增加到300ppm，粘度达到24秒，失水量降低到3cc/30分。下钻由399.00米钻进到402.42米，进尺3.42米，仍不返水、提钻另想堵漏方法。
ZK302 Hole Geological Conditions and Treatment The ZK302 hole, constructed in June 1984, has three layers of coarse sandstone and conglomerate with a total length of 18.80 meters of rupture. In the drilling, the mud does not go back, serious loss, we use the following three methods. 1. Thickening the viscosity of the original puree, reducing water loss into the 397.88 meters and found that the use of PAM low solid phase flushing did not return, the top water drilling 399 meters, extracted from the core drilling, was rupture coarse sandstone and glutenite . Immediately increase the amount of mud from 4% to 6%, PAM dosage increased from 100ppm to 300ppm, the viscosity reached 24 seconds, water loss decreased to 3cc / 30 minutes. Drill down from 399.00 meters to 402.42 meters, footage into 3.42 meters, still not back to water, drilling drilling another way to plug.