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通过在室内模拟气体钻井条件下泥页岩地层的温度和压力,分别对气体钻井钻遇地层出水条件下的水侵规律和气体钻井转水基钻井条件下的水侵规律进行实验研究,并建立相应条件下的水侵距离与时间的关系,从而对相应条件下泥页岩地层的水侵范围和坍塌范围进行预测,分析这2种情况下水侵距离与时间的关系。结果表明两者均呈现出初期水侵速度较快、中后期逐渐变缓的特征。对比2种情况下的水侵距离与时间的关系,前者的水侵速度要比后者的水侵速度慢得多,同样水侵穿透5 cm的距离时,前者所用时间是后者的350倍左右。
By simulating the temperature and pressure of shale formation under gas drilling conditions in laboratory, the water intrusion law under the conditions of water breakthrough in gas drilling and the water invasion under gas drilling conditions are experimentally studied and established Under the corresponding conditions, the relation between water intrusion distance and time is predicted, and then the water invasion range and collapse range of shale formation under the corresponding conditions are predicted. The relationship between water invasion distance and time under these two conditions is analyzed. The results show that both of them show the characteristics of rapid water intrusion and slowing in the middle and late stages. Comparing the relationship between water intrusion distance and time in the two cases, the former has a much slower rate of water intrusion than the latter, and the same time the water penetrated 5 cm, the latter used 350 Times or so.