油田预测钻速工作难于开展的原因是：地层岩石可钻性统计指标Ｋｄ＇测定困难。为此，提出采用岩石可钻性能量法指标Ｋｎ计算预测钻速的方法。通过现场反复试验，又提出修正预测误差的两个新概念──全井段地层可钻性曲线和钻这系数。现场预测钻速结果表明，采用该方法预测钻速与实际钻速比较接近，可满足工程实际需要。 The reason why oilfield prediction drilling speed is hard to carry out is as follows: the determination index Kd ’of formation rock drillability is difficult. Therefore, a method of calculating the predicted drilling rate by using the index Kn of rock drillability is proposed. Through field trial and error, two new concepts of correcting prediction error are proposed, which are the formative drillability curve and drilling coefficient of the whole well. The results of on-site prediction of drilling speed show that the method can predict that the drilling rate is close to the actual drilling rate, which can meet the actual needs of the project.