At present, the method of formation pressure is mainly divided into pressure prediction before drilling, pressure monitoring while drilling, and post-drilling pressure detection. The drilling monitoring method and the post-drilling pressure detection method cannot predict the pressure value of the formation in front of the drill bit. The pre-drilling prediction method is used to predict pressure by seismic data, but the accuracy of the result is not high. How to infer the pressure information of complex and unknown drilling strata based on very limited known formation pressure information is the key technical problem to be solved in this paper. In order to solve this problem, a method based on grey theory is proposed to predict the formation pressure in front of the drill. The prediction results of formation pore pressure based on the method in this paper are compared with the monitoring results of formation pore pressure while drilling: the maximum error is 3.408%, and the average relative error is 3.038%, which indicates that the model has high accuracy. It can meet the requirements of field drilling construction. Through the research of this paper, it can provide more accurate pore pressure information of the formation to be drilled under the bit. Based on the pressure prediction results of the formation to be drilled, dynamic engineering risk assessment can be carried out, so as to assist the drilling operators to make quick and accurate decisions and prevent drilling risk caused by inaccurate understanding of pressure information.

中文翻译：

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基于灰色预测理论的钻头前孔压力预测

目前，地层压力的方法主要分为钻井前压力预测，钻井时压力监测和钻井后压力检测。钻井监测方法和钻井后压力检测方法不能预测钻头前面的地层压力值。预钻预测方法用于通过地震数据预测压力，但结果的准确性不高。如何基于非常有限的已知地层压力信息来推断复杂未知钻井层的压力信息是本文要解决的关键技术问题。为了解决这个问题，提出了一种基于灰色理论的预测钻头前方地层压力的方法。将基于该方法的地层孔隙压力预测结果与钻井时的地层孔隙压力监测结果进行比较：最大误差为3.408％，平均相对误差为3.038％，表明该模型具有较高的精度。准确性。可以满足野外钻探施工的要求。通过本文的研究，它可以提供更准确的钻头下面的地层孔隙压力信息。根据待钻地层的压力预测结果，可以进行动态工程风险评估，以协助钻井人员快速准确地做出决策，并防止因对压力信息的理解不正确而造成的钻井风险。