A geological strata pressure intelligent drill soft measurement method

Abstract

The invention discloses a geological stratum pressure intelligent soft measurement while drilling method which comprises the following steps of collecting drilling data; analyzing the obtained drilling data; selecting the drilling data closely related to the stratum pressure by a Pearson correlation analysis method; performing normalization processing on the basis of obtaining a sample data set; building a stratum drillability model, a rock strength model and a hydro-mechanical specific energy model for respectively calculating intermediate parameters such as stratum drillability parameters, rock strength parameters and hydro-mechanical specific energy parameters; by using the sample data set and the intermediate parameters obtained through calculation as input, building a Bayesian linearmodel for calculating the pressure of the current located stratum of the drill bit; finally, judging the pressure type of the current stratum by a random forest method; and performing early warning ona pressure transition zone and the high-pressure stratum.

Description

technical field [0001] The invention relates to the field of intelligent control of the geological drilling process, in particular to an intelligent soft-measurement-while-drilling method for complex geological formation pressure. Background technique [0002] At present, my country's demand for bulk mineral products is still growing, the contradiction between supply and demand of existing resources is becoming increasingly prominent, and the degree of dependence on foreign countries is increasing. But in fact, my country's mineral resources are diverse and rich in reserves. With the continuous discovery of new mineral resources, deep geological exploration and development have become inevitable. [0003] Although the development potential of deep resources and energy is great, due to the harsh environment deep in the formation, the drilling process often encounters high temperature and formation pressure. Formation pressure is a basic parameter in the exploration and deve...

AI Technical Summary

Problems solved by technology

However, with the development of drilling technology (such as directional deviated well technology and the use of PDC bit), these two methods have obvious errors in pressure prediction and monitoring.

In addition, the traditional formation pressure monitoring method cannot adjust relevant parameters in real time according to the drilling environment, and the adaptability of the model is poor. Therefore, it is urgent to solve the method of pressure prediction and monitoring, and find a monitoring method while drilling that can be matched with comprehensive mud logging. Effectively guide scientific drilling and prevent accidents

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