Method and device for monitoring rock compressive strength and drillability

Abstract

The invention provides a method for monitoring rock compressive strength and drillability. The method comprises the steps of collecting well bore structure data, drilling tool combination data, rock compressive strength data, rock drillability data, logging data, well track measurement data and drill bit information of adjacent wells of a to-be-drilled well; performing calculating to obtain well bottom bit pressure corresponding to each depth point of each adjacent well near the to-be-drilled well; constructing a feature set, aligning features in the feature set to the same depth axis, and randomly disrupting a data set according to the depth; determining hyper-parameters of a random forest regression device, and training and building a rock compressive strength prediction model and a rock drillability prediction model; and collecting real-time logging data of the to-be-drilled well, and inputting the real-time logging data into the built rock compressive strength prediction model and rock drillability prediction model to realize real-time calculation of the rock compressive strength and drillability of the to-be-drilled well. According to the method, a mapping relation between various factors and the rock compressive strength and drillability is comprehensively considered, and the higher calculation precision is achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method and device for monitoring rock compressive strength and drillability. Background technique [0002] Real-time monitoring of geological information at the drill bit during oil drilling is of great significance for the optimization of drilling construction parameters, formulation of drilling measures, and optimization of drilling tools. At present, the evaluation of formation rock strength and drillability mainly relies on the real-time interpretation of acoustic logging while drilling data. However, due to the high price of measuring instruments or high service costs, non-critical wells or non-reservoirs are generally not equipped with logging while drilling tools. Get real-time data on rock strength and drillability. [0003] The traditional bottomhole rock strength characterization based on mud logging parameters is mainly based on analy...

AI Technical Summary

Problems solved by technology

At present, the evaluation of formation rock strength and drillability mainly relies on real-time interpretation of acoustic logging while drilling data. However, due to the high price of measuring instruments or high service costs, non-critical wells or non-reservoirs are generally not equipped with logging while drilling tools. Get real-time data on rock strength and drillability

[0003] The traditional bottomhole rock strength characterization based on mud logging parameters is mainly based on analytical formulas, with fewer considerations, mainly WOB, rotational speed, and bit size, and ignores the influence of friction on bottomhole WOB during drilling, resulting in calculation Low accuracy, especially not suitable for rock strength and drillability monitoring in deep wells, directional wells and horizontal well sections

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