CALIBRATION OF A ONE-DIMENSIONAL MECHANICAL EARTH MODELS USING GEOMETRIC APPROXIMATION OF BOREHOLE BREAKOUTS

Abstract

Link for citation: Konoshonkin D.V., Rukavishnikov  V.V., Shadrin A.S., Antonov  A.E., Kupriyanova K.A. Calibration of a one-dimensional mechanical earth models using geometric approximation of borehole breakouts. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 7, рр. 102-110. In Rus. The relevance. Mechanical earth modeling is widely used in various fields of science and technology. In the oil and gas industry, one-dimensional mechanical earth models are used to analyze wellbore stability, to design hydraulic fracturing, to assess the probability of sand production with oil and gas flow, and as input data for three-dimensional mechanical earth models. One-dimensional mechanical earth models are very demanding on the volume and quality of the initial data, for example, when calibrating the model to define the uniaxial compression strength and horizontal stresses, borehole imager data are required, which are usually not recorded in all wells and in whole interval. At the same time, almost every well has caliper data. Therefore, solving the problem of calibration of a one-dimensional mechanical earth model using more accessible caliper data is an urgent problem, the solution of which will allow building calibrated geomechanical models for a larger number of wells. The main aim: to develop an approach for calibration of one-dimensional mechanical earth models based on well caliper data. Methods: geometric approximation, analysis of laboratory studies, as well as analytical methods for calculating the stress-strain state near the well wall. Results. The paper introduces the equations and the algorithm to define the stresses and uniaxial compression strength of rocks using geometric approximation of borehole breakouts according to caliper data in wells.