53rd U.S. Rock Mechanics/Geomechanics Symposium,
New York City, New York
2019. American Rock Mechanics Association
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ABSTRACT: Elastic properties of rocks including Young's modulus and Poisson's ratio, in specific, are the main parameters, which are needed for design of hydraulic fracturing geometry, estimation of stimulated hydraulic fracture volume, sanding prediction and design of gravel pack and many other applications. Conventionally, the elastic properties are estimated from the compression and shear sonic and density logs, due to the intrinsic relationship of the sonic velocity and density with rock stiffness, then, calibrated against the core data taken at some depths. However, the use of any correlation is subjected to several shortcomings, including the fact that they cannot be generalized and in many cases quality cores are not available to conduct the calibration. In this study, we used the Artificial neural network (ANN) to estimate the elastic properties of the Bakken Formation. A total of 240 core samples from eight wells drilled into Upper, Middle and Lower Bakken were used. Bulk density, compressional and shear velocities, and porosity were the main parameters used for training purposes. The results indicated that an optimized ANN model is capable of predicting the elastic properties better than existing correlations using different technics in optimization and agreement study.
The economic conditions of the hydrocarbon exploration and production (E&P) industry today impose some challenges related to well design and placement, well completion, fracturing job and reservoir production systems (Fjaer, E. et al. 1992). The accuracy and level of certainty of the input data will have a significant impact on the model output parameters. Here, the rock mechanical properties including elastic properties (Young's modulus, shear modulus, bulk modulus, and Poisson's ratio) and strength properties (fracture gradient and formation strength) are the important parameters to be estimated.
Elasticity is the property of a material to resist deformation in volume or shape. Hooke's law describes the behavior of elastic materials and states that for small deformations, the resulting strain is proportional to the applied stress (Ugural et al 2003).
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