Improving the efficiency of development of a group of deposits in Central Asia based on a geological geomechanical model

UDK: 622.276.1/.4(4/9)
DOI: 10.24887/0028-2448-2019-6-41-45
Key words: geomechanical parameters, geological geomechanical model, finite element method, permeability, hydraulic fractures
Authors: Yu.A. Kashnikov (Perm National Research Polytechnic University, RF, Perm), D.V. Shustov (Perm National Research Polytechnic University, RF, Perm), A.E. Kukhtinskii (Perm National Research Polytechnic University, RF, Perm), A.P. Ermilov (LUKOIL Uzbekistan Operating Company LLC, Uzbekistan, Tashkent), S.V. Vasutkin (LUKOIL Uzbekistan Operating Company LLC, Uzbekistan, Tashkent)

The main focus of this work is on the development of a geological and geomechanical model of a group of gas-condensate fields in Central Asia for solving development problems, primarily hydraulic fracture design. The model is based on the results of determining the geomechanical characteristics of productive layers, as well as the parameters of the in-situ stress field. The dependencies between the static and dynamic parameters were established as a result of the experiments conducted. In particular, the dependences of the static elastic modulus, the uniaxial compressive strength, the Biot parameter on the P-wave velocity are obtained. The dependence of the static Poisson ratio on the X-ray logging parameter, which characterizes its relationship with the shaliness of rocks, is established. The parameters of the Hoek – Brown criterion are given. The results of determining the Biot and Skempton parameters as well as the coefficient of fracture toughness are presented. The main goal of the geological and geomechanical model is to obtain components of the stress tensor of the productive object and the rocks surrounding it, based on the mechanical properties obtained from the results of well logging and 3D seismic data, as well as testing samples. The components are then linked with the hydrodynamic studies of wells and parameters of field development. Subsequently, on the basis of the obtained values of the stress tensor and the values of the mechanical properties of the productive layer, it is possible to optimize the parameters of the hydraulic fracturing, to decide whether to use a hydraulic fracturing with proppant or acid fracturing. In addition, it becomes possible to predict the positions of compacted and decompacted zones and, accordingly, highly productive zones based on the use of established correlations.


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