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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.

References

1. Ganaeva M.R., Sukhodanova S.S., Khaliulin Ruslan R., Khaliulin Rustam R., Sakhalin offshore oilfield hydraulic fracturing optimization by building a 3D geomechanical model (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 6, pp. 108–111.

2. Hiroki Sone, Mechanical properties of shale gas reservoir rocks and its relation to the in-situ stress variation observed in shale gas reservoirs, PhD thesis, 2012.

3. Shustov D.V., Kashnikov Yu.A., Ashikhmin S.G., Kukhtinskiy A.E., 3D geological geomechanical reservoir modeling for the purposes of oil and gas field development optimization, Proceedings of Conference EUROCK 2018: Geomechanics And Geodynamics Of Rock Masses, 2018, V. 2, pp. 1425–1430.

4. Kovari K. et al., ISRM-suggested methods for determining the strength of rock materials in triaxial compression: Revised version, Int. J. Rock. Mech. Min. Sci. & Geomech., 1983, V. 20, pp. 283–290.

5. ASTM D7012 – 14e1. Standard test methods for compressive strength and elastic moduli of intact rock core specimens under varying states of stress and temperatures, 2014.

6. Zoback M., Reservoir geomechanics, Cambridge: Cambridge University Press, 2007, 449 p.

7. Kashnikov Yu.A., Ashikhmin S.G., Shustov D.V. et al., In situ stress in the oil fields of Western Ural (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 5, pp. 64–67.

8. Salimov V.G., Nasybullin A.V., Salimov O.V., Prikladnye zadachi tekhnologii gidravlicheskogo razryva plastov (Applied problems of hydraulic fracturing technology), Kazan': FEN Publ., 2018, 380 p.

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.

References

1. Ganaeva M.R., Sukhodanova S.S., Khaliulin Ruslan R., Khaliulin Rustam R., Sakhalin offshore oilfield hydraulic fracturing optimization by building a 3D geomechanical model (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 6, pp. 108–111.

2. Hiroki Sone, Mechanical properties of shale gas reservoir rocks and its relation to the in-situ stress variation observed in shale gas reservoirs, PhD thesis, 2012.

3. Shustov D.V., Kashnikov Yu.A., Ashikhmin S.G., Kukhtinskiy A.E., 3D geological geomechanical reservoir modeling for the purposes of oil and gas field development optimization, Proceedings of Conference EUROCK 2018: Geomechanics And Geodynamics Of Rock Masses, 2018, V. 2, pp. 1425–1430.

4. Kovari K. et al., ISRM-suggested methods for determining the strength of rock materials in triaxial compression: Revised version, Int. J. Rock. Mech. Min. Sci. & Geomech., 1983, V. 20, pp. 283–290.

5. ASTM D7012 – 14e1. Standard test methods for compressive strength and elastic moduli of intact rock core specimens under varying states of stress and temperatures, 2014.

6. Zoback M., Reservoir geomechanics, Cambridge: Cambridge University Press, 2007, 449 p.

7. Kashnikov Yu.A., Ashikhmin S.G., Shustov D.V. et al., In situ stress in the oil fields of Western Ural (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 5, pp. 64–67.

8. Salimov V.G., Nasybullin A.V., Salimov O.V., Prikladnye zadachi tekhnologii gidravlicheskogo razryva plastov (Applied problems of hydraulic fracturing technology), Kazan': FEN Publ., 2018, 380 p.



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