Optimization of the high-speed injection for horizontal well hydraulic fracturing in terms of Vingayahinskii section of Bazhen formation

UDK: 622.276.66
DOI: 10.24887/0028-2448-2017-4-90-95
Key words: unconventional reservoir, elasto-plastic model, stress state, strain, hydraulic fractures, Bazhenov formation
Authors: D.D. Bek, A.I. Akhtyamova, A.V. Myasnikov, V.P. Stanin (Skolkovo Institute of Science and Technology, RF, Moscow), Yu.P. Stefanov (A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS, RF, Novosibirsk), D.V. Alchibaev (Gazpromneft NTC LLC, RF, Saint-Petersburg)

The results of optimization of high-speed pumping during hydraulic fracturing (HF) fr om horizontal wells in formations of the Bazhenov formation are presented. The authors regarded the influence of two of seven major factors characterizing features of stress-strain and filtration properties of these formations strength characteristics of rocks including influences of a micro-jointing and mineralogical structure; and stratigraphically determined alternation of zones of brittle and ductile failure is considered. Also, the dependence of the solution on the mode of injection and on the initial stress distribution was considered. The elasto-plastic model specified for geomaterials was used. It is initialized by the technique developed on the base of the core tests carried out for one of the wells of the Vyngayakhinskoye field.

Optimization of the modes of injecting was performed on the basis of the concept of the pseudo-stationary condition of pumping realized at the termination of injecting into the well on the fixed volume of a fluid of the hydraulic fracturing and differing from stationary in ignorance of long relaxation dynamic effects of settling of the coordinated stress-strain state in layer and the well. Choosing of criterion function for optimization is not obvious in the conditions of manifestation of plastically caused effects of failure and is discussed in the details.

Optimization was preceded by the creation of a tornado charts for determination of the influence of uncertainty of elastic and strength parameters for the main rocks presented in all formations of a cross section

References

1. Drucker D.C., Prager W., Soil mechanics and plastic analysis for lim it design, Quarterly of Applied Mathematics, 1952, no. 2, pp. 157165.

2. Nikolaevskiy V.N., Opredelyayushchie uravneniya plasticheskogo deformirovaniya sypuchey sredy (In Russ.), Prikladnaya matematika i mekhanika, 1971, V. 35, no. 6, pp. 10171029.

3. Myasnikov A.V., Stefanov Yu.P., Stenin V.P. et al., A possible solution of multistage hydraulic fracturing design tasks Bazhenov formations (In Russ.), Nedropol'zovanie XXI vek, 2016. No. 6, pp. 62-68.

4. Stefanov Yu.P., Chertov M.A., Aidagulov G.R., Myasnikov A.V., Dynamics of inelastic deformation of porous rocks and formation of localized compaction zones studied by numerical modeling, Journal of the Mechanics and Physics of Solids, 2011, V. 59, pp. 23232340.

5. Stefanov Y.P., Bek D.D., Akhtyamova A.I., Myasnikov A.V., Modelling of hydraulic fractures propagation in the layered elastoplastic media, SPE 182021-MS, 2016.

6. Wilkins M.L., Computer simulation of dynamic phenomena, Berlin Heidelberg  New York: Springer-Verlag, 1999.

7. Boronin S.A., Osiptsov A.A., Desroches J., Displacement of yield-stress fluids in a fracture, International Journal of Multiphase Flow, 2015, V. 76, pp. 4763.

8. Patent no. 9120963 US B2, Delayed water-swelling materials and methods of use, Inventors: Willberg D.M., Nosova K., Bulova M., S James., Sokolov S. 

9. Kohar J.P., Gofoi S., Radial drilling technique for improving recovery from existing   oil fields, International Journal of Scientific & Technology Research, 2014, V. 3, pp. 159161.

The results of optimization of high-speed pumping during hydraulic fracturing (HF) fr om horizontal wells in formations of the Bazhenov formation are presented. The authors regarded the influence of two of seven major factors characterizing features of stress-strain and filtration properties of these formations strength characteristics of rocks including influences of a micro-jointing and mineralogical structure; and stratigraphically determined alternation of zones of brittle and ductile failure is considered. Also, the dependence of the solution on the mode of injection and on the initial stress distribution was considered. The elasto-plastic model specified for geomaterials was used. It is initialized by the technique developed on the base of the core tests carried out for one of the wells of the Vyngayakhinskoye field.

Optimization of the modes of injecting was performed on the basis of the concept of the pseudo-stationary condition of pumping realized at the termination of injecting into the well on the fixed volume of a fluid of the hydraulic fracturing and differing from stationary in ignorance of long relaxation dynamic effects of settling of the coordinated stress-strain state in layer and the well. Choosing of criterion function for optimization is not obvious in the conditions of manifestation of plastically caused effects of failure and is discussed in the details.

Optimization was preceded by the creation of a tornado charts for determination of the influence of uncertainty of elastic and strength parameters for the main rocks presented in all formations of a cross section

References

1. Drucker D.C., Prager W., Soil mechanics and plastic analysis for lim it design, Quarterly of Applied Mathematics, 1952, no. 2, pp. 157165.

2. Nikolaevskiy V.N., Opredelyayushchie uravneniya plasticheskogo deformirovaniya sypuchey sredy (In Russ.), Prikladnaya matematika i mekhanika, 1971, V. 35, no. 6, pp. 10171029.

3. Myasnikov A.V., Stefanov Yu.P., Stenin V.P. et al., A possible solution of multistage hydraulic fracturing design tasks Bazhenov formations (In Russ.), Nedropol'zovanie XXI vek, 2016. No. 6, pp. 62-68.

4. Stefanov Yu.P., Chertov M.A., Aidagulov G.R., Myasnikov A.V., Dynamics of inelastic deformation of porous rocks and formation of localized compaction zones studied by numerical modeling, Journal of the Mechanics and Physics of Solids, 2011, V. 59, pp. 23232340.

5. Stefanov Y.P., Bek D.D., Akhtyamova A.I., Myasnikov A.V., Modelling of hydraulic fractures propagation in the layered elastoplastic media, SPE 182021-MS, 2016.

6. Wilkins M.L., Computer simulation of dynamic phenomena, Berlin Heidelberg  New York: Springer-Verlag, 1999.

7. Boronin S.A., Osiptsov A.A., Desroches J., Displacement of yield-stress fluids in a fracture, International Journal of Multiphase Flow, 2015, V. 76, pp. 4763.

8. Patent no. 9120963 US B2, Delayed water-swelling materials and methods of use, Inventors: Willberg D.M., Nosova K., Bulova M., S James., Sokolov S. 

9. Kohar J.P., Gofoi S., Radial drilling technique for improving recovery from existing   oil fields, International Journal of Scientific & Technology Research, 2014, V. 3, pp. 159161.



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