Determination of closure pressure for hydraulic fractures using instruments of geomechanical modeling

Authors: A.I. Fedorov, A.R. Davletova (RN-UfaNIPIneft LLC, RF, Ufa), D.Yu. Pisarev (RN-Yuganskneftegas LLC, RF, Nefteyugansk)

Key words: low permeability reservoirs, hydraulic fracturing, fracture initiated by injection, strain-stress state, fracture closure pressure.

The paper presents a method for calculation of closure pressure on hydraulic fractures on injection wells as a parameter determining the beginning of fracture growth. The method is based on formation stress-strain state modeling in an area close to the fractured wellbore. The model for calculation takes into account the evolution of pressure field caused by exploitation. The results of modelling show good agreement with field data and can be used as a method alternative to field measurements methods, that now-a-days are the basic instrument of closure pressure determination.
References
1. Fedorov A.I., Davletova A.R., Reservoir stress state simulator for determining of fracture growth direction (In Russ.), Geofizicheskie issledovaniya, 2014, V. 15, no. 1, pp. 15–26.
2. Blokhin A.M., Dorovskiy V.N., Problemy matematicheskogo modelirovaniya v teorii mnogoskorostnogo kontinuuma (Problems of mathematical modeling in the multirate-continuum theory), Novosibirsk: Publ. of SBRAS, 1994, 185 p.
3. Crouch S.L, Starfield A.M., Boundary element methods in solid mechanics,
London: George Allen and Unwin, 1983.

Key words: low permeability reservoirs, hydraulic fracturing, fracture initiated by injection, strain-stress state, fracture closure pressure.

The paper presents a method for calculation of closure pressure on hydraulic fractures on injection wells as a parameter determining the beginning of fracture growth. The method is based on formation stress-strain state modeling in an area close to the fractured wellbore. The model for calculation takes into account the evolution of pressure field caused by exploitation. The results of modelling show good agreement with field data and can be used as a method alternative to field measurements methods, that now-a-days are the basic instrument of closure pressure determination.
References
1. Fedorov A.I., Davletova A.R., Reservoir stress state simulator for determining of fracture growth direction (In Russ.), Geofizicheskie issledovaniya, 2014, V. 15, no. 1, pp. 15–26.
2. Blokhin A.M., Dorovskiy V.N., Problemy matematicheskogo modelirovaniya v teorii mnogoskorostnogo kontinuuma (Problems of mathematical modeling in the multirate-continuum theory), Novosibirsk: Publ. of SBRAS, 1994, 185 p.
3. Crouch S.L, Starfield A.M., Boundary element methods in solid mechanics,
London: George Allen and Unwin, 1983.


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