000			02960nab a2200241 4500
005			20260520004412.0
008			260224s2012 xxu ing
041			_aInglés
245	0	0	_aProduction-Induced Stress Change in and Above a Reservoir Pierced by Two Salt Domes _bA Geomechanical Model and Its Applications
260			_a _b _cmar. 2012
270			_a03/12/2012 ; 03/12/2012
300			_a17 p. ; 80-97
520			_aTranscripción del resumen del autor Production decreases the pore-fluid pressure and increases the effective stress acting on the load-bearing-grain framework that makes up the reservoir. As a result, the reservoir deforms and compacts, and because it is connected to the rocks around it, there will be deformations and displacements in these rocks also. Well known geomechanical effects of production include surface subsidence, wells damaged by shear, and time shifts in 4D seismic. Less well known is how the changes in the stress field itself should be taken into account in operations - e.g., to design infill wells and to plan production stimulation by hydraulic fracturing or waterflooding of the reservoir. We present a geomechanical model for the initial stress field and production-induced stress changes in and around a steeply dipping hydrocarbon reservoir penetrated by two large salt domes. The model integrates 3D seismic and geological understanding, geomechanical data from wells and analogues, and depletion patterns from fluid-flow (dynamic) simulation. Our model results confirm published models of principal-stress orientation in rocks pierced by salt domes. The depleted-model results show stress changes up to several MPa in magnitude compared with the preproduction stress state, but only limited changes in the stress orientations. The model highlights the influence of structural dip and time-dependent salt/sediment interaction on stress changes. We then describe the application of the model in wellbore stress analysis for infill wells and in a water-injection scheme that has, we believe, been severely impacted by injection-induced fractures propagating in the reservoir from the injector wells toward the producer wells. We explain how the latter application uses a 3D flow-simulation model coupled to a dynamic fracture-propagation model. The geomechanical model provides key input: stress magnitude and stress orientation. Results are validated against a more conventional analysis of real-time pressure data. In both applications, the integration of geomechanics in 3D static and dynamic models improved insight into the rock response to drilling and waterflooding, thus helping to optimize production.
581			_a1
773	0		_tSPE Journal _g17
942			_cARTICULO
100	1		_aSchutjens, P.M.T.M. _952815
100	1		_aSnippe, J.R. _952816
100	1		_aMahani, H. _952817
100	1		_aTurner, J. _948062
100	1		_aIta, J. _952818
999			_c187475 _d187475