A dual-grid, implicit, and sequentially coupled geomechanics-and-composition model for fractured reservoir simulation

Li，Xin1; Li，Xiang2; Zhang，Dongxiao3; Yu，Rongze4

2020

10.2118/201210-PA

SPE JOURNAL   影响因子和分区

1086-055X

In the development of fractured reservoirs, geomechanics is crucial because of the stress sensitivity of fractures. However, the complexities of both fracture geometry and fracture mechanics make it challenging to consider geomechanical effects thoroughly and efficiently in reservoir simulations. In this work, we present a coupled geomechanics and multiphase-multicomponent flow model for fractured reservoir simulations. It models the solid deformation using a poroelastic equation, and the solid deformation effects are incorporated into the flow model rigorously. The noticeable features of the proposed model are it uses a pseudocontinuum equivalence method to model the mechanical characteristics of fractures; the coupled geomechanics and flow equations are split and sequentially solved using the fixed-stress splitting strategy, which retains implicitness and exhibits good stability; and it simulates geomechanics and compositional flow, respectively, using a dual-grid system (i.e., the geomechanics grid and the reservoir-flow grid). Because of the separation of the geomechanics part and the flow part, the model is not difficult to implement based on an existing reservoir simulator. We validated the accuracy and stability of this model through several benchmark cases and highlighted the practicability with two large-scale cases. The case studies demonstrate that this model is capable of considering the key effects of geomechanics in fractured-reservoir simulation, including matrix compaction, fracture normal deformation, and shear dilation, as well as hydrocarbon phase behavior. The flexibility, efficiency, and comprehensiveness of this model enable a more realistic geocoupled reservoir simulation.

SCI ; EI

英语

其他

National Natural Science Foundation of China[51520105005][U1663208] ; National Science and Technology Major Project of China[2016ZX05037-003][2017ZX05049-003]

Engineering

Engineering, Petroleum

WOS:000576604600035

SOC PETROLEUM ENG

20203709157057

Shear flow ; Deformation ; Petroleum reservoirs ; Stresses ; Fracture ; Fracture mechanics

Geology and Geophysics:481 ; Oil Fields:512.1.1 ; Fluid Flow, General:631.1 ; Mechanics:931.1 ; Materials Science:951

ENGINEERING

2-s2.0-85090361114

Scopus

1.Peking University,China
2.Qingdao Dadi Institute of New Energy Technologies,China
3.Southern University of Science and Technology,China
4.Research Institute of Petroleum Exploration and Development,China

Li，Xin,Li，Xiang,Zhang，Dongxiao,et al. A dual-grid, implicit, and sequentially coupled geomechanics-and-composition model for fractured reservoir simulation[J]. SPE JOURNAL,2020,25(4):2098-2118.

Li，Xin,Li，Xiang,Zhang，Dongxiao,&Yu，Rongze.(2020).A dual-grid, implicit, and sequentially coupled geomechanics-and-composition model for fractured reservoir simulation.SPE JOURNAL,25(4),2098-2118.

Li，Xin,et al."A dual-grid, implicit, and sequentially coupled geomechanics-and-composition model for fractured reservoir simulation".SPE JOURNAL 25.4(2020):2098-2118.