Numerical simulation and analysis of the influence of fracture geometry on wormhole propagation in carbonate reservoirs

2019 ◽  
Vol 198 ◽  
pp. 124-143 ◽  
Author(s):  
Ning Qi ◽  
Guobin Chen ◽  
Chong Liang ◽  
Tiankui Guo ◽  
Guoliang Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Carbonate Reservoirs ◽  
Fracture Geometry

NUMERICAL SIMULATION OF FLOWS IN CARBONATE RESERVOIRS USING A STOKES-BRINKMAN MODEL AND LOCALLY CONSERVATIVE METHODS

2019 ◽  
Author(s):  
Sidclei Conceição ◽  
Marcelo Seidel ◽  
Paulo Roberto Maciel Lyra ◽  
DARLAN KARLO ELISIÁRIO DE CARVALHO
Keyword(s):  
Numerical Simulation ◽  
Carbonate Reservoirs ◽  
Brinkman Model ◽  
Locally Conservative

Numerical simulation of complex fracture geometry caused by hydrodynamics in shale with pre-existing weak planes

2021 ◽  
Vol 199 ◽  
pp. 108306
Author(s):  
Yongquan Hu ◽  
Qiang Wang ◽  
Jinzhou Zhao ◽  
Shengnan Chen ◽  
Daiqiang Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fracture Geometry ◽  
Complex Fracture

Modeling Acid Fracturing Treatments with Multi-Stage Alternating Injection of Pad and Acid Fluids

2021 ◽  
Author(s):  
Rencheng Dong ◽  
Mary F. Wheeler ◽  
Hang Su ◽  
Kang Ma
Keyword(s):  
Viscous Fingering ◽  
High Viscosity ◽  
Carbonate Reservoirs ◽  
Acid Etching ◽  
Fracture Geometry ◽  
Fracture Conductivity ◽  
Acid Fracturing ◽  
Fracture Surfaces ◽  
Low Viscosity ◽  
Multi Stage

Abstract Acid fracturing technique is widely applied to stimulate the productivity of carbonate reservoirs. The acid-fracture conductivity is created by non-uniform acid etching on fracture surfaces. Heterogeneous mineral distribution of carbonate reservoirs can lead to non-uniform acid etching during acid fracturing treatments. In addition, the non-uniform acid etching can be enhanced by the viscous fingering mechanism. For low-perm carbonate reservoirs, by multi-stage alternating injection of a low-viscosity acid and a high-viscosity polymer pad fluid during acid fracturing, the acid tends to form viscous fingers and etch fracture surfaces non-uniformly. To accurately predict the acid-fracture conductivity, this paper developed a 3D acid fracturing model to compute the rough acid fracture geometry induced by multi-stage alternating injection of pad and acid fluids. Based on the developed numerical simulator, we investigated the effects of viscous fingering, perforation design and stage period on the acid etching process. Compared with single-stage acid injection, multi-stage alternating injection of pad and acid fluids leads to narrower and longer acid-etched channels.

Innovative Techniques for Optimization of Far-Field Diverter Materials to Enhance Fracture Geometry in Carbonate Reservoirs

2021 ◽  
Author(s):  
Maunish Shah ◽  
Nicholas A. Koster ◽  
Connor Clark ◽  
Subhash N. Shah
Keyword(s):  
Filter Press ◽  
Carbonate Reservoirs ◽  
Additional Stress ◽  
Far Field ◽  
Fracture Geometry ◽  
Hydrocarbon Production ◽  
Upward Growth ◽  
Degradation Behaviors ◽  
Experimental Findings ◽  
Effective Seal

Abstract The technique of employing specialized particulates for far-field diversion is well-established during hydraulic fracturing treatments in unconventional formations and is being investigated for use in conventional formations. Far-field diverters (FFD) divert fluid away from the wellbore far into the formation. The injection of FFD at the beginning of the treatment provides an additional stress barrier between the producing interval and adjacent layers by depositing at the layer boundaries where higher leak-off is encountered. The ensuing restriction in height growth maximizes fracture extension within the producing zone, optimizing geometry for increased hydrocarbon production while limiting excess water. Polylactic Acid (PLA) polymer is self-degradable, compatible with reservoir fluids, and has a variety of compositions for different temperature applications. Blending proppant with PLA has been seen to significantly improve the strength of the deposited far-field diverter. Therefore, PLA powder and silica proppant are blended to develop Generation-1 far-field diverter (FFD-Gen1). However, many silica proppants have greater density than PLA, leading to separation during transport which prevents these two components from depositing evenly at the upper fracture boundary. This results in a situation in which excessive downward growth is prevented while upward growth is left unchecked. For this reason, both components need to be simultaneously deposited in order to develop an effective seal. Generation-2 far-field diverter (FFD-Gen2) is developed by replacing silica proppant of FFD-Gen1 with a deformable proppant having a density nearly equal to the polymer, which enables uniform deposition on all adjacent formation boundaries where leakoff is encountered. The deformable characteristic improves the pressure withstanding capacity of the diverter pack. The deposition and degradation behaviors are investigated in the laboratory by performing HTHP filter press and plug stability experiments. Experimental findings suggest that the primary selection criteria for acceptable performance are the material's mechanical properties. This methodology is used to select the appropriate FFD materials to optimize fracture geometry in carbonate reservoirs. Successful applications prevent excessive water production and substantially increase hydrocarbon production as illustrated in a three well case studies.

scholarly journals Numerical Simulation of a Single-Phase Flow Through Fractures with Permeable, Porous and Non-Ductile Walls

2017 ◽  
Vol 7 (5) ◽  
pp. 2041-2046
Author(s):  
N. Pour Mahmoud ◽  
A. Zabihi
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Single Phase ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Surrounding Area ◽  
Fracture Geometry ◽  
Pressure Drops ◽  
Permeable Walls ◽  
Flow Through

This paper attempts to study flows within fractures through a set of numerical simulations. In addition, a special care is given to hydraulic features and characteristics of fractures. The research is performed through the application of calculative fluid dynamics and a finite volume discrete schema. The investigated flows are laminar, single-phase and stable flows of water and air through fractures with penetrable walls. The selected fracture geometry is inspired from the tomographic scan of a stone fracture. Water and air are modeled in fractures with permeable walls and different permeability levels. It has been observed that in case of permeable matrixes, the friction coefficient is lower compared to impermeable matrixes. In fact permeability reduced friction. In addition, highest pressure drops were observed in areas with smaller fracture diaphragms. Nonetheless, the surrounding area of the fracture is analyzed with the consideration of Darcy's rule.

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