Compositional Modeling of Liquid-Rich Shales Considering Adsorption, Non-Darcy Flow Effects and Pore Proximity Effects on Phase Behavior

2013 ◽  
Author(s):  
X. Xiong ◽  
D. Devegowda ◽  
F. Civan ◽  
R.F. Sigal ◽  
A. Jamili
Keyword(s):  
Phase Behavior ◽  
Proximity Effects ◽  
Darcy Flow ◽  
Compositional Modeling ◽  
Flow Effects

Nanopore Compositional Modeling in Unconventional Shale Reservoirs

2016 ◽  
Vol 19 (03) ◽  
pp. 415-428 ◽  
Author(s):  
Najeeb S. Alharthy ◽  
Tadesse W. Teklu ◽  
Thanh N. Nguyen ◽  
Hossein Kazemi ◽  
Ramona M. Graves
Keyword(s):  
Phase Behavior ◽  
Oil Recovery ◽  
Flow Behavior ◽  
Flow Characteristics ◽  
Gas Production ◽  
Eagle Ford ◽  
Compositional Modeling ◽  
Shale Reservoirs ◽  
Behavior Shift

Summary Understanding the mechanism of multicomponent mass transport in the nanopores of unconventional reservoirs, such as Eagle Ford, Niobrara, Woodford, and Bakken, is of great interest because it influences long-term economic development of such reservoirs. Thus, we began to examine the phase behavior and flow characteristics of multicomponent flow in primary production in nanoporous reservoirs. Besides primary recovery, our long-term objectives included enhanced oil production from such reservoirs. The first step was to evaluate the phase behavior in nanopores on the basis of pore-size distribution. This was motivated because the physical properties of hydrocarbon components are affected by wall proximity in nanopores as a result of van der Waals molecular interactions with the pore walls. For instance, critical pressure and temperature of hydrocarbon components shift to lower values as the nanopore walls become closer. In our research, we applied this kind of critical property shift to the hydrocarbon components of two Eagle Ford fluid samples. Then, we used the shifted phase characteristics in dual-porosity compositional modeling to determine the pore-to-pore flow characteristics, and, eventually, the flow behavior of hydrocarbons to the wells. In the simulation, we assigned three levels of phase behavior in the matrix and fracture pore spaces. In addition, the flow hierarchy included flow from matrix (nano-, meso-, and macropores) to macrofractures, from macrofractures to a hydraulic fracture (HF), and through the HF to the production well. From the simulation study, we determined why hydrocarbon fluids flow so effectively in ultralow-permeability shale reservoirs. The simulation also gave credence to the intuitive notion that favorable phase behavior (phase split) in the nanopores is one of the major reasons for production of commercial quantities of light oil and gas from shale reservoirs. It was determined that the implementation of confined-pore and midconfined-pore phase behavior lowers the bubblepoint pressure, and this, in turn, leads to a slightly higher oil recovery and lesser gas recovery. Also it was determined that the implementation of midconfined-pore and confined-pore phase-behavior shift reduces the retrograde liquid-condensation region, which in turn, leads to lower liquid yield while maintaining the same gas-production quantity. Finally, the important reason that we are able to produce shale reservoirs economically is “rubblizing” the reservoir matrix near HFs, which creates favorable permeability pathways to improve reservoir drainage. This is why multistage hydraulic fracturing is so critical for successful development of shale reservoirs.

A Fully-Coupled Free and Adsorptive Phase Transport Model for Shale Gas Reservoirs Including Non-Darcy Flow Effects

2012 ◽  
Author(s):  
Xinya Xiong ◽  
Deepak Devegowda ◽  
Guillermo German Michel Villazon ◽  
Richard F. Sigal ◽  
Faruk Civan
Keyword(s):  
Shale Gas ◽  
Transport Model ◽  
Darcy Flow ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs ◽  
Flow Effects ◽  
Phase Transport ◽  
Fully Coupled

Gas Well Decline Analysis Under Constant-Pressure Conditions, Wellbore Storage, Damage, and Non-Darcy Flow Effects

2002 ◽  
Author(s):  
Ibrahim Sami Nashawi ◽  
Fuad H. Qasem ◽  
Ridha Gharbi ◽  
Mohammad I. Mir
Keyword(s):  
Constant Pressure ◽  
Darcy Flow ◽  
Gas Well ◽  
Wellbore Storage ◽  
Flow Effects

An Investigation of Non-Darcy Flow Effects on Hydraulic Fractured Oil and Gas Well Performance

2004 ◽  
Author(s):  
M.B. Smith ◽  
A. Bale ◽  
L.K. Britt ◽  
L.E. Cunningham ◽  
J.R. Jones ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Darcy Flow ◽  
Well Performance ◽  
Gas Well ◽  
Flow Effects

Non-Darcy Flow Effects in Dual-Porosity, Dual-Permeability Naturally Fractured Gas Condensate Reservoirs

2007 ◽  
Author(s):  
Benjamin Alejandro Ramirez ◽  
Hossein Kazemi ◽  
Erdal Ozkan ◽  
Mohammad Farooq Al-Matrook
Keyword(s):  
Gas Condensate ◽  
Darcy Flow ◽  
Dual Porosity ◽  
Gas Condensate Reservoirs ◽  
Naturally Fractured ◽  
Flow Effects
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