A Coupled Model to Simulate the Fluid Flow in the Reservoir and Horizontal Wellbore

2006 ◽  
Author(s):  
P. Gui ◽  
J.C. Cunha ◽  
L.B. Cunha
Keyword(s):  
Fluid Flow ◽  
Coupled Model ◽  
Horizontal Wellbore

Simultaneous Multifracture Treatments: Fully Coupled Fluid Flow and Fracture Mechanics for Horizontal Wells

SPE Journal ◽  
2014 ◽  
Vol 20 (02) ◽  
pp. 337-346 ◽  
Author(s):  
Kan Wu ◽  
Jon E. Olson
Keyword(s):  
Fluid Flow ◽  
Fracture Propagation ◽  
Horizontal Wells ◽  
Gas Production ◽  
Propagation Model ◽  
Displacement Discontinuity ◽  
Hydraulic Fractures ◽  
Multiple Fractures ◽  
Frictional Pressure Drop ◽  
Horizontal Wellbore

Summary Successfully creating multiple hydraulic fractures in horizontal wells is critical for unconventional gas production economically. Optimizing the stimulation of these wells will require models that can account for the simultaneous propagation of multiple, potentially nonplanar, fractures. In this paper, a novel fracture-propagation model (FPM) is described that can simulate multiple-hydraulic-fracture propagation from a horizontal wellbore. The model couples fracture deformation with fluid flow in the fractures and the horizontal wellbore. The displacement discontinuity method (DDM) is used to represent the mechanics of the fractures and their opening, including interaction effects between closely spaced fractures. Fluid flow in the fractures is determined by the lubrication theory. Frictional pressure drop in the wellbore and perforation zones is taken into account by applying Kirchoff's first and second laws. The fluid-flow rates and pressure compatibility are maintained between the wellbore and the multiple fractures with Newton's numerical method. The model generates physically realistic multiple-fracture geometries and nonplanar-fracture trajectories that are consistent with physical-laboratory results and inferences drawn from microseismic diagnostic interpretations. One can use the simulation results of the FPM for sensitivity analysis of in-situ and fracture treatment parameters for shale-gas stimulation design. They provide a physics-based complex fracture network that one can import into reservoir-simulation models for production analysis. Furthermore, the results from the model can highlight conditions under which restricted width occurs that could lead to proppant screenout.

A Novel Two-Way Coupled Model for Simulating the Interaction between Fluid flow and Floating Debris

2020 ◽  
Author(s):  
Yan Xiong ◽  
Qiuhua Liang ◽  
Gang Wang ◽  
Yunsong Cui
Keyword(s):  
Fluid Flow ◽  
Water Depth ◽  
Hydrodynamic Model ◽  
High Performance ◽  
Large Scale ◽  
Coupled Model ◽  
Storm Surges ◽  
Floating Objects ◽  
The Impact ◽  
Dem Model

<p>Extreme natural hazards such as tsunamis or storm surges have been frequently reported in recent years, posting serious threat to people and their properties. Numerical modelling has provided an indispensable tool to predict these hazardous events and assess their risks. However, most of the current models are based on the assumption of “clean” water and neglect the impact of floating debris as observed in reality. The interactive processes between the floating debris and the background fluid flow have not been well explored and understood. Few reliable modelling tool has been reported for simulating and predicting these complicated processes.</p><p>This work presents a two-way dynamic method to couple a 2D shallow flow hydrodynamic model with a discrete element method (DEM) model for simulating and analyzing the interactive process between fluid flow and floating debris under the extreme hydraulic conditions induced by tsunami or flash flooding. The proposed two-way coupling approach uses the high-resolution water depth and velocity predicted by the hydrodynamic model to quantify the hydrostatic and dynamic forces acting on the floating objects; the corresponding counter forces on the fluid are subsequently taken into account by including extra source terms in the governing shallow water equations (SWEs) of hydrodynamic model. This new approach lifts the limitation of traditional approaches that reply on calibrated empirical parameters to quantify the forces. In developing the resulting coupled model, a multi-sphere method (MSM) is adopted and implemented in the DEM model to simulate solid debris. This method ensures that the interaction of fluid and solid is realistically modelled and the application is not restricted by shapes and sizes of debris.</p><p>The new coupling model is validated against a dam-break flume experiment with three floating objects impacting two fixed obstacles. The predicted results in terms of water depth and floating object displacements in both horizontal and vertical directions compare well with the experimental observations. Furthermore, the new coupled model is computationally accelerated by implementation on modern GPUs to achieve high-performance computing. It provides a robust and innovative modelling tool for the simulation of large-scale flooding process including debris impact and assess the resulting risk.</p><p></p><p></p><p></p>

Melt Pool Flow and Surface Evolution During Pulsed Laser Micro Polishing of Ti6Al4V

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Chao Ma ◽  
Madhu Vadali ◽  
Neil A. Duffie ◽  
Frank E. Pfefferkorn ◽  
Xiaochun Li
Keyword(s):  
Fluid Flow ◽  
Pulse Duration ◽  
Cross Sections ◽  
Pulsed Laser ◽  
Surface Profile ◽  
Coupled Model ◽  
Transient Model ◽  
Surface Evolution ◽  
Melt Pool ◽  
Metallic Parts

Extensive experimental work has shown that pulsed laser micro polishing (PLμP) is effective for polishing micro metallic parts. However, the process physics have not been fully understood yet, especially with respect to the melt pool flow. A reliable physical model can be of significant assistance in understanding the fluid flow in the melt pool and its effect on PLμP. In this paper, a two-dimensional axisymmetric transient model that couples heat transfer and fluid flow is described that was constructed using the finite element method. The model not only provided the solutions to the temperature and velocity fields but also predicted the surface profile evolution on a free deformable surface. The simulated melt depth and resolidified surface profiles matched those obtained from optical images of PLμPed Ti6Al4V sample cross-sections. The model was also used to study the effect of laser pulse duration on the melt pool flow. The study suggests that longer pulses produce more significant fluid flows. The cut-off pulse duration between capillary and thermocapillary regimes, below which minimal Maragoni flow should be expected, was estimated to be 0.66 μs for Ti6Al4V, which also matched well with the experimental results. It is evident that the coupled model offers reliable predictions and thus can be extended for a more complex parametric study to provide further insights for PLμP.

Sectional Optimization Study on Perforation Parameters of Horizontal Wells in DaQing Oilfield

2012 ◽  
Vol 594-597 ◽  
pp. 2586-2589 ◽  
Author(s):  
Hai Jun Zhang ◽  
Zhi Zhong Yang ◽  
Peng Ju Guan ◽  
Guo Ping Xu ◽  
Li Fu ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Pressure Distribution ◽  
Flow Rate ◽  
Optimization Technique ◽  
Coupled Model ◽  
Horizontal Wells ◽  
Flow Models ◽  
Optimization Study ◽  
Horizontal Wellbore ◽  
Inflow Profile

A coupled model for horizontal wells with perforation completion was built by combing the flow models in reservoir and wellbore. Then used the genetic algorithm to determine the flow rate and pressure distribution along the wellbore. The influence of the length and position of the perforation section to the production ability was also studied. The partition perforation optimization technique can uniform the inflow profile along the horizontal wellbore, prolong the develop cycle, and increase the development benefit.

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