scholarly journals On the impact of heterogeneity-aware mesh partitioning and non-contributing computation removal on parallel reservoir simulations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andreas Thune ◽  
Xing Cai ◽  
Alf Birger Rustad
Keyword(s):  
Real World ◽  
Communication Overhead ◽  
Petroleum Reservoir ◽  
Performance Impact ◽  
Reservoir Simulations ◽  
Mesh Partitioning ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
Hardware Platforms ◽  
The Impact

AbstractParallel computations have become standard practice for simulating the complicated multi-phase flow in a petroleum reservoir. Increasingly sophisticated numerical techniques have been developed in this context. During the chase of algorithmic superiority, however, there is a risk of forgetting the ultimate goal, namely, to efficiently simulate real-world reservoirs on realistic parallel hardware platforms. In this paper, we quantitatively analyse the negative performance impact caused by non-contributing computations that are associated with the “ghost computational cells” per subdomain, which is an insufficiently studied subject in parallel reservoir simulation. We also show how these non-contributing computations can be avoided by reordering the computational cells of each subdomain, such that the ghost cells are grouped together. Moreover, we propose a new graph-edge weighting scheme that can improve the mesh partitioning quality, aiming at a balance between handling the heterogeneity of geological properties and restricting the communication overhead. To put the study in a realistic setting, we enhance the open-source Flow simulator from the OPM framework, and provide comparisons with industrial-standard simulators for real-world reservoir models.

Evaluation of the impact of multi-phase flow on reservoir signatures in the Wolfcamp shale

2020 ◽  
Vol 76 ◽  
pp. 103187
Author(s):  
C.R. Clarkson ◽  
B. Yuan ◽  
Z. Zhang ◽  
F. Tabasinejad ◽  
H. Behmanesh ◽  
...  
Keyword(s):  
Phase Flow ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact

Annular Phase Separation with AICD Completions – The Impact on Well Flow Performance and Control of Unwanted Effluents

2021 ◽  
Author(s):  
Michael R Konopczynski ◽  
Mojtaba Moradi
Keyword(s):  
Computer Modelling ◽  
Thought Experiment ◽  
Model Parameters ◽  
Phase Flow ◽  
Well Productivity ◽  
Free Gas ◽  
Well Completion ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact

Abstract The design and method of operation of Autonomous Inflow Control Devices are reviewed, including single-phase and multi-phase flow performance. Next, the multi-phase flow of fluids in the annular space between circular conduits is examined based on published information and flow pattern maps. This information is brought together in a thought experiment describing how AICDs and well performance will react to the segregation of fluids upstream of the flow control device, and the potential impact that the degree of restrictiveness on unwanted effluents can affect the flow performance of the reservoir and well. Finally, the impact on well flow performance is quantified by computer modelling of the reservoir inflow performance, annular flow performance, and AICD performance. The sensitivity of well productivity is assessed for multiple flow scenarios adjusting several model parameters, including type and number of AICDs per zone, GOR, water cut, flow rate, and well completion size. Although the concept of an AICD that completely shuts off gas and/or water production sounds appealing to those wishing to eliminate the production of unwanted effluents, a full understanding of the dynamics of inflow from the reservoir and phase segregation in the wellbore is necessary to evaluate the impact of highly restrictive AICDs on well productivity. With annular separation, even small water cuts or limited amounts of free gas flowing into the wellbore can cause most of the highly restrictive AICDs in a multiple device zone to shut, greatly impacting the oil productivity of the zone and the well. Using AICDs that are not as restrictive of the unwanted effluents allows the operator to continue to produce oil at significant rates when associated with low water cuts or reduced free-gas GORs. A workflow for determining the optimum degree of restrictiveness is proposed and demonstrated.

Four-Phase Flow of Oil, Gas, Water, and Sand Mixtures in Subsea Pipelines

2020 ◽  
Author(s):  
Mohamed Odan ◽  
Faraj Ben Rajeb ◽  
Mohammad Azizur Rahman ◽  
Amer Aborig ◽  
Syed Imtiaz ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Fluid Velocity ◽  
Phase Flow ◽  
Flow Induced Vibration ◽  
Multi Phase Flow ◽  
Flow Variables ◽  
Multi Phase ◽  
Subsea Pipelines ◽  
The Impact ◽  
Oil Gas

Abstract This paper investigates issues around four-phase (Oil/CO2/water/sand) flows occurring within subsea pipelines. Multi-phase flows are the norm, as production fluid from reservoirs typically include sand with water. However, these multi-phase flow mixtures, whether three- or four-phase, are at risk of forming slug flows. The inclusion of sand in this mixture is concerning, as it not only leads to increased levels of pipeline erosion but it also has the potential, to accumulate sand at the bottom of the pipe, blocking the pipe or at the very least hindering the flow. This latter impact can prove problematic, as a minimum fluid velocity must be maintained to ensure the safe and regulated flow of particles along a pipeline. The presence of low amounts of sand particles in oil/gas/water flow mixtures can serve to reduce the pressure exerted on bends. The sand volume fraction must in this case, be relatively low such that the particles’ resistance causes only a moderate loss in pressure. Therefore, the study aims to gauge the impact of oil/gas/water/sand mixtures on various pipeline structures as well as to further investigate the phenomenon of flow-induced vibration to determine the optimal flow variables which can be applied predicting the structural responses of subsea pipelines.

State of Indoor Experiments on Supercritical CO2-Brine Displacement System

2013 ◽  
Vol 864-867 ◽  
pp. 1208-1212
Author(s):  
Zhen Zhang ◽  
Yuan Wang ◽  
Yang Liu
Keyword(s):  
Supercritical Co2 ◽  
Impact Factors ◽  
Saline Aquifers ◽  
Proper Understanding ◽  
Multi Phase Flow ◽  
Displacement System ◽  
Multi Phase ◽  
Future Work ◽  
The Impact ◽  
And Storage

As an emerging technique, carbon dioxide capture and storage (CCS) is to mitigate greenhouse gas emissions. Deep saline aquifers are increasingly considered because of their wide distributionlarge thicknesslarge capacity. A proper understanding of displacement character of supercritical CO2-brine system is significant in knowing CO2 Injectivity, migration and trapping, and in assessing the safety and suitability of reservoir site. CO2-brine system is multi-phase flow system, the mobility is related to interfacial tensioncapillary pressurerelative permeability. The experiments took into account the impact factors such as interfacial tensioncapillary pressurerelative permeability, foreign indoor experiments of CO2-brine system are analyzed and summarized, a brief description of indoor experiments of our country and future work are given.

Modelling of transient flow of piston ring-liner contact using synthetic lubricants

2021 ◽  
pp. 135065012110505
Author(s):  
Anastasios Zavos ◽  
Pantelis G Nikolakopoulos
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Piston Ring ◽  
Transient Flow ◽  
Lower Boundary ◽  
Phase Flow ◽  
Asperity Contact ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact

The paper contains the results of the transient flow of piston ring conjunction of a single-cylinder motorbike engine. Calculations of piston ring forces, asperity contact and gas blow-by are determined in computational fluid dynamics. The stochastic model of Greenwood-Tripp approach is used to predict the load of asperities. The hydrodynamic friction is also calculated by means of computational fluid dynamics including the multi-phase flow through Rayleigh–Plesset equation and a discrete phase model for simulating nanoparticles interaction. The major contribution of this analysis is to specifically investigate the impact of the lubricant with additives and the corresponding transient effects such as hydrodynamic pressure, cavitation and lubricant film within the contact. The results indicate that to investigate realistic mechanisms of multi-phase flow in piston ring-liner contact, the contribution of nanoparticles should be matched with the type of lubricants. In addition, this advanced computational fluid dynamics model showed that nanoparticles motion is important in reciprocating line contacts, leading to lower boundary friction in the order of 8.8% than a simple model where cavitation and nanoparticles are ignored.

Numerical Modeling and Analysis of Drainage Patterns of Saltcake in a Column

2006 ◽  
Author(s):  
Chunmiao Ye ◽  
Georgio Tachiev ◽  
Chengxian Lin
Keyword(s):  
Porous Media ◽  
Flow Model ◽  
External Pressure ◽  
Modeling And Analysis ◽  
Drainage Patterns ◽  
Multi Phase Flow ◽  
External Forces ◽  
Multi Phase ◽  
The Impact ◽  
Good Agreement

Saltcake, previously dissolved salts, such as sodium nitrate and sodium nitrite that crystallize out of solution, is a kind of porous media and an important component in many nuclear waste tanks. In this paper both one-dimensional single-phase and multi-phase flow model was employed to simulate unsaturated drainage of saltcake in a column caused by gravity or external forces under given initial and boundary conditions. Porous media properties used in the modeling was determined from our previous experimental data by inverse modeling method. Good agreement was found between the drainage result from available experiments and that from the numerical simulation using multiphase flow model. The impact on drainage by external pressure applying at the top of column and the influence of the height of column were also be investigated and presented in this study.

Four-Phase Flow of Oil, Gas, Water, and Sand Mixtures in Pipelines

2020 ◽  
Author(s):  
Mohamed Odan ◽  
Faraj Ben Rajeb ◽  
Mohammad Azizur Rahman ◽  
Amer Aborig ◽  
Syed Imtiaz ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Fluid Velocity ◽  
Phase Flow ◽  
Flow Induced Vibration ◽  
Structural Responses ◽  
Multi Phase Flow ◽  
Flow Variables ◽  
Multi Phase ◽  
The Impact ◽  
Oil Gas

Abstract This paper investigates issues around four-phase (Oil/CO2/water/sand) flows occurring within pipelines. Multiphase flows are the norm, as production fluid from reservoirs typically include sand with water. However, these multi-phase flow mixtures, whether three- or four-phase, are at risk of forming slug flows. The inclusion of sand in this mixture is concerning, as it not only leads to increased levels of pipeline erosion but it also has the potential, to accumulate sand at the bottom of the pipe, blocking the pipe or at the very least hindering the flow. This latter impact can prove problematic, as a minimum fluid velocity must be maintained to ensure the safe and regulated flow of particles along a pipeline. The presence of low amounts of sand particles in oil/gas/water flow mixtures can serve to reduce the pressure exerted on bends. The sand volume fraction must in this case, be relatively low such that the particles’ resistance causes only a moderate loss in pressure. Therefore, the study aims to gauge the impact of oil/gas/water/sand mixtures on various pipeline structures as well as to further investigate the phenomenon of flow-induced vibration to determine the optimal flow variables which can be applied predicting the structural responses of pipelines.

Best Practice Methodology to Enhance Modeling Inflow Control Technologies in Dynamic Reservoir Simulators

2021 ◽  
Author(s):  
Finlay Bertram ◽  
Terje Moen ◽  
Trygve Rinde ◽  
Morten Hansen Jondahl ◽  
Reidar Barfod Schüller
Keyword(s):  
Fluid Flow ◽  
Best Practice ◽  
Accurate Analysis ◽  
Generic Models ◽  
Reservoir Simulations ◽  
Mass Flowrate ◽  
Multi Phase Flow ◽  
Control Technologies ◽  
Multi Phase ◽  
Multiphase Behavior

Abstract The methodology presented here will expand on current modeling of Autonomous Inflow Control Devices (AICD) to generalize for a wider range of fluid flow rates and phases. It will also address the challenges of modeling multiphase behavior of the reservoir fluid flow. This paper presents proposed methods for selected devices, and device models supported by simulations. The proposed methods show the potential for qualified benchmarking of Inflow Control Technology (ICT) completed wells in dynamic reservoir simulations compared to the generic models currently in use. New single-phase models for segregated and sequential flow are presented, and these have a potential for greatly simplifying mass flowrate predictions for multi-phase flow leading to more accurate analysis within dynamic reservoir simulators.

Multi-phase Rate Transient Behaviors of the Multi-fractured Horizontal Well with Complex Fracture Networks

2021 ◽  
pp. 1-15
Author(s):  
Youwei He ◽  
Yingjie Xu ◽  
Yong Tang ◽  
Yu Qiao ◽  
Wei Yu ◽  
...  
Keyword(s):  
Transient Response ◽  
Single Phase ◽  
Production Performance ◽  
Phase Flow ◽  
Fracture Networks ◽  
Model Combination ◽  
Complex Fracture ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact

Abstract Complex fracture networks (CFN) provide flow channels and significantly affect well performance in unconventional reservoirs. However, traditional rate transient analysis (RTA) models barely consider the effect of CFN on production performance. The impact of multi-phase flow on rate transient behaviors is still unclear especially under CFN. Neglecting these effects could cause incorrect rate transient response and erroneous estimation of well and fracture parameters. This paper investigates multi-phase rate transient behaviors considering CFN, and tries to investigate in what situations the multi-phase models should be used to obtain more accurate results. Firstly, an embedded discrete fracture model (EDFM) is generated instead of LGR method to overcome time-intensive computation. The model is coupled with reservoir models using non-neighboring connections (NNCs). Secondly, eight cases are designed using the EDFM technology to analyze effect of natural fractures, formation permeability, and relative permeability on rate transient behaviors. Thirdly, Blasingame plot, log-log plot, and linear flow plot are used to analyze the differences of rate transient response between single-phase and multi-phase flow in reservoirs with CFN. For multi-phase flow, severe deviations can be observed on RTA plots compared with single-phase model. Combination of three RTA type curves can characterize the differences from early to late flow regimes and improve the interpretation accuracy as well as reduce the non-unicity. Finally, field data analysis in Permian Basin demonstrates that multi-phase RTA analysis are required for analyzing production and pressure data since single-phase RTA analysis will lead to big errors especially under high water cut during fracturing fluid flowback period, early production of unconventional gas wells or after waterflooding or water huff-n-puff.

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