Comparison of Skin Factors for Perforated Completions Calculated with Computational Fluid Dynamics Software and a Semi-Analytical Model

Sun, Danmei; Li, Baoyan; Gladkikh, Mikhail; Satti, Rajani; Evans, Randy L.

doi:10.2118/143663-ms

Cited by 12 publications

(5 citation statements)

References 10 publications

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“…CFD has been applied successfully in many industries and recently in the oil and gas industry. Considerable technical papers presented the application of CFD for inflow well performance, formation damage, completion design, fracturing, matrix acidizing and development of inflow control device (ICDs) [3][4][5][6][7][8][9]. This paper is using Comsol package for numerical modeling.…”

Section: Application Of Computational Fluid Dynamic (Cfd)mentioning

confidence: 99%

Insights into the Process of Effectively Acidizing Naturally Fractured Reservoirs

Salimi¹,

Ghalambor

Hayer³

2014

Day 2 Thu, February 27, 2014

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This paper presents the simulation results of acidizing process in naturally fractured reservoir (NFR) by application of advanced numerical technique. Accurately predicting fracture and matrix flow is often critical to assessing well productivity in naturally fractured reservoirs.Fracturing with acid (usually hydrochloric acid [HCl]) is an alternative to propped fractures in acid-soluble formations such as dolomites and limestones. Computational Fluid Dynamics (CFD) is a computational technology that enables study of the dynamics of materials that flow. The CFD code is used to simulate the fluid flow through the fracture and matrix. The model is based on coupled multiphysics phenomena such as Darcy's law in porous media, reaction flow equation for the fracture and fracture growth by acid dissolution. Reaction flow in the fracture is controlled by diffusion and convection terms. The model simulates the impact of fracture geometry, acid properties, fracture width, matrix permeability on the acidizing process.The results show that diffusion and convection terms will control the transport of acid through the fracture (as there are limits to this process). when the mass transfer coefficient (K g ) is higher than 10e-5 m 2 /sec, the mechansim of acid trasnport will be controlled by convection term on the fracture surface. Physically ,this means that acid transport to wall by diffussion term is negligilble. When the fracture width is higher than 200 micron (0.00002 m), the acid will react with the most of the surface of the fracture and it will be dissolved by acid considerably. The mass transfer coefficient will also play an important role during acidizing process as the results show. The results of this study were used as guidelines to design a more effective acid job by predicting the acid penetration and acid volume for matrix acidizing in naturally fractured reservoirs. Furthermore, the contrasts in job design for lithology of the carbonate formation are also presented.

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Section: Application Of Computational Fluid Dynamic (Cfd)mentioning

confidence: 99%

Insights into the Process of Effectively Acidizing Naturally Fractured Reservoirs

Salimi¹,

Ghalambor

Hayer³

2014

Day 2 Thu, February 27, 2014

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“…Byrne et al (2011) made several simulations to capture the effect of crossflow between layers and the formation damage effect on it. Sun, et al (2011) studied with this technique the skin factor on perforated completions considering the effects of formation damagee, perforation damage and anistotropy. Sansoni et al (2007) proposed a 3D-3D model to solve the wellreservoir coupling aiming to correct predict the horizontal well productivity.…”

Section: Introductionmentioning

confidence: 99%

CFD as a Tool For Pumping Strategy Evaluation on Matrix Acidizing Treatments

Melo

Oliveira

2013

All Days

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Computational Fluid Dynamics (CFD) is a widely used technique to solve transport phenomena problems by the discretization of the conservation equations on the geometry of interest. Recently, several SPE papers use CFD to solve near wellbore problems. Features like perforated completions and fluid flow performance on multiple layers reservoirs are topics addressed. Other works focus on the reactive dissolution of carbonates. However, they are restricted to small scales due to the phenomenon complexity and high computational cost. Most commercial CFD simulators allow users to implement their own models through user defined functions. This fact makes possible to simulate high complexity phenomena with lower computational cost. For instance, one could use an empirical model instead of solving the complete transport equations. CFD also allows a detailed view of flow aspects at wellbore scale, an important issue when flow paths or pressure drop are important to fluid placement. This work addresses the implementation of an empirical wormhole propagation model on a CFD software. We have two goals: the simulation of different pumping strategies for matrix acidizing treatments aiming acid placement optimization and show how CFD could be a powerful tool to solve near wellbore problems.

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“…These numerical simulations culminated in the semi-analytical productivity solution developed by Karakas and Tariq (1991). Although several notable efforts were made to improve the model with numerical and analytical solutions (Dugolu, 1998;Anseh et al 2002;Yildiz, 2006;Atkinson et al 2009;Sun et al 2011), no major issues have been identified. A few discrepancies between the model and numerical simulation results were primarily because of different, usually unrealistic, assumptions used in the numerical simulations rather than defects of the semi-analytical model.…”

Section: Introductionmentioning

confidence: 99%

Perforated Completion Optimization Using a New, Enhanced and Integrated Perforating Job Design Tool

et al. 2012

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Optimizing the performance of a perforated completion requires reliably estimating two groups of parameters: (a) perforation tunnel geometry, particularly depth of penetration (DoP); (b) the condition of perforation tunnels (fill and crushed zone damage). A recent industry survey showed that existing DoP algorithms, which were all based on conversion of surface concrete results to downhole stressed rock penetrations, have shortcomings. Most of the surveyed perforating design tools substantially overestimate stressed rock DoP. In addition, a vast and growing amount of laboratory and field data is revealing that the post-perforation tunnel damage primarily depends on dynamic rather than static underbalance condition. Yet the industry still lacks a reliable and practical algorithm to estimate post-perforation tunnel damage for dynamic underbalance (DUB) perforating. Furthermore, existing perforating design tools usually do not handle multi-zone completions or variations of formation properties along the wellbore. This paper describes a perforating job design process and software tool that seamlessly integrates a newly developed DoP model, a simple but robust algorithm to calculate post-perforation tunnel damage for dynamic underbalanced perforating, and a reliable model to reflect 3D fluid flow around the perforations. The new DoP model was constructed exclusively based on rigorous laboratory tests for each individual charge in different rocks under downhole conditions, rather than converted from surface concrete results. The transient pressure properties from a comprehensive wellbore dynamics simulator can be loaded into the planning tool for perforation tunnel damage estimation. The perforation skin algorithm due to DUB was developed through a combination of extensive flow tests, conducted in state-of-the-art facilities, and 3D numerical simulations. The integrated perforating design tool provides zonal productivity estimations for single or multi-zone settings. It also introduces an option to compute perforating parameters (penetration and perforation skin) along the borehole with variable formation properties obtained from well log data. The streamlined design workflow and integrated environment allows users to optimize perforating jobs with minimum efforts. The paper includes two field examples that demonstrate the software applications.Nomenclature k -permeability, md; k c -crushed zone permeability, md; k d -wellbore damage zone permeability, md.

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Comparison of Skin Factors for Perforated Completions Calculated with Computational Fluid Dynamics Software and a Semi-Analytical Model

Cited by 12 publications

References 10 publications

Insights into the Process of Effectively Acidizing Naturally Fractured Reservoirs

Insights into the Process of Effectively Acidizing Naturally Fractured Reservoirs

CFD as a Tool For Pumping Strategy Evaluation on Matrix Acidizing Treatments

Perforated Completion Optimization Using a New, Enhanced and Integrated Perforating Job Design Tool

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