A New Way to Diagnose Injectivity Decline During Fractured Water Injection By Modifying Conventional Hall Analysis

Ojukwu, Kelechi; Hoek, P.J. van den

doi:10.2118/89376-ms

Cited by 17 publications

(4 citation statements)

References 2 publications

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“…Several other models exist to describe fracturing, injectivity decline, formation damage, particulate mechanics and this have been published elsewhere (AbouSayed et al 2005(AbouSayed et al , 2007Al-Abduwani 2005;Bedrikovetsky et al 2007;Chang 1985;Clifford et al 1991;Davidson 1979;De Zwart 2007;Dong et al 2010;Donaldson et al 1977;Doresa et al 2012;Farajzadeh 2002;Faruk 2010;Folarin et al 2013;Furtado et al 2005;Gong et al 2013;Greenhill 2002;Guedes et al 2006;Hustedt et al 2006;Iwasaki 1937;Khatib 2007;Khodaverdian et al 2009;Lawal and Vesovic 2010;Lawal et al 2011;Li et al 2011Li et al , 2012Ojukwu and van den Hoek 2004;Sahni and Kovacevich 2007;Shuler and Subcaskey 1997;Todd 1979; Van den Hoek et al 1996;Wang and Le 2008;Wang et al 2011;Sharma et al 2000;Yerramilli et al 2013;Zeinijahromi et al 2011;Zhang et al 1993).…”

Section: Introductionmentioning

confidence: 80%

Modeling fracturing pressure parameters in predicting injector performance and permeability damage in subsea well completion multi-reservoir system

Abhulimen¹,

Fashanu²,

Idialu³

2017

J Petrol Explor Prod Technol

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The significance of fracturing parameters which are aquifer integrity, rock properties, thermal stress, fracturing pressure and produced water quality to alter permeability damage, cake formation and injectivity performance was highlighted in a robust improved internal filtrationhydraulic model and permeability reduction model incorporating a R AT ðcÞ function. The studied system is an injection well multi-reservoir formations. Field data obtained from the log and field reports and improved model were used to simulate injector, fracturing and permeability damage performance. Thus, data requirements in the R AT ðcÞ function which are rock properties, water quality, aquifer integrity, fractures rates and pressures parameters were assessed for its impact on injector performance and permeability damage simulated in MATHLAB and COMSOL multi physics environment. The profile of injector performance and damage reservoir permeability to changes in rock properties and aquifer integrity were demonstrated to have a profound influence on both fracturing phenomena. Thus, sustainable re-injection scheme was shown as a direct consequence of rock mechanics parameters, well hydraulics aquifer integrity that largely depends on the initial concentration of active constituents of the produced water as well as physic-chemical properties of the host aquifer.

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Section: Introductionmentioning

confidence: 80%

Modeling fracturing pressure parameters in predicting injector performance and permeability damage in subsea well completion multi-reservoir system

Abhulimen¹,

Fashanu²,

Idialu³

2017

J Petrol Explor Prod Technol

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“…Buell et al [2] modified it for polymer injection in EOR. Ojukwu and van den Hoek [3] state version for use in quantifying damage skin. Silin et al, [4] developed slope analysis to estimate and use the varying reservoir pressure term.…”

Section: Introductionmentioning

confidence: 99%

Modifying the Hall Plot for Analysis of Immiscible Gas Injection Wells II: IOR

Talabi¹,

Yew²

2018

IJCEA

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The Hall plot is a graph of an injection well's cumulative pressure against its cumulative injected volume, ideally presenting as straight line. Changes in the gradient of this line can indicate a change in injectivity behavior. Developed for single-phase, steady-state, radial flow of liquids, it has proven useful in the surveillance of water injection wells. However, published studies into the validity of its equations and assumptions for gas injection scenarios are limited. Utilizing the Hall plot to analyze immiscible gas injection into an oil phase for improved oil recovery poses challenges due to the near-wellbore relative permeability of gas to the oil phase. This paper presents one useful and practical approach to achieve this correction.To account for the varying near-wellbore relative permeability of gas in the oil phase, a function relating the relative permeability of gas in the oil phase to the cumulative gas injection is developed and included in previously developed equations that account for compressibility and viscosity variations. These updated equations give a modified Hall plot that accounts for the non-linearity due to relative permeability effects and allows the Hall plot to be used qualitatively by engineers to identify changes in the injectivity of gas wells.

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“…Many waterfloods have relatively long fractures caused by thermal effects, pressure depletion (poroelastic) or plugging effects [1][2][3][4][5][6][7][8][9][10][11][12][13] . These fractures may be beneficial in that they help injectivity and injection rates.…”

Section: Introductionmentioning

confidence: 99%

The Myths of Waterfloods, EOR Floods and How to Optimize Real Injection Schemes

Baker¹,

Dieva

Jobling

et al. 2016

All Days

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Waterflood implementation accounts for more than half of the oil production worldwide. Despite the observations and extensive research from a large number of floods and thousands of simulation studies, managing waterfloods and Enhanced Oil Recovery (EOR) floods is still a technical challenge. A major contributor to this challenge are waterflood induced fractures (WIF). Managing waterfloods is a multivariable problem although WIF are one aspect, it is by no means the only controlling factor.The best evidence that WIF are one of the main factors controlling flow in reservoirs is the insensitivity of injection pressure to injection rates. With our experience, in hundreds of waterfloods, we have frequently observed this phenomenon in the field data. If fluid flow depended on diffusive Darcy flow alone, we would expect higher injection rates with higher injection pressures. However, it is common to observed relatively constant injection pressures over a wide range of water injection rates. Rapid well communication and changes in water cuts that vary with injection rates also support an interpretation of high permeability induced fractures between injector and producer. In some reservoirs, interwell tracer data can be used to determine the influence of induced fracture features. The interwell tracers usually show very fast water movement.Induced fractures in waterfloods and EOR projects can be caused by a number of mechanisms such as but not limited to, pressure depletion, changing pressure regimes, thermal effects, or plugging effects. These fractures can either be beneficial to the reservoir performance or effect performance negatively. Benefits include improved injectivity and increased throughput of the displacing fluid. Negative effects can come in the form of reduced volumetric sweep efficiency, impaired ultimate recovery or injected fluid losses out of zone.Case studies, theory, and available literature from Western Canada will be reviewed in order to suggest and improve reservoir management strategies for waterfloods. We have completed hundreds of waterflood feasibility, waterflood management and EOR flood studies worldwide and continue to be amazed and humbled by the complexity that many waterfloods and EOR floods exhibit due to induced fracturing. WIF and EOR induced fractures (EIF) are common and should be analysed to optimize production. Growth of the WIF, response to waterflood with the presence of WIF, implication of WIF and reservoir management are the main areas which will be addressed.

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A New Way to Diagnose Injectivity Decline During Fractured Water Injection By Modifying Conventional Hall Analysis

Cited by 17 publications

References 2 publications

Modeling fracturing pressure parameters in predicting injector performance and permeability damage in subsea well completion multi-reservoir system

Modeling fracturing pressure parameters in predicting injector performance and permeability damage in subsea well completion multi-reservoir system

Modifying the Hall Plot for Analysis of Immiscible Gas Injection Wells II: IOR

The Myths of Waterfloods, EOR Floods and How to Optimize Real Injection Schemes

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