Multiphase Rate-Transient Analysis in Unconventional Reservoirs: Theory and Application

Uzun, Ilkay; Kurtoglu, Basak; Kazemi, Hossein

doi:10.2118/171657-pa

Cited by 46 publications

(6 citation statements)

References 11 publications

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“…Applications of the transient production data analysis theory to shale oil wells are also demonstrated by previous investigators [30][31][32]. Figure 3 shows a diagnostic plot of rate transient data for flow regime identification.…”

Section: Transient Rate Analysis For Fracture Interference Identificamentioning

confidence: 52%

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

Yang

Guo

2019

Energies

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A data-driven workflow approach is presented in this study for optimizing fracture spacing of multifractured horizontal wells (MFHW) in shale oil reservoirs. The workflow employs a simple well productivity model for the initial design of hydraulic fracturing well completions. This provides a transparent approach to the identification of key fracturing parameters affecting well productivity. The workflow uses transient pressure or production data to identify fracture interference. This offers a reliable and cost-effective means for assessment of well production potential in terms of optimization of fracture spacing in the MFHW. Result of a field case study indicated that three wells were drilled in an area with dense natural fractures, and the fracture spacing of MFHW in this area was short enough to effectively drain the stimulated reservoir volume (SRV), while the other three wells were drilled in an area with less natural fractures, and the fracture spacing of MFHW in this area could be shortened to double well productivity.

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Section: Transient Rate Analysis For Fracture Interference Identificamentioning

confidence: 52%

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

Yang

Guo

2019

Energies

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“…The methods presented herein for correcting for water will continue to be tested with simulation and field cases to evaluate their practical limits. For Scenario 1, another method for linear flow analysis that may be applicable to the three-phase case studied in this work is that of Uzun et al (2016). Those authors use an approach analogous to Perrine's method, which uses the total mobility concept.…”

Section: Discussionmentioning

confidence: 99%

“…Very recently, Qanbari and Clarkson (2016) used the dynamic drainage area approach to derive a modified, and approximate, linear flow analysis technique that accounts for two-phase flow of gas and oil. With the exception of the work of Shahamat and Clarkson (2017) for boundary-dominated flow, and Uzun et al (2016) for transient flow, none of these previous studies considered simultaneous flow of gas, oil and water in the reservoir. In the current study, simultaneous flow of water, oil and gas is considered for transient linear flow analysis of tight oil wells.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Formation Water into Rate-Transient Analysis of Tight Oil Wells with High Water-Oil Ratio: A Field Example from North America

Qanbari

Clarkson

Shahamat

2017

SPE Western Regional Meeting

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Analysis of water production from multi-fractured horizontal wells in tight oil reservoirs has been mostly limited to analytical and/or numerical modeling of early-time fracture water production during flowback. During the flowback period, flush production of water occurs with a rapid decline in water rate. The rapid decline in water rate has tempted practitioners to ignore the impact of water production on rate-transient analysis (RTA) of multi-fractured horizontal wells (MFHWs) during the online production period. However, some tight oil reservoirs exhibit high water-oil ratios (WORs) throughout their production history. In these cases, water production should be included in RTA to ensure accurate hydraulic fracture characterization, short-and long-term rate forecasting, and fluid-in-place estimation, amongst other applications.In this study, two analytical methods are developed for incorporating formation water production into RTA of tight oil reservoirs producing during the transient linear flow period based on two scenarios: 1) water and oil producing from the same reservoir layer and 2) water and oil producing from different reservoir layers. For the first scenario, an estimate of formation water saturation is obtained using WOR history which, in turn, is used in an analytical method (facilitated by decoupling of phase saturations and pressure) to correct the single-phase oil or two-phase oil and gas RTA results. For the second scenario, the linear flow parameters calculated from corrected linear flow analysis of hydrocarbon (single-phase oil or two-phase oil and gas) and water layers are combined to obtain the total linear flow parameter.Practical application of the proposed analytical methods is demonstrated using a field example from a North American tight oil reservoir (with formation WOR ~ 1.3). The studied MFHW was first historymatched using the two water production scenarios -the linear flow parameter was then calculated based on the simulation model match parameters. The results of the analytical methods used to correct for water production (for the two scenarios) were then compared with the numerical simulation results and determined to be within acceptable engineering error (10 %). This study further reveals that neglecting formation water production in RTA of this well leads to unacceptable errors (exceeding 100%) in the linear flow parameter estimates.The current study provides novel practical methods for correcting RTA to account for high formation water production. The methods are proved to be robust, easy to implement, and effective in reducing the errors of the widely used single-phase oil, and recently developed two-phase oil and gas, RTA models.

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“…With the depletion of conventional oil/gas resources, tight oil and gas reservoirs have attracted great attention and become significant sources of hydrocarbon supply [1][2][3][4][5][6]. Multistage hydraulically fracturing treatments generate complex fracture networks, which enables commercial production from tight formations [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, many RTA methods have been developed or modified to account for tight gas [23,[37][38][39], tight oil [40], shale gas [33,[41][42][43][44][45][46][47], etc. Uzun et al conducted multi-phase RTA in unconventional reservoirs [2]. Integrated approaches are also applied to estimate the parameters and forecast production, such as the combination of analytical and empirical methods [5], the integration of straight-line analysis, type curves and reservoir simulation [39].…”

Section: Introductionmentioning

confidence: 99%

An Improved Rate-Transient Analysis Model of Multi-Fractured Horizontal Wells with Non-Uniform Hydraulic Fracture Properties

Cheng

Rui

et al. 2018

Energies

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Although technical advances in hydraulically fracturing and drilling enable commercial production from tight reservoirs, oil/gas recovery remains at a low level. Due to the technical and economic limitations of well-testing operations in tight reservoirs, rate-transient analysis (RTA) has become a more attractive option. However, current RTA models hardly consider the effect of the non-uniform production on rate decline behaviors. In fact, PLT results demonstrate that production profile is non-uniform. To fill this gap, this paper presents an improved RTA model of multi-fractured horizontal wells (MFHWs) to investigate the effects of non-uniform properties of hydraulic fractures (production of fractures, fracture half-length, number of fractures, fracture conductivity, and vertical permeability) on rate transient behaviors through the diagnostic type curves. Results indicate obvious differences on the rate decline curves among the type curves of uniform properties of fractures (UPF) and non-uniform properties of fractures (NPF). The use of dimensionless production integral derivative curve magnifies the differences so that we can diagnose the phenomenon of non-uniform production. Therefore, it's significant to incorporate the effects of NPF into the RDA models of MFHWs, and the model proposed in this paper enables us to better evaluate well performance based on long-term production data.

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Multiphase Rate-Transient Analysis in Unconventional Reservoirs: Theory and Application

Cited by 46 publications

References 11 publications

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

Incorporation of Formation Water into Rate-Transient Analysis of Tight Oil Wells with High Water-Oil Ratio: A Field Example from North America

An Improved Rate-Transient Analysis Model of Multi-Fractured Horizontal Wells with Non-Uniform Hydraulic Fracture Properties

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