Quantification of Recovery Factors in Downspaced Wells: Application to the Eagle Ford Shale

Sinha, Saurabh; Devegowda, Deepak; Deka, Bhabesh

doi:10.2118/185748-ms

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…The advantage of our approach is that the SRV can be predicted with a high degree of confidence prior to fracturing using 3D seismic data. Although the SRV can be inferred solely from microseismic data as shown by Sinha (2017) and Suliman et al (2013), our approach allows us to predict the anticipated SRV prior to drilling or fracturing thereby providing better controls on the EUR.…”

Section: Discussionmentioning

confidence: 99%

Seismic Inversion Based SRV and Reserves Estimation for Shale Plays

Sinha

Marfurt

Devegowda

et al. 2017

SPE Annual Technical Conference and Exhibition

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Estimation of stimulated rock volume (SRV) is the cornerstone offield development planning in shale reservoirs. The EUR has a first order dependency on the SRV and therefore its estimation is extremely critical for field development. In this paper, we propose a methodology to estimate the SRV and hence the EUR for a shale reservoir using seismic data, flow and geomechanical simulation. The backbone of our methodology is seismic inversion coupled with geomechanical simulation. We apply our technique to data acquired from the Barnett shale. In this work, we first use 3D seismic and sonic logs to perform pre-stack seismic inversion. Then, we derive the distribution of Poisson's ratio and Young's modulus in the area of interest (AOI). We constrain the porosity in our geo cellular model using a rock type model. Our rock type model for this work is based on k-means clustering on multi-well log analysis. We modeled a well in the AOI for which microseismic data is available. Weused a coupledflow and geomechanical simulator to mimic the fracturing process and the fluid volumes injected during the actual completion of the well. For geomechanical coupling, we used Barton-Bandis model in seismic inversionderived Young's modulus and Poisson's ratio 3D volumes. Next, we compare our results with the SRV obtained by an analysis of microseismic data. We reconcile differences in the model-derived SRV and then calibrate the resulting flow model and use the history-matched model for forecasting production. Our results indicate an excellent match on SRV and therefore production data. Because we usevariable geomechanical parameters along the lateral, we observe irregular SRV's and drainage areas consistent with the microseismic data. Our methodology for predicting microseismic can be used for asset evaluation, acreage prioritization and to optimize the completion design in unconventional plays.

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Section: Discussionmentioning

confidence: 99%

Seismic Inversion Based SRV and Reserves Estimation for Shale Plays

Sinha

Marfurt

Devegowda

et al. 2017

SPE Annual Technical Conference and Exhibition

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Experimental Determination of the Phase Transition Point in Gas Condensates using a Cost-Effective Semiautomated Isochoric Apparatus

Salahshoor

Fahes

2018

SPE Western Regional Meeting

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A robust high precision experimental approach to determine dew point pressure of gas condensates in the laboratory is proposed in this study. Gas condensate reservoirs have been the center of attention for numerous numerical and experimental studies for decades. Their perplexing fluid flow and phase behavior results in various production challenges including condensate banking and compositional changes due to retrograde condensation accompanying production from these reservoirs. Therefore, accurate prediction of dew point pressure (DPP) is crucial in developing long-term production plans for these reservoirs. Isochoric method, an indirect high precision way of DPP and phase transition condition determination, is commonly used in other disciplines where a clear non-visual determination of phase transition of a fixed volume of fluid is needed. This study provides an insight into this approach in determining DPP for a binary mixture of hydrocarbons. A semi-automated apparatus for measuring and monitoring equilibrium conditions along with fluid properties is designed based on the isochoric method. The apparatus provides constant volume, variable pressure (0 to 1500 psi), and variable temperature (290 to 410 K) experimental conditions. Pressure and temperature measurements are used to detect the phase transition point along the constant mole-constant volume line based on the change in the slope of this line at the transition point. Results are plotted on the phase envelope (P-T diagram) of the same mixture using different equations of state and the accuracy of each of these equations of state in providing the most reliable prediction of DPP is analyzed. Reproducibility of the data is examined and error estimation for the entire experiment is provided. This experimental method is inexpensive, less time consuming, and more accurate compared to other PVT experiments and is applicable for multicomponent systems. It does not require gas expulsion or sample recombination throughout the procedure and could be identified as the only reliable way of quantifying the effect of porous media on phase behavior.

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Investigation of Double Layer Expansion in Low-Salinity Waterflooding: Molecular Simulation Study

Mehana

Fahes

2018

SPE Western Regional Meeting

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Double layer Expansion (DLE) is proposed as one of the mechanisms responsible for Improved Oil Recovery (IOR) during Low Salinity Water Flooding (LSWF). This expansion is triggered by the overlap between the diffuse double layers. We performed molecular simulation to study this phenomenon where both kaolinite and montmorillonite are used as substrates contacting water with varying concentration of monovalent and divalent ions. Our results, and several molecular simulations, have confirmed that the location of the adsorption planes is independent of the ionic strength. However, the potential developed on these surfaces and how it decays depends on both the ionic strength and ion nature. A shrinkage is observed in the double layer for the case of low salinity, supported by both film thickness estimations and interaction energy analysis. This shrinkage, which contradicts the prevailing assumption, is consistent with molecular simulation studies, and casts some doubts on the efficiency of DLE as a mechanism for explaining IOR observed during LSWF. This brings into question the role of double layer expansion in enhancing oil recovery, and raises the need to investigate other mechanisms that could be responsible for the experimental and field observations made in this area.

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Quantification of Recovery Factors in Downspaced Wells: Application to the Eagle Ford Shale

Cited by 3 publications

References 6 publications

Seismic Inversion Based SRV and Reserves Estimation for Shale Plays

Seismic Inversion Based SRV and Reserves Estimation for Shale Plays

Experimental Determination of the Phase Transition Point in Gas Condensates using a Cost-Effective Semiautomated Isochoric Apparatus

Investigation of Double Layer Expansion in Low-Salinity Waterflooding: Molecular Simulation Study

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