Pressure-Transient Behavior for a Horizontal Well Intersecting Multiple Random Discrete Fractures

Guo, Genliang; Evans, R.D.; Chang, Min

doi:10.2118/28390-ms

Cited by 27 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike vertical wells, horizontal wells are often fractured at more than one point along the lateral section. Guo et al (1994) and Raghavan et al (1997) developed analytical models to predict the performance of horizontal wells intercepted by multiple transverse fractures. Also, Chen and Raghavan (1997) derived expressions for the pressure transient behavior of a multi-fractured horizontal well in a rectangular drainage region.…”

Section: Rta Workflowmentioning

confidence: 99%

Comparison of Numerical vs Analytical Models for EUR Calculation and Optimization in Unconventional Reservoirs

Moinfar¹,

Erdle²,

Patel³

2016

SPE Low Perm Symposium

View full text Add to dashboard Cite

Analytical models available in Rate-Transient-Analysis (RTA) packages are widely used as tools for history matching and forecasting production in unconventional resources. There has also been an increasing interest in the use of numerical simulation of unconventional reservoirs. In this study, we use both methods to history match the production of hydraulically fractured unconventional wells, followed by forecasting future production to establish a well's EUR (Estimated Ultimate Recovery) for reserves determination purposes. This study's goal is to quantify the differences one might expect to encounter in a well's EUR when using analytical model-based RTA vs numerical simulation-based workflows in unconventional reservoirs.First, we consider an undersaturated shale oil reservoir as a base model for this study. The base case also satisfies all assumptions inherent to analytical solution-based methods such as homogenous reservoir properties and fully-penetrating planar fractures. An excellent match between results of both methods for the base model validates the numerical simulation approach. We then impose a series of real-world deviations from RTA assumptions and investigate reliability of EUR predictions made by both approaches. In all cases, historical data and reference EURs are derived from finely-gridded numerical simulations.Example results show that, in the presence of real-world deviations from RTA assumptions, analytical models can still match the historical production data; however, key reservoir and fracture parameters need to be modified drastically to compensate for the lack of sufficient physics in the analytical models. Results show that the analytical solution-based history-matched models are not predictive for future production, and somewhat surprisingly provide pessimistic EURs in all real-world scenarios investigated in this work. For the cases presented in this study, analytical models under-predict EURs by 6-17% when two years of production history is available for matching. The underestimation of EUR increases drastically (up to 60%) as the length of available historical data decreases from 2 years to 3 months.For all cases, we also apply an efficient numerical simulation-based workflow for probabilistic forecasting of EURs. This workflow provides multiple history-matched models that are constrained by historical production data. The probabilistic forecast method employed in this work provides P90 (conservative), P50 (most likely), and P10 (optimistic) values for EUR. In all examples, the range of P90 to P10 EUR values includes the reference EUR, and the P50 values are within 2.2% of the reference EUR.

show abstract

Section: Rta Workflowmentioning

confidence: 99%

Comparison of Numerical vs Analytical Models for EUR Calculation and Optimization in Unconventional Reservoirs

Moinfar¹,

Erdle²,

Patel³

2016

SPE Low Perm Symposium

View full text Add to dashboard Cite

show abstract

“…Guo et al developed an analytical method for horizontal well intersecting multiple fractures [14]. However, the interference of the fractures was neglected.…”

Section: Introductionmentioning

confidence: 99%

Pressure Transient Behavior of Horizontal Well with Time-Dependent Fracture Conductivity in Tight Oil Reservoirs

et al. 2017

View full text Add to dashboard Cite

This work presents a discussion on the pressure transient response of multistage fractured horizontal well in tight oil reservoirs. Based on Green's function, a semianalytical model is put forward to obtain the behavior. Our proposed model accounts for fluid flow in four contiguous regions of the tight formation by using pressure continuity and mass conservation. The time-dependent conductivity of hydraulic fractures, which is ignored in previous models but highlighted by recent experiments, is also taken into account in our proposed model. We also include the effect of pressure drop along a horizontal wellbore. We substantiate the validity of our model and analyze the different flow regimes, as well as the effects of initial conductivity, fracture distribution, and geometry on the pressure transient behavior. Our results suggest that the decrease of fracture conductivity has a tremendous effect on the well performance. Finally, we compare our model results with the field data from a multistage fractured horizontal well in Jimsar sag, Xinjiang oilfield, and a good agreement is obtained.

show abstract

“…For instance, Hegre (1991, 1994) determined transient flow regimes by plotting logelog type curves. Guo et al (1994) presented an analytical method to predict the performance of MFH wells. However, the interference between fractures is neglected in these models, leading to inaccuracies in production and pressure calculations.…”

Section: Introductionmentioning

confidence: 99%

A composite model to analyze the decline performance of a multiple fractured horizontal well in shale reservoirs

Zhang

Zhao

et al. 2015

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

Pressure-Transient Behavior for a Horizontal Well Intersecting Multiple Random Discrete Fractures

Cited by 27 publications

References 16 publications

Comparison of Numerical vs Analytical Models for EUR Calculation and Optimization in Unconventional Reservoirs

Comparison of Numerical vs Analytical Models for EUR Calculation and Optimization in Unconventional Reservoirs

Pressure Transient Behavior of Horizontal Well with Time-Dependent Fracture Conductivity in Tight Oil Reservoirs

A composite model to analyze the decline performance of a multiple fractured horizontal well in shale reservoirs

Contact Info

Product

Resources

About