The lifetime performance prediction of fractured horizontal wells in tight reservoirs

MoradiDowlatabad, Mojtaba; Jamiolahmady, Mahmoud

doi:10.1016/j.jngse.2017.02.041

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…In this appendix, the pseudo-steady-state flow is studied to demonstrate that the four types of coupling between the high Kn effect and non-ideal gas effect also exist in non-steady-state flow. A pseudo-steady state may occur during the boundary dominated flow period, which is at the late stage of gas exploitation (Wang & Economides 2009;MoradiDowlatabad & Jamiolahmady 2017). Recently, this flow type has been applied to the production prediction of multi-fractured horizontal wells, which is essential for shale gas exploitation (Guo, Wang & Zhang 2016;Wei et al 2016;MoradiDowlatabad & Jamiolahmady 2017).…”

Section: Appendixmentioning

confidence: 99%

“…A pseudo-steady state may occur during the boundary dominated flow period, which is at the late stage of gas exploitation (Wang & Economides 2009;MoradiDowlatabad & Jamiolahmady 2017). Recently, this flow type has been applied to the production prediction of multi-fractured horizontal wells, which is essential for shale gas exploitation (Guo, Wang & Zhang 2016;Wei et al 2016;MoradiDowlatabad & Jamiolahmady 2017). Pseudo-steady state assumes that the pressure drops at a constant rate at every point of the field, and there is no flux at the drainage boundary (Ahmed & McKinney 2005;Wang & Economides 2009).…”

Section: Appendixmentioning

confidence: 99%

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Coupling of high Knudsen number and non-ideal gas effects in microporous media

Wang

Chen

2018

J. Fluid Mech.

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High Knudsen number non-ideal gas flows in porous media are important and fundamental in various applications including shale gas exploitation and carbon dioxide sequestration. Because of the small pore size in tight rocks, the Knudsen number (Kn) may be high (i.e. much higher than 0.01) even though the gas is really dense. In fact, due to the high pressure and temperature underground, the gas usually manifests a strong non-ideal gas effect. Understanding the coupling mechanism of the high Kn effect and non-ideal gas effect is a premise to accurately model deep-seated underground gas exploitation or carbon dioxide sequestration. In this work, we theoretically analyse the high Kn non-ideal gas flows in microporous media. Based on the relative importance of the non-ideal gas effect and high Kn effect, the coupling is divided into four types. The analysis is subsequently validated by multiscale numerical simulations, in which the four types of coupling are clearly demonstrated. After applying the analysis to laboratory measurements, we propose a characteristic pressure model to calculate the gas permeability of tight rocks with better precision. The new model incorporates the non-ideal gas effect with the high Kn effect accurately and better bridges the laboratory measurements with the reservoir engineering.

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Section: Appendixmentioning

confidence: 99%

Section: Appendixmentioning

confidence: 99%

Coupling of high Knudsen number and non-ideal gas effects in microporous media

Wang

Chen

2018

J. Fluid Mech.

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The performance evaluation and design optimisation of multiple fractured horizontal wells in tight reservoirs

MoradiDowlatabad

Jamiolahmady

2018

Journal of Natural Gas Science and Engineering

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Maximizing fracture productivity in unconventional fields; analysis of post hydraulic fracturing flowback cleanup

Nasriani

Jamiolahmady

2018

Journal of Natural Gas Science and Engineering

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Highlights Hydro-fracturing is extensively used to increase the well productivity index, particularly in unconventional, tight and ultra-tight reservoirs.  This expensive procedure, though, sometimes fails to meet expectations regarding the production enhancement. The leading explanations for this reduced performance is fracture clean-up inefficiency of the fracturing fluid (FF) that was primarily injected.  In this study, a parametric investigation of FF clean-up effectiveness of fractures was performed with 143360 simulations (in 35 different sets) including injection, shut-in and production stages.  Results pointed out that in general, factors that control the mobility of FF inside the fracture had the most significant impact on cleanup efficiency.  Conversely, in tight and ultratight sets, particularly when the applied pressure drawdown for the duration of production stage was small, the impact of fluid mobility within the matrix on gas production loss was more noticeable, i.e., it is crucial how fluids flow inside the matrix rather than how fast fracture is cleaned.  The larger the Pc the lower the production loss.  The impact of Pc on GPL minimisation was stronger when pressure drawdown was small and/or shut-in time was prolonged.  As the formation becomes tighter, this observation was more pronounced, in other words, for such formations, the impact of a change in pressure drawdown and/or shut-in time on Pc and GPL was more noticeable.  The impact of Pc on minimising GPL is less noticeable in shorter fractures and vice versa. As the length of fracture reduced, quicker fracture clean-up was detected compared to those for longer fracture.  These discoveries help us to better understand the hydraulic fracturing process and can be used to settle issues regarding the performance of hydraulic fracturing and to improve the design of hydro-fracturing operations, which is an expensive but popular stimulation method for tight and ultra-tight reservoirs.

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The lifetime performance prediction of fractured horizontal wells in tight reservoirs

Cited by 4 publications

References 16 publications

Coupling of high Knudsen number and non-ideal gas effects in microporous media

Coupling of high Knudsen number and non-ideal gas effects in microporous media

The performance evaluation and design optimisation of multiple fractured horizontal wells in tight reservoirs

Maximizing fracture productivity in unconventional fields; analysis of post hydraulic fracturing flowback cleanup

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