Generalized inflow performance relationships for horizontal gas wells

Zhu, Ding

doi:10.1016/j.jngse.2010.05.002

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…Combining Equations ( 10) and ( 17), the two-phase flow productivity equation for horizontal well with stress 6 Lithosphere sensitivity and reservoir pressure change in unsaturated reservoirs can be established as follows:…”

Section: : ð12þmentioning

confidence: 99%

“…Accurate evaluation of stress sensitivity and its influence on well productivity is of great significance to optimize the well working system in these kinds of reservoirs and thus can improve oil recovery and save production cost at the same time. As an ancient but important method, inflow performance analysis has been widely used for its simplicity and practicality to evaluate and predict well productivity in production and reservoir engineering [6][7][8][9], and it is also the main research method adopted in this study.…”

Section: Introductionmentioning

confidence: 99%

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Inflow Performance Analysis of a Horizontal Well Coupling Stress Sensitivity and Reservoir Pressure Change in a Fractured-Porous Reservoir

Wang¹,

Fan

Zhao

et al. 2021

Lithosphere

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Stress sensitivity has always been a research hotspot in fractured-porous reservoirs and shows huge impacts on well productivity during the depletion development. Due to the continuous reservoir pressure change, accurate evaluation of stress sensitivity and its influence on well productivity is of great significance to optimize well working system. Taking horizontal well trajectory as the research object, the principal focus of this work is on the analysis of inflow performance for a horizontal well coupling stress sensitivity and reservoir pressure change in a fractured-porous reservoir. Firstly, a relationship between permeability damage rate and stress sensitivity coefficient was established to quantitatively evaluate the influence of reservoir pressure and stress sensitivity on reservoir permeability. Secondly, considering stress sensitivity and reservoir pressure drop, a set of practical productivity equations were derived for a horizontal well in a fractured-porous reservoir by adopting the equivalent seepage resistance method. Finally, the influence of relevant important factors on the inflow performance of horizontal wells was discussed in depth. Results show that a positive correlation exists between stress sensitivity coefficient and maximum permeability damage rate. At the same maximum permeability damage rate, high initial reservoir pressure corresponds to low stress sensitivity coefficient. In general, stress sensitivity coefficient mainly ranges from 0 to 0.2. Reservoir pressure change drastically affects the production dynamic characteristics of horizontal wells, and both the inflow performance curve and the production index curve decline and shrink as reservoir pressure decreases. Stress sensitivity is negatively correlated with horizontal well productivity, and the inflow performance/production index curve bends closer to bottom-hole pressure axis, and an inflection point can be observed with the aggravation of stress sensitivity. In addition, horizontal wellbore length and initial reservoir permeability also show significant effects on the inflow performance and are positively correlated with well productivity. For water cut, it has little effect on the well production when bottom-hole pressure drawdown is low, but its effect gets stronger as the drawdown becomes higher. Meaningfully, depending on these newly established productivity equations, a reasonable production system can be quantitatively optimized and achieved for the horizontal wells in fractured-porous reservoirs.

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Section: : ð12þmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inflow Performance Analysis of a Horizontal Well Coupling Stress Sensitivity and Reservoir Pressure Change in a Fractured-Porous Reservoir

Wang¹,

Fan

Zhao

et al. 2021

Lithosphere

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“…However, this method had a tedious process and did not consider reservoir anisotropy. Tabatabaei [13] first considered the three different boundary conditions of dynamic inflow analysis and prediction. He studied the internal qualitative relationship between transient-state pressure behaviors and inflow performance of the wells, but he did not establish any inflow performance evaluation model.…”

Section: State Of the Artmentioning

confidence: 99%

Effective Model to Evaluate the Inflow Performance of Highly Deviated Wells in Anisotropic Reservoirs

Zhao¹,

Wang²,

Xue³

2018

JESTR

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Inflow performance evaluation is an important basis for the completion design of highly deviated wells, but existing evaluation models do not consider reservoir anisotropy or well deviation angle with long calculation time and certain limitations. In order to perfect the inflow performance evaluation model of highly deviated wells, a high-efficiency model evaluating their inflow performance in anisotropic reservoirs was proposed in this study. On the basis of a source function method, an oil reservoir-wellbore coupling flow equation was established, and a new model that can evaluate inflow performance of highly deviated wells in anisotropic reservoirs was proposed by introducing the anisotropic quantitative characterization method. On this basis, the influence laws of anisotropy and well deviation angle on inflow morphology, potential section, and productivity of highly deviated wells were discussed. Results indicate that the new model can consider the influences of reservoir anisotropy and well deviation on inflow performance, and the calculation only consumed 1/30 of the traditional model. Reservoir anisotropy has a great influence on the inflow performance of highly deviated wells. The smaller the anisotropy coefficient, the earlier the transient-state flow appears in the transition phase, and the later the steady-state flow appears in the subsequent phases. Anisotropy coefficient has an apparent influence on flow velocity in the wellbore, and flow rates at two ends of the wellbore decrease by 32.3% when the anisotropy coefficient increases from 1/100 to 100. The influence of well deviation angle on the highly deviated well production is enhanced as the anisotropy coefficient increases. The study contributes to the highly efficient evaluation of the inflow performance of highly deviated wells and provides a certain reference for the optimization of highly deviated wells and production forecast.

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A Mathematical Model of Coupled Gas Flow and Coal Deformation with Gas Diffusion and Klinkenberg Effects

et al. 2014

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Generalized inflow performance relationships for horizontal gas wells

Cited by 13 publications

References 19 publications

Inflow Performance Analysis of a Horizontal Well Coupling Stress Sensitivity and Reservoir Pressure Change in a Fractured-Porous Reservoir

Inflow Performance Analysis of a Horizontal Well Coupling Stress Sensitivity and Reservoir Pressure Change in a Fractured-Porous Reservoir

Effective Model to Evaluate the Inflow Performance of Highly Deviated Wells in Anisotropic Reservoirs

A Mathematical Model of Coupled Gas Flow and Coal Deformation with Gas Diffusion and Klinkenberg Effects

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