Inflow performance relationship of vertical wells in fractured vuggy media during semi-steady state flow regime

Youssef, AbdAllah A.

doi:10.1016/j.petrol.2019.02.015

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…By comparing the predictions from the Eq. ( 22) and numerical solution and analytical solutions of the fluid flow equations of fractured-vuggy media, Youssef [47] validated the model Eq. (22).…”

Section: Geofluidsmentioning

confidence: 84%

See 1 more Smart Citation

A New Model for Predicting Flow in Fractured-Vuggy Carbonate Reservoirs under Pseudosteady State Condition

Cao

Lei

et al. 2021

Geofluids

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For constant rate production of a single well in a closed boundary fractured-vuggy carbonate reservoir, when the pressure wave propagates to the reservoir boundaries, boundary-dominated flow occurs, and the transient flow period ends, the reservoir will be in a state of pseudoequilibrium (i.e., pseudosteady state flow occurs, and the pressure at any point in the reservoir declines at the same constant rate over time). The characterization of fluid flow in the fractured-vuggy carbonate reservoir under pseudosteady state condition is of significance in describing the productivity index (PI) of the well. However, due to complex mechanisms (e.g., stress dependency of reservoir properties and crossflow between different systems of the reservoirs) during flow in fractured-vuggy carbonate reservoirs, researches on productivity prediction in fractured-vuggy carbonate reservoirs under pseudosteady state are very limited. The present work is aimed at developing a new analytical model for predicting flow in fractured-vuggy carbonate reservoirs under pseudosteady state condition. In the derived model, the crossflow between different systems (i.e., matrix, fracture, and vug) of the reservoirs was taken into account. In addition, based on Hooke’s law, a quantitative model was proposed to study stress-dependent permeability of the fracture system, which connects the reserve spaces. Moreover, the roughness morphology characteristics of fracture surface were taken into account with fractal theory. Finally, with our derived model, influences caused by various related factors on productivity were analyzed. The results show that well productivity during pseudosteady flow will be significantly affected by the morphology of fracture surface (e.g., fracture microstructure parameters) and effective stress. Specifically, due to effective stress, the fracture system in the fractured-vuggy reservoirs will be deformed, and the corresponding properties (e.g., permeability, porosity, and conductivity) will change, leading to the change of well productivity. In addition, there exists a negative relationship between the elastic storage capacity ratio of vugs and well productivity during pseudosteady flow. Moreover, a larger value of matrix-fracture interporosity flow coefficient or vug-fracture interporosity flow coefficient corresponds to a larger value of well productivity during the pseudosteady period. The new derived model is beneficial to improve the productivity prediction accuracy and reduce uncertainty. What is more, the findings of this study can help for providing theoretical reference for the design of efficient development of fractured-vuggy carbonate reservoirs.

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Section: Geofluidsmentioning

confidence: 84%

“…Recently, Youssef [47] derived an analytical model to study IPR curve of fractured-vuggy carbonate reservoirs, which was…”

Section: Model Validationmentioning

confidence: 99%

A New Model for Predicting Flow in Fractured-Vuggy Carbonate Reservoirs under Pseudosteady State Condition

Cao

Lei

et al. 2021

Geofluids

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“…where F ðFGÞ is the average normalized load of the FG section, F ðBCÞ is the average normalized load of the BC section, k ðEFÞ is 2 Geofluids the slope of the EF section, ΔS ðFGÞ is the displacement of the FG section, and ΔS ðBCÞ is the displacement of the BC section. The eigenvalues of the dynamometer card with abnormal "boss" in section BC are as follows:…”

Section: Identification Of Abnormal Bc Sectionmentioning

confidence: 99%

“…The inflow performance relationship (IPR) curve of oil well is a curve describing the relationship between oil well production and bottom hole flowing pressure [1][2][3], which is the basis of well performance analysis and productivity prediction [4][5][6][7][8][9]. However, many classical calculation methods of IPR curve have their limitations in practical application.…”

Section: Introductionmentioning

confidence: 99%

Calculation Method for Inflow Performance Relationship in Sucker Rod Pump Wells Based on Real-Time Monitoring Dynamometer Card

Zhang

Yin

Xiao³

et al. 2020

Geofluids

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Based on the informatization and intelligent construction of an oilfield, this paper proposes a new method for calculating inflow performance relationship in sucker rod pump wells, which solves the limitations of current IPR curve calculation method in practical application. By analyzing the forming principle of the dynamometer card, the plate of abnormal dynamometer card is created innovatively, and the recognition model of abnormal dynamometer card based on “feature recognition” is established to ensure the accuracy of the dynamometer card. By analyzing the curvature of each point on the curve of downhole pump dynamometer card, the opening and closing points of standing valve and traveling valve are determined, and the models for calculating fluid production and bottom hole flowing pressure are established to obtain the data of fluid production and bottom hole flowing pressure of sucker rod pump wells. Finally, a calculation model of inflow performance relationship fitted with the calculated fluid production and bottom hole flowing pressure data based on genetic algorithm is established to realize calculation of oil well inflow performance relationship curve. The field application and analysis results show that the inflow performance relationship curve calculated by the model in this paper fits well with the measured data points, indicating that the calculation model has high accuracy and can provide theoretical and technical support for the field. Moreover, the real-time acquisition of dynamometer cards can provide real-time data source for this method, improve the timeliness of oil well production analysis, and help to reduce the production management costs and improve the production efficiency and benefit.

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“…In stress-sensitive reservoirs, the absolute permeability of rocks can change with the variation of the pore pressure and stress state, which has a significant impact on reservoir productivity. Understanding the characteristics of the IPR (Huang et al, 1995;Jahanbani and Shadizadeh, 2009;Qasem et al, 2014;Changalvaie et al, 2015;Youssef, 2019;Zhang et al, 2020) is vital for evaluating the performance of a well and designing an optimal stimulation. The primary objective of this study was to provide a rapid and cost-efficient methodology to evaluate reservoir productivity in stress-sensitive reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Single-phase inflow performance relationship in stress-sensitive reservoirs

Wang¹,

Gong²,

Huang³

et al. 2021

Adv. Geo-Energy Res.

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For stress-sensitive reservoirs, understanding the characteristics of the inflow performance relationship is vital for evaluating the performance of a well and designing an optimal stimulation. In this study, a reservoir simulator was used to establish the inflow performance relationship of a well for a wide variety of reservoirs and wellbore conditions. First, a base case was simulated using typical reservoir, wellbore, and fluid parameters. Subsequently, variations from the base case were investigated. The results of the simulation indicate that the dimensionless inflow performance relationship in the stress-sensitive reservoir is similar to the Vogel-type inflow performance relationship, which is used for evaluating the productivity of a vertical well in a solution-gas-drive reservoir. Unlike the two-phase flow in a solution-gas-drive reservoir, the nonlinear characteristic of the inflow performance relationship in stress-sensitive reservoirs is caused by stress-dependent permeability. Furthermore, the stress sensitivity level is the only parameter that affects the nonlinearity coefficient of the dimensionless inflow performance relationship equation. The nonlinearity coefficient was plotted against the stress sensitivity index, and the nonlinearity coefficient was found to be linearly proportional to the stress sensitivity index. This study provides a realistic and less expensive methodology to evaluate the reservoir productivity of stresssensitive reservoirs when the reservoir stress sensitivity level is known and to predict the reservoir stress sensitivity level when the inflow performance relationship of the stresssensitive reservoirs is known.

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Inflow performance relationship of vertical wells in fractured vuggy media during semi-steady state flow regime

Cited by 4 publications

References 11 publications

A New Model for Predicting Flow in Fractured-Vuggy Carbonate Reservoirs under Pseudosteady State Condition

A New Model for Predicting Flow in Fractured-Vuggy Carbonate Reservoirs under Pseudosteady State Condition

Calculation Method for Inflow Performance Relationship in Sucker Rod Pump Wells Based on Real-Time Monitoring Dynamometer Card

Single-phase inflow performance relationship in stress-sensitive reservoirs

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