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Tight gas production model considering TPG as a function of pore pressure,permeability and water saturation

Petroleum Science 2020年第5期17卷 1356-1369页

作者： atif zafar Yu-Liang Su Lei Li Jin-Gang Fu Asif Mehmood Wei-Ping Ouyang Mian Zhang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Department of Petroleum Technology University of KarachiUniversity RoadKarachi 75270Pakistan Changqing Downhole Technology Company Chuangqing Drilling Engineering Co.LtdCNPCXi’an 710018ShaanxiChina

Threshold pressure gradient has great importance in efficient tight gas field development as well as for research and laboratory *** experimental study is carried out to investigate the threshold pressure gradient in *** are carried out with and without back pressure so that the effect of pore pressure on threshold pressure gradient may be *** trend of increasing or decreasing the threshold pressure gradient is totally opposite in the cases of considering and not considering the pore *** results demonstrate that the pore pressure of tight gas reservoirs has great influence on threshold pressure *** effects of other parameters like permeability and water saturation,in the presence of pore pressure,on threshold pressure gradient are also examined which show that the threshold pressure gradient increases with either a decrease in permeability or an increase in water *** new correlations of threshold pressure gradient on the basis of pore pressure and permeability,and pore pressure and water saturation,are also *** on these equations,new models for tight gas production are *** gas slip correction factor is also considered during derivation of this proposed tight gas production *** performance relationship curves based on these proposed models show that production rates and absolute open flow potential are always be overestimated while ignoring the threshold pressure gradients.

关键词： Inflow performance relationship Pore pressure Threshold pressure gradient Tight gas field development Tight gas sand reservoir

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A new model for predicting irreducible water saturation in tight gas reservoirs

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Petroleum Science 2020年第4期17卷 1087-1100页

作者： Yu-Liang Su Jin-Gang Fu Lei Li Wen-Dong Wang atif zafar Mian Zhang Wei-Ping Ouyang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Department of Petroleum Technology University of KarachiKarachiPakistan Changqing Downhole Technology Company Chuanqing Drilling Engineering Co.LtdCNPCXi’an 710018ShaanxiChina

The irreducible water saturation(Swir) is a significant parameter for relative permeability prediction and initial hydrocarbon reserves ***,the complex pore structures of the tight rocks and multiple factors of the formation conditions make the parameter difficult to be accurately predicted by the conventional methods in tight gas *** this study,a new model was derived to calculate Swir based on the capillary model and the fractal *** model incorporated different types of immobile water and considered the stress *** dead or stationary water(DSW) was considered in this model,which described the phenomena of water trapped in the dead-end pores due to detour flow and complex pore *** water film,stress effect and formation temperature were also considered in the proposed *** results calculated by the proposed model are in a good agreement with the experimental *** proves that for tight sandstone gas reservoirs the Swir calculated from the new model is more *** irreducible water saturation calculated from the new model reveals that Swir is controlled by the critical capillary radius,DSW coefficient,effective stress and formation temperature.

关键词： Fractal theory Stress dependence effect Capillary model Tight sandstone gas reservoir Irreducible water saturation

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油藏动静态数据整合在金气田油藏表征及开发中的应用

油藏动静态数据整合在金气田油藏表征及开发中的应用

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作者： atif zafar 中国石油大学(华东)

学位级别：硕士

本论文从巴基斯坦L盆地Jin气田的实际地质特征和生产状况出发,对气藏静态和动态数据整合以及在气藏特征和开发分析中的综合应用进行了研究。在Jin气田的初始开发阶段,其中断层的封闭性存在不确定性,从而导致下一步的新井设计不明确。通... 详细信息

本论文从巴基斯坦L盆地Jin气田的实际地质特征和生产状况出发,对气藏静态和动态数据整合以及在气藏特征和开发分析中的综合应用进行了研究。在Jin气田的初始开发阶段,其中断层的封闭性存在不确定性,从而导致下一步的新井设计不明确。通过本论文中运用试井分析、物质平衡方法、递减曲线分、数值模拟等方法的综合研究,解决了断层封闭的模糊性,通过方法之间的相互印证,指出本气藏中的断层是不封闭的。在通过历史拟合成功验证了断层的不封闭特征以后,对Jin气藏从驱动机理、压力分布、气藏储量、潜力区域等方面进行了开发状况评价,通过不同研究方法的相互验证,为下该气藏下一步的井位设计和开发方案优化提供了指导方向。本论文基于生产实践,利用不同方法进行综合分析,从研究方法整合上为同类气藏的开发提供了借鉴经验。

关键词：动态分析断层分析开发方案油藏表征油藏工程

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Application of 3D Reservoir Geological Model on Es1 Formation, Block Nv32, Shenvsi Oilfield, China

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Open Journal of Yangtze Oil and Gas 2020年第2期5卷 54-72页

作者： Ayman Al Rassas Shaoran Ren Renyuan Sun atif zafar Safea Moharam Zhenliang Guan Alalimi Ahmed Mohammed Alomaisi School of Petroleum Engineering China University of Petroleum (East China) Qingdao China Department of Petroleum Technology University of Karachi Karachi Pakistan College of Computer Science China University of Geosciences Wuhan China Faculty of Earth Resources China University of Geosciences Wuhan China School of Chemistry and Environment South China Normal University Guangzhou China

Three-dimensional geological modeling of reservoirs is an essential tool to predict reservoir performance and improve the understanding of reservoir uniqueness in Es1 formation. The paper focuses on the use of petrel software to build three-dimensional reservoir geological model which characterizes and assesses block Nv32 that located in the west of the Shenvsi oilfield in the south of Cangzhou city, Hebei province of China, and has an oil-bearing area of 1.4 km2. This study is depending on integration data from well logs of 22 wells which provided from geology, geophysics, and petrophysics to identify and provide precise depict of the subsurface internal structure and the reservoir heterogeneity. Input data was used to build the structural model, sedimentary facies model, petrophysical properties (porosity, permeability, saturation, and N/G model, and finally to determine the reservoir volume. The lithological facies were simulated using the assigned value method. Moreover, Petrophysical properties (Porosity, permeability, oil saturation and net to gross) were constructed for each zone using the Sequential Gaussian Simulation method to guide the distribution of petrophysical properties of Es1 formation, block Nv32. Statistical analysis of the porosity, permeability, oil saturation and N/G model present that the porosity occurrence distribution is mainly concern between 0.2% - 36.39% of block Nv32 with an average porosity value of 17.5%, permeability between 0.017 mD to 974.8 mD, having an average permeability of 59.44 mD, oil saturation between 0.00 to 0.95 having an average value of 0.22, and N/G is mainly concentrated between 0.01 to 1.00 within an average value of 0.61. This research has indicated the reliability of the three-dimensional model technique as a suitable tool to provide a sufficient understanding of petrophysical distribution. The south-western and north-western indicate that oilfield is very promising an exploratory well should be drille

关键词： 3D Reservoir Geological Model Es1 Formation Block Nv32 Structural Model Petrophysical Model

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Heat Dissipation Modeling of <i>In-Situ</i>Conversion Process of Oil Shale

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Open Journal of Yangtze Oil and Gas 2020年第2期5卷 46-53页

作者： atif zafar Yuliang Su Wendong Wang Syed Ghufran Alam Danish Khan Muhammad Yasir Ayman Alrassas Ishaq Ahmad School of Petroleum Engineering China University of Petroleum (East China) Qingdao China Department of Petroleum Technology University of Karachi Karachi Pakistan School of Geosciences China University of Petroleum (East China) Qingdao China

In-situ conversion of process of oil shale has been technically proven as a pilot field project. Gradually heating the reservoir by using subsurface electric heaters converts the oil shale reservoir kerogen into oil, gas and other producible components. This process also enhances the internal energy of the porous media as well as the subsurface fluid. Heat is transmitted in the reservoir within each fluid by different processes i.e. , due to the flow of fluid called advective process, and due to molecular diffusion where dispersive and diffusive processes take place. Heat transfer through conduction and convection mechanisms in the porous media are modeled mathematically and numerically incorporating the advective, dispersive and diffusive processes in the reservoir. The results show the production of oil and gas as a result of conversion of kerogen due to modeled heat dissipation.

关键词： Heat Dissipation In-Situ Conversion Oil Production Oil Shale

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First-principles calculation of the structural,electronic,and magnetic properties of cubic perovskite RbXF3(X = Mn,V,Co,Fe)

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Chinese Physics B 2016年第11期25卷 486-491页

作者： Muhammad Raza ur rehman Hashmi Muhammad zafar M Shakil atif Sattar Shabbir Ahmed S A Ahmad Simulation Laboratory Department of Physics The Islamia University of Bahawalpur 63100 Pakistan Department of Physics Hafiz Hayat Campus University of Gujrat Gujrat Pakistan

First-principles calculations by means of the full-potential linearized augmented plane wave method using the generalized gradient approximation with correlation effect correction（GGA＋U） within the framework of spin polarized density functional theory（DFT＋U） are used to study the structural,electronic,and magnetic properties of cubic perovskite compounds RbXF3（X = Mn,V,Co,and Fe）.It is found that the calculated structural parameters,i.e.,lattice constant,bulk modulus,and its pressure derivative are in good agreement with the previous *** results reveal that the strong spin polarization of the 3d states of the X atoms is the origin of ferromagnetism in *** energies and the magnetic moments of RbXF3 have also been *** calculated electronic properties show the half-metallic nature of RbCoF3 and RbFeF3,making these materials suitable for spintronic applications.

关键词： cubic metallic perovskite modulus correction linearized ferromagnetic augmented instance spheres

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