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Relative permeability estimation of oil-water two-phase flow in shale reservoir

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Petroleum Science 2022年第3期19卷 1153-1164页

作者： yu-liang su Ji-Long Xu Wen-Dong Wang Han Wang Shi-yuan Zhan Key Laboratory of Unconventional Oil&Gas Development Ministry of EducationQingdao 266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina

Oil-water two-phase flow is ubiquitous in shale strata due to the existence of connate water and the injection of fracturing *** this work,we propose a relative permeability model based on a modified Hagen-Poiseuille(HP)equation and shale reconstruction *** proposed model can consider the nanoconfined effects(slip length and spatially varying viscosity),oil-water distribution,pore size distribution(PSD),total organic matter content(TOC),and *** results show that the increasing contact angles of organic matters(OM)and inorganic minerals(iOM)increase the relative permeability of both oil and *** the viscosity ratio increases,the relative permeability of oil phase increases while that of water phase decreases,due to the different water-oil *** effective permeability of both oil and water decreases with the increasing ***,the relative permeability of water phase increases while that of oil phase *** increasing number and decreasing deviation angle of micro-fracture increase the effective permeability of oil and ***,microfracture has a minor effect on relative *** model can help understand oil-water twophase flow in shale reservoirs and provide parameter characterization for reservoir numerical simulation.

关键词： Shale Relative permeability Two-phase flow TOC Analytical model

Meta-Analysis of the Association between Mir-196a-2 Polymorphism and Cancer susceptibility

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Clinical oncology and cancer researeh 2012年第1期9卷 63-72页

作者： Huan Zhang yu-liang su Herbert yu Bi-yun Qian Department of Epidemiology and Biostatistics Tianjin Medical University Cancer Institute and Hospital Key Laboratory of Cancer Prevention and Therapy Tianjin Medical UniversityMinistry of Education Epidemiology Program University of Hawaii Cancer CenterHonolulu 96813HIUSA

Objective MicroRNA plays a vital role in gene expression, and microRNA dysregulation is involved in carcinogenesis. The miR- 196a-2 polymorphism rs11614913 is reportedly associated with cancer susceptibility. This meta-analysis was performed to assess the overall association of miR-196a-2 with cancer risk. Methods A total of 27 independent case-control studies involving 10,435 cases and 12,075 controls were analyzed for the rs11614913 polymorphism. Results A significant association was found between rs11614913 polymorphism and cancer risk in four genetic models （CT vs. TT, OR-1.15, 95%CI=1.05-1.27; CC vs. TT, OR=1.23, 95%CI=1.08-1.39; Dominant model, OR=1.17, 95%CI=1.06-1.30; Additive model, OR-1.08, 95%CI=1.01-1.14）. In the subgroup analysis of different tumor types, the C allele was associated with increased risk of lung, breast, and colorectat cancer, but not with liver, gastric, or esophageal cancer. In the subgroup analysis by ethnicity, a significantly increased risk of cancer was found among Asians in all genetic models, but no associations were found in the Caucasian subgroup. Conclusions The meta-analysis demonstrated that the miR-196a-2 polymorphism is associated with cancer susceptibility, especially lung cancer, colorectal cancer, and breast cancer among Asian populations.

关键词： MIRN196 microRNA human polymorphism neoplasms meta-analysis

Performance-based fractal fracture model for complex fracture network simulation

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Petroleum Science 2018年第1期15卷 126-134页

作者： Wen-Dong Wang yu-liang su Qi Zhang Gang Xiang Shi-Ming Cui School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 Shandong China CCDC Downhole Service Company Chengdu 610213 Sichuan China China National Petroleum Corporation Jilin Oil FieldXinmu Oil Production Plant Jilin 138000 China

The paper presents a novel hydraulic fracturing model for the characterization and simulation of the complex fracture network in shale gas reservoirs. We go beyond the existing method that uses planar or orthogonal conjugate fractures for representing the ＇＇complexity＇＇ of the network. Bifurcation of fractures is performed utilizing the Lindenmayer system based on fractal geometry to describe the fracture propagation pattern, density and network connectivity. Four controlling parameters are proposed to describe the details of complex fractures and stimulated reservoir volume（SRV）. The results show that due to the multilevel feature of fractal fractures, the model could provide a simple method for contributing reservoir volume calibration. The primary-and second-stage fracture networks across the overall SRV are the main contributions to the production, while the induced fracture network just contributes another 20% in the late producing period. We also conduct simulation with respect to different refracturing cases and find that increasing the complexity of the fracture network provides better performance than only enhancing the fracture conductivity.

关键词： Fractal geometry Fractal fracture model Complex fracture network characterization Contributing reservoirvolume Refracturing

A semi-analytical model for coupled flow in stress-sensitive multi-scale shale reservoirs with fractal characteristics

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Petroleum Science 2024年第1期21卷 327-342页

作者： Qian Zhang Wen-Dong Wang yu-liang su Wei Chen Zheng-Dong Lei Lei Li Yong-Mao Hao Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Shale Oil Development Branch Changqing Oilfield CompanyPetroChinaQingyang745708GansuChina PetroChina Research Institute of Petroleum Exploration&Development Beijing100083China

A large number of nanopores and complex fracture structures in shale reservoirs results in multi-scale flow of oil. With the development of shale oil reservoirs, the permeability of multi-scale media undergoes changes due to stress sensitivity, which plays a crucial role in controlling pressure propagation and oil flow. This paper proposes a multi-scale coupled flow mathematical model of matrix nanopores, induced fractures, and hydraulic fractures. In this model, the micro-scale effects of shale oil flow in fractal nanopores, fractal induced fracture network, and stress sensitivity of multi-scale media are considered. We solved the model iteratively using Pedrosa transform, semi-analytic Segmented Bessel function, Laplace transform. The results of this model exhibit good agreement with the numerical solution and field production data, confirming the high accuracy of the model. As well, the influence of stress sensitivity on permeability, pressure and production is analyzed. It is shown that the permeability and production decrease significantly when induced fractures are weakly supported. Closed induced fractures can inhibit interporosity flow in the stimulated reservoir volume (SRV). It has been shown in sensitivity analysis that hydraulic fractures are beneficial to early production, and induced fractures in SRV are beneficial to middle production. The model can characterize multi-scale flow characteristics of shale oil, providing theoretical guidance for rapid productivity evaluation.

关键词： Multi-scale coupled flow Stress sensitivity Shale oil Micro-scale effect Fractal theory

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

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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

Investigation of influence factors on CO_(2) flowback characteristics and optimization of flowback parameters during CO_(2) dry fracturing in tight gas reservoirs

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Petroleum Science 2023年第6期20卷 3553-3566页

作者： Xiao-Mei Zhou Lei Li Yong-Quan sun Ran Liu Ying-Chun Guo Yong-Mao Hao yu-liang su National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Shengli Oil Field Dongsheng Jinggong Petroleum Development(GROUP)Stock Co. Ltd.Dongying257000ShandongChina Exploration and Development Research Institute of Shengli Oilfield Company SinopecDongying257000ShandongChina

CO_(2) dry fracturing is a promising alternative method to water fracturing in tight gas reservoirs,especially in water-scarce areas such as the Loess *** CO_(2) flowback efficiency is a critical factor that affects the final gas production ***,there have been few studies focusing on the flowback characteristics after CO_(2) dry *** this study,an extensive core-to-field scale study was conducted to investigate CO_(2) flowback characteristics and CH_(4) production ***,to investigate the impact of core properties and production conditions on CO_(2) flowback,a series of laboratory experiments at the core scale were ***,the key factors affecting the flowback were analyzed using the grey correlation method based on field ***,taking the construction parameters of Well S60 as an example,a dual-permeability model was used to characterize the different seepage fields in the matrix and fracture for tight gas *** production parameters after CO_(2) dry fracturing were then *** results demonstrate that CO_(2) dry fracturing is more effective than slickwater fracturing,with a 9.2%increase in CH_(4) *** increase in core permeability plays a positive role in improving CH_(4) production and CO_(2) *** soaking process is mainly affected by CO_(2) diffusion,and the soaking time should be controlled within 12 *** the flowback pressure gradient results in a significant increase in both CH_(4) recovery and CO_(2) flowback ***,an increase in CO_(2) injection is not conducive to CH_(4) production and CO_(2) *** on the experimental and field data,the important factors affecting flowback and production were comprehensively and effectively *** results show that permeability is the most important factor,followed by porosity and effective *** flowback efficiency and the influence of proppant reflux,the injection volume should

关键词： CO_(2)fracturing Tight gas reservoir Fracturing fluid flowback Parameter optimization

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

Effect of Vibrocreeping on Soil Bearing Capacity

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Effect of Vibrocreeping on Soil Bearing Capacity

Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

作者： You-Zai Xu Senior Engineer Yao-Fu Liu yu-liang Shi Engineers, su-Lang Xin Central Research Institute of Building & Construction M.M.I.,Beijing

＜正＞This paper is dealing with the vibrocreeping behaviour of *** results of field test conducted on both sand and clay are presented,and some con- clusions have been *** reasons that cause the soil vibrocreeping are disc- cused。Based on the available data authors have introduced a practical method for determining capacity of soil under long-term vibration.

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 325-334页

作者： Xinguang Zhu Chenxi Ding Zhe sui Hong su Xu Guo School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock *** involves analyses of the evolution patterns of blasting stress,characteristics of crack distribution,and rock fracture features in the ***,blasting model experiments were carried out using the dynamic caustics principle to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock *** experimental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bottom rock ***,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion *** numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explosion becomes more pronounced,resulting in fewer cracks in the bottom rock *** illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

关键词： bottom cushion layer blasting crack propagation continuum-discontinuum element method dynamic stress intensity factor