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Influence of matrix physical properties on flow characteristics in dual network model

Petroleum Science 2023年第4期20卷 2244-2252页

作者： Chen-Chen Wang Yong-Fei Yang Deng-Lin Han Miao-Miao Su Rong-Rong Hu Cooperative Innovation Center of Unconventional Oil and Gas Yangtze UniversityWuhan430100HubeiChina Laboratory of Reservoir Microstructure Evolution and Digital Characterization Yangtze UniversityWuhan430100HubeiChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina School of Geosciences Yangtze UniversityWuhan430100HubeiChina College of Resources and Environment Yangtze UniversityWuhan430100HubeiChina School of Petroleum Engineering Yangtze UniversityWuhan430100HubeiChina

The tight oil formation develops with microfractures and matrix pores,it is important to study the influence of matrix physical properties on flow *** first,the representative fracture and matrix samples are selected respectively in the dual media,the fracture and matrix digital rocks are constructed with micro-CT scanning at different resolutions,and the corresponding fracture and matrix pore networks are extracted,***,the modified integration method is proposed to build the dual network model containing both fracture and matrix pore-throat elements,while the geometric-topological structure equivalent matrix pores are generated to fill in the skeleton domain of fracture network,the constructed dual network could describe the geometric-topological structure characteristics of fracture and matrix pore-throat *** last,by adjusting the matrix pore density and the matrix filling domain factor,a series of dual network models are obtained to analyze the influence of matrix physical properties on flow characteristics in *** can be seen that the matrix system contributes more to the porosity of the dual media and less to the *** the decrease in matrix pore density,the porosity/permeability contributions of matrix system to dual media keep decreasing,but the decrease is not significant,the oil-water co-flow zone decreases and the irreducible water saturation increases,and the saturation interval dominated by the fluid flow in the fracture keeps *** the decrease in matrix filling domain factor,the porosity/permeability contributions of matrix system to dual media decreases,the oil-water co-flow zone increases and the irreducible water saturation decreases,and the saturation interval dominated by the fluid flow in the fracture keeps *** results can be used to explain the dual-media flow pattern under different matrix types and different fracture control volumes during tight oil production

关键词： Network integration dual media Flow characteristics Matrix pore density Matrix filling domain

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Probing the influence of secondary fracture connectivity on fracturing fluid flowback efficiency

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Petroleum Science 2023年第2期20卷 973-981页

作者： Yi-Ning Wu Li-Sha Tang Yuan Li Li-Yuan Zhang Xu Jin Ming-Wei Zhao Xiang Feng Cai-Li Dai School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China College of Chemistry and Chemical Engineering China University of Petroleum(East China)Qingdao266580ShandongChina

A deep understanding of the geometric impacts of fracture on fracturing fluid flowback efficiency is essential for unconventional oil development. Using nuclear magnetic resonance and 2.5-dimensional matrix-fracture visualization microfluidic models, qualitative and quantitative descriptions of the influences of connectivity between primary fracture and secondary fracture on flowback were given from core scale to pore network scale. The flow patterns of oil-gel breaking fluid two-phase flow during flowback under different fracture connectivity were analyzed. We found some counterintuitive results that non-connected secondary fracture (NCSF, not connect with artificial primary fracture and embedded in the matrix) is detrimental to flowbackefficiency. The NCSF accelerates the formation of oil channeling during flowback, resulting in a large amount of fracturing fluid trapped in the matrix, which is not beneficial for flowback. Whereas the connected secondary fracture (CSF, connected with the artificial primary fracture) is conducive to flowback. The walls of CSF become part of primary fracture, which expands the drainage area with low resistance, and delays the formation of the oil flow channel. Thus, CSF increases the high-speed flowback stage duration, thereby enhancing the flowback efficiency. The fracturing fluid flowback efficiency investigated here follows the sequence of the connected secondary fracture model (72%) > the matrix model (66%) > the non-connected secondary fracture model (38%). Our results contribute to hydraulic fracturing design and the prediction of flowback efficiency.

关键词： Fracturing fluid Secondary fracture connectivity Flowback efficiency dual media Microfluidic model

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A Method for Identifying Channeling Paths in Low-Permeability Fractured Reservoirs

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1781-1794页

作者： Zhenfeng Zhao Bin Li Zubo Su Lijing Chang Hongzheng Zhu Ming Liu Jialing Ma Fan Wang Qianwan Li Oil&Gas Technology Research Institute PetroChina Changqing Oilfield CompanyXi’an710000China School of Petroleum Engineering Yangtze UniversityWuhan430100China

Often oilfield fractured horizontal wells produce water flowing in multiple *** this study,a method to identify such channeling paths is *** dual-medium model is based on the principle of inter-well connectivity and considers the flow characteristics and related channeling *** Lorentz curve is drawn to qualitatively discern the geological type of the low-permeability fractured reservoir and determine the channeling direction and *** practical application of such an approach to a sample oilfield shows that it can accurately identify the channeling paths of the considered low-permeability fractured reservoir and predict production performances according to the inter-well connectivity *** a result,early detection of water channeling becomes possible,paving the way to real-time production system optimization in low-permeability fractured reservoirs.

关键词： Low-permeability fractured reservoir fracturing horizontal well interwell connectivity dual media channeling paths

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Research on Well Testing Interpretation of Low Permeability Deformed dual Medium Reservoir

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Open Journal of Applied Sciences 2023年第11期13卷 2141-2148页

作者： Meinan Wang Yue Xie Rui Zhang Guohao Zhang Jianguo Liu Bohai Oilfield Research Institute of CNOOC Ltd.-Tianjin Branch Tianjin China

Considering the influence of quadratic gradient term and medium deformation on the seepage equation, a well testing interpretation model for low permeability and deformation dual medium reservoirs was derived and established. The difference method was used to solve the problem, and pressure and pressure derivative double logarithmic curves were drawn to analyze the seepage law. The research results indicate that the influence of starting pressure gradient and medium deformation on the pressure characteristic curve is mainly manifested in the middle and late stages. The larger the value, the more obvious the upward warping of the pressure and pressure derivative curve;the parameter characterizing the dual medium is the crossflow coefficient. The channeling coefficient determines the time and location of the appearance of the “concave”. The smaller the value, the later the appearance of the “concave”, and the more to the right of the “concave”.

关键词： Low Permeability Oil Reservoirs Deformation Medium dual media Cross Flow Coefficient Well Testing Interpretation Model

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