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Research on Quantitative Identification of Three-Dimensional Connectivity of fractured-vuggy reservoirs

Energy Engineering 2024年第5期121卷 1195-1207页

作者： Xingliang Deng Peng Cao Yintao Zhang Yuhui Zhou Xiao Luo Liang Wang Exploration and Development Research Institute PetroChina Tarim Oilfield CompanyKorla841000China PetroChina Hangzhou Research Institute of Geology Hangzhou310023China School of Petroleum Engineering Yangtze UniversityWuhan430100China

The fractured-vuggy carbonate oil resources in the western basin of China are extremely *** connectivity of carbonate reservoirs is complex,and there is still a lack of clear understanding of the development and topological structure of the pore space in fractured-vuggy ***,effective prediction of fractured-vuggy reservoirs is *** view of this,this work employs adaptive point cloud technology to reproduce the shape and capture the characteristics of a fractured-vuggy *** identify the complex connectivity among pores,fractures,and vugs,a simplified one-dimensional connectivity model is established by using the meshless connection element method(CEM).Considering that different types of connection units have different flow characteristics,a sequential coupling calculation method that can efficiently calculate reservoir pressure and saturation is *** automatic history matching,the dynamic production data is fitted in real-time,and the characteristic parameters of the connection unit are *** results show that the three-dimensional connectivity model of the fractured-vuggy reservoir built in this work is as close as 90%of the fine grid model,while the dynamic simulation efficiency is much higher with good accuracy.

关键词： fractured-vuggy reservoir three-dimensional connectivity connection unit dynamic prediction automatic history matching

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Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs

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Petroleum Exploration and Development 2022年第5期49卷 1110-1125页

作者： WANG Jing QI Xiangsheng LIU Huiqing YANG Min LI Xiaobo LIU Hongguang ZHANG Tuozheng State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China MOE Key Laboratory of Petroleum Engineering China University of PetroleumBeijing 102249China Research Institute of Exploration and Development Northwest Oilfield CompanySinopecUrumqi 830011China

To get a deeper understanding on the formation mechanisms and distribution laws of remaining oil during water flooding, and enhanced oil recovery(EOR) mechanisms by reversing water injection after water flooding, 3D visualization models of fractured-vuggy reservoir were constructed based on the elements and configuration of fractures and vugs, and typical fracture-vug structures by using advanced CT scanning and 3D printing technologies. Then, water flooding and reversing water injection experiments were conducted. The formation mechanisms of remaining oil during water flooding include inadequate injection-production well control, gravity difference between oil and water, interference between different flow channels, isolation by low connectivity channel, weak hydrodynamic force at the far end. Under the above effects, 7 kinds of remaining oil may come about, imperfect well-control oil, blind side oil, attic oil at the reservoir top, by-pass residual oil under gravity, by-pass residual oil in secondary channel, isolated oil in low connectivity channel, and remaining oil at far and weakly connected end. Some remaining oil can be recovered by reversing water injection after water flooding, but its EOR is related to the remaining oil type, fracture-cavity structure and reversing injection-production structure. Five of the above seven kinds of remaining oil can be produced by six EOR mechanisms of reversing water injection: gravity displacement, opening new flow channel, rising the outflow point, hydrodynamic force enhancement, vertically equilibrium displacement, and synergistic effect of hydrodynamic force and gravity.

关键词： fractured-vuggy reservoir water flooding remaining oil reversing water injection stimulation mechanism enhanced oil recovery 3D printing

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A novel polymer gel with high-temperature and high-salinity resistance for conformance control in carbonate reservoirs

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Petroleum Science 2022年第6期19卷 3159-3170页

作者： Wei-Peng Wu Ji-Rui Hou Ming Qu Yu-Long Yang Wei Zhang Wen-Ming Wu Yu-Chen Wen Tuo Liang Li-Xiao Xiao Unconventional Petroleum Research Institute China University of PetroleumBeijing102249China Sinopec Northwest Oilfield Company UrumqiXinjiang830000China

Plugging agents have been widely used to enhance oil recovery in fractured-vuggy carbonate ***,the harsh conditions of fractured-vuggy carbonate reservoirs yield a significant challenge in maintaining a long-term stabilization of plugging *** this work,we developed an anti-hightemperature and high-salinity polymer gel(APG)with excellent resistance to high temperature(140℃)and ultra-high salinity(240000 mg/L).The rheology and microstructure of APG were characterized before and after *** plugging tests on fractured cubic cores were conducted to quantify the plugging performance of the gel *** results showed that the Sclerglucan and Cobalt(Ⅱ)Chloride Hexahydrate filled the three-dimensional(3-D)network with various morphologies,providing extra protection to the cross-linking points of the 3D network structure of APG and thus,leading to a prolongation of the dehydration *** dehydration rate of APG was only 5%within 30days,and the strength of APG could be maintained at a rigid or near-rigid level over 150 ***,APG exhibited satisfactory shear and scour *** plugging tests showed that APG could achieve a plugging rate of 90%and demonstrate ignorable minor damage to the *** results indicate that APG can serve as a great candidate in channel plugging in fractured-vuggy carbonate reservoirs where fractures are fully developed.

关键词： Conformance control fractured-vuggy reservoir High temperature High salinity Thermal stability

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Wormholes propagation for fractured-vuggy formation:Laboratory tests,numerical simulation and field application

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Petroleum 2017年第4期3卷 438-446页

作者： Fei Liu Yu Sang Nanxing Xie Li Li Li Ran Weihua Chen Engineering Technology Research Institute Southwest Oil&Gas Field CompanyPetroChinaChengdu610017China Research and Development Center of the National Energy High Sulfur Gas reservoir Southwest Oil&Gas Field CompanyPetroChinaChengdu610017China

The propagation of wormhole is vital important for matrix acidizing and acid fracturing in carbonate *** the formation of acid dissolved wormhole is derived from heterogeneous physical and chemical transportations and *** dissolved pores,krast caves,and natural fissures are the major reservoir spaces for the Sinian dolomite formation in the Anyue gas field of the Sichuan *** were four categories of formation,which are matrix dominated,inter-breccia dissolved pore dominated,dissolved pore and cave dominated,and fissure and cave dominated,based on the development intensity and connectedness of caves and *** caves and fissures make the wormhole formation and propagation particularly ***,the 3-D topological structure of dissolved pores,vugs,fissures and throats inside cores is quantitatively scanned by CT imaging technology for its feature of vivid and ***,3-D patterns of wormhole are obtained with CT scanning after core flooding by ***,the porethroat network model is reconstructed with digital cores ***,the size and ratio of pore and throat before and after core flooding by acid is analyzed and the absolute permeability of pore scale flow is numerically simulated to understand the fundamental influence of pores and vugs distribution and connectedness on wormhole ***,the wormhole pattern gained by CT scanning and simulating with two-scale model is ***,the corrected two-scale model is utilized to simulate the wormhole propagation for matrix acidizing and acid fracturing of Sinian fractured-vuggy dolomite in Anyue gas field,Sichuan *** optimized injection rate and volume were in agreement with the characteristic matrix acidizing operating curve,which indicates that the two-scale model was suitable for matrix acidizing optimization design of such *** addition,the simulated acid etched fracture length with considering the dyn

关键词： CT scanning Digital core Dolomite Wormhole fractured-vuggy reservoir Matrix acidizing Acid fracturing

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