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Acoustic response characteristics of unsaturated porous media

Science China(Physics,Mechanics & Astronomy) 2010年第8期53卷 1388-1396页

作者： ZHAO HaiBo WANG XiuMing CHEN ShuMin LI LaiLin Research Institute of Exploration and development Daqing OilField Co.Ltd.Daqing 163712China State Key Laboratory of Acoustics Chinese Academy of SciencesBeijing 100080China

By employing the plane wave analysis method, the dispersion equations associated with compressional and shear waves using Santos’s three-phase poroelastic theory were driven. considering the reservoir pressure, the high frequency corrections and the coupling drag of two fluids in pores, the influences of frequency and gas saturation on the phase velocities and the inverse quality factors of four body waves predicted by Santos’s theory were discussed in detail. The theoretical velocities of the fast compressional and shear waves were compared with the results of the low and high frequency experiments from open publications, respectively. The results showed that they are in good agreement in the low frequency case rather than in the high frequency case. In the latter case, several popular poroelastic models were considered and compared with the experimental data. In the models, the results of White’s theory fit the experimental data, but the parameter b in White’s model has a significant impact on the results. Under the framework of the linear viscoelasticity theory, the attenuation mechanism of Santos’s model was extended, and the comparisons between the experimental and theoretical results were also made with respect to attenuation. For the case of water saturation less than 90%, the extended model makes good predictions of the inverse quality factor of shear wave. There is a significant difference between the experimental and theoretical results for the compressional wave, but the difference can be explained by the experimental data available.

关键词： unsaturated porous media poroelastic media phase velocity attenuation

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Reservoir-forming conditions and key exploration & development techniques for Xushen gas field in Northeast China

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Petroleum Research 2019年第2期4卷 125-147页

作者： Fenglan Wang Yongzhuo Wang Xuemin Zhou Changhai Yin Ping Shu Baojun Cao Yingkang Zhu Exploration and development Research Institute Daqing Oilfield Co.Ltd.Daqing163712China

Exploration and development of volcanic gas reservoirs is a world-class problem,and less experience can be learned at home and *** study of reservoir-forming conditions of Xushen gas field,four sets of hydrocarbon source rocks,mainly mudstone and coal seam of Shahezi Formation,are identified in this gas field;its cap rocks are mudstone in Member 2 of Denglouku Formation,and Member 1 and Member 2 of Quantou *** simulating reservoir-forming history,four filling periods of the Xushen gas field are determined,and the most favorable exploration targets are crater areas with structural highs,large thickness and good physical *** the basis of diagenetic mechanism study,the criteria of sequence series,lithology identification and reservoir types of gas reservoirs have been established;the volcanic rock bodies have been carefully depicted and the distribution laws of effective reservoirs of gas pools have been figured *** on evaluating reservoir-permeability characteristics of reservoirs,the gas well productivity characteristics(mainly type II,III and IV wells)have been identified,and the optimum design technology for volcanic gas reservoir development has been *** gas reservoirs in all blocks of Xushen gas field are classified into three types:singlebody gas reservoir model,disconnected multi-body gas reservoir model and interconnected multi-body gas reservoir *** technologies,including multi-layer fracturing of vertical well,staged fracturing of open-hole horizontal well and volume fracturing,have been *** to gas well production performance,pressure change,well-controlled reserves and spatial distribution of volcanic bodies,combined with numerical simulation and prediction of gas reservoirs,the evaluation method of residual potential of volcanic gas reservoirs has been *** technologies for effective exploration and development of complex volcanic gas reservoirs have been established and perf

关键词： Xushen gas field Reservoireforming conditions Volcanic rock development Productivity Optimum design

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Characteristics of breccia lava reservoirs and analysis of their dominant factors: case study of the Xushen gas field located in the Songliao Basin

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Mining Science and Technology 2010年第1期20卷 109-114页

作者： WANG Zhiqiang LIU Chengzhi WANG Wenguang TIAN Zhao LI Minghui SUN Wei college of Resources and Information China University of Petroleum Beijing 102249 China School of Earth Sciences Daqing Petroleum Institute Daqing 163318 China Hulunbei'er Branch company Daqing Oilfield Co. Ltd. Hailaer 021008 China daqing yushulin oilfield development co. Ltd. Daqing 163453 China Drilling Technology Service company No. 1 Daqing Drilling & Exploration Engineering Corporation Daqing 163000 China

Breccia lava is a type of rock in transition between volcanic clastic rock and lava. Its physical properties are compara-tively special, while the nature of its genesis and the formation of reservoirs, deposits and concentrations vary considerably. In order to discover the different genesis for breccia lava reservoirs, our study has been carried out on breccia lava for its rock constituents, structures, diagenesis and reconstruction from tectonic movements to mineral depositions. From our analysis, we conclude that the main type of reservoir is a secondary emposieu, where rock compositions, structures, diagenesis and tectonic action are the major contributing factors to the deposition of breccia lava and its properties. Diagenesis constrained the extent of conservation of the primary pore of breccia lava and produced secondary porosity. The roles of tectonics were played out through the formation controlling tectonic fissures inside breccia lava and affected the impermeability of breccia lava fluids. The constituents of lava rock determine directly the type of diagenesis and its response to tectonic action. At the time of appropriate rock composition and structures, constructive formation occurred to breccia lava. Breccia lava also responded proactively to tectonic movements, forming the best quality collective reservoir agglomerations of vast spaces and strong permeability.

关键词： breccia lava diagenesis volcanic rock reservoir

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Developing Situation and Trend Analysis of combined Well Pattern of Horizontal Well in Low Permeability Reservoir:Case in yushulin Horizontal Wells in the development Block

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 328-331页

作者： ZHANG Meiling LI Chuanjiang YOU Jiayu Northeast Petroleum University Daqing Heilongjiang 163318 yushulin oilfield development company Daqing Heilongjiang 163000

1 Introduction Now, the key of oil-field＇s increase production is the development technology for extra-low permeability reservoirs whose porosity is less than 5% and permeability less than 5 mD. The technologies of h... 详细信息

关键词： OIL wells OIL fields SEDIMENTATION & deposition PETROLEUM production HORIZONTAL wells CHINA

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Evolution features of in-situ permeability of low-maturity shale with the increasing temperature,Cretaceous Nenjiang Formation,northern Songliao Basin,NE China

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Petroleum Exploration and development 2022年第3期49卷 516-529页

作者： HE Wenyuan MENG Qi'an LIN Tiefeng WANG Rui LIU Xin MA Shengming LI Xin YANG Fan SUN Guoxin daqing oilfield co.ltd. PetroChinaDaqing 163712China Exploration and development Research Institute of daqing oilfield co.ltd. Daqing 163712China Heilongjiang Provincial Key Laboratory of Shale Oil&Tight Oil Accumulation Daqing 163712China

Temperature-triaxial pressure permeability testing at the axial pressure of 8 MPa and confining pressure of 10 MPa,closed shale system pyrolysis experiment by electrical heating and scanning electron microscopy analysis are used to study the evolution mechanism of in-situ permeability in the direction parallel to bedding of low-maturity shale from Member 2(K_(2)n_(2))of Cretaceous Nenjiang Formation in northern Songliao Basin with mainly Type I kerogen under the effect of *** the increasing temperature,the in-situ permeability presents a peak-valley-peak *** lowest value of in-situ permeability occurs at 375℃.Under the same temperature,the in-situ permeability decreases with the increase of pore *** in-situ permeability evolution of low-maturity shale can be divided into 5 stages:(1)From 25℃to 300℃,thermal cracking and dehydration of clay minerals improve the ***,the value of permeability is less than 0.01×10^(-3)μm^(2).(2)From 300℃to 350℃,organic matter pyrolysis and hydrocarbon expulsion result in mineral intergranular pores and micron pore-fractures,these pores and fractures form an interconnected pore network at limited scale,improving the *** the liquid hydrocarbon,with high content of viscous asphaltene,is more difficult to move under stress and more likely to retain in pores,causing slow rise of the permeability.(3)From 350℃to 375℃,pores are formed by organic matter pyrolysis,but the adsorption swelling of liquid hydrocarbon and additional expansion thermal stress constrained by surrounding stress compress the pore-fracture space,making liquid hydrocarbon difficult to expel and permeability reduce rapidly.(4)From 375℃to 450℃,the interconnected pore network between different mineral particles after organic matter conversion,enlarged pores and transformation of clay minerals promote the permeability to increase constantly even under stress constraints.(5)From 450℃to 500℃,the stable pore system and cro

关键词： Songliao Basin Cretaceous Nenjiang Formation low-maturity shale in-situ conversion pore-fracture structure in-situ permeability shale oil

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Analysis of sensitivity to hydrate blockage risk in natural gas gathering pipeline

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Petroleum Science 2024年第4期21卷 2723-2733页

作者： Ao-Yang Zhang Meng Cai Na Wei Hai-Tao Li Chao Zhang Jun Pei Xin-Wei Wang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Research Institute of Production Engineering Daqing Oilfield Co.Ltd.Daqing163453HeilongjiangChina

During the operational process of natural gas gathering and transmission pipelines,the formation of hydrates is highly probable,leading to uncontrolled movement and aggregation of *** continuous migration and accumulation of hydrates further contribute to the obstruction of natural gas pipelines,resulting in production reduction,shutdowns,and pressure ***,a cascade of risks is prone to *** address this issue,this study focuses on the operational process of natural gas gathering and transmission pipelines,where a comprehensive framework is *** framework includes theoretical models for pipeline temperature distribution,pipeline pressure distribution,multiphase flow within the pipeline,hydrate blockage,and numerical solution *** analyzing the influence of inlet temperature,inlet pressure,and terminal pressure on hydrate formation within the pipeline,the sensitivity patterns of hydrate blockage risks are *** research indicates that reducing inlet pressure and terminal pressure could lead to a decreased maximum hydrate formation rate,potentially mitigating pipeline blockage during natural gas ***,an increase in inlet temperature and terminal pressure,and a decrease in inlet pressure,results in a displacement of the most probable location for hydrate blockage towards the terminal ***,it is crucial to note that operating under low-pressure conditions significantly elevates energy consumption within the gathering system,contradicting the operational goal of energy efficiency and reduction of energy ***,for high-pressure gathering pipelines,measures such as raising the inlet temperature or employing inhibitors,electrical heat tracing,and thermal insulation should be adopted to prevent hydrate formation during natural gas ***,considering abnormal conditions such as gas well production and pipeline network shutdowns,which could potentially tr

关键词： Natural gas hydrates Gathering pipeline Temperature variation Hydrate formation rate Sensitivity analysis

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Distribution and genesis of the anomalously high porosity zones in the middle-shallow horizons of the northern Songliao Basin

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Petroleum Science 2010年第3期7卷 302-310页

作者： Meng Yuanlin Liang Hongwei Meng Fanjin Wu Heyong Wang Cheng Xiu Hongwen Zhang Anda Li Yaguang Guo Rixin School of Earth Science Northeast Petroleum University Daqing 163318 China Exploration and development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China No. 1 Petroleum Production Subcompany Daqing Oilfield Company Ltd. Daqing 163113 China

High-quality reservoirs occur in the middle-shallow horizons of the northern Songliao Basin. The distribution and genesis of their anomalously high porosity zones were studied using measured porosities, examination of ordinary thin sections and blue epoxy resin-impregnated thin sections and by SEM. The results show that there are three anomalously high porosity zones at the depth of 450-900 m, 1,300-1,900 m, 2,050-2,350 m respectively, named zone i, zone ii and zone iii from top to bottom. Horizontally, zone i and zone ii are distributed all over the basin except in the Southeastern Uplift, while zone iii is only distributed in the Central Depression. Zone i was formed by meteoric water leaching as well as organic acid dissolution. Zones ii and iii were dominantly formed by organic acid dissolution. Additionally, clay mineral transformation generating H＋ and hydrocarbon emplacement retarding the cementation of sandstones are also important for the formation of zones ii and iii.

关键词： Anomalously high porosity zone diagenetic fluid organic acid diagenesis secondaryporosity hydrocarbon emplacement sedimentary facies Songliao Basin

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Calculating the formation period of fault lateral sealing and its application

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Energy Geoscience 2022年第1期3卷 17-22页

作者： Fu Guang Fan Zili Fu Hongjun Zhang Yutianyi Qiao Hongliang School of Earth Sciences of Northeast Petroleum University HeilongjiangDaqing163318China Exploration and development Research Institute of daqing oilfield co. Ltd.HeilongjiangDaqing163712China TMSG company Daqing Oilfield Co.Ltd.HeilongjiangDaqing163712China Northeast Petroleum University HeilongjiangDaqing163318China

The study aims to find out the formation period of fault traps near faults in petroliferous basins,based on an analysis of the formation period of fault lateral sealing and related influential factors.A method to calculate the formation period of fault lateral sealing(*** time when displacement pressure of fault rock is equal to that of reservoir rock in fault wall with hydrocarbon migration)is established by comparing the relationship between displacement pressure and time for fault rock and reservoir *** method is then applied to the study on reservoirs in the 1^(st),2^(nd),and 3^(rd) members of Dongying Formation(E_(3)d^(1),E_(3)d^(2) and E_(3)d^(3))in terms of formation period of lateral sealing of F3 fault crossing the three reservoirs in the No.5 structure of Nanpu Sag in Bohai Bay *** results indicate that the formation period of the lateral sealing in the studied reservoirs can date from 7.1 Ma,7.4 Ma and 9.2 Ma respectively,all prior to the hydrocarbon accumulation period(about 2.58 Ma).Hence,it can be concluded that these reservoirs are favorable for the accumulation and preservation of hydrocarbons generated from the underlying source rock E_(3)s^(3),and the method proposed is feasible in calculating the formation period of fault lateral sealing.

关键词： Fault Lateral sealing Formation period Depth of compaction and diagenesis

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controlling factors for oil production in continental shales:A case study of Cretaceous Qingshankou Formation in Songliao Basin

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Petroleum Research 2023年第2期8卷 183-191页

作者： Bo Zhou Yuxiang Xiao Zhengdong Lei Rui Wang Shuiqing Hu Xiulin Hou PetroChina Research Institute of Petroleum Exploration&development Beijing100083China Exploration and development Research Institute of daqing oilfield co. Ltd.Daqing163712China

continental shale oil is widely distributed in the Cretaceous Qingshankou Formation of the Songliao Basin in Northeast *** the Qijia-Gulong sag and the Changling sag in the Songliao Basin,breakthroughs of shale oil exploration and development have been made in the first and second members of the Qingshankou Formation,and several wells represented byWell GYYP1 have achieved high and stable shale oil ***,some horizontal wells in shale oil development pilot test(Well groups A and D)were characterized by low shale oil production,high flowback rate and rapid production ***,controlling factors of the shale oil production were *** results show that shale oil enrichment area and optimal sweet spots are fundamental for high shale oil production,improving horizontal length and drilling ratio of sweet spots is a technical guarantee for enhancing shale oil production of single well,and artificial fracture network(***,complexity,and coupling with preexisting geological bodies)created by fracturing is a direct factor for controlling the shale oil *** subsequent exploration and development of the shale oil,the heterogeneity of sweet spot distribution should be carefully considered,the shale oil enrichment areas and optimal sweet spots also need be optimized,and the wellbore trajectory control and fine geological modeling techniques should be figured ***,the fracturing techniques suitable for the shale with high clay mineral content and weak brittleness should be developed,and the personalized and differentiated staged fracturing also needs to be performed,to effectively enhance single-well shale oil production and estimated ultimate recovery.

关键词： continental shale Shale oil production Heterogeneity Drilling ratio of sweet spot Fracture network Qingshankou formation Songliao Basin

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SYMMETRIC VORTICAL STRUCTURE AND ITS TOPOLOGICAL STABILITY

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Journal of Hydrodynamics 2005年第5期17卷 552-557页

作者： WANG Gang LIANG Xin-gang GANG Ming-li Department of Engineering Mechanics Tsinghua University Beijing 100084 China Exploration and development Research Institute PetroChina Daqing Oilfield Company Ltd. Daqing 163712 China

Using time dependent compressible laminar Navier-Stokes equations with a finite volume method incorporating a third-order-accurate discretization scheme, the flow structures around a slender at certain incidences are numerical simulated and typical crossflow patterns are presented. At incidence 10°, these vortical configurations are different at dissimilar axial locations though they are symmetric. At 35°, the symmetric vortical structures still maintain over the slender, yet their interaction at afterbody is intense than that at the forehody since the two vortices have fully developed downstream. The unstable topological structure of trajectory of saddle-to-saddle points and multiple limit cycle are further discussed in topological stability theory. These structures easily produce bifurcation with perturbation. The results support the view of hydrodynamic instability of vortices flow field.

关键词： symmetric vortices slender body flow pattern topological stability flow mechanism

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