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The mechanism of hydraulic fracturing assisted oil displacement to enhance oil recovery in low and medium permeability reservoirs

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Petroleum Exploration and Development 2022年第4期49卷 864-873页

作者： LIU Yikun WANG Fengjiao WANG Yumei LI Binhui ZHANG Dong YANG Guang ZHI Jiqiang SUN Shuo WANG Xu DENG Qingjun XU He Laboratory of Enhanced Oil Recovery of Education Ministry Northeast Petroleum UniversityDaqing 163318China Postdoctoral Res ctr Daqing Oilfield Company LimitedDaqing 163453China Downhole Services Company of daqing Oilfield Company Limited Daqing 163453China Exploration and Development Research Institute of daqing Oilfield Company Limited Daqing 163712China The NO.1 Production Plant of daqing Oilfield Company Limited Daqing 163712China

Aiming at the technology of hydraulic fracturing assisted oil displacement which combines hydraulic fracturing,seepage and oil displacement,an experimental system of energy storage and flowback in fracturing assisted oil displacement process has been developed and used to simulate the mechanism of percolation,energy storage,oil displacement and flowback of chemical agents in the whole *** research shows that in hydraulic fracturing assisted oil displacement,the chemical agent could be directly pushed to the deeper area of the low and medium permeability reservoirs,avoiding the viscosity loss and adhesion retention of chemical agents near the pay zone;in addition,this technology could effectively enlarge the swept volume,improve the oil displacement efficiency,replenish formation energy,gather and exploit the scattered residual *** the reservoir with higher permeability,this measure takes effect fast,so to lower cost,and the high pressure hydraulic fracturing assisted oil displacement could be adopted *** the reservoir with lower permeability which is difficult to absorb water,hydraulic fracturing assisted oil displacement with surfactant should be adopted to reduce flow resistance of the reservoir and improve the water absorption capacity and development effect of the *** degree of formation energy deficit was the main factor affecting the effective swept range of chemical ***,the larger the formation energy deficit was,the further the seepage distance of chemical agents was,accordingly,the larger the effective swept volume was,and the greater the increase of oil recovery *** energy enhancement was the most important contribution to enhanced oil recovery(EOR),which was the key to EOR by the technology of hydraulic fracturing assisted oil displacement.

关键词： hydraulic fracturing chemical flooding formation energy enhancement remaining oil distribution oil displacement mechanism enhancing oil recovery

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Representations and Classification of Traveling Wave Solutions to sinh-Grdon Equation

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communications in Theoretical Physics 2008年第1期49卷 153-158页

作者： LIU Cheng-Shi Department of Mathematics Daqing Petroleum Institute Daqing 163318 China

Two concepts named atom solution and combinatory solution are defined. The classification of all single traveling wave atom solutions to sinh-Gordon equation is obtained, and qualitative properties of solutions are discussed. In particular, we point out that some qualitative properties derived intuitively from dynamic system method are not true. Finally, we prove that our solutions to sinh-Gordon equation include all solutions obtained in the paper [Z.T. Fu, et al., commun. Theor. Phys. （Beijing, China） 45 （2006） 55]. Through an example, we show how to give some new identities on Jacobian elliptic functions.

关键词： traveling wave solution atom solution exact solution sinh-GSrdon equation elliptic function

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Three-dimensional geodetic deformation surveying for Naner area in daqing oilfield

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中国有色金属学会会刊：英文版 2005年第S1期15卷 112-115页

作者： LIU Xing-quan~(1, 2), LIU Shao-xuan~2, ZHANG Zhi-wen~3, XU Hai~4, LIU Jian-jun~5 (1. Department of Earth Science, Zhejiang University, Hangzhou 310027, China 2. The Second Oil Recovery Plant of daqing Oilfields Co Ltd, daqing 163414, China 3. daqing Logging and Testing Services Company, daqing 163411, China 4. Longnan Telephone Station of daqing communications Center, daqing 163410, China 5. Department of Civil Engineering, Wuhan Polytechnic University, Wuhan 430023, China) Zhejiang Univ Dept Earth Sci Hangzhou 310027 Peoples R China Second Oil Recovery Plant of daqing Oilfields Co Daqing 163414 Peoples R China daqing commun ctr Longnan Telephone Stn Daqing 163410 Peoples R China daqing Logging & Testing Serv Co Daqing 163411 Peoples R China Wuhan Polytech Univ Dept Civil Engn Wuhan 430023 Peoples R China

Geodetic deformation severely affects the development of the oilfield and probably causes casing damage or abandonment of injection wells and producers. Therefore, it is meaningful to survey and study three-dimensional geodetic deformation in the process of the oilfield development. In order to study this issue, 11-year long term surveying of three-dimensional geodetic deformation has been carried out while developing Naner area in daqing oilfield. Basic rules of 3-D geodetic deformation have been obtained through surveying. Results show that production and injection under high pressure may cause the changes of surface elevation, and geodetic deformation correlates with simultaneous formation pressure. Precautions and relative technological measurements have been put forward in the waterflood development in Naner region and provide theoretical guidelines for the production and casing preservation of the oilfield. Finally, surveying results are interpreted by porous elastic theory. Mathematical model to calculate 3-D geodetic deformation is put forward in the course of the oilfield development.

关键词： daqing oilfield geodetic deformation producer water injector mathematical model

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RELATIONS BETWEEN TWO SETS OF FUNCTIONS DEFINEDBY THE TWO INTERRELATED ONE-SIDE LIPSCHITZCONDITIONS

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Journal of Computational Mathematics 1999年第5期17卷 457-462页

作者： Zhao, SS Wang, CY Zhang, GF Lanzhou Univ Dept Math Lanzhou 730000 Peoples R China Dept commun Commun Ctr Lanzhou 730030 Gansu Province Peoples R China

In the theoretical study of numerical solution of stiff ODEs, it usually assumes that the righthand function f(y) satisfy one-side Lipschitz condition less than or equal to v(1)parallel to y - z parallel to(2),f : Omega subset of or equal to C-m --> C-m, or another related one-side Lipschitz condition [F(Y) - F(Z), Y - Z](D) less than or equal to v'parallel to Y - Z parallel to(D)(2), F : Omega(s) subset of or equal to C-ms --> C-ms, this paper demonstrates that the difference of the two sets of all functions satisfying the above two conditions respectively is at most that v' - v' only is constant independent of stiffness of function f.

关键词： stiff ODEs one-side Lipschitz condition logarithmic norm

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Quantitative studies of hydrocarbon loss of the Silurian bitumen sandstone in the Tarim Basin

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Science China Earth Sciences 2008年第S2期51卷 101-107页

作者： JIANG ZhenXue1,2,PANG XiongQi1,2,LIU LuoFu1,2,WANG XianDong3,ZHANG Jun4 & LI HongYi1,2 1 Basin and Reservoir Research Center,China University of Petroleum,Beijing 102249,China 2 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China 3 Research Institute of Exploration and Development,daqing Oilfield Company Ltd,daqing 163712,China 4 Petroleum Exploration and Production Institute of SINOPEC,Beijing 100083,China China Univ Petr Basin & Reservoir Res Ctr Beijing 102249 Peoples R China China Univ Petr State Key Lab Petr Resource & Prospecting Beijing 102249 Peoples R China daqing Oilfield Co Ltd Res Inst Explorat & Dev Daqing 163712 Peoples R China SINOPEC Petr Explorat & Prod Inst Beijing 100083 Peoples R China

The evolution of Tarim Basin experienced several tectonic movements,of which Caledonian movement caused a serious damage to reservoirs of Silurian. The earlier reservoirs size and the later hydrocarbon loss are two key factors to exploration prospect of Silurian. On the basis of net thickness of bituminous sandstone and recovery coefficient of crude oil converting to bitumen,the scale of the hydrocarbon loss of palaeo-accumulation in bitumen sandstone of Silurian was calculated (86.30×108t). The deter-mination of net thickness of bitumen sandstone was completed mainly by several methods,such as physical property demarcation,observing lithology,grains with oil inclusion (GOI) technology,and quantitative grains fluorescence (QGF) technology. The samples of black sandstone and white sand-stone were collected and compared by means of the methods mentioned above. The results showed that there was little hydrocarbon,or none,in the white sandstone. The recovery coefficient was ob-tained by the analyses of plentiful physical parameters of crude oil and bitumen sandstone,based on the hypothesis that nonhydrocarbon compounds and bitumen were invariable in the process of bitu-men forming. The calculated result,which is more scientific and actual,indicates the exploration pros-pect is more promising in Silurian of the Tarim Basin.

关键词： Tarim Basin Silurian bitumen sandstone hydrocarbon loss quantitative research recovery coefficient

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A common property of R(E,F) and B(R^n,R^m) and a new method for seeking a path to connect two operators

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Science China Mathematics 2010年第10期53卷 2605-2620页

作者： Ma ZhaoFeng Ma JiPu Zhejiang Inst commun Dept Informat & Management Hangzhou 311112 Zhejiang Peoples R China Harbin Normal Univ Tseng Yuan Rong Funct Anal Res Ctr Harbin 150025 Peoples R China

Given two Banach spaces E,F,let B(E,F) be the set of all bounded linear operators from E into F,and R(E,F) the set of all operators in B(E,F) with finite *** is well-known that B(Rn) is a Banach space as well as an algebra,while B(Rn,Rm) for m = n,is a Banach space but not an algebra;meanwhile,it is clear that R(E,F) is neither a Banach space nor an ***,in this paper,it is proved that all of them have a common property in geometry and topology,i.e.,they are all a union of mutual disjoint path-connected and smooth submanifolds (or hypersurfaces).Let Σr be the set of all operators of finite rank r in B(E,F) (or B(Rn,Rm)).In fact,we have that 1) suppose Σr∈ B(Rn,Rm),and then Σr is a smooth and path-connected submanifold of B(Rn,Rm) and dimΣr = (n + m)r-r2,for each r ∈ [0,min{n,m});if m = n,the same conclusion for Σr and its dimension is valid for each r ∈ [0,min{n,m}];2) suppose Σr∈ B(E,F),and dimF = ∞,and then Σr is a smooth and path-connected submanifold of B(E,F) with the tangent space TAΣr = {B ∈ B(E,F) : BN(A)-R(A)} at each A ∈Σr for 0 r < ∞.The routine methods for seeking a path to connect two operators can hardly apply here.A new method and some fundamental theorems are introduced in this paper,which is development of elementary transformation of matrices in B(Rn),and more adapted and simple than the elementary transformation *** addition to tensor analysis and application of Thom’s famous result for transversility,these will benefit the study of infinite geometry.

关键词： operator of finite rank smooth Banach submanifold matrix

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Adaptive filtering algorithm to GPS/INS integrated system

Adaptive filtering algorithm to GPS/INS integrated system

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International Conference on Info-Tech and Info-Net (ICII 2001)

作者： Feng, WJ Yang, SZ Zhao, F Chongqing Univ Inst Commun Chongqing 400044 Peoples R China

ISBN: (纸本)7900081585

GPS/INS integrated systems have applications in the self-positioning of the high dynamic targets. This paper conceives state equations and observation equations by the integrated system and GPS observation, respectively. An adaptive filtering algorithm is introduced which estimates observation noise covariance with observation data, and estimates dynamic noise covariance by use of Sage-Husa filtering algorithm which has faster convergent speed and better stability than the conventional Kalman filtering algorithm At last, simulations are given to verify the effectiveness of the algorithm.

关键词： GPS/INS integrated adaptive filtering Kalman filtering

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Network Fault Analysis from Passive Measurement

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China communications 2012年第5期9卷 64-74页

作者： Huang Lisheng Wang Wenyong Li Changchun Lan Yunhai Univ Elect Sci & Technol China Sch Comp Sci & Engn Chengdu 610054 Peoples R China Chongqing commun Coll Chongqing 400035 Peoples R China Zhongnan ATMB Civil Aviat Commun Network Ctr Guangzhou 510470 Guangdong Peoples R China

A new passive method for automatic dis-covery and bcation of network failure is proposed. This method employs a passive measurement to collect infonmtion and events from network traffic, and em-ploys a rrodel-based reasoning system to detect and locate network faults. Measurement points are de-ployed in a backbone network to capture the traffic and then evaluate the Quality of Service （QoS） metrics of end-to-end IP conversations. A muting rrodel is al-so established for the observed network to simulate the attributes and activities of reuters and links. This muting model also deduces the muting path for each IP conversation, and thus the QoS metrics of IP con-versations are mapped into the metrics of paths. With the inforrmtion of shared links of overlapping paths and network torrography technique, the QoS metrics of links can also be estimated, and the poorly rated links are picked out as failure points. This method is imple-mented in a tool named FaultMan, which is deployed in a campus network. Test results have shown its availa-bility in rriddle-scale networks.

关键词： passive measurement network fault lo-cation model-based reasoning

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6G MOBILE NETWORKS: EMERGING TECHNOLOGIES AND APPLICATIONS

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China communications 2020年第9期17卷 90-91页

作者： Ying-Chang Liang Dusit Niyato Erik G. Larsson Petar Popovski Univ Elect Sci & Technol China Ctr Intelligent Networking & Commun Chengdu Peoples R China Univ Elect Sci & Technol China Articial Intelligence Res Inst Chengdu Peoples R China Univ Sydney Sydney NSW Australia Inst Infocomm Res Singapore Singapore Stanford Univ Stanford CA 94305 USA Nanyang Technol Univ Sch Comp Sci & Engn Singapore Singapore Linkoping Univ LiU Commun Syst Linkoping Sweden KTH Royal Inst Technol Stockholm Sweden George Washington Univ Washington DC 20052 USA Univ Florida Gainesville FL 32611 USA Aalborg Univ Sect Connect Aalborg Denmark

Modern society has been widely benefiting from the advances in wireless *** the past decade,extensive research efforts have been dedicated to develop the fifth-generation(5G)wireless mobile *** resulted in enabling technologies for the three generic connectivity types in 5G(broadband,massive Internet-of-things connectivity and ultra-reliable low latency communication)as well as their coexistence.

关键词： wireless connectivity massive

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Channel Measurements and Models for 6G

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China communications 2022年第11期19卷 I0002-I0004页

作者： Jianhua Zhang Bo Ai Chengxiang Wang Xiang Cheng Mansoor Shafi Wei Fan BUPT China Inst Commun Beijing Peoples R China BUPT CMCC Joint Res ctr Beijing Peoples R China Beijing Jiaotong Univ Beijing Peoples R China State Key Lab Rail Traff Control & Safety Beijing Peoples R China Chinese Inst Elect Beijing Peoples R China Acad Europaea Aalborg Denmark Peking Univ Beijing Peoples R China Victoria Univ Wellington Sch Engn Wellington New Zealand Aalborg Univ Antennas Propagat & Millimeter Wave Syst APMS Sec Aalborg Denmark

In the early stage of 6G research,carrying out research on channel measurements and models is one of the fundamental and prerequisite works,as well as full of the *** by the demand for multiple frequency bands,versatile scenarios,and various new technologies in the future,6G channels are expanding in multiple dimensions such as the space-time-frequency *** all make 6G channel measurement and modeling research face a series of new challenges,e.g.,non-stationarity in multiple dimensions,the obvious increase in modeling complexity,and changes in theoretical premises and *** is therefore clear that more efforts are needed to understand propagation characteristics,especially in the new scenes and applications,and to develop a new paradigm for 6G channel modeling.

关键词： channel dimensions versatile

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