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A Novel Parameter-Optimized Recurrent Attention Network for Pipeline Leakage Detection

IEEE/CAA Journal of Automatica Sinica 2023年第4期10卷 1064-1076页

作者： Tong Sun Chuang Wang Hongli Dong Yina Zhou Chuang Guan the authors are with the sanya offshore oil&gas research institute Northeast Petroleum UniversitySanya 572024 Artificial Intelligence Energy research institute Northeast Petroleum University Heilongjiang Provincial Key Laboratory of Networking and Intelligent Control Northeast Petroleum UniversityDaqing 163318China

Accurate detection of pipeline leakage is essential to maintain the safety of pipeline ***,deep learning(DL)has emerged as a promising tool for pipeline leakage detection(PLD).However,most existing DL methods have difficulty in achieving good performance in identifying leakage types due to the complex time dynamics of pipeline *** the other hand,the initial parameter selection in the detection model is generally random,which may lead to unstable recognition *** this reason,a hybrid DL framework referred to as parameter-optimized recurrent attention network(PRAN)is presented in this paper to improve the accuracy of ***,a parameter-optimized long short-term memory(LSTM)network is introduced to extract effective and robust features,which exploits a particle swarm optimization(PSO)algorithm with cross-entropy fitness function to search for globally optimal *** this framework,the learning representation capability of the model is improved and the convergence rate is ***,an anomaly-attention mechanism(AM)is proposed to discover class discriminative information by weighting the hidden states,which contributes to amplifying the normalabnormal distinguishable discrepancy,further improving the accuracy of *** that,the proposed PRAN not only implements the adaptive optimization of network parameters,but also enlarges the contribution of normal-abnormal discrepancy,thereby overcoming the drawbacks of instability and poor ***,the experimental results demonstrate the effectiveness and superiority of the proposed PRAN for PLD.

关键词： attention mechanism(AM) long shortterm memory(LSTM) parameter-optimized recurrent attention network(PRAN) particle swarm optimization(PSO) pipeline leakage detection(PLD)

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A real-time intelligent lithology identification method based on a dynamic felling strategy weighted random forest algorithm

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Petroleum Science 2024年第2期21卷 1135-1148页

作者： Tie Yan Rui Xu Shi-Hui Sun Zhao-Kai Hou Jin-Yu Feng School of Petroleum Engineering Northeast Petroleum UniversityDaqing163318HeilongjiangChina sanya offshore oil&gas research institute Northeast Petroleum UniversitySanya572025HainanChina

Real-time intelligent lithology identification while drilling is vital to realizing downhole closed-loop drilling. The complex and changeable geological environment in the drilling makes lithology identification face many challenges. This paper studies the problems of difficult feature information extraction,low precision of thin-layer identification and limited applicability of the model in intelligent lithologic identification. The author tries to improve the comprehensive performance of the lithology identification model from three aspects: data feature extraction, class balance, and model design. A new real-time intelligent lithology identification model of dynamic felling strategy weighted random forest algorithm(DFW-RF) is proposed. According to the feature selection results, gamma ray and 2 MHz phase resistivity are the logging while drilling(LWD) parameters that significantly influence lithology identification. The comprehensive performance of the DFW-RF lithology identification model has been verified in the application of 3 wells in different areas. By comparing the prediction results of five typical lithology identification algorithms, the DFW-RF model has a higher lithology identification accuracy rate and F1 score. This model improves the identification accuracy of thin-layer lithology and is effective and feasible in different geological environments. The DFW-RF model plays a truly efficient role in the realtime intelligent identification of lithologic information in closed-loop drilling and has greater applicability, which is worthy of being widely used in logging interpretation.

关键词： Intelligent drilling Closed-loop drilling Lithology identification Random forest algorithm Feature extraction

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Encoding-Decoding-Based Recursive Filtering for Fractional-Order Systems

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IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 1103-1106页

作者： Bo Jiang Hongli Dong Yuxuan Shen Shujuan Mu Artificial Intelligence Energy research institute Northeast Petroleum UniversityDaqing 163318 Heilongjiang Provincial Key Laboratory of Networking and Intelligent Control Northeast Petroleum UniversityDaqing 163318 sanya offshore oil&gas research Institue Sanya 572025China IEEE

Dear editor,This letter focuses on the encoding-decoding-based recursive filtering problem for a class of fractional-order *** the purpose of protecting security of the wireless communication network,a dynamic-quantization-based encoding-decoding mechanism is introduced to encrypt the transmitted ***,the measurement outputs are first encoded by the encoder into codewords which are then transmitted over the wireless communication *** received by the decoder,the codewords are decoded and then sent to the *** light of the mathematical properties of truncated Gaussian distribution,the variance of the encoding-decoding-induced error between the decoded measurement and the real measurement is *** upper bound on the filtering error covariance is first obtained based on the variance of the encoding-decoding-induced ***,the minimal upper bound is derived by choosing proper filter ***,the efficiency and superiority of the proposed algorithm are verified through a simulation example.

关键词： decoder filtering error

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Quantitative evaluation of adsorbed and free water in deep shales:a case study on the Wufeng-Longmaxi Formations from the Luzhou area,southern Sichuan Basin,China

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Frontiers of Earth Science 2024年第2期18卷 336-346页

作者： Shengxian ZHAO Yongyang LIU Shuangfang LU Shuaihu LIU Wenbiao LI Zhiyan ZHOU Yashuo WANG Zhaojing SONG Key Laboratory of Deep oil and gas China University of Petroleum(East China)Qingdao 266580China School of Geosciences China University of Petroleum(East China)Qingdao 266580China Shale gas research institute of PetroChina Southwest oil&gasfield Company Chengdu 610051China sanya offshore oil&gas research institute Northeast Petroleum UniversitySanya 572025China

Deep shale gas reservoirs commonly contain connate water, which affects the enrichment and migration of shale gas and has attracted the attention of many scholars. It is significant to quantitatively estimate the amounts of adsorbed and free water in shale matrix pores, considering the different impacts of pore water (adsorbed water and free water) on shale gas. In this paper, pore water in six deep shale samples from the Wufeng-Longmaxi Formations in the Luzhou area, southern Sichuan Basin, China, was quantitatively evaluated by saturation-centrifugation experiments. Further, the impact of shale material composition and microstructure on the pore water occurrence was analyzed. The results show that amounts of adsorbed and free water are respectively 1.7967–9.8218 mg/g (mean 6.4501 mg/g) and 9.5511–19.802 mg/g (mean 13.9541 mg/g) under the experimental conditions (30℃, distilled water). The ratio of adsorbed water to total water is 15.83%–42.61% (mean 30.45%). The amounts of adsorbed and free water are related to the pore microstructure and material compositions of shale. The specific surface area of shale controls the amount of adsorbed water, and the pore volume controls the amount of free water;organic pores developed in shale solid asphalt contribute specific surface area and pore volume, and inorganic pores developed in clay mineral contribute pore volume. Therefore, the pores of shale solid asphalt accumulate the adsorbed water and free water, and the pores of clay minerals mainly accumulate the free water.

关键词： deep shales pore water adsorbed amount free amount

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Economic feasibility and efficiency enhancement approaches for in situ upgrading of low-maturity organic-rich shale from an energy consumption ratio perspective

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地学前缘 2023年第1期30卷 281-295页

作者： LU Shuangfang WANG Jun LI Wenbiao CAO Yixin CHEN Fangwen LI Jijun XUE Haitao WANG Min sanya offshore oil&gas research institute Northeast Petroleum UniversitySanya 572025China Ministry of Education Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Northeast Petroleum UniversityDaqing 163318China Key Laboratory of Deep oil and gas School of GeosciencesChina University of Petroleum(East China)Qingdao 266580China

The technical feasibility of in situ upgrading technology to develop the enormous oil and gas resource potential in low-maturity shale is widely ***,because of the large quantities of energy required to heat shale,its economic feasibility is still a matter of debate and has yet to be convincingly demonstrated *** on the energy conservation law,the energy acquisition of oil and gas generation and the energy consumption of organic matter cracking,shale heat-absorption,and surrounding rock heat dissipation during in situ heating were evaluated in this *** energy consumption ratios for different conditions were determined,and the factors that influence them were *** results show that the energy consumption ratio increases rapidly with increasing total organic carbon(TOC)*** oil-prone shales,the TOC content corresponding to an energy consumption ratio of 3 is approximately 4.2%.This indicates that shale with a high TOC content can be expected to reduce the project cost through large-scale operation,making the energy consumption ratio after consideration of the project cost greater than *** situ heating and upgrading technology can achieve economic *** main methods for improving the economic feasibility by analyzing factors that influence the energy consumption ratio include the following:(1)exploring technologies that efficiently heat shale but reduce the heat dissipation of surrounding rocks,(2)exploring technologies for efficient transformation of organic matter into oil and gas,i.e.,exploring technologies with catalytic effects,or the capability to reduce in situ heating time,and(3)establishing a horizontal well deployment technology that comprehensively considers the energy consumption ratio,time cost,and engineering cost.

关键词： shale gas content in situ upgrading energy consumption ratio high-efficiency heating efficient organic matter transformation

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Protocol-Based Non-Fragile State Estimation for Delayed Recurrent Neural Networks Subject to Replay Attacks

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 249-251页

作者： Fan Yang Hongli Dong Yuxuan Shen Xuerong Li Dongyan Dai the Artificial Intelligence Energy research institute Northeast Petroleum UniversityDaqing 163318 the Heilongjiang Provincial Key Laboratory of Networking and Intelligent Control Northeast Petroleum UniversityDaqing 163318 the sanya offshore oil&gas research institute Sanya 572025China IEEE

Dear Editor, This letter focuses on the protocol-based non-fragile state estimation problem for a class of recurrent neural networks(RNNs). With the development of communication technology, the networked systems have ... 详细信息

关键词： network communication estimation

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Quantitative characterization of shale pore connectivity and controlling factors using spontaneous imbibition combined with nuclear magnetic resonance T_(2)and T_(1)-T_(2)

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Petroleum Science 2023年第4期20卷 1947-1960页

作者： Peng-Fei Zhang Shuang-Fang Lu Jun-Qian Li Xiang-Chun Chang Jun-Jian Zhang Yu-Mao Pang Zi-Zhi Lin Guo Chen Ya-Jie Yin Yu-Qi Liu College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao266590ShandongChina sanya offshore oil&gas research institute Northeast Petroleum UniversitySanyaHainan572025China Key Laboratory of Deep oil and gas China University of Petroleum(East China)Qingdao266580ShandongChina College of Resources and Environment Yangtze UniversityWuhan430100HubeiChina

Shale oil can be extracted from shale by using interconnected pore *** migration of hydrocarbon molecules within the shale is controlled by pore ***,assessing the pore connectivity of shale oil reservoirs is *** characterize pore connectivity and clarify its controlling factors,this study used spontaneous imbibition(SI)combined with nuclear magnetic resonance(NMR)T_(2)and T_(1)-T_(2)technologies on shale oil reservoirs selected from the Shahejie Formation in the Dongying Sag,Bohai Bay *** to the findings,the SI processes of shales include fast-rising,slow-rising,and stable *** fast-rising stage denotes pore *** shales studied have poor connectivity,with lower imbibition slopes and connected porosity ratios,but large effective *** the SI process,micropores have the highest imbibition saturation,followed by mesopores and ***,n-dodecane ingested into micropores appears primarily as adsorbed,whereas n-dodecane appears primarily as free states in mesopores and macropores during the SI *** pore connectivity of the shales under study is primarily controlled by inorganic *** and feldspar develop large and regular pores,resulting in better pore connectivity,whereas clay minerals and calcite with plenty of complex intragranular pores do *** matter negatively influences pore connectivity because the dissolution of calcite by organic acid produced during hydrocarbon generation leads to a more complex and heterogeneous pore *** study sheds light on the pore connectivity and controlling factors of the shale oil reservoir and aids in the understanding of shale oil mobility.

关键词： Pore connectivity Spontaneous imbibition Nuclear magnetic resonance Mercury intrusion capillary pressure Shale oil reservoir

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Quantitatively unmixing method for complex mixed oil based on its fractions carbon isotopes: A case from the Tarim Basin, NW China

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Petroleum Science 2023年第1期20卷 102-113页

作者： Tao-Hua He Wen-Hao Li Shuang-Fang Lu Er-Qiang Yang Tao-Tao Jing Jun-Feng Ying Peng-Fei Zhu Xiu-Zhe Wang Wen-Qing Pan Bao-Shou Zhang Zhong-Hong Chen Key Laboratory of oil and gas Resources and Exploration Technology Yangtze UniversityWuhanHubei 430100China School of Geosciences China University of Petroleum(East China)QingdaoShandong266580China sanya offshore oil&gas research institute Northeast Petroleum UniversitySanyaHainan 572025China Petroleum Exploration&Production research institute Tarim Oilfield CompanyPetroChinaKorlaXinjiang841000China Key Laboratory of Deep oil and gas China University of Petroleum(East China)QingdaoShandong266580China

Deep mixed oils with secondary alterations have been widely discovered in the Tarim Basin,but current methods based on biomarkers and isotopes to de-convolute mixed oil cannot calculate the exact mixing proportion of different end-member oils,which has seriously hindered further exploration of deep hydrocarbons in the study *** solve this problem,we constructed a novel method based on the carbon isotope(δ13C)of the group components to de-convolute mixed liquid hydrocarbons under the material balance *** results showed that the mixed oil in the Tazhong Uplift was dominantly contributed at an average proportion of 68% by an oil end-member with heavier d13C that was believed to be generated from the Cambrian-Lower Ordovician source rocks,whereas the mixed oil in the Tabei Uplift was predominantly contributed at an average proportion of 61% by an oil end-member with lighter d13C that was believed to be generated from the Middle-Upper Ordovician source *** indicates that,on the basis of the detailed description of the distribution of effective source rocks,the proposed method will be helpful in realizing differential exploration and further improving the efficiency of deep liquid hydrocarbon exploration in the Tarim *** addition,compared to traditional δ13C methods for whole oil and individual n-alkanes in de-convoluted mixed oil,the proposed method has a wider range of applications,including for mixed oils with variations in color and density,indicating potential for promoting the exploration of deep complex mixed oils in the Tarim Basin and even around the world.

关键词： Mixed crude oil Carbon isotopes End-member oil De-convolution Secondary alteration Tarim Basin

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Distribution and isotopic signature of 2-alkyl-1,3,4-trimethylbenzenes in the Lower Paleozoic source rocks and oils of Tarim Basin:Implications for the oil-source correlation

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Petroleum Science 2022年第6期19卷 2572-2582页

作者： Tao-Hua He Wen-Hao Li Shuang-Fang Lu Er-Qiang Yang Tao-Tao Jing Jun-Feng Ying Peng-Fei Zhu Xiu-Zhe Wang Wen-Qing Pan Zhong-Hong Chen Key Laboratory of oil and gas Resources and Exploration Technology Yangtze UniversityWuhanHubei430100China School of Geosciences China University of Petroleum(East China)QingdaoShandong266580China Key Laboratory of Deep oil and gas China University of Petroleum(East China)QingdaoShandong266580China sanya offshore oil&gas research institute Northeast Petroleum UniversitySanyaHainan 572025China Petroleum Exploration&Production research institute Tarim Oilfield CompanyPetro ChinaKorlaXinjiang841000China

Series of 2-alkyl-1,3,4-trimethylbenzenes(ATMBs)were detected in most of crude oils and source rocks collected from various strata and locations of the Tarim *** appeared to have heavy carbon isotopic signatures(δ13C,up to~-16‰)compared to those hydrocarbons from oxygenic phototrophic organisms,indicating that the unequivocal source of green sulfur bacteria(GSB)and photic zone euxinia(PZE)existed in the original *** the high paleoproductivity,the PZE may have enhanced the preservation of organic matter,which triggered the formation of extremely organic-rich source rocks with TOC up to 29.8%for the Lower Cambrian Yuertus Formation(€1y).The coexistence of ATMBs and the diagnostic products from secondary alterations(e.g.,abundant 25-norhopanes,thiadiamondoids,and diamondoids)indicated a stronger ability of *** with the results of quantitatively de-convoluting mixed oil,the oil-source correlation based on ATMBs from a large number of Lower Paleozoic samples of the Tarim Basin suggested that the abundant deep crude oil resources co ntained a dominant contribution(>50%)from the€1y source ***,the ATMBs,as diagnostic biomarkers indicating unequivocal precursors under special habitat conditions,might provide important insights for the exploration of deep Lower Paleozoic crude oils in the Tarim Basin.

关键词： 2-alkyl-1,3,4-trimethylbenzenes Carbon isotopes Deep lower paleozoic crude oils Thiadiamondoid oil-source correlation Tarim Basin

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Influence of supercritical CO_(2)on the physical property of tight sandstone

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Petroleum 2024年第3期10卷 520-526页

作者： Huan Peng Jian Yang Junliang Peng Huifen Han Xinghao Gou Yucheng Jia Yibo Li Valeriy Kadet Engineering Technology research institute of Southwest oil&gas Field Company PetroChinaChengdu610017China Key Laboratory of oil&gas Well Stimulation Technology of Southwest oil&gas Field Company Chengdu610017China State Key Laboratory of oil&gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Gubkin Russia State University of oil and gas Moscow119991Russia

In low-pressure gas reservoirs,water-based fracture fluid is difficult to flowback,which is unfavorable for several tight sandstone gas reservoirs in the Sichuan Basin with low pressure and high permeability geological *** CO_(2)possesses a number of remarkable physical and chemical features,including a density near to water,a viscosity close to gas,and high *** CO_(2)fracturing is a new type of non-aqueous fracturing method that is favorable to fracturing flowback in low-pressure tight sandstone and has a wide range of *** discuss on whether supercritical CO_(2)fracturing with low pressure tight sandstone is *** sandstone cores from the Jinqiu gas field in the Sichuan Basin were used to study the influence of supercritical CO_(2)on the physical properties of sandstone *** CO_(2)was used to interact with tight sandstone samples,and then the changes in porosity,permeability,and rock microstructure of tight sandstone were observed under various time,pressure,and temperature *** the interaction between tight sandstone and supercritical CO_(2),new dissolution pores will appear,or the original pores will be increased,and the width of some natural fractures will also be increased,and the porosity will increase by 1.09%-8.85%,and the permeability will increase by 2.34%-21.26%,quantifying the influence of supercritical CO_(2)on physical properties of tight sandstone,and further improving the interaction mechanism between supercritical CO_(2)and tight *** study improves in the understanding of the tight sandstone-supercritical CO_(2)interaction mechanism,as well as providing an experimental foundation and technological guarantee for field testing and use of supercritical CO_(2)in low-pressure tight sandstone gas reservoirs.

关键词： Supercritical CO_(2) Low pressure tight sandstone Porosity Permeability Microstructure

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