Chinese Petroleum and Natural Gas Research最新文献

Research on Seismic Velocity Inversion Method Based on Deep Learning 基于深度学习的地震速度反演方法研究

Chinese Petroleum and Natural Gas Research Pub Date : 2023-06-28 DOI: 10.48014/cpngr.20230425002

XU Wang, Wang Feiyi, Zhiqiang Zhang, Gongli Liu, Duan Xinyi

{"title":"Research on Seismic Velocity Inversion Method Based on Deep Learning","authors":"XU Wang, Wang Feiyi, Zhiqiang Zhang, Gongli Liu, Duan Xinyi","doi":"10.48014/cpngr.20230425002","DOIUrl":"https://doi.org/10.48014/cpngr.20230425002","url":null,"abstract":"Methods for obtaining seismic velocity include offset velocity analysis, tomography velocity inversion and full waveform. inversion, but these methods all share common problems: As the amount of seismic data increases, the time required to process the data to obtain the seismic velocity increases exponentially, and the latter two methods are more dependent on the initial seismic velocity. To address the problems of the above methods, this paper improves a seismic velocity inversion method based on deep learning. At the same time, a method that can generate a large number of velocity models randomly with geological features (undulation layer, faults, anomalies, etc. ) similar to those of real subsurface structures is also proposed. The generated velocity model and fluctuation equation for forward modeling are used to perform. the forward modeling, which allows for the efficient establishment of data set. The basic principle of the improved deep learning inversion method in this paper is as follows: the characteristic information of the training data is extracted by convolution neural network, which is trained with large data to obtain a nonlinear mapping relationship between seismic record and seismic velocity. In the inversion stage, the seismic velocity can be inversed quickly by inputting the seismic records into the trained network. In order to make the network give full play to the advantages of processing seismic data, the authors obtained the dominant network structure by means of numerical simulation, and achieved satisfactory inversion results. Finally, through comparative experiments, this paper verifies the advantages and applicability of the method.","PeriodicalId":133056,"journal":{"name":"Chinese Petroleum and Natural Gas Research","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116075490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PNNPlus Saturation Logging Technology And Its Application PNNPlus饱和测井技术及其应用

Chinese Petroleum and Natural Gas Research Pub Date : 2022-12-28 DOI: 10.48014/cpngr.20220821001

Chao Zhou, Binglin Li, Chunyu Chen, Y. Huang, Shenghao Yi

{"title":"PNNPlus Saturation Logging Technology And Its Application","authors":"Chao Zhou, Binglin Li, Chunyu Chen, Y. Huang, Shenghao Yi","doi":"10.48014/cpngr.20220821001","DOIUrl":"https://doi.org/10.48014/cpngr.20220821001","url":null,"abstract":"As oilfield enters middle and late stages of exploitation, the dynamic monitoring of oil saturation has become an essential part for grasping the distribution of remaining oil and improving the crude oil recovery. PNNPlus is a new saturation logging technology that adds two activated gamma probes on the basis of thermal neutron lifetime logging using neutron probes to assist in determining the water content of the reservoir, but its adaptability for residual oil saturation monitoring in low-porosity and low-permeability formation is unclear. Therefore, this paper researches and analyzes the adaptability of PNNPlus saturation logging technology by taking the Longdong Oilfield in the Ordos Basin as the research object. It is shown that: the PNNPlus logging technology is suitable for evaluating the remaining oil saturation of the mediumlow porosity reservoir in the Longdong Oilfield as the PNNPlus logging results are consistent with the oil saturation of completed wells and the interpretation conclusions can accurately evaluate the remaining oil saturation; The water saturation of the formation calculated by the oxygen content in the formation as detected by PNNPlus logging tool and the macro-capture cross-section Sigma, combined with the oil saturation, completion logging data, and geological data, can accurately identify and divide water-flooded layers; The formation porosity obtained from PNNPlus logging deviates from that obtained from completion logging by 0. 5%, but matches well with the oil saturation of the oil layer and water layer obtained from completion logging.","PeriodicalId":133056,"journal":{"name":"Chinese Petroleum and Natural Gas Research","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115574162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fracture Pressure Calculation Method in Transversely Isotropic Formation by Logging 横向各向同性地层测井裂缝压力计算方法

Chinese Petroleum and Natural Gas Research Pub Date : 2022-09-28 DOI: 10.48014/cpngr.20220801001

Junchuan Gui, Hongquan Xia, Yu Sang, B. Zeng, Jian Wu, Yi Song, Haoyong Huang, Ersi Xu

{"title":"Fracture Pressure Calculation Method in Transversely Isotropic Formation by Logging","authors":"Junchuan Gui, Hongquan Xia, Yu Sang, B. Zeng, Jian Wu, Yi Song, Haoyong Huang, Ersi Xu","doi":"10.48014/cpngr.20220801001","DOIUrl":"https://doi.org/10.48014/cpngr.20220801001","url":null,"abstract":"Fracture pressure is one of the key parameters in drilling engineering,completion engineering and hydraulic fracturing technology.Using logging data to calculate continuous formation fracture pressure is the most commonly used method,but the effect of formation anisotropy is usually ignored by the conventional method.To this end,the formation is considered as the transversely isotropic medium,and the Young􀆳s modulus and Poisson􀆳s ratio in the vertical and horizontal directions are obtained by calculating the elastic stiffness matrix.By considering the relationship between vertical stress and horizontal strain,a novel formula is derived to calculate the formation fracture pressure based on the relationship between depth and strain.Finally,this novel formation fracture pressure formula is optimally programmed and applied to the calculation of the formation fracture pressure in Block L.The comparison between the field measurement results of formation fracture pressure and the logging prediction results shows that the measured formation fracture pressure of hydraulic fracturing at 4,266m in Well L1 is 90.5MPa,while the fracture pressure calculated by the traditional method is 93.5MPa (with a relative error of 5.4% compared with the measured results),and the fracture pressure calculated by the transversely isotropic method is 95.4MPa (with a relative error of 3.3% compared with the measured results).The accuracy of the formation fracture pressure calculated by the new method is better than that of the formation fracture pressure calculated by the traditional method,which is applicable and comparable.","PeriodicalId":133056,"journal":{"name":"Chinese Petroleum and Natural Gas Research","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127081439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fracturing Effect Evaluation Technology and Application based on Distributive Tracer 基于分布式示踪剂的压裂效果评价技术及应用

Chinese Petroleum and Natural Gas Research Pub Date : 2022-09-28 DOI: 10.48014/cpngr.20220824001

Chao Zhou

{"title":"Fracturing Effect Evaluation Technology and Application based on Distributive Tracer","authors":"Chao Zhou","doi":"10.48014/cpngr.20220824001","DOIUrl":"https://doi.org/10.48014/cpngr.20220824001","url":null,"abstract":"In order to address the difficulty of testing the segmented and layered fracturing productivity in the process of oilfield development,the basic principle of monitoring and evaluating the fracturing effects based on distribution tracer and the supporting process technology are researched,and different types of distribution tracers are injected during the fracturing process.According to the parameters such as the output of tracers,flowback liquid production,and contribution rate,the oil-water production profile and fracture information are determined,thus the segmented (layered) fracturing effect of oil and gas wells are analyzed and judged.Finally,this technology is applied to monitor and evaluate the fracturing effect of Jian* well in Changqing Oilfield.The research results show that the 54 tracer production concentration curves of 27 fracturing sections in Jian*Well can be divided into four categories:parabolic single sharp peak curve, parabolic single broad peak curve,parabolic multi-peak curve,and peakless curve.By monitoring distributive tracer,intuitive results of horizontal well’s segmented productivity contribution can be obtained.This technology can be used for dynamic monitoring of formation water,fracturing fluid,and crude oil production during segmented fracturing in horizontal wells and layered fracturing in vertical wells,conducive to accurately evaluating the effectiveness of fracturing,optimizing fracturing schemes and determining interwell connectivity.","PeriodicalId":133056,"journal":{"name":"Chinese Petroleum and Natural Gas Research","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121555697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of W/O Drilling Fluid in Horizontal Well with Long Horizontal Sections in Oil Shale Formations W/O钻井液在油页岩长段水平井中的应用

Chinese Petroleum and Natural Gas Research Pub Date : 2022-06-28 DOI: 10.48014/cpngr.20220307001

Z. Qian

{"title":"Application of W/O Drilling Fluid in Horizontal Well with Long Horizontal Sections in Oil Shale Formations","authors":"Z. Qian","doi":"10.48014/cpngr.20220307001","DOIUrl":"https://doi.org/10.48014/cpngr.20220307001","url":null,"abstract":"To address the challenges of oil shale formation well wall instability,micro and nano pore blocking, long horizontal section well friction and borehole purification.We have analysed the nature of formation lithology,matrix pore size and specific surface by using linear expansion method,rolling recovery method and nuclear magnetic resonance method,and developed a white W/O drilling fluid system with an oil-to-water ratio of 70:30 by developing emulsifiers,tackifying and shear strength-improving agents,plugging agents and preferably filter loss agents,and wetting agents.The system was evaluated by using the breakthrough pressure test triaxial compression test and relaxation measurement method in the laboratory. The evaluation results showed that the system could not only maintain the strength of the rock sample but also improve the plasticity of the rock sample after the drilling fluid soaked with the breakthrough pressure of 6.5MPa,and it had good suspension capacity after the relaxation value reached 60s.The field test results show that the system has stable rheological properties and solves the problems of well wall instability and borehole purification,with the well diameter expansion rate of only 3.8% and the mechanical drilling speed of up to 10.85m/h.The SY-1 well has set a record for the longest horizontal section of 1800m in the Liaohe River oil area.","PeriodicalId":133056,"journal":{"name":"Chinese Petroleum and Natural Gas Research","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125545906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and Testing of High Temperature Resistant Composite Salt Drilling Fluid System 耐高温复合盐钻井液体系的研制与试验

Chinese Petroleum and Natural Gas Research Pub Date : 2022-06-28 DOI: 10.48014/cpngr.20220428001

Z. Qian

{"title":"Development and Testing of High Temperature Resistant Composite Salt Drilling Fluid System","authors":"Z. Qian","doi":"10.48014/cpngr.20220428001","DOIUrl":"https://doi.org/10.48014/cpngr.20220428001","url":null,"abstract":"In response to the difficult problem that the lithology of the target formation of Well RT1 is prone to hydrate and expand,the bottom hole temperature is high,and bicarbonate pollution is prone to occur, by analyzing the formation characteristics and technical difficulties of drilling fluids,and preferentially selecting key treatment agents such as organic salts,filtrate reducers and blocking agents,the formulation of high temperature resistant organic salt drilling fluid is developed.The results of laboratory experiments show that the drilling fluid system is resistant to temperatures up to 180℃,the difference in density between the upper and lower parts is only 0.06g/cm3 after hot rolling for 8 days,the HTHP filtration loss is less than 4 ml,the 16-hour expansion rate is only 0.88%,the secondary rolling recovery rate reaches 92%, the core blocking rate is more than 75%,and the resistance to bicarbonate contamination is more than 22000mg/L.It has good rheological properties,filtration properties,inhibition performance,plugging performance, anti-bicarbonate pollution performance and sedimentation stability performance.The results of the field experiment show that the good diameter expansion rate of the lower part of the two-open lower and the three-open lower is only 3.8%,the drilling fluid still has good rheological properties at 170℃,and the performance varies slightly when the bicarbonate ion concentration in the drilling fluid is 30230mg/L. It indicates that the developed high temperature resistant organic salt drilling fluid has effectively solved the difficult problems of easy hydration,expansion and dispersion of the mudstone in the target layer of well RT1,high temperature at the bottom of the well and bicarbonate contamination,and has broad application prospects in high-temperature deep wells.","PeriodicalId":133056,"journal":{"name":"Chinese Petroleum and Natural Gas Research","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124326997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1