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Petroleum 2023年第1期9卷 124-134页

作者： Junpeng Wang Hongyan Wang Ronghu Zhang Li Dong Ke Wang Zhiyuan Zhang China University of Petroleum BeijingChina PetroChina Hangzhou research institute of Geology ZhejiangChina research institute of Petroleum Exploration&Development CNPCBeijingChina Petroleum Exploration and Production research institute SINOPECBeijingChina

The Keshen gas field is one of the most important natural gas supply sources in the Tarim basin,western *** main gas producing interval there is the Lower Cretaceous Bashijiqike Formation(K1bs),it is an ultra-deep tight reservoir whose buried depth exceeds 6000 m,and it shows a low matrix porosity(<10%)and extremely low matrix permeability(<0.1mD).However,this reservoir can supply extremely high and stable gas production due to improvement of reservoir quality by tectonism and *** on tectonic evolution analysis by plenty of lab data of core plugs or thin sections,the enhancement models of tectonism and fluid are built,evidence suggests both tectonism and fluid improve the reservoir quality *** evolution produces lots of natural fractures in 3stages which promote the ultra-deep tight reservoir permeability 10–200 times,then,testing results of new boreholes without fracturing show reservoir permeability underground can reach 20 ***,fluid dissolution increases reservoir porosity 1–2 times,the main dissolved mineral is feldspar,all fluid dissolution came from the unconformity controlling the dissolution *** and fluid interact on each other:Tectonism controls fracture distribution and types of diagenic fluid in reservoir,but fluids influence fracture cements and *** tectonic folding and the fluid flow control the sweet point reservoir located in upper 150 m formation.

关键词： Reservoir quality Fluid interaction Tectonism Diagenesis Deep gas

Study of CO_(2)Flooding to Improve Development Effect in Conglomerate Reservoirs

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Energy Engineering 2022年第4期119卷 1681-1695页

作者： Haihai Dong Yaguang Qu Ming Liu Lei Zhang Jiakun Wu research institute of Exploration and Development Petrochina Xinjiang Oilfield CompanyKaramay834000China School of Petroleum Engineering Yangtze UniversityWuhan430100China Ministry of Education Key Laboratory of Oil&Gas Resources and Exploration Technology Wuhan430100China Xinjiang Oilfield Company of cnpc Karamay834000China Karamay drilling Company of cnpcWest drilling Corporation Karamay834000China

For low permeability sandstone reservoirs,CO_(2)flooding has been proved to be an effective method to enhance oil *** A is a typical conglomerate reservoir in Xinjiang *** reservoir has strong water sensitivity,and the injection pressure continues to *** the oil well pressure continues to *** to the screening conditions of CO_(2)flooding,the reservoir A can easily achieve CO_(2)miscible flooding with moderate *** the reservoir has the advantage of being close to the gas ***,the relationship curve between CO_(2)oil displacement efficiency and oil displacement pressure was obtained by changing the oil displacement pressure using the fine-tube experimental model,and the minimum miscible pressure of CO_(2)oil displacement was *** minimum miscible pressure of reservoir A was 24.1 *** change of oil phase state after CO_(2)injection was further studied by CO_(2)gas expansion *** results show that the saturation pressure of formation oil increases significantly after CO_(2)injection,and the more CO_(2)injection,the higher the saturation pressure of formation *** the CO_(2)content in the injected crude oil is 55.29 mol%,the saturation pressure of the CO_(2)formation crude oil system reaches 31.60 ***,in order to better simulate the real reservoir conditions of conglomerate reservoir,the 2D visualization model of the outcrop was processed to analyze the microscopic oil displacement mechanism of CO_(2).The experimental results show that the remaining oil after water flooding mainly exists in the form of cluster,film,column and blind end,and the remaining oil after gas flooding exists in the form of island,cluster and film,and there is an obvious gravity overlay ***_(2)flooding after water flooding significantly improved sweep efficiency and enhanced ***,through the analysis of CO_(2)field injection effect in reservoir A,it is shown that CO_(2)absorp

关键词： CO_(2)flooding physical simulation miscible pressure enhanced oil recovery

Two stages of subsidence and its formation mechanisms in Mid-Late Triassic Ordos Basin,NW China

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Petroleum Exploration and Development 2024年第3期51卷 576-588页

作者： DENG Xiuqin CHU Meijuan WANG Long CHEN Xiu WANG Yanxin National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields Xi’an 710018China Exploration division of PetroChina Changqing Oilfield Company Xi’an 710018China Exploration&Development research institute of PetroChina Changqing Oilfield Company Xi’an 710018China

Based on a large number of newly added deep well data in recent years,the subsidence of the Ordos Basin in the Mid-Late Triassic is systematically studied,and it is proposed that the Ordos Basin experienced two important subsidence events during this depositional *** contrastive analysis of the two stages of tectonic subsidence,including stratigraphic characteristics,lithology combination,location of catchment area and sedimentary evolution,it is proposed that both of them are responses to the Indosinian Qinling tectonic activity on the edge of the craton *** early subsidence occurred in the Chang 10 Member was featured by high amplitude,large debris supply and fast deposition rate,with coarse debris filling and rapid subsidence accompanied by rapid accumulation,resulting in strata thickness increasing from northeast to southwest in *** subsidence center was located in Huanxian–Zhenyuan–Qingyang–Zhengning areas of southwestern basin with the strata thickness of 800–1300 *** subsidence center deviating from the depocenter developed multiple catchment areas,until then,unified lake basin has not been formed *** the combined action of subsidence and Carnian heavy rainfall event during the deposition period of Chang 7 Member,a large deep-water depression was formed with slow deposition rate,and the subsidence center coincided with the depocenter basically in the Mahuangshan–Huachi–Huangling *** deep-water sediments were 120–320 m thick in the subsidence center,characterized by fine *** are differences in the mechanism between the two stages of *** early one was the response to the northward subduction of the MianLüe Ocean and intense depression under compression in Qinling during *** later subsidence is controlled by the weak extensional tectonic environment of the post-collision stage during Late Triassic.

关键词： Ordos Basin Chang 10 Member Chang 7 Member subsidence center depocenter subsidence mechanism Qinling orogenic belt Indosinian movement

Genetic mechanism and development of the unsteady Sarvak play of the Azadegan oil field,southwest of Iran

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Petroleum Science 2016年第1期13卷 34-51页

作者： Yang Du Jie Chen Yi Cui Jun Xin Juan Wang Yi-Zhen Li Xiao Fu School of Geoscience and Technology Southwest Petroleum University Geology and Exploration research institute CNPC Chuanqing Drilling Engineering Company Limited Iraq Branch Company of CNODC CNPC

The upper Cretaceous Sarvak reservoir in the Azadegan oil field of southwest Iran has its oil–water contact nearly horizontal from the north to the center and dips steeply from the center to the *** purpose of this paper is to interpret this abnormal reservoir feature by examining the accumulation elements,characteristics,and evolution based on the 3D seismic,coring,and well logging ***,in the field,the Sarvak reservoir is massive and vertically heterogeneous,and impermeable interlayers are *** distribution of petrophysical properties is mainly dominated by the depositional paleogeomorphology and degrades from north to south *** source is the lower Cretaceous Kazhdumi Formation of the eastern Dezful sag,and the seal is the muddy dense limestone of the Cenozoic Gurpi and Pebdeh *** with the trap evolution,the accumulation evolution can be summarized as follows： the Sarvak play became a paleo-anticlinal trap in the Alpine tectonic activity after the late Cretaceous（96 Ma） and then was relatively peaceful in the later long geologic *** Kazhdumi Formation entered in the oil window at the early Miocene（12–10 Ma） and charged the Sarvak bed,thus forming the *** by the ZagrosOrogeny,the paleo-reservoir trap experienced a strong secondary deformation in the late Pliocene（4 Ma）,which shows as the paleo-trap shrank dramatically and the prelow southern area uplifted and formed a new secondary anticline trap,hence evolving to the current two structural highs with the south point（secondary trap） higher than the north（paleo-trap）.The trap deformation broke the paleoreservoir kinetic equilibrium and caused the secondary reservoir *** upper seal prevented vertical oil dissipation,and thus,the migration is mainly in interior Sarvak bed from northern paleo-reservoir to the southern secondary *** strong reservoir heterogeneity and the degradation trend of reservoir properties along migration pat

关键词： reservoir southwest Cretaceous migration geologic tectonic unsteady limestone depositional sandstone

Using High-Precision Remote Information for Auxiliary Design of Geophone Point

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石油地球物理勘探 2009年第1期44卷 1-8页

作者： Zhang You-yan Lei Ying-chun Ye Yong Hu Yan Luo Lun-cai research institute of Petroleum Exploration&Development CNPC Beijing 100083 China Geophysical Prospecting Company CNPC Chuanqing Drilling Engineering Company Limited Chengdu Sichuan Province610213 China

利用高精度遥感数据(分辨率已达亚米级)提取相关信息评价检波器组合、选择有利检波器埋置位置,既可在观测系统设计阶段用于评估采集设计方案能否实施及辅助选择适当检波器组合图形,也可在外业测量前逐点优选检波器组合中心点,从而达到... 详细信息

利用高精度遥感数据(分辨率已达亚米级)提取相关信息评价检波器组合、选择有利检波器埋置位置,既可在观测系统设计阶段用于评估采集设计方案能否实施及辅助选择适当检波器组合图形,也可在外业测量前逐点优选检波器组合中心点,从而达到改善接收条件、提高观测系统的可实施性及保证地震资料采集质量的目的.利用高精度遥感数据提取相关信忠评价影响检波器接收信号质量的因素,所对应的遥感信忠主要用于三个方面的评估:①利用DEM(数字高程模型)与坡度计算检波器组合图形内的平整度与展开能力(组合展开度);②利用检波器组合区域的组内高差、坡度、湿度、地表松散度评价耦合条件的优劣程度(组合优度);③利用综合高精度正射影像与DEM提取的相关信忠划定工区内需要避让的地段及不符合HSE规范的施工禁区(可实施性).实例分析表明,通过遥感影像选择检波器组合与检波器埋置中心,提高了检波器组合内埋置点的平整度与组合展开度,对减轻野外劳动强度,提高劳动生产率,节约成本都起到了重要作用.

关键词：地震检波器远程数据高精度辅助设计信息点检波器组合扩大生产能力相关信息

Experimental study on the controlling factors of frictional coefficient for lost circulation control and formation damage prevention in deep fractured tight reservoir

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Petroleum 2022年第3期8卷 352-362页

作者： Chengyuan Xu Honglin Zhang Mingming Zhu Yili Kang Xiaopeng Yan Jingyi Zhang Yingrui Bai State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina School of Petroleum Engineering China University of Petroleum(East China)QingdaoChina Changqing drilling Branch CNPC Chuanqing Drilling Engineering Co.Ltd.Xi'an 710000China

Working fluids loss is a major contributor to low productivity during production process of fractured tight *** circulation control effect directly related to the tribological behavior between fracture surface and lost circulation materials(LCMs).In this study,the friction coefficient(FC)was investigated using typical clastic rocks and LCMs by considering multiple effect factors divided into external condition and internal *** results show that normal load had a relatively high effect on sliding model.A positive correlation was observed between FC and asperities *** decreased induced by particle size degradation of rigid *** LCMs manifested higher FC compared with rigid *** the lubrication condition by working fluid,FC of rigid LCMs was mainly controlled by their surface *** of organic LCMs is more sensitive to high temperature aging than inorganic *** plugging experiments show that LCMs optimized based on the research results can effectively improve the efficiency and strength of fracture plugging.

关键词： Fractured tight reservoirs Lost circulation control Friction coefficient Lost circulation materials

Dynamic subsidence prediction of ground surface above salt cavern gas storage considering the creep of rock salt

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Science China(Technological Sciences) 2010年第12期53卷 3197-3202页

作者： WANG TongTao1, YAN XiangZhen1, YANG XiuJuan1 & YANG HengLin2 1 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China 2 cnpc drilling research institute, Beijing 100097, China College of Pipeline and Civil Engineering China University of Petroleum Qingdao China cnpc drilling research institute Beijing China

A new model is proposed to predict the dynamic subsidence of ground surface above salt cavern gas storage during the leaching and storage, which takes into account the creep of rock salt. In the model, the extended form of Gaussian curve is adopted to figure out the shape of subsidence areas. The corresponding theoretical formulas are derived. In addition, parameters are studied to investigate the surface subsidence as a function of the salt ejection rate, internal pressure, buried depth, diameter, height, running time, etc. Through an example, the subsidence of the salt cavern gas storage located at Jiangsu of China obtained by the new model was compared with those by Peter A F formula, Schober & Sroka formula and FLAC3D through simulation. The results showed the proposed model is precise and correct, and can meet the actual engineering demands. The surface subsidence is equidirectional with the increase of salt ejection rate, depth, diameter, height, and running time, but reverse to the increase of internal pressure. The depth, diameter, running time and internal pressure have great effects on the subsidence, whereas the salt ejection rate and height have little influences on it.

关键词： salt cavern gas storage dynamic subsidence creep of rock salt extended form of Gaussian curve calculation model

Numerical Simulation of Two-Phase Flow in Glutenite Reservoirs for Optimized Deployment in Horizontal Wells

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Fluid Dynamics & Materials Processing 2023年第1期19卷 245-259页

作者： Yuhui Zhou Shichang Ju Qijun Lyu Hongfei Chen Xuebiao Du Aiping Zheng Wenshun Chen Ning Li School of Petroleum Engineering Yangtze UniversityWuhan430100China Key Laboratory of drilling and Production Engineering for Oil and Gas Wuhan430100China Western research institute Yangtze UniversityKaramay834000China Heavy Oil Company Xinjiang Oilfield Company of CNPCKaramay834000China

It is known that the pore media characteristics of glutenite reservoirs are different from those of conventional sandstone *** reservoir permeability and naturally developed microfractures make water injection in this kind of reservoir very *** this study,new exploitation methods are *** a real glutenite reservoir as a basis,a three-dimensional fine geological model is ***,combining the model with reservoir performance information,and through a historical fitting analysis,the saturation abundance distribution of remaining oil in the reservoir is *** is shown that,using this information,predictions can be made about whether the considered reservoir is suitable for horizontal well fracturing or *** direction,well length,well spacing and productivity of horizontal well are also obtained.

关键词： Glutenite reservoir horizontal well reservoir numerical simulation residual oil optimal deployment

Effect of mechanical vibration process parameters on the cement plugs properties for abandoned wells

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Petroleum Science 2023年第4期20卷 2428-2441页

作者： Hang-Ming Liu Yang-Ye He Ji-Fang Wan Lin Chen Xian-Zhong Yi Yuan-Hua Zhou Yu-Xian He Xiang-Gui Ming Lu Ren Cooperative Innovation Center of Unconventional Oil and Gas Yangtze University(Ministry of Education&Hubei Province)WuhanHubei430100China School of Mechanical Engineering Yangtze UniversityJingzhouHubei434023China cnpc Engineering Technology R&D Company Limited Beijing102206China College of Safety and Ocean Engineering China University of Petroleum-BeijingBeijing102249China Engineering Technology research institute CNPC Bohai Drilling Engineering Co.Ltd.Tianjin300457China

A high-quality plug of the abandoned wellbore is considered an essential technical aspect of the oil and gas well abandonment technology system. This paper presents a method of active mechanical excitation to enhance the quality of wellbore plug barriers. An indoor simulation platform is developed, and the effects of different combinations of vibration frequency, amplitude and duration on the properties of the wellbore plug cement material are investigated. It is observed that the optimal combination of excitation parameters occurs at a vibration frequency of 15 Hz, a vibration time of 6 min, and a vibration amplitude of 3 mm. Compared with the condition without the vibration process, the cementing strength, compressive strength, and tensile strength of wellbore cement plug with the optimal mechanical vibration process could increase by 51%, 38% and 20%, respectively, while the porosity decreases by 5%. As determined by scanning electron microscopy of the set cement's microstructure, mechanical vibration effectively eliminates internal porosity and improves the set cement's density. The optimal excitation parameters obtained from the test can guide the design of the vibration plugging tool. The designed vibration plugging tool is simulated in the near field. The cement plug cementation quality tester tests the vibrating and non-vibrating samples, and the cementation ratio is calculated. The test results show that the average cementation ratio of vibrating samples is 0.89375, and that of non-vibrating samples is 0.70625, and the cementation quality is improved by 27%. It is concluded that it not only provides essential data for the design of mechanical vibration plug apparatus, on-site vibration plugs, and the development of operational specifications for vibration plugs, but also provides solid engineering guidance.

关键词： Plugging and abandonment Cement plug Vibration Mechanical properties Microstructure

A Model for the Determination of Semi-Circular Spot Corrosion Damage and Residual Strength in Oil Pipes

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1709-1720页

作者： Hongtao Liu Maoxian Xiong Bo Zhang Junfeng Xie Jinrui Deng MifengZhao Ruijing Jiang Yushan Zheng research institute of Oil and Gas Engineering Tarim Oilfield Company PetroChinaKorla841000China cnpc research institute of Safety and Environment Technology Beijing102206China

Pitting corrosion often occurs due to the presence of various corrosive substances,such as CO_(2) and H_(2)S,in the pipe service *** a result of this process,the residual strength of oil pipes is reduced and this can compromise the integrity of the entire pipe *** the present work,a model is introduced on the basis of the API579 standard to determine the so-called stress concentration *** model accounts for pitting corrosion shapes such as shallow semi-circles,semi-circles,and deep *** relationship between the corrosion pit depth and opening diameter and the residual strength of the oil casing is *** results show that the influence of the pit opening diameter on the stress concentration coefficient is smaller than that of the pit *** a constant pit opening diameter,the coefficient increases gradually with increasing the pit *** compressive strength and internal pressure strength of the carbon steel oil casing decrease *** the depth of the corrosion pit is relatively small,the growth of the coefficient is slower;when the depth of the corrosion pit increases to a certain value,the increase in stress concentration coefficient becomes obvious.

关键词： Pitting corrosion residual strength stress concentration coefficient