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Minimizing the filtration loss of water-based drilling fluid with sustainable basil seed powder

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Petroleum 2022年第1期8卷 39-52页

作者： Hanyi Zhong Xin Gao Xianbin Zhang Anliang Chen Zhengsong Qiu Xiangzheng Kong Weian Huang Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China) Ministry of EducationQingdao266580China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China Drilling Fluid Technology Services of CNPC bohai Drilling Engineering company Limited Tianjin300280China

Filtration control is important to ensure safe and high efficient *** aim of the current research is to explore the feasibility of using basil seed powders(BSPs)to reduce filtration loss in water-based drilling *** effect of BSP concentration,thermal aging temperature,inorganic salts(NaCl and CaCl_(2))on the filtration properties of bentonite/basil suspensions was *** filtration control mechanism of BSP was probed via water absorbency test,zeta potential measurement,particle size distribution measurement,and filter cake morphologies observation by scanning electron *** incorporation of BSPs into the bentonite suspension generated acceptable rheology below 1.0 w/v%.The BSPs exhibited effective filtration control after thermal aging at 120C,but less efficiency at 150*** thermal aging at 120℃,the bentonite suspension containing 1.0 w/v%BSPs could resist NaCl and CaCl_(2) pollution of 5.0 w/v%and 0.3 w/v%*** general filtration control behaviors,the exceptional water retaining capability formed by numerous nanoscale 3D networks in the basil seed gum and considerable insoluble small particles in BSPs might further contribute to the filtration *** excellent filtration properties bring basil seed a suitable and green candidate for the establishment of high-performance drilling fluids.

关键词： Bentonite suspension Basil seed Filtration Interaction Water-based drilling fluid

Stabilized Crouzeix-Raviart element for the coupled Stokes and Darcy problem

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Applied Mathematics and Mechanics(English Edition) 2010年第3期31卷 393-404页

作者：冯民富祁瑞生朱瑞鞠炳焘 Department of Mathematics Sichuan University Department of Information Technology CNOOC Energy Technology and Services Limited Beijing Branch Company

This paper introduces a new stabilized finite element method for the coupled Stokes and Darcy problem based on the nonconforming Crouzeix-Raviart element. Optimal error estimates for the fluid velocity and pressure ar... 详细信息

关键词： Beavers-Joseph-Saffman condition mass conservation balance of force,coupled Stokes and Darcy problem

Sealing integrity evaluation and optimization of cement sheath-formation interface under different formation conditions during fracturing

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Journal of Earth Science 2023年

作者： Donghua Su Sheng Huang Zaoyuan Li Jin Li Ziyu Wang Shizhong Tang Hua Wu Bo Zhao Foreign Cooperation Projects Department PetroChina Dagang Oilfield company Petroleum Engineering School State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Oil Production Technology Institute PetroChina Dagang Oilfield company International Engineering company CNPC bohai Drilling Engineering Co. Ltd.

Fluid channeling caused by seal failure at the cement sheath-formation interface during fracturing is a severe problem in oil gas wells. In this study， a novel model was developed to evaluate interface sealing integrity. The model’s accuracy was verified based on a self-developed interface seal evaluation device and an experiment. Subsequently， the interface seal under different formation conditions was investigated using this model. The theoretical calculation showed that for a cement sheath–carbonate formation interface， the channeling of acid-fracturing fluid caused interface seal failure and sustained casing pressure in the annulus space between the technical casing and formation. Mutual channeling between the fracturing sections occurred at the cement sheath–shale formation interface during fracturing. For a sandstone formation， the interface seal failure caused the channeling between a water-bearing formation and a sandstone formation. Aiming at different formation conditions， the mechanical properties requirements of Young’s modulus and Poisson’s ratio of cement sheath were proposed respectively to ensure its seal integrity. The proposed model and method can be used to evaluate and optimize sealing integrity during fracturing.

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Evaluation of natural gas hydrate resources in the South China Sea by combining volumetric and trend-analysis methods

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Petroleum Science 2022年第1期19卷 37-47页

作者： Xing-Wen Zhang Tao Hu Xiong-Qi Pang Yao Hu Tong Wang En-Ze Wang Zhi Xu Xiao-Han Liu Zhuo-Ya Wu Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China cnooc International Limited Beijing 100029China School of Earth&Space Sciences Peking UniversityBeijing 100871China Research Institute of Petroleum Exploration and Development PetroChina Company LimitedBeijing 100083China

Natural gas hydrate(NGH),considered as a type of premium energy alternative to conventional hydrocarbons,has been broadly *** estimate of the total NGH resources in the world has decreased by more than 90%since the first evaluation in *** and geophysical conditions of the South China Sea(SCS)are favorable for the formation of NGH,which has been proved by drilling results up to *** recoverability of the NGH in the SCS has been confirmed by the production tests using both vertical and horizontal *** 2001,35 estimates of NGH resources in the SCS have been made,with relatively stable results varying between 600 and 900×109 ton oil *** these estimations,the volumetric method was commonly adopted,but the geological conditions,the migration-accumulation mechanisms of NGH,and the practical recoverability were not *** estimates cannot be regarded as evaluated resources according to the international resource evaluation standards,but are at most about prospective gas content of NGH,thus inefficient for guiding explorations and *** solve these problems,this study divides the past NGH surveys in the SCS into seven stages,acquires key geological parameters of every stage based on previous studies and analogy with other areas,evaluates the NGH resources of these seven stages by using the volumetric method,then adopts a new trend-analysis method to simulate the downward trend of these estimates,and finally predicts the NGH resources in the SCS at 2025 and *** downward trend is because of the continuous improvement of NGH understanding over time,which is consistent with the trend of global NGH *** the present stage(from 2019 to 2021),the average technically recoverable resource(ATRR)is 7.0×10^(12)m^(3),and the estimates of 2025 and 2030 ATRR are 6.46×10^(12)m^(3) and 4.01×10^(12)m^(3)respectively,with a difference of less than 40%.Therefore,it can be inferred that the ATRR of NGH in the SCS is between

关键词： Resource evaluation Natural gas hydrates The South China Sea Volumetric method Trend-analysis method

Control of hydrocarbon accumulation by Lower Paleozoic cap rocks in the Tazhong Low Rise, Central Uplift, Tarim Basin, West China

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Petroleum Science 2014年第1期11卷 67-80页

作者： Zhang Yanping Lü Xiuxiang Yang Haijun Han Jianfa Lan Xiaodong Zhao Yue Zhang Jinhui College of Geosciences China University of Petroleum State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Tarim Oilfield company PetroChina cnooc Tianjin Branch company

Despite the absence of regional cap rocks in the Lower Paleozoic for the entire Tazhong Low Rise,several sets of effective local cap rocks are well preserved on the Northern *** these the best is the Ordovician mudstone of the Sangtamu Formation; the second is the Silurian Red Mudstone Member of the Tatairtag Formation and the marl of the Ordovician Lianglitag Formation; and the third is the gray mudstone of the Silurian Kepingtag *** dense limestone of the Ordovician Yingshan Formation and the gypsum of the Middle Cambrian have shown initial sealing *** effective cap rocks are closely related to the distribution of Lower Palaeozoic hydrocarbons in the Tazhong Low *** well-preserved Sangtamu Formation mudstone and its location close to migration pathways,rich Lower Paleozoic hydrocarbon accumulation can be found on the Northem ***,most of the reserves are distributed below the Sangtamu Formation mudstone; areally,hydrocarbons are mainly found in the areas with well-developed Sangtamu Formation mudstone and Lianglitag Formation *** history and hydrocarbon charging history show that the evolution of Lower Palaeozoic cap rocks controlled the accumulation of hydrocarbon in the Tazhong Low *** the Red Mudstone Member of the Tatairtag Formation and Sangtamu Formation mudstone for examples：1） In the hydrocarbon charging time of the Late Caledonian-Early Hercynian,with top surfaces at burial depths of over 1,100 m,the cap rocks were able to seal oil and gas; 2） During the intense uplifting of the Devonian,the cap rocks with top surfaces at burial depths of 200-800 m and 500-1,100 m respectively were denuded in local areas,thus hydrocarbons trapped in earlier time were degraded to widespread bitumen; 3） In the hydrocarbon charging time of the Late Hercynian and Himalayan,the top surfaces of the cap rocks were at burial depths of over 2,000 m without intense uplifting and denudation thereafter,so trapped hydrocarbons

关键词： Cap rock hydrocarbon accumulation hydrocarbon destruction Lower Paleozoic Tazhong Low Rise

Effect of modification degrees on the interfacial properties and EOR efficiency of amphiphilic Janus graphene oxide

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Petroleum Science 2023年第2期20卷 1217-1224页

作者： Han Jia Xin Wei Qiu-Xia Wang Yuan-Bo Wang Shi-Jie Wen Fang-Ning Fan Qiang Wang Zhe Wang De-Xin Liu Pan Huang Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdaoShandong 266580China Shandong Key Laboratory of Oilfield Chemistry School of Petroleum EngineeringChina University of Petroleum(East China)QingdaoShandong 266580China bohai Oilfield Research Institute Tianjin BranchCNOOC China LimitedTianjin 300459China Department of Chemical and Materials Engineering University of AlbertaEdmonton AB T6G 1H9Canada

Asymmetrically modified Janus graphene oxide(JGO)has attracted great attention due to its unique physical chemistry properties and wide *** modification degree of Janus nanosheets inevitably affects their interfacial activity,which is essential for their performances in enhanced oil recovery(EOR).In this study,the interfacial properties of Janus graphene oxide(JGO)with various modification degrees at liquid-liquid and liquid-solid interfaces were systematically evaluated via the measurements of interfacial tension(IFT),dilatational modulus,contact angle,and EOR efficiency was further assessed by core flooding *** is found that JGO-5 with higher modification degree exhibits the greater ability to reduce IFT(15.16 mN/m)and dilatational modulus(26 mN/m).Furthermore,JGO can construct interfacial and climbing film with the assistance of hydrodynamic power to effectively detach the oil from the rock surface and greatly enhance oil *** modified JGO-2 can highly improve recovery of residual crude oil(11.53%),which is regarded as the promising EOR agent in practical *** present study firstly focuses on the effects of modification degrees on the JGO interfacial properties and proposes diverse EOR mechanisms for JGO with different modification degrees.

关键词： Graphene oxide Modification degrees Janus nanosheets Interfacial film EOR

A Model for the Connectivity of Horizontal Wells in Water-Flooding Oil Reservoirs

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1441-1468页

作者： Chenyang Shi Fankun Meng Hongyou Zhang HuiJiang Chang Xun Zhong Jie Gong and Fengling Li Cooperative Innovation Center of Unconventional Oil and Gas(Ministry of Education&Hubei Province) Yangtze UniversityWuhan430100China School of Petroleum Engineering Yangtze UniversityWuhan430100China Key Laboratory of Drilling and Production Engineering for Oil and Gas Wuhan430100China Tianjin Branch of cnooc Ltd.Tianjin300459China Oilfield Technology Service company Xinjiang Oilfield CompanyPetroChinaKaramay834000China

As current calculation models for inter-well connectivity in oilfields can only account for vertical wells,an updated model is elaborated here that can predict the future production performance and evaluate the connectivity of horizontal wells(or horizontal and vertical wells).In this model,the injection-production system of the considered reservoir is simplified and represented with many connected ***,the horizontal well is modeled with multiple connected wells without considering the pressure loss in the horizontal *** this approach,the production performance for both injection and production wells can be obtained by calculating the bottom-hole flowing pressure and oil/water saturation according to the material balance equation and a saturation front-tracking *** effort is also provided to optimize(to fit known historical production performances)the two characteristic problem parameters,namely,the interwell conductivity and connected volume by means of a SPSA gradient-free *** order to verify the validity of the model,considering a heterogenous reservoir,three conceptual examples are constructed,where the number ratio between injection and production wells are 1/4,4/1 and 4/5,*** is shown that there is a high consistency between simulation results and field data.

关键词： Connectivity model horizontal well production performance interwell connectivity connected volume

Structures of the bohai Petroliferous Area,bohai Bay Basin

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 641-650页

作者： CAI Dongsheng LUO Yuhui YAO Changhua HE Jiankun HU Shengbiao LU Huafu WANG Liangshu Research Institute of the bohai Corporation of cnooc Tianjin 300452 Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100019 Department of Earth Sciences Nanjing UniversityNanjing 210008Jiangsu

This paper, for the first time, deals with a more systematic study of the structures in the bohai petroliferous area that covers nearly one third of the bohai Bay basin. The study mainly involves the effects of preexisting basement faults on the basin formation, the characteristics of basin geometry and kinetics, the modelling of the tectonic-thermal history, the polycyclicity and heterogeneity in the structural evolution and the natural seismic tomographic images of the crust and upper mantle. The authors analyze the features of the dynamic evolution of the basin in the paper and point out that the basin in the bohai petroliferous area is an extensional pull-apart basin.

关键词： basin structure rifting cycle thermal history seismic tomographic image crust and upper mantle architecture bohai Bay basin

The contribution of bacteria to organic matter in coal-measure source rocks

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Acta Geochimica 2019年第3期38卷 364-375页

作者： Qingsong Cheng Min Zhang Guanghui Huang Wenjun Zhang College of Resources and Environment Yangtze University Key Laboratory of Exploration Technology for Oil & Gas Research (Yangtze University) Ministry of Education bohai Petroleum Research Institute CNOOC (China) Co.Ltd.Tianjin Branch

On the basis of GC–MS analysis, a suite of nine coal-measure source rocks(Ro 0.51%–0.63%) from the southern margin of Junggar basin was found to contain many biomarkers for bacterially-generated hydrocarbons:hopane, sesquiterpene, C_(23)+ monomethyl alkanes(even carbon predominance), and C_(24)+ alkyl ***–eval and microscope analysis indicate that vitrinite(especially desmocollinite and homocollinite) plays a significant role in the generation of hydrocarbons in coalmeasure source rocks. Vitrinite performs this role by absorbing ultramicroscopic organic matter, generally in the form of resins or bacterial plastids. C_(23)+ monomethyl alkanes(even carbon predominance) and C_(24)+ alkyl cyclohexane series compounds are derived from bacterial metabolites of higher plants. The ultramicro organic matter adsorbed by vitrinite source rocks in the study area is probably ultramicro bacterial plastids. Because the organic matter of higher plants with low hydrogen content has been transformed into organic matter rich in hydrogen by bacteria, the hydrocarbon generation capacity of source rocks is greatly improved. In other words, in coal-measure source rocks, bacteria play an important role in hydrocarbon generation.

关键词： Coal-measure source rocks Organic matter type Bacteria Monomethyl alkanes Alkyl cyclohexane