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Natural rubber latex as a potential additive for water-based drilling fluids

Petroleum Science 2024年第4期21卷 2677-2687页

作者： Jun yang Guan-Cheng Jiang Jing-Tian Yi Yin-Bo He li-li yang Teng-Fei Dong Guo-Shuai Wang College of Petroleum Engineering China University of Petroleum (Beijing) National Engineering Research Center of Oil & Gas Drilling and Completion Technology Changqing Drilling General Company CNPC Chuanqing Drilling Engineering Company Limited

The environmental hazards and "carbon footprint" of oil and gas drilling can be significantly reduced by replacing traditional petroleum-based chemical additives with natural materials derived from plants and animals. This paper explored for the first time the interaction mechanism between natural rubber latex(NRL) and bentonite suspensions(BTs) through a series of characterization experiments, as well as the potential applications in water-based drilling fluids(WBDF). The gel viscoelasticity experiments showed that NRL could decrease the consistency coefficient(k) and flow index(n) of BTs, and enhance the shear thinning performance of BTs as pseudo-plastic fluids. In addition, 0.5 w/v% NRL not only increased the critical yield stress and strengthened the structural strength between the bentonite particles, but also facilitated the compatibility of pressure loss and flow efficiency. The evaluation of colloidal stability and WBDF performance indicated that NRL particles could promote the hydration and charge stability on the surface of BTs particles, and optimize the particle size distribution and flow resistance of WBDF under the "intercalation-exfoliation-encapsulation" synergistic interaction. Moreover, NRL can improve the rheological properties of WBDF at high temperatures(ling the pores and cracks of the filter cake, which ultimately reduces the permeability of the cake and the filtration loss of WBDF.

关键词： Natural materials Water-based drilling fluids Natural rubber latex Bentonite suspensions Filtration loss

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Chemical modification of barite for improving the performance of weighting materials for water-based drilling fluids

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Petroleum Science 2024年第1期21卷 551-566页

作者： li-li yang Ze-Yu liu Shi-bo Wang Xian-Bo He Guan-Cheng Jiang Jie Zhang MOE Key Laboratory of Petroleum Engineering State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Changping DistrictBeijing102249China MOE Key CNPC Drilling Research Institute Changping DistrictBeijing102206China

With increasing drilling depth and large dosage of weighting materials,drilling fluids with high solid content are characterized by poor stability,high viscosity,large water loss,and thick mud cake,easier leading to reservoir damage and wellbore *** this paper,micronized barite(MB)was modified(mMB)by grafting with hydrophilic polymer onto the surface through the free radical polymerization to displace conventional API barite *** suspension stability of water-based drilling fluids(WBDFs)weighted with API barite:mMB=2:1 in 600 g was significantly enhanced compared with that with API barite/WBDFs,exhibiting the static sag factor within 0.54 and the whole stability index of *** viscosity and yield point reached the minimum,with a reduction of more than 40%compared with API barite only at the same *** multi-stage filling and dense accumulation of weighting materials and clays,filtration loss was decreased,mud cake quality was improved,and simultaneously it had great reservoir protection performance,and the permeability recovery rate reached 87%.In addition,it also effectively improved the lubricity of *** sticking coefficient of mud cake was reduced by 53.4%,and the friction coefficient was ***,mMB can serve as a versatile additive to control the density,rheology,filtration,and stability of WBDFs weighted with API barite,thus regulating comprehensive performance and achieving reservoir protection *** work opened up a new path for the productive drilling of extremely deep and intricate wells by providing an efficient method for managing the performance of high-density WBDFs.

关键词： Drilling fluids Weighting materials Filtration control Reservoir protection Stability property

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Property(R)for Upper Triangular Operator Matrices

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Acta Mathematica Sinica,English Series 2023年第3期39卷 523-532页

作者： li li yang Xiao Hong CAO School of Mathematics and Statistics Shaanxi Normal UniversityXi’an 710119P.R.China

Property(R)holds for an operator when the complement in the approximate point spectrum of the Browder essential approximate point spectrum coincides with the isolated points of the spectrum which are eigenvalues of finite *** A∈B(H)and B∈B(K),where H and K are complex infinite dimensional separable Hilbert *** denote by M_(C)the operator acting on H⊕K of the form M_(C)=(AC0B).In this paper,we give a sufficient and necessary condition for M_(C)∈(R)for all C∈B(K,H).

关键词： property(R) upper triangular operator matrix spectrum

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大兴安岭乌奴耳地区白音高老组的厘定及其地质意义

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地质与资源 2024年第2期33卷 135-142,151页

作者：李利阳冯欣焦晓宇金鹏杨征中国地质调查局廊坊自然资源综合调查中心河北廊坊065000 中国地质大学地球科学与资源学院北京100083 山东省煤田地质局第三勘探队山东泰安271000

中国东北大兴安岭地区发育大量中生代火山岩,早白垩世火山岩是其重要的组成部分.目前关于早白垩世早期火山岩的地层单位归属及构造背景存在较大争议,笔者以大兴安岭乌奴耳地区的早白垩世流纹岩为研究对象,进行锆石U-Pb定年和岩石地球化... 详细信息

中国东北大兴安岭地区发育大量中生代火山岩,早白垩世火山岩是其重要的组成部分.目前关于早白垩世早期火山岩的地层单位归属及构造背景存在较大争议,笔者以大兴安岭乌奴耳地区的早白垩世流纹岩为研究对象,进行锆石U-Pb定年和岩石地球化学测定工作.结果表明:流纹岩LA-ICP-MS锆石U-Pb年龄为134.3±1.8 Ma,时代为早白垩世早期.根据岩石组合、时空展布等,将其归为白音高老组.岩石地球化学分析结果显示:乌奴耳地区的流纹岩为高硅高钾弱过铝质钙碱性系列,岩石整体富集大离子亲石元素K、Rb、Ba等,亏损大离子亲石元素Sr和高场强元素Nb、P、Ti等,轻稀土元素相对富集,重稀土元素相对亏损,具有中等的负Eu异常(δEu=0.57~0.96).结合区域地质背景及前人研究成果,认为乌奴耳地区的白音高老组形成于古太平洋西向俯冲的火山弧环境.

关键词：白音高老组锆石U-Pb年龄岩石地球化学早白垩世大兴安岭

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Kinetics of non-catalyzed hydrolysis of tannin in high temperature liquid water

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第5期9卷 401-406页

作者： li-li LU Xiu-yang LU Nan MA Institute of Pharmaceutical Engineering Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 China

High temperature liquid water(HTLW) has drawn increasing attention as an environmentally benign medium for organic chemical reactions,especially acid-/base-catalyzed reactions. Non-catalyzed hydrolyses of gallotannin and tara tannin in HTLW for the simultaneous preparation of gallic acid(GA) and pyrogallol(PY) are under investigation in our laboratory. In this study,the hydrolysis kinetics of gallotannin and tara tannin were determined. The reaction is indicated to be a typical consecutive first-order one in which GA has formed as a main intermediate and PY as the final product. Selective decomposition of tannin in HTLW was proved to be possible by adjusting reaction temperature and time. The present results provide an important basic data and reference for the green preparation of GA and PY.

关键词： High temperature liquid water Gallotannin Tara tannin Non-catalyzed hydrolysis Kinetics

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Synthesis and Characterization of Temperature-sensitive Cellulose-graftPoly(N-isopropylacrylamide) Copolymers

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Chinese Journal of Polymer Science 2015年第12期33卷 1640-1649页

作者： li-li yang Jin-ming Zhang Jia-song He 张军甘志华 Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Engineering Plastics Institute of ChemistryChinese Academy of Sciences (CAS) University of Chinese Academy of Sciences State Key Laboratory of Organic-inorganic Composites Beijing Laboratory of Biomaterials College of Life Science and Technology Beijing University of Chemical Technology

A new series of cellulose-graft-poly（N-isopropylacrylamide）（cellulose-g-PNIPAM） copolymers were prepared by atom transfer radical polymerization （ATRP） of N-isopropylacrylamide monomers from a cellulose-based macro-initiator, which was homogeneously synthesized in an ionic liquid 1-allyl-3-methylimidazolium chloride （AmimC1）. The composition of cellulose-g-PNIPAM copolymers could be adjusted by altering the feeding ratio and reaction time. The resultant copolymers with relatively high content of PNIPAM segments （molar substitution of PNIPAM ≥ 18.3） were soluble in water at room temperature. Aqueous solutions of cellulose-g-PNIPAM copolymers exhibited clear temperature-sensitive behavior, and their sol-to-gel phase transition properties were investigated by dynamic light scattering （DLS） and UV measurements. Compared with pure PNIPAM, the cellulose-g-PNIPAM copolymers possessed higher lower critical solution temperatures （LCST） in a range from 36.9 ℃ to 40.8 ℃, which are close to normal human body temperature, and could be tuned by adjusting the content of PNIPAM segments in copolymers. Spherical structure of cellulose-g-PNIPAM copolymers formed at temperatures above LCST and its morphology was observed by TEM and SEM. These novel cellulose-g-PNIPAM copolymers may be attractive substrates for some biomedical applications, such as drug release and tissue engineering.

关键词： Cellulose-g-PNIPAM ATRP Temperature-sensitive Water soluble.

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Effects of Headgroups and Serum on Gene Transfection of Alkaline Amino Acid Based Cationic lipids

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Chemical Research in Chinese Universities 2009年第1期25卷 69-71页

作者： li li yang yang NIE Yu HE Bin GU Zhong-wei National Engineering Research Center for Biomaterials Sichuan University Chengdu 610064 P. R. China

Three cationic lipids with lysylated（1）, histidylated（2）, and arginylated（3） headgroups and cholesterol hydrophobic moiety were synthesized. The average sizes of liposomes and lipoplexes were around 100 and 160 nm, respectively. The gene transfection efficiency of the three lipoplexes loaded with pGL3 or pORF-LacZ was compared on 293T cells in the presence or the absence of serum. The transfection efficiency of the three lipoplexes in a serum-free medium was 2 to 3-fold higher than that of dioleoyl-trimethylammonium propane（DOTAP）. In the presence of serum, however, most of the lipoplexes showed lower transfection activities; only lipoplex 3 retained its high transfection efficiency.

关键词： Cationic lipids Alkaline amino acids Serum Gene delivery Transfection efficiency

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Thermodynamic Calculation of Inclusion Formation in Mg-Al-Si-O System of 430 Stainless Steel Melts

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Journal of Iron and Steel Research International 2011年第2期18卷 14-17页

作者： JIANG Zhou-hua li Shuang-jiang li yang School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

A phase diagram was drawn through thermodynamic calculation to understand the equilibrium conditions of 2MgO · SiO2 , MgO · Al2O3 , 3Al2O3 · 2SIO2, and 2MgO·2Al2O3 · 5SiO2 formation in Mg-AI-Si-O system of 430 stainless steel melts at 1873 K. Further, the thermodynamic formation and transformation conditions of MgO · Al2O3 inclusion were discussed. The following results are obtained when ws, =0.26% and wo = 1.0 × 10^-5 in molten steel. The uniphase cordierite inclusion is difficult to exist stably; MgO· At203 inclusion cannot he formed in case of wAl being less than 1× 10^- 6 ; 3Al2O3 · 2SiO2 would change to MgO· Al2O3 and 2MgO · SiO2 in turn with increasing the Mg content when wAl is above 1.7× 10^- 6 ; with the formation of MgO · Al2O3 inclusion, A1 content increases with increasing Mg content when wMg is over 1. 7 × 10^- 9. For equilibrium condition and calculated steel composition, 2MgO·SiO2 inclusion would be formed ultimately and MgO · Al2O3 is almost inexistent.

关键词： phase diagram thermodynamic calculation MgO · Al2O3 inclusion 430 stainless steel

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Effect of Boron Mud and CaF_2 on Surface Tension and Density of CaO-SiO_2-B_2O_3 Ternary Slag Systems

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Journal of Iron and Steel Research International 2014年第8期21卷 745-748页

作者： li-li yang Hong-ming WANG Xiang ZHU Gui-rong li School of Materials Science and Engineering Jiangsu University Jiangsu Province Key Laboratory of High-End Structural Materials

The effect of boron mud and CaF2,which were used as fluxing agents,on surface tension and density of CaO-SiO2-B2O3 ternary slag systems was *** surface tension and density were measured by using the ring detachment method and Archimedean method,*** results indicated that surface tension and density of the slag systems decreased with increasing temperature in the range of 1380-1480℃.When 5%-10% CaF2 was employed as fluxing agent,the surface tension and density of slag were decreased with increasing CaF2 content,and the surface tension changed from 0.3to 0.6N/m,while the density changed from 3.4to 4.1g/***,when using 5%-10%boron mud as fluxing agent,the surface tension was enhanced,whereas the density decreased with the increase of boron mud content,and the variation range was 0.4-0.6N/m for surface tension and 3.2-3.9g/cm3 for the *** a conclusion,using boron mud as fluxing agent to substitute for CaF2 did not cause significant changes in slag surface tension and density.

关键词： boron mud calcium fluoride surface tension density

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ZrCl_4/Hantzsch 1,4-dihydropyridine as a new and efficient reagent combination for the direct reductive amination of aldehydes and ketones with weakly basic amines

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Chinese Chemical Letters 2007年第4期18卷 458-460页

作者： Zhen Gang liu Nan li li yang Zhong li liu Wei Yu State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 China

ZrCl4/Hantzsch 1,4-dihydropyridine is a mild and highly efficient reagent combination for the direct reductive amination. Weakly basic amines such as anilines substituted by electron-withdrawing group and heteroaromatic amines can be reductively alkylated with electron rich aldehydes and ketones under mild conditions to form the secondary amines in excellent yields.

关键词： Zirconium tetractfloride Hantzsch 1,4-dihydropyfidine Reductive amination

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