矿物纤维增强覆膜砂的界面力学模型研究.pdf

第42卷第4期
石油钻探技术
Vol. 42 No 4
2014年7月
PETROLEUM DRILLING TECHNIQUES
Jul.,2014
く油气开采
doi:10.3969/j.is.1001-0890.2014.04.016
矿物纤维增强覆膜砂的界面力学模型研究
陈诚,姚晓',武明鸣2,宋金波2
(1.南京工业大学材料科学与工程学院,江苏南京210009;2.中国石化胜利油田分公司采油工艺研究院,山东东营257000
摘要:为深入了解纤维复合防砂技术中纤维复合砂体的增强作用机理,对纤维与覆膜砂表面树脂层的界面
性质进行了研究。基于纤维增强复合材料的剪滞理论模型,对单纤维一树脂层微元体进行了界面力学分析;根据矿
物纤维覆膜砂体的特征,对剪滞理论模型进行了修正,建立了可定量计算纤维覆膜砂体抗压强度的剪滞理论力学
模型。研究发现,覆膜砂体具有宏观颗粒多孔特征和树脂反应收编产生的大量微裂缝和微孔隙,使砂体应力集中,导
致其在60和80℃温度下的抗压强度分别为2.75和8.88MPa;矿物纤維与覆膜砂体为点接触,每个接触点的有效粘
结长度为0.3mm左右;覆膜砂体中加入0.2%矿物纤维后,纤维复合砂体的抗压强度比空白砂体提高了0.92MPa
研究结果表明,最大剪应力与纤维有效粘结长度呈双曲正切函数关系,纤维有效粘结长度等于所用覆膜砂粒的半
径,修正模型从界面力学的角度解释了纤维增强覆膜砂的作用机理,并可在较小误差范围内定量计算适当纤维掺
量下纤维复合砂体的抗压强度
关键词:纤维防砂覆膜砂增强机理カ学分析界面力学
中图分类号:TE358+.1文献标识码:A文章编号:1001-0890(2014)04-0086-05
Interface Mechanical Model of Mineral Fiber-resin Coated Sand
Chen Cheng, Yao Xiao, Wu Mingming, Song Jinbo
1. College of Materials Science and Engineering, Nanjing Technology University, Nanjing, Jiang
Abstract. To further understand the enhancement mechanism of the fiber-resin coated sand contro
technique, the interfacial mechanical properties of fiber and resin coat were analyzed. The shear-lag model
of fiber-reinforced composites was used to analyze the interfacial mechanics of single fiber-resin infinitesi
mal element. Then, this model was modified according to the characteristics of the mineral fiber-resin coated
sand, into a shear-lag mechanical model that could quantify the compressive strength of the fiber-resin coa-
ted sand. SEM showed that there were a large number of micro-cracks and micro-pores resulting from resin
compressive strength only 2.75 Mpa(60 C)and 8.88 Mpa(80) Point contact existed between mineral
fiber and resin coated sand, with net bond length approximately 0.3 mm at each point. The compressive
strength of the fiber-resin coated sand with 0.2% mineral fibers was 0. 92 Mpa higher than that of blank
sample. The results proved that there was a hyperbolic tangent function relationship between the maximum
shear stress and the effective bond length of fiber, and the effective bond length of fiber was equal to the rad
us of the resin coated sand. The modified model provided a more reasonable explanation of mechanism of the fiber
resin coated sand from the perspectie of intface mechanics, and allowed te quantitative calculation of the com-
pressive strength of fiber-resin coated sand with a appropriate fiber content in a small error range.
Key words: fiber; sand control; resin coated sand; enhancement mechanism; mechanical analysis; inter
face mechanical
纤维复合防砂技术的核心是在覆膜砂中加入纤响复合砂体性能的界面力学性质0这一主要因
维,该技术可以弥补传统防砂技术的缺陷,提高
覆膜砂的挡砂性能,延长防砂有效期,降低综合成
收稿日期:2014-02-23;改回日期:2014-06-03
作者简介:陈诚(1988),男,江苏盐城人,2012年毕业于扬州
本,具有增产及防砂的双重效果。纤维复合砂体的
大学高分子材料与工程专业,在读硕上研究生,主要从事油田化学材
强度直接决定着防砂效果及有效期,目前主要基于
料方面的研究。
联系方式:(025)83587253, chiha1988sina.con
纤维间距理论和复合材料理论?解释纤维增强覆
通讯作者:姚晓, yaoxian(@njut. edu, cn。系本刊编委
膜砂的作用机理,但由于覆膜砂中纤维直接与覆膜
基金项目:中国石油化工股份有限公司前唸性项目“纤维在防砂
堵调倾域可行性研究”(编号:P13045)和江苏高校优势学科建设工
砂表面的树脂层相互作用,这2种理论均未涉及影程项目资助。