第38参第5期 2016年9月
石油钻采工艺
OIL DRILLING & PRODUCTION TECHNOLOGY
文章编号：10007393(2016)05059407
DOI: 10.13639/j.odpt.2016.05.010
水泥环力学参数与载荷间的适应性
张景富吕英渤，刘硕琼’徐明？张强】李勇？
1.东北石油大学提高油气采收率教育部重点实验宝；2.中国石油集团钻并工程技术研究院
Vol. 38 No. 5 Sept. 2016
引用格式：张景富，吕英激，刘硕琼，徐明，张强，李勇.水泥环力学参数与载荷间的适应性[J].石油钻采工艺，2016,385)： 594-600
擒要：为选择水泥环力学参数，保障水泥环对图效能，利用套管-水泥环-地层组合体结合有限元力学模型，研究了蝎变地层不同深条件下水泥环屈服强度、弹性模量、载荐对界面应力及破环形式的影响，分析了强度、弹性模量与载荐的力学适应性关系。结果表明：套管内加载时井口处水泥环易于发生周向拉伸破环，井下水泥环则易于发生屈服和出现高的压应力。加载中水泥环发生弹性变形时，水泥环屈服强度对界面各应力不产生影响；弹性模量增加，累面各应力增加。水泥环发生屈服变形时，水泥环届服强度增加，累面各应力均增大；弹性模量增加，界面接触压力增大，内界面周向应力降低；卸载时井口处水泥环易于发生胶结界面撕裂。水混环具有低弹性模量、适当届服强度、高抗粒强度、高胶结界面强度时承载能力高。
关键词：水泥环；强度；弹性模量；载荷；适应性；承载能力
中图分类号：TE256
文献标识码：A
Adaptabilityamongloads and mechanicalparametersof cement sheath
ZHANG Jingfu', LYU Yingbo', LIU Shuoqiong , XU Ming , ZHANG Qiang , LI Yong
1. Key Laboratory of EOR of Ministry of Education, Northeast Petrolerm University, Daqing, Heilongjiang 163318, China;
2 CNPC Drilling Ergineering Technology Research Insritarte, Bejing 102206, China
Citation: ZHANG Jingfu, LYU Yingbo, LIU Shuoqiong, XU Ming, ZHANG Qiang, LI Yong. Adaptability among loads and me-chanical parameters of cement sheath [J . Oil Drilling & Production Technology, 2016, 38(5): 594-600
Abstraet: To identify optimal mechanical parameters and achieve reliable sealing performances of cement sheath, impact of yield strength, elastic modulus, load of cement sheath on interfacial stress and mode of destruction has been studied, and mechanical adapt-ability among strength, elastic modulus and load have been reviewed, based on the finite-element mechanical model representing the in-corporation of casing-cement sheath-formation, in the creep formation at different well depths. Research results show the cement sheath around wellhead is susceptible to circumstantial stretching with load in casing, whereas the downhole cement sheath is susceptible to as ai sea eoa e e eaa assas ssa sheath may produce no impact on various stresses on interface. At the same time, various stresses on interface may increase with the increase of elastic modulus. When the cement sheath experiences yield deformation, yield strength of the cement sheath may increase, together with the increase in various stresses on interface. When elastic modulus increases, interfacial contact pressure may increasc too, whereas the circumferential stress on internal surface may decrease. During unloading, cement sheath around the wellhead may susceptible to tearing of cementation interface. Generally speaking, cement sheaths have low elastic modulus, moderate yield strength, high tensile strength, and high carrying capacity in high cementation interfacial strength.
Key words: cement sheath; strength; elastic modulus; load; adaptability; carrying capacity
基金项目：国家白然科学基会项目“油并水泥环环空对图可靠性力学分析与研究（端号：51474074)；黑龙江有白然科学基金（端号：
E201334)。
第一作者：张景富（1963-)教投、博士生导师，主要从事沟并本况材料物理化学与力学、国并技术、钻井工作液力学等方面的研究。通试
地址;(163318)黑龙江省大庆市高新技术开发区东北.石油大学。E-mail；zjf286@126.con
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