Stress Analysis of the Cement Sheath under both Pressure and Temperature
-
摘要: 高温高压井中井筒压力和温度变化较大,会给水泥环的力学性能带来严重影响.基于弹性力学多层厚壁圆筒理论,建立了耦合压力、温度的水泥环力学理论模型,研究了水泥环中径向应力和切向应力的分布规律.研究表明:持续套管压力值为10~50 MPa且井筒温度变化值为-50~50 ℃时,水泥环总体上沿径向受压,沿切向受拉,二者最大值均位于水泥环内壁;井筒温度变化值一定时,水泥环中径向压应力和切向拉应力随持续套管压力值的增大而增大;持续套管压力值一定时,水泥环中径向压应力和切向拉应力随井筒温度的升高而增大,随井筒温度降低而减小;井筒温度升高会加剧水泥环的切向受拉失效风险,井筒温度降低却可能导致水泥环径向密封失效.因此,高温高压井应考虑井筒温度变化对水泥环应力的影响,建议采用低弹性模量水泥浆固井,并提高水泥环与套管和地层的胶结强度,以提高水泥环的整体力学性能.Abstract: Significant changes of the wellbore pressure and temperature in HPHT wells may bring great challenges to the mechanical integrity of the cement sheath.On the basis of the multi-layer thick wall cylinder theory of elastic mechanics,this paper proposed a mechanical theoretical model of cement sheath under both pressure and temperature,and investigated the distribution of radial and tangential stresses within cement sheath.Results of studies demonstrate that when the sustained casing pressure(SCP)is 10-50MPa and wellbore temperature change(WTC)is -50-50℃,the cement sheath is generally radially compressed and tangentially tensioned,and the maximum compressed and tangential stresses are both at the inner wall of the cement sheath.When the WTC keeps constant,both stresses increase with the increase of the pressure inside the casing.When the SCP is constant,both stresses increase with the increase of the WTC and decrease with the decrease of the WTC.A wellbore temperature increase will aggravate the possibility of tangential tensile failure in cement sheath,and a wellbore temperature decrease will lead to its failure due to radial tension.Consequently,wellbore temperature changes should be considered for their effect on the stress of the cement sheath,and the cement with lower elastic modulus and higher bond stength with casing and formation should be used to enhance the comprehensive mechanical performance of cement sheath in HPHT wells.
-
Keywords:
- high temperature /
- high pressure /
- cement sheath /
- theoretical model /
- stress analysis
-
-
[1] Nevio M,Augusto Z,Enrico B,et al.Intelligent and interventionlesszonal isolation for well integrity in Italy[R].SPE 119869,2009.
[2] NORSOK Standard D-010 Well integrity in drilling and well operations[S].
[3] 张智,周延军,付建红,等.含硫气井的井筒完整性设计方法[J].天然气工业,2010,30(3):67-69. Zhang Zhi,Zhou Yanjun,Fu Jianhong,et al.A method of well integrity design for sour gas wells[J].Natural Gas Industry,2010,30(3):67-69. [4] Dan T M,Virgilio G,Robert L D,et al.Characterizing casing-cement-formation interactions under stress conditions:impact on long-term zonal isolation[R].SPE 90450,2004.
[5] Laidler A,Taoutaou S,Johnson C R,et al.A risk analysis approach using stress analysis models to design for cement sheath integrity in a multilateral well[R].SPE 11059,2007.
[6] 王耀锋,李军强,杨小辉.套管-水泥环-地层系统应力分布规律研究[J].石油钻探技术,2008,36(5):7-10. Wang Yaofeng,Li Junqiang,Yang Xiaohui.Stress distribution in casing-cement-stratum[J].Petroleum Drilling Techniques,2008,36(5):7-10. [7] 李静,林承焰,杨少春,等.套管-水泥环-地层耦合系统热应力理论解[J].中国石油大学学报:自然科学版,2009,33(2):63-69. Li Jing,Lin Chengyan,Yang Shaochun,et al.Theoretical solution of thermal stress for casing-cement-formation coupling system[J].Journal of China University of Petroleum:Edition of Natural Science,2009,33(2):63-69. [8] Li Yong,Liu Shuoqiong,Wang Zhaohui,et al.Analysis of cement sheath coupling effects of temperature and pressure in non-uniform in-situ stress field[R].SPE 131878,2010.
[9] Nabipour A,Joodi B,Sarmadivaleh M.Finite element simulation of downhole stresses in deep gas wells cements[R].SPE 132156,2010.
[10] 高孝巧,杨浩,熊繁升,等.油质岩原位加热井下温度场及热应力研究[J].断块油气田,2014,21(3):373-377. Gao Xiaoqiao,Yang Hao,Xiong Fansheng,et al.Temperature field and thermal stress of downhole system for in-situ heating on oil shale[J].Fault-Block Oil Gas Field,2014,21(3):373-377. -
期刊类型引用(11)
1. 翁定为，孙强，梁宏波，雷群，管保山，慕立俊，刘汉斌，张绍林，柴麟，黄瑞. 低渗透老油田柔性侧钻水平井挖潜技术. 石油勘探与开发. 2025(01): 194-203 . 
百度学术
2. 卢聪，李秋月，郭建春. 分布式光纤传感技术在水力压裂中的研究进展. 油气藏评价与开发. 2024(04): 618-628 . 百度学术
3. 叶志权，肖雷，王丽峰，薛浩楠，王晗. 小井眼连续油管多簇射孔填砂分段压裂技术——以百口泉油田百1断块X井为例. 油气井测试. 2023(01): 33-37 . 百度学术
4. 李娜. 水平井分段多簇压裂技术影响因素. 化学工程与装备. 2023(07): 97-98 . 百度学术
5. 柳军，杜智刚，牟少敏，王睦围，张敏，殷腾，俞海，曹大勇. 连续油管分簇射孔管柱通过能力分析模型及影响因素研究. 特种油气藏. 2022(05): 139-148 . 百度学术
6. 张文康. 长庆油田陇东地区页岩油水平井细分切割压裂技术. 石化技术. 2022(12): 139-141 . 百度学术
7. 邹立萍，邹昌柏. 关于水平井压裂工艺技术现状及展望. 当代化工研究. 2021(10): 7-8 . 百度学术
8. 苗娟，黄兵，谢力，汤明. 高钢级套管段铣工具优化及性能评价. 特种油气藏. 2021(02): 163-170 . 百度学术
9. 李杉杉，孙虎，张冕，池晓明，刘欢. 长庆油田陇东地区页岩油水平井细分切割压裂技术. 石油钻探技术. 2021(04): 92-98 . 本站查看
10. 谢慧华，马青印，辛红伟，田相元，孔春岩，贺亚杰. 文留油田盐间油藏深部双层套管开窗侧钻技术. 断块油气田. 2021(05): 706-710 . 百度学术
11. 李海涛，罗红文，向雨行，安树杰，李颖，蒋贝贝，谢斌，辛野. DTS/DAS技术在水平井压裂监测中的应用现状与展望. 新疆石油天然气. 2021(04): 62-73 . 百度学术
其他类型引用(6)
计量
- 文章访问数: 2699
- HTML全文浏览量: 75
- PDF下载量: 3544
- 被引次数: 17
下载:
