Mechanisms of casing damage during shale gas well fracturing treatment

被引：0
|
作者：
Zhang Z. [1 ]
Liu J. [1 ]
Liu H. [2 ]
Li L. [2 ]
Zhao Y. [1 ]
Ding J. [1 ]
Yang K. [1 ]
Song C. [1 ]
机构：
[1] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan
[2] CNOOC China Limited Zhanjiang Branch, Zhanjiang, 524057, Guangdong
来源：
Natural Gas Industry | 2019年 / 39卷 / 10期
关键词：
Casing damage; Fracturing; Large displacement; Local trap; Shale gas well; Steel grade; Thermal expansion; Wall thickness;
D O I：
10.3787/j.issn.1000-0976.2019.10.010
中图分类号：
学科分类号：
摘要：
Local traps are formed in the near wellbore zone after large displacement fracturing was conducted in shale gas wells. Due to a great temperature difference, the thermal expansion of local traps produces axial force, which brings about an additional stress to casing. As a result, the casing is buckled or deformed, and even damaged. Concerning, the additional pressure model of local trap was established under the theoretical guidance of thermodynamic principle, energy conservation law and fluid transient heat transfer mechanism. The influence of fracturing displacement and total injection volume on wellbore temperature field was studied. The anti-collapse safety state of production casing was evaluated by calculating the additional pressure of local trap in the production intervals caused by fracturing. Under the condition of large displacement fracturing, the wellbore temperature varied with injection volume and displacement, and the larger the displacement, the greater the decrease of wellbore temperature. When the displacement was constant, the wellbore temperature decreased gradually with the increase of injection volume and injection time, but the variation decreased gradually. With the injection of fracturing fluid, the bottomhole temperature decreased rapidly within the first 0.5 hr and then stabilized near a certain value. Fourth, the fluid's thermal expansion coefficient and isothermal compressibility coefficient are also the main factors affecting the magnitude of thermal expansion pressure.
引用
收藏
页码：82 / 87
页数：5
相关论文
共 27 条
  • [1] Lian Z., Yu H., Lin T., Guo J., A study on casing deformation failure during multi-stage hydraulic fracturing for the stimulated reservoir volume of horizontal shale wells, Journal of Natural Gas Science and Engineering, 23, pp. 538-546, (2015)
  • [2] Wang Z.G., Liu Y.S., He J.F., Zhang C.F., Zhang C.J., Guo X.W., Study of separate layer fracturing techniques on casing-damaged wells, Journal of Canadian Petroleum Technology, 48, 5, pp. 38-44, (2009)
  • [3] Ricci W.M., Streubel P.N., Morshed S., Collinge C.A., Nork S.E., Gardner M.J., Risk factors for failure of locked plate fixation of distal femur fractures: An analysis of 335 cases, Journal of Orthopaedic Trauma, 28, 2, pp. 83-89, (2014)
  • [4] Li J., Li Y., Zhang D., Yang H., Sun S., Analysis of casing damage for staged fracturing in shale gas well, Fault-Block Oil & Gas Field, 24, 3, pp. 387-390, (2017)
  • [5] Wang Q., Zhang L., Hu J., Wang H., Li K., He W., Multiple angles identification on failure influence factors of fracturing casing deformation, Journal of Safety Science and Technology, 13, 6, pp. 40-46, (2017)
  • [6] Sugden C., Johnson J., Chambers M., Ring G., Suryanarayana P.V., Special considerations in the design optimization of the production casing in high-rate, multistage-fractured shale wells, SPE Drilling & Completion, 27, 4, pp. 459-472, (2012)
  • [7] Zhang Z., Zhou Y., Fu J., Chen M., Li W., Shi T., A method of well integrity design for sour gas wells, Natural Gas Industry, 30, 3, pp. 67-69, (2010)
  • [8] Zhang Z., Li Y., Zhang C., Huang Y., Guo Y., Luo L., Et al., Wellbore integrity design of high-temperature gas wells containing CO<sub>2</sub>, Natural Gas Industry, 33, 9, pp. 79-86, (2013)
  • [9] Zhang Z., Zhang L., Thermal stress model for the free-casing section to be used for high-temperature and high-yield gas wells, Journal of Safety and Environment, 15, 4, pp. 98-102, (2015)
  • [10] Yu H., Lian Z., Xu X., Yu W., Wang F., Zuo J., Numerical simulation for casing failure during volumetric fracturing of shale gas vertical wells, China Petroleum Machinery, 43, 3, pp. 73-77, (2015)
123