Effect of Microannulus on Sonic Wave Propagation at First Cementing Interface
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摘要: 为消除微环隙对固井质量评价的影响，研究微环隙对声波传播的影响规律是非常必要的。针对微环隙对声波传播的影响，分别进行了实验室试验和理论计算。试验采用简化的平板模型，用中间挖空填水的超薄塑料薄膜来模拟充水微环隙。根据试验模型的特点，由声波在多层介质平面层的透射理论得到微环隙影响声波传播的理论计算公式。试验结果表明，声波首波幅度随微环隙尺寸的增大而减小，当微环隙尺寸增大至0.1 mm时声波透射幅度减小70%左右，这会造成测井时接收到的反射波声幅的增大，可能将固井质量合格的井解释为不合格。理论计算印证了试验结果，同时也说明声波传播对充气微环隙的敏感程度高于充水微环隙。研究得出，微环隙对声波传播的影响是非常显著的，在声波测井中其影响规律可以应用于对固井质量的评价中。Abstract: To eliminate the effect of microannulus on cementing quality evaluation,it is necessary to investigate the effect of microannulus on sonic wave propagation.Experimental study and theoretical analysis were used to conduct this research.Adopting a simplified plate model,the microannulus was simulated by thin plastic film filled with water.According to the characteristics of the experimental model,the calculation formula that microannulus effects sonic wave was obtained by using the theory of sonic wave transmission in multi-medium plane layer.Experimental results showed that first sonic amplitude decreases with the increase of microannulus size,when microannulus size is increased to 0.1 mm,the sonic wave amplitude will be decreased by 70%.This will lead to an increase of received amplitude in logging and cause incorrect cementing explanation and evaluation.Both theoretical calculations and experimental study showed that sensitivity of sonic wave propagation in microannulus with air is higher than that filled with water,the effect of microannulus size on sonic wave propagation is very significant,its regularity could be used to evaluate the cementing quality by sonic logging.
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Keywords:
- first interface /
- microannulus /
- sonic logging /
- cementing quality /
- multilayered medium /
- laboratory testing
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[1] 郭辛阳, 沈忠厚, 步玉环, 等.固井微环空成因研究进展及解决方法[J].钻采工艺, 2009, 32(5):1-3. Guo Xinyang, Shen Zhonghou, Bu Yuhuan, et al. Research development of cementing microannular and its solving methods[J]. Drilling Production Technology, 2009, 32(5):1-3. [2] 高伟勤, 曲天虹, 刘有全, 等.用声波变密度测井识别微环的影响[J].河南石油, 2004, 18(增刊1):71-72. Gao Weiqin, Qu Tianhong, Liu Youquan, et al.To recognize the Influence of micro-annuli with acoustic variable density logging[J].Henan Petroleum, 2004, 18(supplement 1):71-72. [3] 宋杰, 赵庆东, 廖艳, 等.浅谈水泥胶结测井中的"微环"现象[J].国外测井技术, 2003, 18(2):29-30. Song Jie, Zhao Qingdong, Liao Yan, et al.Discussion on the phenomenon of "micro-annulus" in cement bond logging[J].Foreign Logging Technology, 2003, 18(2):29-30. [4] 池英柳, 陈宪侃.雁翎油田注入氮气沿微环隙窜流的可能性分析[J].石油大学学报:自然科学版, 1994, 18(1):10-16. Chi Yingliu, Chen Xiankan.Possibility of injected nitrogen channeling through micro-annulus in Yanling Oilfield[J].Journal of the University of Petroleum, China:Edition of Natural Science, 1994, 18(1):10-16. [5] 杨燕, 杨远光, 卢家亭, 等.工作液密度降低对水泥环界面胶结的影响[J].石油学报, 2010, 31(2):333-337. Yang Yan, Yang Yuanguang, Lu Jiating, et al.Effect of density reduction of operating fluid in casing on interface cementation of cement sheath[J].Acta Petrolei Sinica, 2010, 31(2):333-337. [6] 解宇宁, 周晓宇.微环隙对声幅测井影响的定量计算及校正[J].石油钻探技术, 2013, 41(1):45-50. Xie Yuning, Zhou Xiaoyu.Quantitative calculation and correction of the influence of microannulus on acoustic amplitude log[J].Petroleum Drilling Techniques, 2013, 41(1):45-50. [7] 杨振杰, 李家芬, 苏长明.钻井工程固井胶结界面研究现状[J].石油钻探技术, 2005, 33(6):1-5. Yang Zhenjie, Li Jiafen, Su Changming.The status quo of researches on bonding interface of well cementing[J].Petroleum Drilling Techniques, 2005, 33(6):1-5. [8] Frisch G, Graham L, Griffith J.A novel and economical processing technique using conventional bond logs and ultrasonic tools for enhanced cement evaluation:SPWLA 41 Annual Logging Symposium, June 4-7, 2000.
[9] Jutten J J, Hayman A J.Micro-annulus effect on cementation logs:experiments and case histories[R].SPE 25377, 1993.
[10] 刘继生, 王克协, 谢荣华, 等.套管-水泥界面微间隙的检测方法及应用[J].测井技术, 2002, 26(5):399-401, 413. Liu Jisheng, Wang Kexie, Xie Ronghua, et al.Identification method and application examples of the annulus between casing and cement sheath[J].Well Logging Technology, 2002, 26(5):399-401, 413. [11] Boukhelifa L, Moroni N, James S G, et al.Evaluation of cement systems for oil and gas well zonal isolation in a full-scale annular geometry[J][R].SPE Drilling Completion, 2005, 20(1):44-53.
[12] 段方勇, 黄载禄, 蔡德钧, 等.层状介质中声波传播的一维数学模型[J].华中理工大学学报, 1993, 21(6):48-51. Duan Fangyong, Huang Zailu, Cai Dejun, et al.A one-dimensional mathematical model of acoustic wave propagation in layered media[J].Journal Huazhong(Central China)University of Science and Technology, 1993, 21(6):48-51.
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