ANALYSIS ON OPEN HOLE STABILITY OF A DEEP GAS WELL WITH HIGH PRESSURE DURING TESTING
-
摘要: 高压深气井裸眼试气期间，由于井内液柱压力较低，不能很好地支撑井壁，裸眼段可能发生井壁坍塌。在非均匀构造应力作用下井壁周围地应力分布的基础上，考虑井壁周围地层温度变化引起的热应力场和高压流体渗流引起的渗流应力场，并结合Mohr-Coulomb准则，可以确定防止高压深井试气期间井壁坍塌的井内当量流压，依此指导垫液、压井液的密度和高度，可确保测试工作顺利进行。Abstract: During testing of the open hole of high pressure and deep gas well, borehole collapse may occur in open-hole sections, because borehole fluid pressure was too low to support the borehole wall. Based on stress distribution near wellbore area under non-uniform tectonic stresses, seepage stress field caused by high-pressure fluid flow through porous medium and thermal stress field due to temperature changes, and combined with the Mohr-Coulomb criterion, we can determine the well equivalent flow pressure which can prevent collapsing. In addition, it may guide density and height of fluid cushion and well control fluid, which will ensure work smoothly.
-
图 1 非均匀构造应力及井内流体压力分解模型
Figure 1. The decomposition model of non-uniform tectonic stress and fluid pressure inside the well
图 2 塔里木库车山前某高压深气井6000~6010 m地层粘聚力及内摩擦角变化曲线
Figure 2. Curve of variation of the cohesion and internal frictional angle in 6000~6010 m formation of the high pressure and deep gas well in Tarim Kuche Piedmont
-
[1] 程远方, 黄荣樽.钻井工程中泥页岩井壁稳定的力学分析[J].中国石油大学学报:自然科学版, 1993, 17(4):35~39. http://www.cnki.com.cn/Article/CJFDTOTAL-SYDX199304005.htmCHENG Yuan-fang, HUANG Rong-zun. Mechanical analysis of borehole stability in shale formation in drilling[J]. Journal of the University of Petroleum, China:Edition of Natural Science, 1993, 17(4):35~39. http://www.cnki.com.cn/Article/CJFDTOTAL-SYDX199304005.htm [2] 刘玉石.地层坍塌压力及井壁稳定对策研究[J].岩石力学与工程学报, 2004, 23(14):2421~2423. doi: 10.3321/j.issn:1000-6915.2004.14.023LIU Yu-shi. Collapse pressure and precautions for stability of wellbore wall[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(14):2421~2423. doi: 10.3321/j.issn:1000-6915.2004.14.023 [3] 陈勉, 金衍.深井井壁稳定技术研究进展与发展趋势[J].石油钻探技术, 2005, 33(5):28~33. http://www.cnki.com.cn/Article/CJFDTOTAL-SYZT200505007.htmCHEN Mian, JIN Yan. Advances and developmental trend of the wall stability technique[J]. Petroleum Drilling Techniques, 2005, 33(5):28~33. http://www.cnki.com.cn/Article/CJFDTOTAL-SYZT200505007.htm [4] 金衍, 陈勉, 柳贡慧, 等.大位移井的井壁稳定力学分析[J].地质力学学报, 1999, 5(1):4~11. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=19990103&journal_id=dzlxxbJIN Yan, CHEN Mian, LIU Gong-hui, et al. Well bore stability analysis of extended reach wells[J].Journal of Geomechanics, 1999, 5(1):4~11 http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=19990103&journal_id=dzlxxb [5] 陈勉, 金衍, 张广清.石油工程岩石力学[M].北京:科学出版社, 2008:56~58.CHEN Mian, JIN Yan, ZHANG Guang-qing. Rock mechanics in petroleum engineering[M]. Beijing:Science Press, 2008:56~58. [6] 李志明, 殷有泉.油水井套管外挤力计算及其力学基础[M].北京:石油工业出版社, 2006:97~100.LI Zhi-ming, YIN You-quan. Oil and water well casing external collapse load calculation and mechanics[M]. Beijing:Petroleum Industry Press, 2006:97~100. [7] 刘玉石, 周煜辉, 黄克累.井眼温度变化对井壁稳定的影响[J].石油钻采工艺, 1996, 18(4):1~4. http://www.cnki.com.cn/Article/CJFDTOTAL-SYZC199604000.htmLIU Yu-shi, ZHOU Yu-hui, HUANG Ke-lei. The temperature influence on borehole stability[J]. Oil Drilling & Production Technology, 1996, 18(4):1~4. http://www.cnki.com.cn/Article/CJFDTOTAL-SYZC199604000.htm [8] 何湘清, 刘向君, 罗平亚.温度扰动对井壁稳定和油田开发的影响[J].天然气工业, 2003, 23(1):39~41. http://www.cnki.com.cn/Article/CJFDTOTAL-TRQG200301012.htmHE Xiang-qing, LIU Xiang-jun, LUO Ping-ya. Influence of temperature perturbation on borehole wall stabilization and oil field development[J]. Natural Gas Industry, 2003, 23(1):39~41. http://www.cnki.com.cn/Article/CJFDTOTAL-TRQG200301012.htm [9] 蔚宝华, 王炳印, 曲从锋, 等.高温高压储层安全钻井液密度窗口确定技术[J].石油钻采工艺, 2005, 27(3):31~37. http://www.cnki.com.cn/Article/CJFDTOTAL-SYZC200503014.htmYU Bao-hua, WANG Bing-yin, QU Cong-feng, et al. Mud density determination of HT/HP reservoir formation[J]. Oil Drilling & Production Technology, 2005, 27(3):31~37. http://www.cnki.com.cn/Article/CJFDTOTAL-SYZC200503014.htm [10] 杨秀夫, 刘希圣.地层孔隙压力对井壁附近应力分布的影响[J].中国石油大学学报:自然科学版, 1997, 21(5):27~29, 34, 115. http://www.cnki.com.cn/Article/CJFDTOTAL-SYDX199705009.htmYANG Xiu-fu, LIU Xi-sheng. Influence of pore pressure on stresses distribution around a borehole[J]. Journal of the University of Petroleum, China:Natural Science Edition, 1997, 21(5):27~29, 34, 115. http://www.cnki.com.cn/Article/CJFDTOTAL-SYDX199705009.htm [11] Fjaer E, Holt R M, Sorsrud P, et al. Petroleum related rock mechanics[M]. 2nd Edition. Amsterdam:Elsevier Science Publishing Company Inc., 1992:109~120. [12] 吴家龙.弹性力学[M].北京:高等教育出版社, 2004:152~153.WU Jia-long. Elasticity[M]. Beijing:Higher Education Press, 2004:152~153. [13] Wu B, Tan C P. Sand production prediction of gas field-methodology and field application[C]//Society of Petroleum Engineers. Papers of SPE/ISRM Rock Mechanics Conference. Perth:Society of Petroleum Engineers Inc., 2002:78234~MS. -
下载:
点击查看大图
图(3)
计量
- 文章访问数: 101
- HTML全文浏览量: 60
- PDF下载量: 8
- 被引次数: 0
