The Leakage Function of Gravity Displacement in the Narrow Safety Density Window

doi:10.11885/j.issn.1674-5086.2020.10.31.01

Abstract

Abstract: Due to gravity displacement, overflow and lost circulation occur simultaneously in fractured formations. This not only causes complicated downhole conditions and increases the difficulty of drilling pressure control, but also damage the reservoir, which will cause adverse effect on production. This paper establishes a gravity displacement model. And based on gravity displacement model, a leakage function of the gravity displacement in the narrow safety density window of high pressure gas layer has been formed. Then an experiment has been designed to testify leakage function by using the test device development of wellbore-formation coupling flow. The experimental results show that the calculated results of the leakage function are consistent with the experimental data. When drilling in fracture development formation, whether it is underbalanced drilling, balanced drilling, or overbalanced drilling, gravity displacement can't be avoided. However, when we maintain the wellbore pressure close to equilibrium (slightly exceeding), the gravity displacement phenomenon can be significantly reduced. Results of this study have important guiding significance for the mechanism of complex material exchange laws and wellbore safety control of the bottom hole when encountering fractured formations during drilling operations.

Key words: fractured formation, gravity displacement, laboratory test, mathematical model, leakage function

CLC Number:

TE28

WANG Cunxin, XU Jiaxin, LI Yong, LI Gao, XIAO Dong. The Leakage Function of Gravity Displacement in the Narrow Safety Density Window[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 201-208.

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References

[1] 李大奇, 康毅力, 刘修善, 等. 基于漏失机理的碳酸盐岩地层漏失压力模型[J]. 石油学报, 2011, 32(5):900-904. doi:10.7623/syxb201105026 LI Daqi, KANG Yili, LIU Xiushan, et al. The lost circulation pressure of carbonate formations on the basis of leakage mechanisms[J]. Acta Petrolei Sinica, 2011, 32(5):900-904. doi:10.7623/syxb201105026
[2] 王明波, 郭亚亮, 方明君, 等. 裂缝性地层钻井液漏失动力学模拟及规律[J]. 石油学报, 2017, 38(5):597-606. doi:10.7623/syxb201705013 WANG Mingbo, GUO Yaliang, FANG Mingjun, et al. Dynamics simulation and laws of drilling fluid loss in fractured formations[J]. Acta Petrolei Sinica, 2017, 38(5):597-606. doi:10.7623/syxb201705013
[3] 舒刚, 孟英峰, 李皋, 等. 重力置换式漏喷同存机理研究[J]. 石油钻探技术, 2011, 39(1):6-11. doi:10.3969/j.issn.1001-0890.2011.01.002 SHU Gang, MENG Yingfeng, LI Gao, et al. Mechanism of mud loss and well kick due to gravity displacement[J]. Petroleum Drilling Techniques, 2011, 39(1):6-11. doi:10.3969/j.issn.1001-0890.2011.01.002
[4] 徐宝昌, 孟宇, 刘伟. 控压钻井井下不可测变量的非线性估计[J]. 石油学报, 2016, 37(12):1543-1549. doi:10.7623/syxb201612010 XU Baochang, MENG Yu, LIU Wei. Nonlinear estimation of the down-hole unmeasurable variables in the managed pressure drilling system[J]. Acta Petrolei Sinica, 2016, 37(12):1543-1549. doi:10.7623/syxb201612010
[5] 曾明昌, 曾时田, 毛建华. 气井喷漏同存的处理技术研究[J]. 天然气工业, 2005, 25(6):42-44. doi:10.3321/j.issn:1000-0976.2005.06.012 ZENG Mingchang, ZENG Shitian, MAO Jianhua. Trating technioues of blowout-lost circulation conexistence in gas hole drilling[J]. Natural Gas Industry, 2005, 25(6):42-44. doi:10.3321/j.issn:1000-0976.2005.06.012
[6] 张兴全, 周英操, 刘伟, 等. 碳酸盐岩地层重力置换气侵特征[J]. 石油学报, 2014, 35(5):958-962. doi:10.7623/syxb201405017 ZHANG Xingquan, ZHOU Yingcao, LIU Wei, et al. Characters of gravity replacement gas kick in carbonate formation[J]. Acta Petrolei Sinica, 2014, 35(5):958-962. doi:10.7623/syxb201405017
[7] 张兴全, 周英操, 刘伟, 等. 欠平衡气侵与重力置换气侵特征及判定方法[J]. 中国石油大学学报(自然科学版), 2015, 39(1):95-102. doi:10.3969/j.issn.1673-5005.2015.01.014 ZHANG Xingquan, ZHOU Yingcao, LIU Wei, et al. A method for characterization and identification of gas kicks caused by underbalanced pressure and gravity displacement[J]. Journal of China University of Petroleum (Edition of Natural Science), 2015, 39(1):95-102. doi:10.3969/j.issn.1673-5005.2015.01.014
[8] 杨顺辉. 可视化重力置换室内模拟装置的研制与应用[J]. 石油机械, 2015, 43(3):96-99. doi:10.16082/j.cnki.issn.1001-4578.2015.03.021 YANG Shunhui. Development and application of lab simulation devices for visualized gravity displacement[J]. China Petroleum Machinery, 2015, 43(3):96-99. doi:10.16082/j.cnki.issn.1001-4578.2015.03.021
[9] OZDEMIRTAS M, BABADAGLI T, KURU E. Experimental and numerical investigations of borehole ballooning in rough fractures[C]. SPE 110121-PA, 2009. doi:10.2118/110121-PA
[10] 林雍森. 深水井控中地层呼吸效应的识别与处理探讨[J]. 海洋石油, 2014, 34(1):72-76. doi:10.3969/j.issn.1008-2336.2014.01.072 LIN Yongsen. Discussion on identifying and handling of formation ballooningin deep water well control[J]. Offshore Oil, 2014, 34(1):72-76. doi:10.3969/j.issn.1008-2336.2014.01.072
[11] 孔祥伟, 林元华, 邱伊婕. 控压钻井重力置换与溢流气侵判断准则分析[J]. 应用力学学报, 2015, 32(2):317-322. doi:10.11776/cjam.32.02.A012 KONG Xiangwei, LIN Yuanhua, QIU Yijie. Research of mechanism for the gas invasion and gravity replacement in drilling operations[J]. Chinese Journal of Applied Mechanics, 2015, 32(2):317-322. doi:10.11776/cjam.32.02.A012
[12] 戴成, 李皋, 肖东, 等. 裂缝气液重力置换的流动实验及仿真[J]. 应用力学学报, 2020, 37(1):195-199. doi:10.11776/cjam.37.01.A037 DAI Cheng, LI Gao, XIAO Dong, et al. Flow experiment and simulation of fracture gas-liquid gravity displacement[J]. Chinese Journal of Applied Mechanics, 2020, 37(1):195-199. doi:10.11776/cjam.37.01.A037
[13] 赵向阳, 孟英峰, 侯绪田, 等. 沥青质稠油与钻井液重力置换规律与控制技术[J]. 石油钻采工艺, 2016, 38(5):622-627. doi:10.13639/j.odpt.2016.05.015 ZHAO Xiangyang, MENG Yingfeng, HOU Xutian, et al. Pattern and control of gravity displacement between asphaltic heavy oil and drilling fluid[J]. Oil Drilling & Production Technology, 2016, 38(5):622-627. doi:10.13639/j.odpt.2016.05.015
[14] 路保平, 侯绪田, 邢树宾. 伊朗雅达油田沥青层置换机制与压力波动分析[J]. 中国石油大学学报(自然科学版), 2017, 41(6):88-93. doi:10.3969/j.issn.1673-5005.2017.06.010 LU Baoping, HOU Xutian, XING Shubin. Asphalt dis-placement mechanism and pore pressure fluctuation in Yadavaran Oilfield, Iran[J]. Journal of China University of Petroleum (Edition of Natural Science), 2017, 41(6):88-93. doi:10.3969/j.issn.1673-5005.2017.06.010
[15] PETERSEN J, ROMMETVEIT R, TARR B. Kick with lost circulation simulator, a tool for design of complex well control situations[C]. SPE 49956-MS, 1998.
[16] 郑述全, 欧云东, 曾明昌, 等. 高含硫喷漏同存气井钻井与完井工艺技术研究[J]. 天然气工业, 2006, 26(9):65-67. doi:10.3321/j.issn:1000-0976.2006.09.019 ZHENG Shuquan, OU Yundong, ZENG Mingchang, et al. Study on drilling and completion technology applied to high sulfur-content gas wells where well kicks and losses conexist[J]. Natural Gas Industry, 2006, 26(9):65-67. doi:10.3321/j.issn:1000-0976.2006.09.019
[17] 刘绘新, 李锋. 裂缝性储层井控技术体系探讨[J]. 天然气工业, 2011, 31(6):77-80. doi:10.3787/j.issn.1000-0976.2011.06.016 LIU Huixin, LI Feng. Well control technologies for fractured gas reservoirs[J]. Natural Gas Industry, 2011, 31(6):77-80. doi:10.3787/j.issn.1000-0976.2011.06.016
[18] XIAO Dong, MENG Yingfeng, ZHAO Xiangyang, et al. Liquid-liquid gravity displacement in a vertical fracture during drilling:Experimental study and mathematical model[J]. Energy Exploration & Exploitation, 2019, 38(2):533-554. doi:10.1177/0144598719874467
[19] XIAO Dong, MENG Yingfeng, LI Gao, et al. Development of a mathematical model and experimental validation of borehole instability due to gravity displacement during drilling in a fractured formation[J]. Journal of Petroleum Science and Engineering, 2018, 168:217-225. doi:10.1016/j.petrol.2018.05.030
[20] JEONG W C, SONG J W. Numerical investigations for flow and transport in a rough fracture with a hydromechanical effect[J]. Energy Sources, 2005, 27(11):997-1011. doi:10.1080/00908310490450827
[21] BAGHBANAN A, JING L. Stress effects on permeability in a fractured rock mass with correlated fracture length and aperture[J]. International Journal of Rock Mechanics & Mining Sciences, 2008, 45(8):1320-1334. doi:10.1016/j.ijrmms.2008.01.015
[22] IVARS D M. Water inflow into excavations in fractured rock:A three-dimensional hydro-mechanical numerical study[J]. International Journal of Rock Mechanics & Mining Sciences, 2006, 43(5):705-725. doi:10.1016/j.ijrmms.2005.11.009
[23] IWAI K. Fundamental studies of the fluid flow through a single fracture[D]. Berkeley:University of California at Berkeley, 1977. doi:10.1016/0148-9062(79)90543-6
[24] 杨顺辉, 赵向阳, 豆宁辉, 等. 基于真实裂缝的井筒地-层耦合流动试验装置研制[J]. 科学技术与工程, 2018, 18(10):35-41. doi:10.3969/j.issn.1671-1815.2018.10.006 YANG Shunhui, ZHAO Xiangyang, DOU Ninghui, et al. The test device development of wellbore-formation coupling flow based on real fracture[J]. Science Technology and Engineering, 2018, 18(10):35-41. doi:10.3969/j.issn.1671-1815.2018.10.006