The Influence of Countercurrent Spontaneous Imbibition on the Collapse Pressure of Shale Oil Reservoirs
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摘要:
页岩油储层在采用水基钻井液欠平衡钻进时，由于毛细管力作用，钻井液滤液仍会进入地层，降低地层稳定性。为此，进行了逆流自吸效应对页岩油储层坍塌压力的影响规律研究。基于两相渗流理论，建立了逆流自吸作用下的水侵模型，分析发现页岩油储层井眼附近的含水饱和度随欠压差值增大而降低；在考虑水化作用对地层岩石强度的影响的基础上，建立了井周应力模型，对页岩油储层的坍塌压力当量密度变化规律进行了分析。研究发现：逆流自吸作用下，钻井时间越长，欠压差值越小，页岩油储层坍塌压力越大，越不利于井眼稳定；当只改变欠压差值时，页岩油储层最大井径扩大率存在最小值。研究认为，建立的井周应力模型可为页岩油储层欠平衡钻井设置合理欠压差值以及调整钻井液密度提供理论依据。
Abstract:During under-balanced drilling in a shale reservoir, water based drilling fluid can enter the formation due to capillary force when the under-pressure difference is small.Thus, it causes pore pressure change around the wellbore and reduces the stability of the borehole.Becuase of the potential for blowouts, there is a significant need to to carry out the research on the influence law of countercurrent spontaneous imbibition on wellbore collapse pressure in under-balanced drilling.In this paper we discuss how we established a water invasion model of shale reservoir considering the countercurrent spontaneous imbibition in under-balanced drilling which we based on two-phase seepage theory.Our work demonstrates that water saturation near the wellbore will decrease as the under-pressure difference increases.Considering rock strength changes with hydration we set up a stress analysis model near wellbore and studied the equivalent mud density of wellbore collapse pressure of shale.It can be determined from the model that longer drilling times will generate smaller under-pressure differences, and a alarger variation range of water saturation near the borehole will cause lower collapse pressure considering the influence of countercurrent spontaneous imbibition, which is more unfavorable for borehole stability.When other parameters remain constant except for under-pressure difference, a minimum borehole diameter enlargement rate is achieved in the shale.This borehole stability model can provide a theoretical basis for setting a reasonable under-pressure difference and adjusting the drilling fluid density in under-balanced drilling of horizontal shale gas well.
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图 1 毛管力作用下井眼附近含水饱和度随时间和无因次径向距离的变化规律
Figure 1. Variation law of water saturation near borehole with time and dimensionless radial distance under capillary force
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图 2 不同欠压差值下钻井10 d后井眼附近含水饱和度随无因次径向距离的变化规律
Figure 2. Variation law of water saturation near borehole with dimensionless radial distance after 10 days of drilling under different under-pressure
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图 3 欠压差为0.5 MPa时页岩吸水后井眼附近岩石力学特性随无因次径向距离的变化规律
Figure 3. Variation law of rock mechanical properties near borehole with dimensionless radial distance after shale water absorption under-pressure difference 0.5 MPa
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图 5 井眼周围地层坍塌压力随无因次径向距离和井周角的变化规律
Figure 5. Variation law of formation collapse pressure equivalent drilling fluid density around borehole with dimensionless well radius and well round angle
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图 6 钻井10 d后不同欠压差下井眼附近地层坍塌压力随无因次径向距离的变化规律
Figure 6. Variation law of formation collapse density with radial distance near borehole under different under-pressure difference after 10 days of drilling
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图 7 不同欠压差下的最大井径扩大率
Figure 7. The maximum hole diameter enlargement rate under different under-pressure difference
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图 8 欠压差2 MPa条件下钻井10 d后渗透率对井眼附近地层坍塌压力的影响
Figure 8. Influence of permeability on formation collapse density near borehole after 10 days of drilling at under-pressure difference of 2 MPa
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图 9 欠压差2 MPa条件下钻井10 d后渗透率对最大井径扩大率的影响
Figure 9. Influence of permeability on maximum hole diameter enlargement rate after 10 days of drilling at under-pressure difference of 2 MPa
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图 10 欠压差为2 MPa下钻井10 d后孔隙度对坍塌压力的影响
Figure 10. Influence of porosity on collapse pressure after 10 days of drilling at under-pressure difference of 2 MPa
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图 11 不同孔隙度下的最大井径扩大率
Figure 11. The maximum hole diameter enlargement rate at different porosity
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图 12 欠压差2 MPa条件下钻井10 d后界面张力对坍塌压力的影响
Figure 12. Influence of surface tension on collapse pressure after 10 days of drilling at under-pressure difference of 2 MPa
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[1] 陈勉, 金衍, 张广清.石油工程岩石力学[M].北京:科学出版社, 2008:60-65. CHEN Mian, JIN Yan, ZHANG Guangqing.Petroleum rock mechanics[M].Beijing:Science Press, 2008:60-65.
[2] 黄亮.欠平衡钻井随钻不稳定渗流模型研究[D].成都: 西南石油大学, 2013. HUANG Liang.Under-balanced drilling with the drill ustable seepage model research[D].Chengdu: Southwest Petroleum University, 2013.
[3] YEW C H, CHENEVERT M E, WANG C L, et al.Wellbore stress distribution produced by moisture adsorption[J].SPE Drilling Engineering, 1990, 5(4):311-316. doi: 10.2118/19536-PA
[4] 王剑.泥页岩的水化稳定性研究[D].西安: 西安石油大学, 2012. WANG Jian.Clay shale hydration stability studies[D].Xi'an: Xi'an Shiyou University, 2012.
[5] 程远方, 张锋, 王京印, 等.泥页岩井壁坍塌周期分析[J].中国石油大学学报(自然科学版), 2007, 31(1):63-66, 71. doi: 10.3321/j.issn:1000-5870.2007.01.012 CHENG Yuanfang, ZHANG Feng, WANG Jingyin, et al.Analysis of borehole collapse cycling time for shale[J].Journal of China University of Petroleum(Edition of Natural Science), 2007, 31(1):63-66, 71. doi: 10.3321/j.issn:1000-5870.2007.01.012
[6] 刘厚彬.泥页岩井壁稳定性研究[D].成都: 西南石油大学, 2006. LIU Houbin.Study on borehole stability of shale[D].Chengdu: Southwest Petroleum University, 2006.
[7] YU Mengjiao, CHENEVERT M E, SHARMA M M.Chemical-mechanical wellbore instability model for shales:accounting for solute diffusion[J].Journal of Petroleum Science & Engineering, 2003, 38(3):131-143. http://www.sciencedirect.com/science/article/pii/S0920410503000275
[8] BALLARD T J, BEARE S P, LAWLESS T A.Fundamentals of shale stabilization:water transport through shales[J].SPE Formation Evaluation, 1994, 9(2):129-134. doi: 10.2118/24974-PA
[9] 沈建文, 屈展, 陈军斌, 等.溶质离子扩散条件下泥页岩力学与化学井眼稳定模型研究[J].石油钻探技术, 2006, 34(2):35-37. doi: 10.3969/j.issn.1001-0890.2006.02.010 SHEN Jianwen, QU Zhan, CHEN Junbin.A mechanical-chemical model for shale wellbore stability under solute diffusion[J].Petroleum Drilling Techniques, 2006, 34(2):35-37. doi: 10.3969/j.issn.1001-0890.2006.02.010
[10] 马天寿, 陈平, 王旭东, 等.页岩气储层井周孔隙压力传递数值分析方法[J].石油学报, 2016, 37(5):660-671. http://d.old.wanfangdata.com.cn/Periodical/syxb201605010 MA Tianshou, CHEN Ping, WANG Xudong, et al.Numerical analysis method of pore pressure propagation around the borehole for shale gas reservoirs[J].Acta Petrolei Sinica, 2016, 37(5):660-671. http://d.old.wanfangdata.com.cn/Periodical/syxb201605010
[11] 周庆凡, 杨国丰.致密油与页岩油的概念与应用[J].石油与天然气地质, 2012, 33(4):541-544. http://d.old.wanfangdata.com.cn/Periodical/syytrqdz201204007 ZHOU Qingfan, YANG Guofeng.Definition and application of tight oil and shale oil terms[J].Oil & Gas Geology, 2012, 33(4):541-544. http://d.old.wanfangdata.com.cn/Periodical/syytrqdz201204007
[12] 童姜楠.我国页岩油发展现状与展望[J].地下水, 2015, 37(2):207-208. doi: 10.3969/j.issn.1004-1184.2015.02.085 TONG Jiangnan. Development status and prospect of shale oil in China[J].Ground Water, 2015, 37(2):207-208. doi: 10.3969/j.issn.1004-1184.2015.02.085
[13] 付茜.中国页岩油勘探开发现状、挑战及前景[J].石油钻采工艺, 2015, 37(4):58-62. http://d.old.wanfangdata.com.cn/Periodical/syzcgy201504023 FU Qian.The status, challenge and prospect of shale oil exploration and development in China[J].Oil Drilling & Production Technology, 2015, 37(4):58-62. http://d.old.wanfangdata.com.cn/Periodical/syzcgy201504023
[14] 邹才能, 杨智, 崔景伟, 等.页岩油形成机制、地质特征及发展对策[J].石油勘探与开发, 2013, 40(1):14-26. http://d.old.wanfangdata.com.cn/Periodical/syktykf201301002 ZOU Caineng, YANG Zhi, CUI Jingwei, et al.Formation mechanism, geological characteristics and development strategy of nonmarine shale oil in China[J].Petroleum Exploration and Development, 2013, 40(1):14-26. http://d.old.wanfangdata.com.cn/Periodical/syktykf201301002
[15] 李皋, 孟英峰, 唐洪明, 等.砂岩气藏水基欠平衡钻井逆流自吸效应实验研究[J].天然气工业, 2007, 27(1):75-77. doi: 10.3321/j.issn:1000-0976.2007.01.022 LI Gao, MENG Yingfeng, TANG Hongming, et al.Laboratory study on backwash imbibition generated during WBM underbalanced drilling in sandstone gas reservoirs[J].Natural Gas Industry, 2007, 27(1):75-77. doi: 10.3321/j.issn:1000-0976.2007.01.022
[16] 徐加放, 邱正松.泥页岩水化-力学耦合模拟实验装置的研制[J].中国石油大学学报(自然科学版), 2006, 30(3):63-66. doi: 10.3321/j.issn:1000-5870.2006.03.014 XU Jiafang, QIU Zhengsong.Simulation test equipment of coupled hydra-mechanics of shales[J].Journal of China University of Petroleum(Edition of Natural Science), 2006, 30(3):63-66. doi: 10.3321/j.issn:1000-5870.2006.03.014
[17] 王滢, 唐洪明, 谢晓永, 等.致密砂岩气藏水基欠平衡钻井损害评价[J].天然气工业, 2008, 28(12):71-73. doi: 10.3787/j.issn.1000-0976.2008.12.020 WANG Ying, TANG Hongming, XIE Xiaoyong, et al.Evaluation on the damage degree of water-based under-balanced drilling technology applied in tight sandstone gas reservoirs[J].Natural Gas Industry, 2008, 28(12):71-73. doi: 10.3787/j.issn.1000-0976.2008.12.020
[18] van OORT E, HALE A H, MODY F K, et al.Transport in shales and the design of improved water-based shale drilling fluids[J].SPE Drilling & Completion, 1996, 11(3):137-146.
[19] 王萍, 屈展, 黄海.地层水矿化度对硬脆性泥页岩蠕变规律影响的试验研究[J].石油钻探技术, 2015, 43(5):63-68. doi: 10.11911/syztjs.201505011 WANG Ping, QU Zhan, HUANG Hai.Experimental study of the effect of formation water salinity on creep laws of the hard brittle shale[J].Petroleum Drilling Techniques, 2015, 43(5):63-68. doi: 10.11911/syztjs.201505011
[20] 毛惠, 邱正松, 黄维安, 等.温度和压力对黏土矿物水化膨胀特性的影响[J].石油钻探技术, 2013, 41(6):56-61. doi: 10.3969/j.issn.1001-0890.2013.06.011 MAO Hui, QIU Zhengsong, HUANG Weian, et al.The effects of temperature and pressure on the hydration swelling characteristics of clay mineral[J].Petroleum Drilling Techniques, 2013, 41(6):56-61. doi: 10.3969/j.issn.1001-0890.2013.06.011
[21] NASERI M, SINAYUC C.Numerical modeling of counter-current spontaneous imbibition during underbalanced drilling[R].SPE 152412, 2012.
[22] 肖绒, 何世明, 吕振虎.毛管力作用下的欠平衡钻井水侵规律研究[J].油气藏评价与开发, 2016, 6(1):50-55. doi: 10.3969/j.issn.2095-1426.2016.01.012 XIAO Rong, HE Shiming, LYU Zhenhu.Research of water invasion of underbalanced drilling under capillary force[J].Reservoir Evaluation and Development, 2016, 6(1):50-55. doi: 10.3969/j.issn.2095-1426.2016.01.012
[23] 李淑霞, 谷建伟.油藏数值模拟基础[M].东营:中国石油大学出版社, 2009:134-144. LI Shuxia, GU Jianwei.Reservoir numerical simulation basis[M].Dongying:China University of Petroleum Press, 2009:134-144.
[24] 蒋雨江.J函数平均毛管力三维三相渗流数值模拟研究[D].成都: 西南石油大学, 2014. JIANG Yujiang.Numerical simulation of three-phase three-dimensional flow considering average capillary pressure of J Function[D].Chengdu: Southwest Petroleum University, 2014.
[25] WONG R.Swelling and softening behaviour of La Biche shale[J].Revue Canadienne de Géotechnique, 1998, 35(2):206-221. doi: 10.1139/t97-087
[26] 黄荣樽, 陈勉, 邓金根, 等.泥页岩井壁稳定力学与化学的耦合研究[J].钻井液与完井液, 1995, 12(3):15-21. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK199500659969 HUANG Rongzun, CHEN Mian, DENG Jingen.Study on shale stability of wellbore by mechanics coupling with chemistry method[J].Drilling Fluid & Completion Fluid, 1995, 12(3):15-21. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK199500659969
[27] 刘向君, 罗平亚.岩石力学与石油工程[M].北京:石油工业出版社, 2004:118-120. LIU Xiangjun, LUO Pingya.Rock mechanics and petroleum engineering[M].Beijing:Petroleum Industry Press, 2004:118-120.
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