基于损伤理论的硬脆性泥页岩井壁稳定分析
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摘要
硬脆性泥页岩地层的失稳破坏机理是非常规油气开发工作者的重点研究对象之一。从硬脆性泥页岩微裂缝的角度出发,将微裂缝视为硬脆性泥页岩的损伤,通过随机函数确定微裂缝的分布,将损伤力学和断裂力学相结合建立了硬脆性泥页岩的损伤本构模型。利用FLAC3D软件将硬脆性泥页岩的损伤破坏模型应用到井壁稳定分析中,并通过计算结果分析了钻井液、微裂缝形态等在硬脆性泥页岩破坏中占有的比重。计算结果显示,硬脆性泥页岩对钻井液的敏感度以及硬脆性泥页岩微裂缝的发育程度对井壁稳定影响最大,硬脆性泥页岩微裂缝的方向对井壁稳定影响很小。因此,钻井液的封堵性和密度是确保硬脆性泥页岩稳定的重要手段,控制钻井方向对维持硬脆性泥页岩稳定的作用有限。
The failure mechanism of the hard brittle shale formation is the key research object to ensure the safety development of unconventional oil and gas. From the perspective of microcracks in hard brittle shale,the microcracks was regarded as damage,the distribution of microcracks was determined by random function,and the damage constitutive model of hard brittle shale was established by combining damage mechanics and fracture mechanics. FLAC3 D software was used in borehole stability analysis with damage model of hard brittle shale. The role of drilling fluid and microcracks morphology in the failure of hard brittle shale was analyzed. The results show that the sensitivity of hard brittle shale to drilling fluid and the development degree of microcracks in hard brittle shale have great impact on the stability of borehole,while the direction of microcracks in hard brittle shale has little impact on the stability of borehole. The plugging and density of drilling fluid is an important means to ensure the stability of hard brittle shale,and the control of drilling direction has limited effect on maintaining the stability of hard brittle shale.
The failure mechanism of the hard brittle shale formation is the key research object to ensure the safety development of unconventional oil and gas. From the perspective of microcracks in hard brittle shale,the microcracks was regarded as damage,the distribution of microcracks was determined by random function,and the damage constitutive model of hard brittle shale was established by combining damage mechanics and fracture mechanics. FLAC3 D software was used in borehole stability analysis with damage model of hard brittle shale. The role of drilling fluid and microcracks morphology in the failure of hard brittle shale was analyzed. The results show that the sensitivity of hard brittle shale to drilling fluid and the development degree of microcracks in hard brittle shale have great impact on the stability of borehole,while the direction of microcracks in hard brittle shale has little impact on the stability of borehole. The plugging and density of drilling fluid is an important means to ensure the stability of hard brittle shale,and the control of drilling direction has limited effect on maintaining the stability of hard brittle shale.
引文
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18 Kachanov M.A continuum model of medium with cracks[J].Journal of the Engineering Mechanics Division,1980,106:1039-1051
19 Li G P.Microscopic damage mechanics model of rock under tensile load[J].Rock and Soil Mechanics,1995,16(1):54-62
20王正良,佘跃惠,李淑廉,等.含水量对硬脆性泥页岩稳定性的影响[J].钻井液与完井液,1995(6):7-9Wang Zhengliang,She Yuehui,Li Shulian,et al.The influence of water content on the stability of hard brittle shale[J].Drilling Fluid&Completion Fluid,1995(6):7-9
21 Chiarelli A,Shao J,Hoteit N.Modeling of elastoplastic damage behavior of a claystone[J].International Journal of Plasticity,2003,19(1):23-45
22李清,郭洋,田策,等.不同角度裂纹缺陷对材料动态断裂行为的影响[J].科学技术与工程,2016,16(28):1-5Li Qing,Guo Yang,Tian Ce,et al.Effect of material crack flaws on dynamic fracture behavior[J].Science Technology and Engineering,2016,16(28):1-5
2 Wang J H,Yan J N,Su S L.A new method for evaluating borehole stability of hard brittle shale[J].Oil Drilling&Production Technology,2006,28(2):28-30
3 Zhang S,Sheng J,Qiu Z.Maintaining shale stability using polyether amine while preventing polyether amine intercalation[J].Applied Clay Science.2016,132-133:635-640
4 Ghassemi A,Diek A.Linear chemo-poroelasticity for swelling shales:Theory and application[J].Journal of Petroleum Science and Engineering,2003,38(3-4):199-212
5 Dokhani V,Yu M,Takach N,et al.The role of moisture adsorption in wellbore stability of shale formations:mechanism and modeling[J].Journal of Natural Gas Science and Engineering,2015,27:168-177
6 Aadnoy B,Chenevert M.Stability of highly inclined boreholes[J].Society of Petroleum Engineers Drilling Engineering,1987,2(4):364-374
7 Chenevert M.Shale control with balanced-activity oil-continuous muds[J].Journal of Petroleum Technology,1970,22(10):1309-1316
8 Kanfar M,Chen Z,Rahman S.Analyzing wellbore stability in chemically-active anisotropic formations under thermal,hydraulic,mechanical and chemical loadings[J].Journal of Natural Gas Science and Engineering,2017,41:93-111
9 Ma T,Chen P.A wellbore stability analysis model with chemical-mechanical coupling for shale gas reservoirs[J].Journal of Natural Gas Science and Engineering,2015,26:72-98
10伍坤宇,张廷山,杨洋,等.昭通示范区黄金坝气田五峰-龙马溪组页岩气储层地质特征[J].中国地质,2016,43(1):275-287Wu Kunyu,Zhang Tingshan,Yang Yang,et al.Geological characteristics of Wufeng-Longmaxi shale gas reservoir in the Huangjinba gas field,Zhaotong National Shale Gas Demonstration Area[J].Geology in China,2016,43(1):275-287
11郗兆栋,田忠斌,唐书恒.鄂尔多斯盆地东缘海陆过渡相页岩气储层孔隙特征及影响因素[J].中国地质,2016,43(6):2059-2069Xi Zhaodong,Tian Zhongbin,Tang Shuheng.Characteristics and main controlling factors of shale gas reservoirs in transitional facies on the eastern margin of Ordos Basin[J].Geology in China,2016,43(6):2059-2069
12 Yuan J L,Deng J G,Yu B H.Study on borehole stability of horizontal well in shale gas reservoir[J].Natural Gas Industry,2012,32(9):66-70
13 Yu B H,Deng J G,Yan W.Study on control method of wellbore collapse in stratified shale formation[J].Oil Drilling Technology,2010(1):56-59
14 Zou C,Dong D,Wang S,et al.Geological characteristics,formation mechanism and resource potential of shale gas in China[J].Petroleum Exploration and Development,2010,37(6):641-653
15刘志远,陈勉,金衍,等.多弱面地层水平井裸眼井壁垮塌量计算模型[J].石油勘探与开发,2014,41(1):102-107Liu Zhiyuan,Chen Mian,Jin Yan,et al.Calculation model for bore-hole collapse volume of a horizontal open hole in multiple-weak plane formation[J].Petroleum Exploration and Development,2014,41(1):102-107
16陈平,马天寿,夏宏泉.含多组弱面的页岩水平井坍塌失稳预测模型[J].天然气工业,2014,34(12):87-93Chen Ping,Ma Tianshou,Xia Hongquan.A collapse pressure prediction model of horizontal shale gas wells with multiple weak planes[J].Natural Gas Industry,2014,34(12):87-93
17 Nguyen V,Abousleiman Y,Mody F K.Poromechanics modeling of wellbore stability in naturally fractured formations[C]//SPE Technical Conference&Exhibition.Houston,USA:Society of Petroleum Engineers,2004:1-8
18 Kachanov M.A continuum model of medium with cracks[J].Journal of the Engineering Mechanics Division,1980,106:1039-1051
19 Li G P.Microscopic damage mechanics model of rock under tensile load[J].Rock and Soil Mechanics,1995,16(1):54-62
20王正良,佘跃惠,李淑廉,等.含水量对硬脆性泥页岩稳定性的影响[J].钻井液与完井液,1995(6):7-9Wang Zhengliang,She Yuehui,Li Shulian,et al.The influence of water content on the stability of hard brittle shale[J].Drilling Fluid&Completion Fluid,1995(6):7-9
21 Chiarelli A,Shao J,Hoteit N.Modeling of elastoplastic damage behavior of a claystone[J].International Journal of Plasticity,2003,19(1):23-45
22李清,郭洋,田策,等.不同角度裂纹缺陷对材料动态断裂行为的影响[J].科学技术与工程,2016,16(28):1-5Li Qing,Guo Yang,Tian Ce,et al.Effect of material crack flaws on dynamic fracture behavior[J].Science Technology and Engineering,2016,16(28):1-5