| 5 | 0 | 1 |
| 下载次数 | 被引频次 | 阅读次数 |
通过三轴岩石力学渗流耦合实验，探究了扩容力学参数及渗透率演化规律，建立了扩容诱导微裂缝形态判断准则，定义了有效扩容半径评价扩容增渗效果，并以南海西部油田注水井为例开展扩容数值模拟研究，揭示了岩石扩容弹塑性变形特性及微裂缝发育规律并评价其扩容增渗效果。研究表明，Athabasca油砂和渤海疏松砂岩的剪胀潜力最高，南海西部低渗砂岩的剪胀潜力最低，饱和样品的剪胀潜力高于非饱和样品，温度对剪胀潜力的影响不大。根据抗拉强度、黏聚力和内摩擦角三者的关系及地应力状态，可快速判断海上砂岩扩容微裂缝类型。张性扩容体积应变较小，但其增渗效果优于剪切扩容。提出了剪胀诱导水的有效渗透率模型、损伤渗透率模型，定义了基于超孔隙压力、孔隙度(或体应变)、渗透率增幅和微裂缝发育区的(有效)扩容半径，针对海上低渗油田注水井开展微裂缝形态快速预测和全尺寸井眼数值模拟精细化评价，发现扩容后产生张剪复合微裂缝，有效扩容半径达到12.83 m。研究结果可为海上油田注水扩容技术提供基础理论支撑和施工设计指导。
Abstract：To reveal the elastic-plastic deformation characteristics of rock expansion and the development law of microcracks, and evaluate their expansion and permeability effects, this paper conducts triaxial rock mechanics seepage coupling experiments to explore the expansion mechanics parameters and permeability evolution law, establish expansion-induced microcrack morphology judgment criteria, define effective expansion radius to evaluate expansion and permeability effects, and conduct expansion numerical simulation research using injection wells in the west oilfield of South China Sea as an example. Research has shown that Athabasca oil sands and Bohai loose sandstones have the highest shear dilation potential. In contrast, low-permeability sandstones in the western South China Sea have the lowest shear dilation potential. Saturated samples have higher shear dilation potential than unsaturated samples, and temperature has little effect on shear dilation potential. Based on the relationship between tensile strength, cohesion, internal friction angle, and the state of stress, the type of expansion microcracks in offshore sandstone can be quickly determined. The volumetric strain of tensile expansion is smaller, but its permeability-increasing effect is better than that of shear expansion. The author proposes effective permeability models for water induced by shear dilation, damage permeability models, and permeability evolution models considering interface chemical enhancement. The(effective) dilation radius based on super pore pressure, porosity(or volumetric strain), permeability improvement, and microcrack development zone is defined. Rapid prediction of microcrack morphology and detailed evaluation of full-size wellbore numerical simulation are carried out for water injection wells in low-permeability offshore oil fields. It is found that after expansion, tension shear composite microcracks are generated, with an effective expansion radius of 12.83m. The research results can provide basic theoretical support and construction design guidance for water injection and expansion technology in offshore oil fields.
[1] 陈欢，于继飞，曹砚锋，等.海上疏松砂岩注水井扩容增注技术研究及应用[J].石油科学通报，2023,8(5):649-659.CHEN H,YU J F,CAO Y F,et al.Application and research into dilatation and injection enhancement technology for unconsolidated sandstone injectors in an offshore oilfield[J].Petroleum Science Bulletin,2023,8(5):649-659.
[2] XU B,WONG R C K.Coupled finite-element simulation of injection well testing in unconsolidated oil sands reservoir[J].International Journal for Numerical and Analytical Methods in Geomechanics,2013,37(18):3131-3149.
[3] 林伯韬.疏松砂岩储层微压裂机理与应用技术研究[J].石油科学通报，2021,6(2):209-227.LIN B T.Microfracturing mechanisms and techniques in unconsolidated sandstone formations[J].Petroleum Science Bulletin,2021,6(2):209-227.
[4] 孙林，徐斌，熊培祺，等.疏松砂岩储层油井岩石扩容增产技术及其应用[J].大庆石油地质与开发，2024,43(6):98-105.SUN L,XU B,XIONG P Q,et al.Rock dilation stimulation technique for production wells in unconsolidated sandstone reservoirs and its application[J].Petroleum Geology & Oilfield Development in Daqing,2024,43(6):98-105.
[5] ABBATE J P,BARBER C,ELLIOTT C J,et al.Establishing communication between well pairs in oil sands by dilation with steam or water circulation at elevated pressures:U.S.,8905132[P].2014-12-09.
[6] 石兰香，李秀峦，马德胜，等.快速均匀启动技术改善蒸汽辅助重力泄油预热效果[J].油气地质与采收率，2017,24(4):94-98.SHI L X,LI X L,MA D S,et al.Effect of fast and uniform start-up enhancement technology on preheating performance of SAGD[J].Petroleum Geology and Recovery Efficiency,2017,24(4):94-98.
[7] 孙林，徐斌，邹信波，等.海上油田电泵生产井储层岩石扩容增产实践[J].大庆石油地质与开发，2022,41(1):77-83.SUN L,XU B,ZHOU X B,et al.Practice of reservoir rock dilation to increase production in electric pump production wells in offshore oil fields[J].Petroleum Geology & Oilfield Development in Daqing,2022,41(1):77-83.
[8] WU S W,YUAN H,CHEN H,et al.Experimental and numerical investigations of low-permeability sandstone under water injection-induced dilation in west oilfield,South China Sea[J].Processes,2024,12(11):2393.
[9] 高彦芳，陈勉，林伯韬，等.温度对油砂力学性质的影响规律研究[J].岩石力学与工程学报，2018,37(11):2520-2535.GAO Y F,CHEN M,LIN B T,et al.Thermal influences on mechanical properties of oil sands[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(11):2520-2535.
[10] AGAR J G,MORGENSTERN N R,SCOTT J D.Shear strength and stress:Strain behaviour of Athabasca oil sand at elevated temperatures and pressures[J].Canadian Geotechnical Journal,1987,24(1):1-10.
[11] 高彦芳，陈勉，林伯韬，等.稠油油藏SAGD微压裂阶段储层压缩系数研究：以新疆风城陆相储层重1区齐古组为例[J].石油科学通报，2017,2(2):240-250.GAO Y F,CHEN M,LIN B T,et al.Study on compressibility during micro-fracturing in continental ultra-heavy oil sand reservoirs:Taking the Qigu Formation of Xinjiang Fengcheng Oilfield Z1 Block for instance[J].Petroleum Science Bulleti,2017,2(2):240-250.
[12] GAO Y F,CHEN M,PANG H W.Experimental investigations on elastoplastic deformation and permeability evolution of terrestrial Karamay oil sands at high temperatures and pressures[J].Journal of Petroleum Science and Engineering,2020,190:107124.
[13] YALE D P,MAYER T,WANG J L.Geomechanics of oil sands under injection [C]//The 44th US Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium.Salt Lake City UT:ARMA,2010:10-257.
[14] TORTIKE W S,FAROUQ ALI S M.Reservoir simulation integrated with geomechanics[J].Journal of Canadian Petroleum Technology,1993,32(5):28-37.
[15] TOUHIDI-BAGHINI A.Absolute permeability of McMurray formation oil sands at low confining stresses[D].Edmonton:University of Alberta,1998.
[16] 陈森，林伯韬，金衍，等.SAGD井微压裂储层渗透率变化规律研究[J].西南石油大学学报(自然科学版),2018,40(1):141-148.CHEN S,LIN B T,JIN Y,et al.Study on patterns of change in oil reserve permeability during microfracturing of SAGD wells[J].Journal of Southwest Petroleum University (Science & Technology Edition),2018,40(1):141-148.
[17] 高彦芳，任战利，姜海龙，等.考虑剪胀性和应变软化的油砂非线性弹性模型[J].地下空间与工程学报，2023,19(1):43-50.GAO Y F,REN Z L,JIANG H L,et al.A nonlinear elastic model for oil sands considering shear dilation and strain softening[J].Chinese Journal of Underground Space and Engineering,2023,19(1):43-50.
[18] GAO Y F,CHEN M,LIN B T,et al.An analytical model of hydraulic dilation area for Karamay oil sand reservoir under water injection in SAGD wells[J].Journal of Petroleum Science and Engineering,2019,179:1090-1101.
[19] 高彦芳，陈勉，林伯韬，等.SAGD井挤液扩容水力波及范围模型[J].新疆石油地质，2018,39(2):202-208.GAO Y F,CHEN M,LIN B T,et al.An analytical model for water swept area in SAGD wells[J].Xinjiang Petroleum Geology,2018,39(2):202-208.
[20] 何小东，张磊，黄勇，等.风城SAGD油砂微压裂扩容效果评价方法研究[J].新疆石油天然气，2017,13(3):29-32.HE X D,ZHANG L,HUANG Y,et al.Study on evaluation method of SAGD micro-fracturing expansion effect in Fengcheng oil sands[J].Xinjiang Oil & Gas,2017,13(3):29-32.
[21] 孙林，熊培祺，朱海涛，等.海上油田低渗储层岩石扩容低效原因及储层改造工艺[J].中国海上油气，2024,36(3):151-158.SUN L,XIONG P Q,ZHU H T,et al.Reason for the low efficiency of rock dilation in low-permeability reservoirs and reservoir stimulation technique in offshore oilfields[J].China Offshore Oil and Gas,2024,36(3):151-158.
[22] 刘成林，任杨，孙林，等.海上特低渗砂岩储层酸化增效技术研究与应用[J].石油机械，2022,50(9):117-124.LIU C L,REN Y,SUN L,et al.Research and application of acidizing technology in offshore ultra-low permeability sandstone reservoir[J].China Petroleum Machinery,2022,50(9):117-124.
[23] CHEN H,CAO Y F,YU J F,et al.Dilation potential analysis of low-permeability sandstone reservoir under water injection in the west oilfield of the South China Sea[J].Processes,2024,12(9):2015-2040.
基本信息:
DOI：10.16152/j.cnki.xdxbzr.2025-03-010
中图分类号:TE53
引用信息:
[1]高彦芳,李登科,陈欢等.海上油田注水井岩石扩容增注机理与应用[J].西北大学学报(自然科学版),2025,55(03):613-632.DOI:10.16152/j.cnki.xdxbzr.2025-03-010.
基金信息:
国家自然科学基金(52204048); 陕西省重点研发计划项目(2025CY-YBXM-164); 中海石油(中国)有限公司科研院所联合攻关项目(YSLH-SZ 01 2023)