储气库井在注采过程中因注采压力过大可能诱发微粒运移,为此,选用储气库碳酸盐岩储层岩心制取人工裂缝岩心,分别开展了应力敏感实验、干燥岩心和含水岩心气体速敏实验、模拟储气库注采压力增加时干燥岩心和含水岩心的流动实验,测试了实验过程中岩心渗透率,并借助扫描电镜对模拟储气库注采压力增加时和应力敏感实验前后岩心的裂缝壁面进行检测,揭示储气库注采过程中微粒运移机理。实验表明:干燥岩心和含水岩心的速敏程度分别为中等偏弱—中等偏强和中等偏强—强,岩心应力敏感程度为弱—中等偏弱;模拟储气库注采压力增加时干燥岩心和含水岩心的平均渗透率损害率分别为77%和84%。研究认为,注采过程中的裂缝壁面的微粒在高速气流拖拽作用下发生拉张破坏和有效应力下岩石被破坏是微粒运移的重要诱发机制,含水情况下岩石强度弱化,会强化微粒运移。建议合理控制注采压力和减少流体进入储气库井,防止产生大量微粒,最终影响储气库的多尺度注采,同时对于合理控制储气库的注采压力具有借鉴意义。
Particle migration may be induced due to the excessive pressure during injection and production process in gas storage well.Carbonate reservoir core samples in gas storage were taken to prepare samples with artificial fractures. Stress sensitivity test and velocity sensitivity tests of dry and water-bearing samples were conducted to simulate the fluid flow in dry and water-bearing samples under an increase of gas storage injection production pressure,and the corresponding sample permeabilities were measured during the experiment.Scanning electron microscopy was used to detect the fracture surface before and after stress sensitivity experiment to reveal the particle migration mechanism of gas storage injection-production process.Experiment indicates that the velocity sensitivitiy of dry and water-bearing core samples are medium-weak to medium-strong and medium-strong to strong respectively.The corresponding stress sensitivity is weak to medium-weak.The average permeability loss ratios of dry and water-bearing core samples are 77% and 84% for the particle migration simulation with a increase of gas storage injection-production pressure.Research indicates that the major particle migration mechanisms include the tensile failure of particle on the fracture surface results from high velocity gas flow dragging and rock damage under effective stress in the injection-production process.The rock strength decreases under water condition,which will intensify particle migration.It is recommended to restrict injection-production pressure and reduce fluid flow into gas storage well to prevent the generation of particles an enhance the multi-scale injection-production efficiency of gas storage.This research could provide certain reference for the reasonable injection-production pressure maintenance.
[1] 崔传智,韦自健,刘力军,等.低矿化度水驱中的微粒运移机理及其开发效果[J].工程科学学报,2019,41(6):719-730.
CUI Chuanzhi,WEI Zijian,LIU Lijun,et al.Mechanism of fines migration in low salinity waterflooding and its development effect[J].Chinese Journal of Engineering,2019,41(6):719-730.
[2] GRUESBECK C,COLLINS R E.Entrainment and deposition of fine particles in porous media[J].Society of Petroleum Engineers Journal,1982,22(6):847-856.
[3] 刘浩伽,李彦龙,刘昌岭,等.水合物分解区地层砂粒启动运移临界流速计算模型[J].海洋地质与第四纪地质,2017,37(5):166-173.
LIU Haojia,LI Yanlong,LIU Changling,et al.Calculation model for critical velocity of sand movement in decomposed hydrate cemented sediment[J].Marine Geology & Quaternary Geology,2017,37(5):166-173.
[4] REZA H,PEYMAN P,ALI V,et al.Application of silica nanofluid to control initiation of fines migration[J].Petroleum Exploration and Development,2017,44(5):802-810.
[5] 吴建平,肖建洪,李鹏,等.微粒运移对砾石充填防砂效果影响研究[J].钻采工艺,2018,41(2):54-56.
WU Jianping,XIAO Jianhong,LI Peng,et al.Effects of particle migration on gravel packing sand control[J].Drilling & Production Technology,2018,41(2):54-56.
[6] MUECKE T W.Formation fines and factors controlling their movement in porous media[J].Journal of Petroleum Technology,1979,31(2):144-150.
[7] 兰林,康毅力,陈一健,等.储层应力敏感性评价实验方法与评价指标探讨[J].钻井液与完井液,2005,22(3):1-4.
LAN Lin,KANG Yili,CHEN Yijian,et al.Discussion on evaluation methods for stress sensitivities of low permeability and tight sandstone reservoirs[J].Drilling Fluid & Completion Fluid,2005,22(3):1-4.
[8] 曹青,赵靖舟,刘新杜,等.鄂尔多斯盆地东部致密砂岩气成藏物性界限的确定[J].石油学报,2013,34(6):1040-1048.
CAO Qing,ZHAO Jingzhou,LIU Xindu,et al.Determiantion of physical property limits for the gas accumulation in tight sand reservoirs in the eastern Ordors Basin[J].Acta Petrolei Sinica,2013,34(6):1040-1048.
[9] BANASIK K,Walling D E.Predicting sedimentgraphs for a small agriculture catchment[J].Hydrology Research,1996,27(4):275-294.
[10] CHEN C,PACKMAN A I,GAILLARD J F.Pore-scale analysis of permeability reduction resulting from colloid deposition[J].Geophysical Research Letters,2008,35(7):1-5.
[11] 戚隆溪,王柏懿.土壤侵蚀的流体力学机制(Ⅱ)——风蚀[J].力学进展,1996,26(1):41-55.
QI Longxi,WANG Boyi.Hydraulic mechanism of soil erosion(Ⅱ):wind erosion[J].Advances in Mechanics,1996,26(1):41-55.
[12] YANG X,WANG J,ZHU C,et al.Effect of wetting and drying cycles on microstructure of rock based on SEM[J].Environmental Earth Sciences,2019,78(6):183.
[13] GAILLAR J F,CHEN C,STONEDAHL S H,et al.Imaging of colloidal deposits in granular porous media by X-ray difference micro-tomography[J].Geophysical Research Letters,2007,34(18):1-5.
[14] CHEN M,KANG Y,LI X,et al.Investigation of multi-scale gas transport behavior in organic-rich shale[J].Journal of Natural Gas Science and Engineering,2016,36:1188-1198.
[15] WANG L,WANG S,ZHANG R,et al.Review of multi-scale and multi-physical simulation technologies for shale and tight gas reservoirs[J].Journal of Natural Gas Science and Engineering,2017,37:560-578.
辽公网安备 21110002000031号 辽ICP备18011648号-1
