摘要
目的目前,碳埋存技术主要有地质构造埋存、残余气体埋存、溶解埋存及矿物埋存,随着CO_(2)压裂相关技术的应用,有必要针对增能压裂后CO_(2)的埋存机理及其主控因素开展深入研究。方法通过正交实验法,基于影响裂缝内孔隙空间和导流能力的因素,研究支撑剂(石英砂和陶粒)在不同铺砂浓度(5.0 kg/m^(2)、7.5 kg/m^(2)和10.0 kg/m^(2))下施加闭合压力受不同返排率影响的裂缝滞留碳埋存的情况,分析不同因素对裂缝滞留碳埋存影响的最优值。结果CO_(2)埋存主要是超临界状态下的埋存,CO_(2)处于超临界状态时,埋存率在80%以上;随着地层压力下降,埋存率急速降低,在压力降至6 MPa时,埋存率仅剩40%左右。埋存率的影响因素由大到小依次为闭合压力>返排率>支撑剂类型>铺砂浓度。主控因素是闭合压力,随着闭合压力的增加,埋存率逐渐降低。结论解决了对CO_(2)增能压裂裂缝内CO_(2)滞留碳埋存认知不清的问题,明确了4种压裂裂缝相关参数对CO_(2)埋存的影响,在进行CO_(2)增能压裂相关设计时,可依据实验结果对埋存进行预测。
Objective At present,the carbon storage technology mainly consists of geological structure storage,residual gas storage,dissolution storage and mineral storage.With the application of CO_(2)fracturing related technologies,It is necessary to carry out in-depth research on the mechanism and main controlling factors of CO_(2)storage after energized fracturing.Methods According to the factors affecting the pore space and conductivity in fractures,the optimal values of the influence of different factors on fracture retention carbon storage were selected by proppant(quartz sand and ceramsite)under different sand spreading concentrations(5.0 kg/m^(2),7.5 kg/m^(2)and 10.0 kg/m^(2))and the effects of different factors on fracture retention carbon storage were analyzed by orthogonal experimental method.Results CO_(2)storage is mainly in the supercritical state;the storage rate of CO_(2)is more than 80%when in the supercritical state.The storage rate decreases rapidly as the formation pressure continues to decline,and the storage rate is only about 40%when the pressure drops to 6 MPa.The factors affecting the storage rate include closing pressure,flowback rate,proppant type,and sand spreading concentration,and the influencing order from large to small is closing pressure>flowback rate>proppant type>sand spreading concentration.The main controlling factor is the closing pressure,and the storage rate gradually decreases with the increase of the closing pressure.Conclusion The problem of unclear understanding of CO_(2)storage carbon in CO_(2)energized fracturing fractures was solved,and the influence of four fracturing fracture-related parameters on CO_(2)storage was clarified.While in the design of CO_(2)energized fracturing,CO_(2)storage can be predicted based on experimental results.
作者
惠波
赵博超
杨尚儒
周长静
马占国
肖元相
苏煜彬
章思鹏
赵金省
HUI Bo;ZHAO Bochao;YANG Shangru;ZHOU Changjing;MA Zhan'guo;XIAO Yuanxiang;SU Yubin;ZHANG Sipeng;ZHAO Jinsheng(Oil and Gas Technology Research Institute of PetroChina Changqing Oilfield Company,Xi'an,Shaanxi,China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi'an,Shaanxi,China;Natural Gas Evaluation Project Department of Changqing Oilfield Branch,Qingyang,Gansu,China;CNPC XIBU Drilling Engineering Company Limited,Urumqi,Xinjiang,China;School of Petroleum Engineering,Xi’an Shiyou University,Xi'an,Shaanxi,China)
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2024年第5期84-92,共9页
Chemical engineering of oil & gas
基金
国家自然科学基金“致密砂岩油藏CO_(2)吞吐多尺度流、固物性变化机理及对吞吐效果的影响”(52174031)
陕西省自然科学基础研究计划“致密砂岩油藏CO_(2)吞吐效果微纳尺度主控因素研究”(2021JM-411)
陕西高校青年创新团队。
