摘要
在油藏改建地下储气库时,为了研究不同初始含水饱和度对库容的影响,利用实际矿场岩心开展了不同初始含水饱和度条件下气驱油水多轮次注采实验,分析了不同初始含水饱和度下气驱油水后的驱替效率及建库效果。结果表明,低含水饱和度条件下,油相的相对渗透率显著高于水相而更易被驱替出,因此主要通过气驱油来提高储气空间;中、高含水饱和度时,水相更易被驱替出,储气空间的提高逐渐由被驱替出的原油体积贡献转向于由驱替出的水相体积贡献。相同注采轮次下,由于储层岩石水湿及渗吸作用,高初始含水饱和度时的剩余水饱和度增大,气驱油水总的驱替效率降低,储气库的注采能力和库容相对减小;储层初始含水饱和度增大会降低气驱油水的驱替效率,不利于提高原油采收率及储气库扩容;初始含水饱和度越高,储气库达容时间越久,建库初期的注采能力越低。该研究成果可为油藏型储气库注采能力评价和库容分析提供指导。
In order to study the effect of different initial water saturation on the storage capacity when the oil reservoir is reconstructed into a underground gas storage.The multi-round injection-production experiments of gas drive oil-water under different initial water saturation conditions were carried out by using the actual field core,and then analyzes the displacement efficiency and storage capacity after gas flooding oil and water under different initial water saturation conditions.The results show that under the condition of low water saturation,the relative permeability of the oil phase is significantly higher than that of the water phase and is more easily displaced,so the gas storage space is mainly improved through gas drive oil.When the water saturation is medium and high,the water phase is more easily to be displaced,and the increase of gas storage space gradually shifts from the volume contribution of displaced crude oil to the volume contribution of displaced water phase.Under the same injection-production cycles,due to the water-wet and imbibition of reservoir rock,the residual water saturation at high initial water saturation increases,the total displacement efficiency of gas-flooding oil-water decreases,so that the injection-production capacity and storage capacity of gas storage decrease relatively.The increase of initial water saturation of reservoir will reduce the total displacement efficiency of gas drive oil and water,which is not conducive to enhanced oil recovery and gas storage capacity expansion.The higher the initial water saturation is,the longer the gas storage capacity is,and the lower the injection-production capacity in the early stage of reservoir construction is.The research results can[JP2]provide guidance for injection-production capacity evaluation and storage capacity analysis of reservoir-type gas storage.[JP]
作者
丁洋洋
秦正山
何勇明
刘文龙
向祖平
程泽华
DING Yangyang;QIN Zhengshan;HE Yongming;LIU Wenlong;XIANG Zuping;CHENG Zehua(School of Energy,Chengdu University of Technology,Chengdu 610000,China;The 6th Oil Production Plant,PetroChina Changqing Oilfield Company,Xi’an 710000,China;College of Petroleum and Natural Gas Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;Bohai South Operation Company,Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin 300450,China)
出处
《非常规油气》
2024年第4期89-96,共8页
Unconventional Oil & Gas
基金
成都理工大学研究生拔尖创新人才培育项目“含水层储气库注采过程地层干化盐析损伤机理及数学模型研究”(CDUT2022BJCX005)。
关键词
枯竭油藏
储气库
含水饱和度
多轮次注采实验
驱替效率
储气空间
depleted oil reservoirs
gas storage
water saturation
multi-round injection-production experiments
displacement efficiency
storage capacity
