摘要
通过页岩页理缝的表征参数和双重介质模型的表征参数建立联系,将双重介质模型中的形状因子、等效孔隙度和等效渗透率通过页理缝密度和页理缝开度两个参数表征。并通过双重介质模型表征其页理缝高度发育的特点,建立多段压裂水平井双重介质模型。利用局部网格加密表征离散裂缝,改造区高压高含水饱和度模拟压后储层状态,进而模拟高密度页理页岩油藏压后返排阶段的生产动态,并总结该阶段动态特征。将建立的数值模型应用于大庆古龙页岩油藏A1井,进行模型验证,并分析页理缝参数、压裂裂缝参数和压裂液赋存模式对返排动态的影响。结果表明:页理缝密度的增加能够明显提高日产油量,但对日产水量的影响不大;页理缝开度增加日产油量均下降明显,初期日产水量有所上升;人工裂缝渗透率在一定程度内能够提高日产油量,增加人工裂缝半长,日产油量和日产水量均有明显上升;压裂液在改造区内的赋存模式对初期日产油量有较大影响,但是对稳产后的日产油量和日产水量影响较小。
In this paper,a dual medium model was adopted to describe the shale oil reservoirs with high density bedding fractures,in which the shape factor,equivalent porosity and permeability were characterized by two parameters,namely the density and the aperture of the bedding fractures.Subsequently,a multi-stage fracturing horizontal well dual medium model was established.In the model,local grid infill(LGR)was used to characterize the discrete fractures,and the state of post fracturing reservoir was simulated by high-pressure and high water saturation in the fractured area.The model was used simulate the production performance in the post fracturing flowback stage of the high-density shale reservoir,and it was verified using the field production data of well A1 in Daqing Gulong shale reservoir,in which the effects of bedding fracture parameters,hydraulic fracture parameters,and the occurrence state of the fracturing fluid on flowback performance were analyzed.The results show that the increase of the shale fracture density can significantly increase oil production,but it has little impact on water production.The daily oil production decreases significantly with the increase of the opening of the bedding seams,while the daily water production increases only at the initial stage.The permeability of the artificial fractures can greatly increase the daily oil production to a certain extent,and with the increase of the half length of artificial fractures,the daily oil production and water production also increase significantly.The occurrence state of the fracturing fluid in the fractured area has a great impact on the initial oil production,but has little impact on oil and water production after the production rate is stabilized.
作者
贾品
牛烺昱
柯贤哲
曹仁义
白玛罗宗
程林松
JIA Pin;NIU Langyu;KE Xianzhe;CAO Renyi;BAI Maluozong;CHENG Linsong(State Key Laboratory of Oil and Gas Resources and Exploration(China University of Petroleum(Beijing)),Beijing 102249,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;SINOPEC Tibet Petroleum Branch,Lhasa 850000,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第4期137-144,共8页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金青年科学基金项目(52004307)。
关键词
页岩油藏
高密度页理
返排与生产
数值模拟
动态特征
shale reservoir
high density bedding
flowback and production
numerical simulation
dynamic characteristics
