基于特低渗透油藏砂体内部建筑结构的水平井气驱效果评价

发布时间：2018-04-10 02:04

本文选题：特低渗透　切入点：精细构型　出处：《东北石油大学》2017年硕士论文

【摘要】：油气田合理开发开采是石油行业一项非常重要的工作。将低渗透储层的储层评价方法应用到特低渗透储层评价中存在明显的不适应性。由砂体内部建筑结构、剩余油分布模式认识不清导致的注水、注气等开发方案收效不明显,此现象在特低渗透油藏开发区是非常常见的问题。因此,研究以该类储层砂体内部建筑结构及剩余油分布模式为基础的水平井气驱开发方案是十分必要的。东141区块为典型的特低渗透油藏。依据东141区块地质条件,建立测井相模式,通过平面组合技术分析研究区沉积相特征,总结出研究区主力层段的沉积模式主要为曲流河相。以东141区块YI6-YI7砂层组为研究对象,开展了曲流河点坝砂体内部建筑结构精细解剖研究,明确了研究区点坝砂体内部夹层的倾向、倾角、平面分布及夹层密度等参数。根据点坝砂体内部构型参数,利用petrel软件建立高精度的三维地质模型,并根据油藏构型特征、水平井取心资料和油田生产数据总结研究区主力油层剩余油的三种分布模式。以此为基础利用Eclipse软件完成研究区水驱历史拟合,进一步修正三维地质模型,建立数值模拟初始参数场。针对研究区前期水平井注CO_2驱突破快的问题,设计了不同的CO_2气驱方案,并利用数值模拟理论完成方案模拟。依据研究区3 口水平井、3 口直井联合井网,以CO_2泡沫驱替的方式,日注气总量为150t,保证注采比为1.3:1,注气年限为5年,5年后改为水驱,直至含水量达到99%,该方案采收率相较于单纯水驱方案提高12.2%,为研究区下一步CO_2驱开发方案设计和实施提供有力支持。
[Abstract]:Rational development and exploitation of oil and gas fields is a very important work in petroleum industry.There is obvious inadaptability in the application of the reservoir evaluation method of low permeability reservoir to the evaluation of ultra-low permeability reservoir.Due to the construction structure of sand body and the unclear understanding of residual oil distribution pattern, the development schemes such as water injection and gas injection are not effective, which is a very common problem in the development zone of ultra-low permeability reservoirs.Therefore, it is necessary to study the gas drive development scheme of horizontal wells based on the building structure and residual oil distribution model in the sand body of this kind of reservoir.Block 141 is a typical low permeability reservoir.According to the geological conditions of East 141 block, the logging facies model was established, and the sedimentary facies characteristics of the study area were analyzed by plane combination technique, and the sedimentary model of the main formation in the study area was summarized as meandering river facies.The fine anatomical study on the structure of the sand body of the meandering river point dam was carried out in the YI6-YI7 sand formation of block 141 east of the east of the study area. The parameters of the intercalation such as inclination angle plane distribution and intercalation density were determined in the sand body of the point dam in the study area.According to the configuration parameters of point dam sand body, a high precision 3D geological model is established by using petrel software. According to reservoir configuration characteristics, horizontal well coring data and oilfield production data, three distribution models of remaining oil in main reservoir in the study area are summarized.On this basis, Eclipse software is used to complete the historical fitting of water flooding in the study area, and the 3D geological model is further revised, and the initial parameter field of numerical simulation is established.Aiming at the problem of fast breakthrough of CO_2 flooding in horizontal wells in the early stage of the study area, different CO_2 gas drive schemes are designed and simulated by numerical simulation theory.According to the combined well pattern of 3 horizontal wells and 3 straight wells in the study area, the total amount of gas injection per day is 150 t, the guaranteed injection-production ratio is 1.3: 1, the gas injection life is 5 years, and the injection time is changed to water drive after 5 years by CO_2 foam displacement, the total amount of gas injection per day is 150 t, and the guaranteed injection-production ratio is 1.3: 1.Until the water content reaches 99%, the oil recovery of this scheme can be increased by 12.2than that of the pure water drive scheme, which can provide strong support for the design and implementation of the next CO_2 flooding development scheme in the study area.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.7

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