【作者】 于兰；

【导师】 邓宏文；

【作者基本信息】 中国地质大学（北京） ， 油气田开发工程， 2010， 硕士

【摘要】 本论文主要针对萨中开发区中区西部二次开发井网重构进行研究,依据萨中开发区精细地质研究结果,利用精细地震三维技术、高精度动态监测技术、精细油藏描述技术、储层结构精细刻画技术,搞清剩余油分布,重新构建地下认识体系。对中区西部基本概况:构造与断层、储层特征、流体性质、油藏温度与压力、油藏类型、区块地质储量进行了介绍,对开发历程、区块内各矿场试验研究状况及目前开发中存在的主要问题进行了总结,并对中区西部油藏沉积特征、油层发育状况、油层非均质性进行了精细描述。对现井网动用状况、剩余油分布特征及分布类型作了总结,二类油层剩余油类型及分布特征:一是井网控制不住型剩余油;二是注采不完善型剩余油;三是厚油层顶部剩余油。三类油层剩余油类型及分布特征:一是与河道砂呈镶边或搭桥形态的薄差层剩余油;二是井网控制不住型剩余油;三是注采不完善型剩余油。高台子油层剩余油类型及分布特征:一是分布在成片差油层区;二是层间干扰型剩余油;三是井网控制不住型剩余油;另外,还有少数因尖灭遮挡井网注采不完善形成的剩余油,但分布零散。在精细地质研究和数值模拟的基础上,确定二次开发调整对象、开发次序及调整方式。优选合理的井网部署方案,共部署三套开发井网,其中包括萨葡二类油层三次采油井网、三类油层“两三结合”井网和高台子油层加密调整井网,每套井网均利用现井网并进行优化重组,细分了开发层系。进行了井网适应性研究,确定了二次开发的井网井距设计标准:中区西部萨葡二类油层三元复合驱合理注采井距应为125m;中区西部萨葡三类油层“两三结合”井网注采井距应确定为100m左右较为合理;中区西部高台子油层加密井网注采井距应确定为100m左右较为合理,考虑到高台子油层加密要与老井网相适应,高台子油层加密调整井网井距也确定为106m左右。并对开发潜力及开发指标预测:增储潜力预测、注采压力系统及合理压力初步设计、开发指标初步预测。二次开发的核心是提高老油田采收率,并通过地质建模和数值模拟进行历史拟合、指标预测,提高可采储量和采收率均达到设计要求,二次开发井网重构是可行的,经济效益显著,可在萨中开发区相似区块进行推广。更多还原

【Abstract】 Based on findings of fine geology in Sa-Zhong Development Area, three-dimensional seismic technique, highly accurate dynamic monitoring techniques, fine reservoir description techniques, and fine reservoir structure description techniques, the paper aims at studying the secondary development of well pattern reconfiguration in Middle West of Sa-Zhong Development Area, in order to reveal remaining oil distribution and to reconstruct reservoir cognition.The paper not only gives a basic overview of the Midwest, such as structure and fault structure, reservoir characteristics, fluid properties, reservoir pressure and temperature, reservoir type and geolograph reserves, etc., it also sums up the exploitation course, the condition of research in each mine field, and the problems in the exploitation. Furthermore, the paper describes the sedimentary feature of the Midwest, the reservoir development, and oil heterogeneity.The paper introduces the producing condition of well pattern and the features and types of remaining oil distribution. Remaining oil distribution in class II reservoir: non-perforated well pattern; reservoir injection-production faultiness; the top of thick oil pay. Remaining oil distribution in class III reservoir: thin and poor reservoir in edging and bridging state with channel sand; non-perforated well pattern; reservoir injection-production faultiness. Remaining oil distribution in Gaotaizi oil layer: in poor layer; interlayer interference; non-perforated well pattern. Besides, some remaining oil exists because of the pinch-out sealing reservoir injection-production faultiness, but with loose scatter.On the basis of fine geology and numerical simulation, the paper provides the secondary development object, development order and regulating methods. After close selection of some proper deployment schemes, the paper gives three schemes of the development of well pattern: Sapu class II reservoir tertiary recovery well pattern, class III reservoir“the combination of class II and class III”well pattern, and Gaotaizi oil layer infilling adjustment well pattern. Each uses the present well pattern but optimizes and reorganizes it, and subdivides the straticulate exploration. The paper makes an adaptability study of well pattern, establishes standard for the secondary development of well pattern and well spacing: for ASP flooding in Sapu class II reservoir, producer-injector spacing is 125m; for“the combination of class II and class III”well pattern in Sapu class III reservoir, producer-injector spacing is about 100m; for Gaotaizi oil layer infilled well pattern, producer-injector spacing is about 100m. Since Gaotaizi oil layer infilled well pattern should be adaptable to old well pattern, its producer-injector spacing is set as 106m approximately.The paper also involves the study of development potential and index forecast: forecast for the potential in increasing the storage, predesign for injection-production pressure system and proper pressure, index preliminary forecasting.The focus of the secondary development is to improve the extraction ratio of old field. Through geological modeling and numerical simulation, the paper plans to make history matching and index forecast, in order to improve recoverable reserves and extraction ratio. The paper concludes that the secondary development of well pattern reconfiguration is practicable and can be spread in Sa-Zhong area because of its obvious economic benefit.更多还原