鱼骨形水平井产能分析与效果对比  

Productivity Analysis and Effect Comparison for Pinnate Horizontal Wells

作　　者：许红林[1] 熊继有[1] 王彬 范志利 

机构地区：[1]油气藏地质及开发工程国家重点实验室西南石油大学,四川成都610500 [2]中海油研究总院,北京100027

出　　处：《特种油气藏》2014年第4期116-119,156,共4页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金项目"西部油气深井物理法随钻防漏堵漏研究"(90610013)

摘　　要：鱼骨形水平井作为提高单井产量和油藏采收率的新技术已得到较广泛应用,但因其井眼结构复杂,常规方法难以计算其产能。采用离散化思想建立了鱼骨形水平井油藏渗流和井筒管流稳态耦合流动半解析产能模型,分析了其井筒产能分布规律并对水平井、压裂水平井和等效鱼骨井产能进行了对比。研究表明:鱼骨形水平井主井筒两端泄油能力强,中间弱,侧钻点处局部最弱;分支井筒从跟端到趾端泄油能力逐渐增强。鱼骨形水平井单相油流IPR曲线与直井的两相流IPR曲线相似,其生产压差应控制在合理范围内;低渗透油藏采用鱼骨形水平井增大储层接触面积相比水平井压裂增产更具潜力。Pinnate horizontal wells have been widely used in enhancing single well production and recovery factor,but due to complex borehole structure,conventional method can not be used to calculate their productivity. Discretization was adopted to establish a semi- analytical productivity model of reservoir flow and stable coupling wellbore flow of pinnate horizontal wells,which was then used to analyze the productivity distribution of the wellbore,and compare the productivity of horizontal wells,fractured horizontal wells and pinnate wells. The research shows that pinnate horizontal wells have strong oil drainage at both ends of the main wellbore,weak oil drainage in the middle part and weakest oil drainage at sidetracking point; while multi- lateral wellbores have the drainage capacity increasing from heel to toe. The IPR curves of single oil phase flow of pinnate horizontal wells and that of two phase flow of vertical wells are similar,and the producing pressure difference shall be within reasonable range. For low permeability reservoirs,increasing exposure to the reservoir with pinnate horizontal wells is more promising than fracturing in enhancing production. This study is of great significance for getting a deep understanding on the drainage mechanism of pinnate horizontal wells and proper development of low permeability reservoirs.

关 键 词：鱼骨形水平井 产能 耦合模型 产能分析 效果对比 提高采收率 

分 类 号：TE355.6[石油与天然气工程—油气田开发工程]