分支水平井排水采油中排水量的确定方法  

The method of determining the displacement during the process of oil production with water drainage in the multilateral wells

作　　者：汤小龙[1] 彭小龙[1] 邓钰三[1] 王可可[1] 

机构地区：[1]西南石油大学油气藏地质与开发工程国家重点实验室,四川成都610500

出　　处：《油气藏评价与开发》2013年第1期19-21,26,共4页Petroleum Reservoir Evaluation and Development

摘　　要：为了控制强底水薄层油藏中水平井的含水率,常常采用分支井排水方法。研究发现该方法要取得明显的控水效果就需要确定合理的排水量,由于目前没有相关的理论公式,为此进行了研究。首先假设地层为均质,考虑油水两相,油水渗流满足达西定律,忽略流体的压缩性;假设底水为无限大水体,采油井位于油水界面上部,排水井位于油水界面下部,建立渗流微分方程。根据瞬时点源解和叠加原理,分别求解出采油井和排水井的产量公式,从而进一步反求得到采油井和排水井生产时所需的压差,根据压差与油水界面的平衡关系推导出排水量与排水井距离油水界面的位置之间的函数关系,从而得到最优的排水量求解公式。该公式表明,顶部分支井的产油量、油水流度比以及油水界面的位置是影响最优排水量的主要因素。Drainage of lateral wells to extract oil are generally used to control high water cut of horizontal wells in thin bottom water reservoirs. The key of acquiring the obvious water controlling effects is to determine reasonable displacement. Since there was no re- lated theoretical equation, this paper researched on it. Firstly, it was hypothesised that formations were homogeneous, oil and water percolation satisfied Darcy＇ s considering oil-water two phase, and fluid compressibility was ignored. Secondly, it was hypothesised that bottom water was an infinite body of water, producing wells were located in the upper part of WOC, drain wells were located in the lower part of WOC. Then percolation differential equation was established. Thirdly, according to instantaneous point source so- lution and superposition principle, which could resolve the production formula of producing wells and drain wells separately. Thus further reverse obtained the pressure difference of producing wells and drain wells through. At last, based on the pressure differ- ence and WOC balance relationship deduced function relations between displacement and the distance from drain wells to WOC, so as to get optimal displacement solution formula. The equation showed that the main factors that affect the optimal displacement are the oil production of multilateral wells, oil-water mobility ratio and the position of WOC.

关 键 词：底水油藏 分支水平井 排水采油 排水量 

分 类 号：TE355.6[石油与天然气工程—油气田开发工程]