考虑启动压力梯度计算直井-水平井联合布井时注采极限井距  

Calculation of the Critical Well Spacing in Combination Well Pattern of Horizontal and Vertical Wells Considering Start-up Pressure Gradient

作　　者：孔嫦娥[1] 胡嘉[1] 姚猛[2] 

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《辽宁化工》2013年第11期1334-1337,共4页Liaoning Chemical Industry

摘　　要：由于低渗透储层具有低孔、低渗特征,其孔隙结构异常复杂,表现出非达西渗流,存在启动压力梯度。水平井技术作为开发低渗透储层的有效技术之一,具有泄油面积大、单井产量高、穿透度大、储量动用程度高等优点。本文采用拟三维思想,利用积分法推导了水平井在水平面上的流函数和势函数。并针对低渗透储层存在启动压力梯度,计算直井-水平井联合布井时的极限井距,结合等产量一源一汇典型解,对比联合布井与纯直井布井时极限井距的差异。并得到不同水平井段长度下,极限井距与启动压力梯度之间的关系。经实例验证,此方法对直井-水平井联合布井确定合理井距开发低渗透储层具有一定的指导意义。The low permeable reservoir has unusually complex pore structure because of its low porosity and permeability. So the low permeable reservoir shows the non-Darcy flow, and has the start-up pressure gradient. The horizontal well technology is an effective way to develop low permeability reservoirs, as it has the large drain area, high production and penetration depth per well. In this paper, the pseudo-three-dimensional thinking was adopted to infer the stream fi,mction and potential function of horizontal wells in the horizontal plane by the integral method. Considering the start-up pressure gradient, the critical spacing in combination pattern of vertical-horizontal wells was calculated; the limit spacing of combination pattern and pure vertical well was compared by combining a typical solution of a source and a sink in the same production. The relationship between the critical spacing and the start-up pressure gradient under different length of horizontal section was gained. This method has important guiding significance for determining reasonable well spacing in the combination pattern of vertical and horizontal wells.

关 键 词：积分法 启动压力梯度 联合布井 极限井距 直井-水平井 

分 类 号：TE35[石油与天然气工程—油气田开发工程]