中高渗透油藏水平井整体开发水平段设计方法

为了描述水平段长度与井网密度的关系和在水平段井筒中水力阻力与水平段长度及产油量的关系,建立了数学方程组,可用于研究从油藏流入到水平段流出过程中各参数对水平段长度及产油量的影响,并可用于优化水平段长度,计算单井控制面积和产油量。由于该方法在考虑供给半径影响因素的同时还考虑了水平井开发对采收率的影响,因此,相对更加合理。提出了以流入、流出一体化主方程的导数方程为0,求解原方程的极大值,是水平段长度计算的较好方法。利用生产压差与水平段长度成反比关系,确定合理生产压差,进而设计出合理的水平段长度。用该方法进行了实例计算。

Horizontal section design method for overall development of horizontal well with middle-high permeability reservoir

On the basis of the relationships of length of horizontal section with the well pattern density,the derivative equations for determining the impact of fluid flow resistance in horizontal section with the length of horizontal section and oil production were established. These equations can optimize the length of horizontal section and also calculate the reserves controlled by individual well. All kinds of parameters involved in the inflow and outflow process of horizontal section were analyzed. The new method is more reasonable since it also involves in the influence of drainage radius and recovery rate. The equation also shows that the production pressure drop is inversely proportional to the length of horizontal section. The computation cases were given in this paper.