鱼骨状分支水平井井筒流动特征及影响因素分析

Wellbore flow characteristics and its influencing factors of fish-bone branch horizontal wells

张殿锋

Zhang Dianfeng

中国石油大学（华东）机电工程学院，山东 青岛 266580

College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China

应用不稳定渗流理论，得到了鱼骨状分支水平井的压力分布表达式。结合井筒压降模型，建立了鱼骨状多分支水平井油藏渗流的井筒-油藏耦合模型。以胜利油田某区块鱼骨状分支井为例，定量分析了分支点位置、分支夹角、分支长度及分支个数等4个井形参数对鱼骨状井筒流动特征的影响规律。计算结果表明，在分支异侧、非对称、分支点位置靠近主井筒两端、分支角度不小于30°、分支数不少于2支的条件下，鱼骨状水平井的主支单位长度流入剖面更加合理。

The pressure distribution expression of fish-bone branch horizontal wells is obtained using unsteady percolation theory. Combined with the wellbore pressure drop model, the wellbore coupling model of fish-bone branch horizontal wells is established. Taking the fish-bone branch horizontal wells in Shengli Oilfield as an example, the influences of the well shape parameters, such as the location of branches, the angle of branches, the length of branches and the number of branches, on the wellbore flow characteristics of fish-bone branch horizontal wells are analyzed. The results show that the inflow profile of branch horizontal well is much better when branches have different sides and asymmetry, branches locate at the ends of the main wellbore, the number of branches is not less than 2 and the angle of branches is less than 30°.

10.6056/dkyqt201206030