一种新的阶梯水平井段轨道设计模型

A New Model of Trajectory Design of Stepped Horizontal Hole Sections

摘要:

对于开发有一定高度差的多个薄油层，阶梯水平井较普通的定向井和水平井,节约了钻井成本，提高了单井的开采效率。分析了现有的阶梯水平井的设计模型，采用恒工具面模型进行三维阶梯水平井的轨道设计，以上下靶点的井斜角和方位角作为已知量，造斜工具的造斜率和安装角作为控制因素，将过渡点的井斜角和方位角作为待求参数。所设计的三维井眼轨道，通过计算示例表明，可用于设计阶梯水平井段。

关键词:阶梯水平井;恒工具面;三维;安装角轨迹设计

Abstract:

Stepped horizontal hole section is applied to stack-up 2 or more continual thin reservoirs with certain different height, which has the advantages of saving drilling investment and improving the production efficiency of the single well compared with ordinary directional well and horizontal well. The design of 3D stepped horizontal well trajectory was made by the analysis on the existing design model of stepped horizontal well and by the use of the constant tool face model. The upper and lower targets’ drift angle and azimuth angle are taken as the known quantity, the build-up rate and installation angle of deflecting tools as control factors. In addition, the drift angle and azimuth angle of flex point are the parameters to be computed. It is shown by the calculation sample that the designed 3D hole trajectory can be used for the design of stepped horizontal hole section.

Key words:stepped horizontal well; constant tool face; three dimension; installation angle; trajectory design