致密砂岩油藏水平井低摩阻导向钻具组合优选

发布时间：2017-12-31 08:36

本文关键词：致密砂岩油藏水平井低摩阻导向钻具组合优选　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,随着优质石油资源的日益短缺,致密砂岩油藏已成为鄂尔多斯盆地石油资源的重要组成部分。实践表明,水平井开采致密砂岩油藏能够大幅度提高产量和采收率,达到明显的增产效果。但水平井具有井眼弯曲和井斜角大等特征,使用常规钻具组合时钻具的摩阻问题尤为突出,易发生钻具屈曲、托压效应和井眼不清洁等井下复杂情况,给水平井钻井施工带来巨大的经济损失。因此,优选低摩阻导向钻具组合对于致密砂岩油藏水平井钻井具有重要的意义。本文在调研致密砂岩油藏水平井导向钻具组合应用的基础上,确定了导向钻具组合优选的内容。通过对比刚杆模型和软杆模型的特点及适用性,确定了钻具摩阻预测模型的优选方法。鉴于常规低摩阻钻具组合优选方法的弊端,建立了一种改进的低摩阻导向钻具组合优选方法。以延长油田致密砂岩油藏的一口水平井为例,确定了实例井钻具摩阻预测模型并优选出了实例井第一造斜段、稳斜段、第二造斜段和水平段的低摩阻导向钻具组合,并使用Wellplan-Torque/Drag校核了各井段优选出钻具组合的强度。最后,分别分析了加重钻杆的位置与数量、螺杆钻具的尺寸、起下钻速度、钻压和钻进方式对钻具摩阻的影响,并优选出了设计井各井段的屈曲临界起下钻速度和屈曲临界钻压。
[Abstract]:In recent years, with the growing shortage of high-quality oil resources, tight sandstone reservoir has become an important part of petroleum resources Erdos basin. Practice shows that horizontal well in exploitation of tight sandstone reservoir can greatly improve the yield and recovery, to achieve significant yield increasing effect. But the horizontal well borehole bending angle of the well and has the features of large, use when the friction problem of conventional BHA drilling tool is particularly prominent, prone to buckling, pressure effect and borehole cleaning and other complicated downhole conditions, bring huge economic losses to the horizontal well drilling. Therefore, optimization of the low friction guide BHA has important significance for drilling horizontal wells in tight sandstone reservoir in this paper. The research orientation of tight sandstone reservoirs in horizontal well drilling assembly application, determine the guide BHA preferred content. By comparing the rigid model and flexible model The characteristics and applicability, determine the preferred method of model prediction of drill string friction. In view of the shortcomings of conventional low friction BHA optimization method, we proposed an improved low friction guide BHA optimization method. In order to extend the tight sandstone reservoir oil wells as an example, the example of wells drilling friction drag prediction model and the selection of the first instance well whipstocking section, steady inclined section, low friction guide BHA second inclined section and horizontal section, and use Wellplan-Torque/Drag to check every section of the well selected BHA strength. Finally, analyzed the location and quantity of aggravated drill pipe and screw drill size drill, drilling pressure and drilling speed, the influence on the friction factor, and optimized the design of each section of the well drilling speed and critical buckling critical drilling pressure.

【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE921

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