摘要
在现有的最近井距扫描算法中,只考虑了最近距离点唯一的情况,无法处理最近距离点为多个乃至无穷的情况。在比较井圆弧井段上利用圆弧的垂向轴线建立了局部直角坐标系,使用初等几何方法给出了计算点到圆弧井段的最近距离点的新方法,涵盖了点与圆弧之间的位置关系的全部五种可能的情况。求出了整体坐标系到局部坐标系的变换矩阵。分析了点与稳斜井段之间的三种位置关系,给出了点到稳斜井段的最近距离的计算公式。新方法揭示了点到圆弧井段的最近距离点可能不是唯一的;在某些情况下,最近距离点有两个或者无穷多个。分析了经典的最近距离扫描图的缺点,用实例证明了经典绘图方法丢失了井深信息,提出了一种新的最近距离扫描图的绘图方法。本文方法适用于比较井为实钻轨迹或者圆弧型设计轨迹的邻井最近距离计算。
The unique nearest distance is considered for the present scanning algorithm of the nearest well spacing.So the method can't solve the problem of several or infinite nearest distance points.At the arc intervals of the comparative wells,partial arithmetic coordinate is built by using the vertical axis of the arc.New method of the nearest distance point at the arc intervals from the calculated point is given based on the primary geometry method,which includes five possible position relationships between the point and the arc.Transformation matrix is solved from entire arithmetic coordinate to partial arithmetic coordinate.Three position relationships between the point and the interval with maintain angle are analyzed,and the computing formula of the nearest distance between them is given.New method tells us the nearest distance point between the point and arc interval is not unique possibly;and there are two or infinite nearest distance points at certain conditions.Shortcoming of the classic scintigram of the nearest distance is analyzed,that is,well depth information may be lost when using the classic method by illustration.And a new method for mapping the scintigram of the nearest distance is proposed.It fits for the nearest distance calculation in the comparative wells that are the neighboring wells with in-drilling trackway or arc-designed trackway.
出处
《中外能源》
CAS
2012年第5期64-68,共5页
Sino-Global Energy
关键词
最近井距
井眼轨道
钻井设计
计算方法
中靶分析
the nearest well spacing
wellbore track
well drilling design
computing method
targeting analysis
