摘要
斯伦贝谢公司研制的方位密度中子仪(ADN)能够实现井周16个方位扇区和四个象限成像数据采集以往在利用ADN仪器进行实时地层倾角计算中只考虑到钻头沿地层倾向钻进的情况,没有考虑非倾向钻进情况下地层倾角和倾斜方位角的计算问题,因而所计算出的倾角并非是地层的真倾角。为了得到地层相对于井眼的倾角和倾向,文中将带有地层界面信息的井段沿着钻柱轴向和垂直于钻柱轴向的两个平面内切开,得到地层界面与钻柱的相对角度关系,通过计算地层界面与钻柱轴向的夹角(θ1)和地层界面在钻柱横截面上与水平弦的夹角(θ2)就可以求出地层界面相对于井眼的倾角和倾向,再通过井斜角校正量计算就可以得到地层的真倾角和真倾向。实际应用表明,文中方法能准确地计算出水平井周围地层的产状数据。
Azimuth Density Neutron (ADN) tool developed by Schlumberger Oilfield Services can implement imaging data acquisition in 16 azimuth fans and 4 quarters around the well. Formerly, it only considered the situation that the drill-bit drills a-long the dip of formation and without considering the computational issue of dip angle and incline azimuth of formation in non-dip drilling condition when using ADN tool for real-time dip computation of formation, so the computed dip is not true dip of formation. In order to get the dip and trend of formation relative to borehole,the paper cuts the well segment with interface information of formation along and vertical to the plane of axial direction of drilling shaft, obtaining the angle relationship of formation's interface relative to drilling shaft,the dip and trend of formation's interface relative to borehole can be computed by computing the angle (θ1) between the formation's interface and axial direction of drilling shaft and angle (θ2) between the formation's interface on cross section of drilling shaft and horizontal chord,then the true dip and trend of formation can be obtained by computing the correction of well inclination. The practical application showed the approach presented by the paper can accurately compute the attitude data of formation around the horizontal well.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2007年第B08期76-78,140+9,共3页
Oil Geophysical Prospecting
关键词
随钻测井
方位密度成像
水平井
构造解释
地层产状
图像
logging while drilling, azimuth density imaging, horizontal well, structural interpretation, attitude of stratum,image
