如图,第一个轨迹比第二个测深长17米,第二个的造斜段比第一个多40m;第一个的DDI为5.85,第二个的DDI为6.49。另参考数据,请问你会选择哪个轨迹?
第一个轨迹
第二个轨迹
另附DDI的衡量标准:
Directional Difficulty Index (DDI)
Display only. This is an empirical method for assessing the complexity of a directional well before and after it has been drilled.
The DDI values may indicate the complexity of the well based on the following guidelines.
Calculated DDI Well Type
< 6.0 Simple profile with low tortuosity
6.0 to 6.4 Regular well with normal tortuosity
6.4 to 6.8 Longer well with relatively tortuous path
> 6.8 Long tortuous well profile with high degree of difficulty
The DDI is calculated using:
DDI = log10[(MD)(AHD)(T)/TVD]
Where:
MD = measured depth
AHD = the horizontal distance measured along the wellpath
T = the planned or actual accumulated dogleg for the survey divided by the total measured depth
TVD = true vertical depth
[ 此帖被扭纹柴在2010-03-19 13:04重新编辑 ]