Study on Method of Determining the Safe Operation Window of Drilling Fluid Density with Credibility in Deep Igneous Rock Strata

Table 2

Relationship between and sample number n.

n		n		n
3	0.849321800	8	1.395189816	13	1.420698795
4	1.273982782	9	1.422962345	14	1.420669671
5	1.698643675	10	1.416278786	15	1.420693321
6	1.336252561	11	1.420835443	16	1.420692226
7	1.445461208	12	1.420269570	≥17	1.420693101