Table 4. Data Analysis for One of the Wells Located in the Southwest of Iran.

parameters	RPM	WOB	τ	SPP	ROP
unit	rpm	klb	klbf ft	psi	m/h
mean	112.4	6.3	4.0	721.7	5.7
std. deviation	21.7	3.5	3.1	232.5	2.9
variance	524.4	22.0	10.9	52,293.8	5.4
minimum	35.09	0.12	0.01	14.32	1.5
maximum	157.2	16.6	9.5	1101.7	32.8
skewness	–0.4	0.6	0.1	–1.6	3.2
kurtosis	–0.5	0.3	–1.3	1.3	18.8