Hostile wellbore environment. Any well bore that meets one of the following criteria:

(1) depth greater than 20,000 ft.\\
(2) pressure greater than 20,000 psi\\
(3) temperature greater than 325°F\\
(4) hole [[deviation]] greater than 50°\\
(5) H<sub>2</sub>S or gas-cut [[mud]]

Any one or a combination of these will severely affect or restrict the logging operations.