subsurface team (geologist, geophysicist, petrophysicist, reservoir eng etc) station in office most of their time. hydrocarbon does not come out to the surface without having them. what the hell is oil coming from?? they play vital role in o&g business.

Ya. Pls drill wherever place you like

Agreed. It is all about integration of knowledge, skills and experiences across all disciplines be it client, contractor, fabricator, vendor, service company consultant and etc, upstream and downstream, subsurface, surface, office and field.

Engineer in office might not good to know how people in field doing installation, commissioning, maintenance works for example servicing rotor or whatever of the pumps, procedure to install and start up the pumps step by step. But maybe they good in design the pumps, determine type of pumps to be used (centrifugal, reciprocal, submersible, positive placement pumps??),calculate pump head, pumps control philosophy, pumps capacity considering overall plant requirement and arrangement, interfacing with piping, material, design and code of standard, environment and safety ??
I am not expecting all the people who do maintenance works in field, replace the pipe, flange, gasket, do insulation and etc to know how to calculate pressure loss across the pipe, pipe thickness and etc?

Well, this is very diverse industry. There are many areas to discover and learn.