This supervisor is also an arrogant, proud guy, but not that annoying, because at least he is likely to teach you something you never heard.

First thing that I learned is that the crane working in a gas site should have a 'positive shut-off button' to shut off the intake of its engine so as to prevent gas coming into the engine.

2st, prior to any kind of operation on the well, grab all the staff in the site, no matter who they are, and explain them briefly how this operation goes and how we react in case of emergency. the key point here is 'all staff'.

thirdly, the surface casing is not only for protecting the underground fresh water, but also for preventing gas kick because the fluid column in the surface casing can build up certain static pressure which can prevent gas kick in certain degrees.