These guys http://www.conergy.us/DesktopDefault.aspx have a helical pump. The ekectronics are all above ground. Water bearings, stainless rotor in rubber, power is DC (designed for solar) and can be powered from an AC power supply.
I have one down 500 ft. Pumping from almost empty well and pressurizing a tank to 60 psi I have never seen it draw more than 500 watts and usually less.
I would guess it should not care about gas unless it is so plentiful and undisolved that it effectively makes the pump run "dry".