The last picture was of a "Well-House" that encloses the well and it's associated Power, controls, and instrumentation. There are several different types of wells:1) Producers that depend on the oil field being pressurized that Push the oil up to the surface.2) "WAG's", which is short for Water And Gas injection, that are well that Inject Water and/or Gas to keep the field pressurized, and 3) & 4) two types of wells that are dependant on some type of pump. The Electric ones, have a Deep-well submersable pump that range between 100 and 800 HP. These Submersable pumps are only about 8" in diameter and can be as long as 55 Feet. They operate at several thousand volts and may have some super haevi duty metal encased Heat Tape running a couple thousand feet down the well that heats the oil up to reduce it's viscosity. The other variety has high pressure water going down the well that powers a "JET" pump, the exhausted water being injected into the formation at a lower lever, then the water powered pump pushes the oil from a higher level back up. It's a sort of 'Pipe inside a Pipe' araingement. As Oil floats on water, one can essentially "float" the oil back up and out, while displacing it. The water usually comes from one of two STP's or Sea Water Treatment Plant's. These take sea water and completely distill it. It is normal to find water in with the oil in any formation, even one that has not been drilled previously. In order not to contaminate the formation, the water being processed out of the oil is analyzed, and the water being injected has all the minerals and chemicals added to it make it JUST LIKE THE WATER THEY WERE GETTING OUT.>
The Well houses sit on big 12 by 12 timbers and get lifted off by a small crane so that a Drill Rig can back on to the well and service it. Inside the well house are: Lights, a special 'Explosion Proof' Heater, guages, instuments, and some elaborate valves. Some of the valves are electric, some are Hydrolic powered. All the wiring and associated controls and instruments are Explosion Proof. Everything that is hapening at the well can be controlled and monitored from the control room at MPU. Wells often read up to 3000PSI on some of the guages. This would not be a good place to "Light-up". At some of the more remote sites, periodically the Opertors found Natives on Snow Mobiles sitting inside a well house smoking! Not a good idea when there might be 3000 PSI of Natural gas passing thru 4 inch pipes.