Oil Pump

Summary

 * The oil pump is unlocked at Area 72;
 * Its cost to build doubles every time and starts at 500,000 coins;
 * It will work both on- and offline (note: unconfirmed if offline will slow it down);
 * Oil can only be gathered in specific areas, they are marked with an oil drop icon, below the resources at the top (first oil area is 56);
 * Oil pumps require electricity to work, equal to their level; this means you will pump oil the most quickly per unit electricity with L1 pumps, then L3 pumps, then L2 pumps, in descending order of efficiency (i.e. L1s are best so long as you still have oil spots left to pump)
 * Because the sole purpose of the crude oil you pump is being refined into refined oil, which is extremely slow even with 8 Chemistry stations and 6 or 7 Drones boosting, you are unlikely to find yourself limited by pumping speed, in practice.
 * Their inventory needs to be claimed either manually or by a drone;
 * Oil pumps can be boosted for 12 hours for 5 gems.

As it is impossible to use more than 11 oil pumps, you should never build more than 11. As they all cost electricity, even building 11 is a very bad idea, as you have no way to permanently turn them off or delete them. Here are their initial build costs; add 1M for an L2 pump, and 2M for an L3 pump, but remember, you should not build those:
 * 1) 500K
 * 1M
 * 2M
 * 4M
 * 8M
 * 1) 16M
 * 2) 32M
 * 3) 64M
 * 4) 128M
 * 5) 256M
 * 6) 512M

In reality, the fastest rates at which you can consume crude oil are:
 * Each station makes its own oil: it produces 5 clean water, turns them into 10 hydrogen, then turns that into 1 refined oil. You log in manually to transition this, although you can do it in multiples to log in less often (e.g. 10/20/2, to log in half as often).  This means you produce 8 refined oil every 5*(10+15)+30=155 minutes, so you consume 80 crude in that time, which is slightly less than 31 per hour; 5 L1 Oil Pumps are sufficient to feed this while running an oil profit, allowing you to slack off on collecting your oil.
 * As you allocate more drones to boosting chemistry, you will need more crude oil production to sustain it; practically speaking, this caps at 5-7 drones, as you will always need a drone to collect mining resources, and you may need a drone collecting oil and/or water. Remembering that 5 L1 pumps will always run a crude surplus at 0 drones boosting, here are the most electrically efficient ways to produce oil for more drones boosting; all of them will run at least some surplus.  The value for 8 drones is included so you can see it, but remember, you should never do this, as your mines aren't producing anything if all of your drones are boosting chemistry.
 * 6 L1s.
 * 7 L1s.
 * 8 L1s.
 * 10 L1s.
 * 10 L1s, 1 L2.
 * 9 L1s, 2 L3s.
 * 7 L1s, 1 L2, 3 L3s.
 * 5 L1s, 1 L2, 5 L3s.