Onshore
Onshore production is economically
viable from a few tens of barrels a day
upwards. Oil and gas is produced from
several million wells world-wide. In
particular, a gas gathering network can
become very large, with production from
hundreds of wells, several hundred
kilometers/miles apart, feeding through a
gathering network into a processing plant.
The picture shows a well equipped with a
sucker rod pump (donkey pump) often
associated with onshore oil production.
However, as we shall see later, there are
many other ways of extracting oil from a
non-free flowing well
For the smallest reservoirs, oil is simply collected in a holding tank and collected at
regular intervals by tanker truck or railcar to be processed at a refinery.