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Christmas tree 
Group of devices at the head of the producing well that regulate the flow of oil being extracted from the deposit.
pressure gauge
Device that measures the oil pressure inside the producing well.
flow bean
Calibrated opening of a flow line through which oil flows; it is used to limit the flow from a producing well.
pipeline
Steel piping that carries oil from the well to the refining facilities.
tubing valve
Device that regulates the flow of oil extracted from the well and carries it in flow lines, here toward an oil pipeline.
casing first string
First column of large-diameter tubes that are inserted into the producing well mainly to strengthen its walls.
tubing
Last column of small steel tubes to be inserted in the well; they are used to bring oil to the surface.
tubing head
Equipment to which oil production and extraction tubes and devices (Christmas tree, tubing) are attached.
master gate valve
Main device that regulates the flow of oil; it can completely shut off the outflow.
