Making Hole - How Oilwells are Drilled?

To drill a well, a specialized piece of equipment known as a drilling rig bores a hole through many layers of dirt and rock until it reaches the oil and gas reservoir where the oil is held. The size of the borehole differs from well to well, but is generally around 12.5 to 90 centimeters wide. To cut through this rock, the drill is pushed down by the weight of the piping above it. This piping is used to pump a thick fluid known as mud into the well. This mud assists in the drilling process by maintaining the pressure below ground in the well as well as by collecting debris created from the drilling and bringing it up to the surface. As the drill digs deeper sections of piping are attached to lengthen the well.
After the well is drilled it is completed and cased. The well casing is the lining that is inserted between the edge of the well and the well itself that helps to structurally support the well. In a closed hole well, concrete is poured into the space between the pipe and the borehole for stability and to prevent groundwater contamination from seepage. Once casing is complete, the top of the well is fixed with a production tree - a set of valves that controls the flow of oil out of the well and the pressure within the well.
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[@bibasmohan7224]

Very informative video

[@DevinJared]

Drill baby drill..