RE: Basic explanatory Casing video6 Jul 2023 21:44
A little more info for interested newbies:
Traditional boring
Conventional drilling for oil and gas begins using a drill bit with a large diameter, typically 20 to 30 inches (the oil industry uses the American/Imperial measurement system). Drilling continues until the well must be cased to stop the hole from caving in. At this point the drill bit is removed and a steel pipe, known as a casing, is run into the hole. The pipe is smaller than the hole in order to leave space between the casing and the rock around the borehole. This ensures that the pipe does not get stuck while being put in place.
Once the pipe is in position, the gap, known as the annulus, is filled with cement. This is to give structural support to the well, and to isolate the different zones of rock, water and gas. Drilling continues using a smaller drill bit that fits inside the first casing. Eventually, the bit again reaches an unstable depth. The drilling team has to repeat the procedure, this time running a smaller pipe inside the first pipe and repeating the cementing process.
This sequence of drill, run and cement continues with an ever-decreasing diameter size of drill and pipe until the rig reaches the required depth. At this point, the rig team runs a completion tubing so that production can begin. After all this, a conventional well looks, in cross section, like a giant telescope in reverse that begins large in size and finishes small. Any size up to a 26-inch drill can be used at the top, yet at the bottom the casing that reaches the goal may only be 5 inches wide
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