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305 ft water well. 20 ft casing, 300 ft liner............................................................$3,892.00. 405 ft water well. 20 ft casing, 400 ft liner............................................................$5,117.00. *a well liner is optional but is recommended for most wells.
Casing Programs. Sometimes the well is drilled in stages called a casing program. Here, a well is drilled to a certain depth, cased and cemented, and then the well is drilled to a deeper depth, cased and cemented again, and so on. Each time the well is cased, a smaller diameter casing is used. Casing program Source: Schlumberger. The widest type of casing is called conductor pipe, and it usually is about 30 to 42 inches in diameter for offshore wells and 16 inches in diameter for onshore wells. The next size in casing string is the surface casing, which can run several thousand feet in length.