Bulletin of the United States Geological Survey--Oil Fields of the Texas-Louisiana Gulf Coastal Plain . Fig. 12.—Derrick with machinery in place. The work progresses rapidly at first, but becomes slower as the drillgoes downward. Great care is required to keep the drill in motion U. S. GEOLOGICAL SURVEV BULLETIN NO. 212 PL. XI. J3 A. FISH-TAIL CORE-BARREL ADAMANTINE OR SHORT DRILL. HAYES ANDKENNEDY. COST OF DRILLING. 169 and a sufficient supply of water passing through, as a stoppage for ashort time often sticks the work, and considerable time is lost, asthe rods and often the c
Bulletin of the United States Geological Survey--Oil Fields of the Texas-Louisiana Gulf Coastal Plain . Fig. 12.—Derrick with machinery in place. The work progresses rapidly at first, but becomes slower as the drillgoes downward. Great care is required to keep the drill in motion U. S. GEOLOGICAL SURVEV BULLETIN NO. 212 PL. XI. J3 A. FISH-TAIL CORE-BARREL ADAMANTINE OR SHORT DRILL. HAYES ANDKENNEDY. COST OF DRILLING. 169 and a sufficient supply of water passing through, as a stoppage for ashort time often sticks the work, and considerable time is lost, asthe rods and often the casing already in place have to be withdrawnfrom the well. In starting a well, arrangements are generally made for the insertionof a 12-inch casing to begin with, and in boring for this size the drillrods are generally made of 6-inch casing with a 13^-inch bit. Thissized bit is used to allow the collars at the joints of the 12-inch casingto slide past without damaging the wall of the well. The length of12-inch casing used varies from 500 to 800 feet, depending largelyupon the nature of the ground and the skill of the driller. The holeis generally left open until the whole depth calculated for one stringof casing has been drilled. This generally extends until a hard stra-tum is met with, upon which the casing to this dept
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