The casing and tail pipe drilling technology has made great progress in the past 10 years and is gradually maturing. Compared with conventional drilling, casing drilling has the following advantages: saving time for drilling; improving well depth and well quality, saving well washing time; reducing downhole accidents; improving well control conditions; effectively protecting reservoirs and improving single Well production capacity; savings and drilling have the costs of purchasing, transportation, inspection and maintenance. Especially in the vulnerable layer, the soft formation and the stratum with large changes in pore pressure, casing drilling has considerable advantages.
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