| 摘要 |
A combination drilling and stimulation process for drilling oil wells and especially those through oil sand which contain a great deal of intergranular clay, which makes use of a clear solution containing calcium chloride instead of the usual drilling mud. The solution of calcium chloride is treated with a liquified surfactant, and the mixture is forced down the annulus formed between the drill pipe and drill collars, and the wall of the drill hole. At the bottom of the well the solution passes the cutting face of the bit and picks up the chips, flushing them outwardly through the drill collars and drill pipe and out at the top.
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