| 摘要 |
The apparatus and method for drilling through the casing utilizes a yieldable biasing element to provide a self-adjusting length and exerts a predictable, controlled biasing force against the casing cutter for penetrating the casing. The cutter will be suspended from the well head by an element which will stretch to some extent, and the self-adjusting length will compensate for this also. As the cutter is lowered into position, and during the casing cutting operation, a flow of pressurized gas or emulsion can be directed through the down hole unit, to clear cuttings and other solids from the cutter's path.
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