A method of clearing well casing or tubing from a target region of an oil/gas well borehole is provided. The clearance of the oil/gas well bore hole being achieved by employing chemical agents that consume, weaken or melt the well casing/tubing. In some aspects of the method the well casing is cleared to expose the rock formation within which the well borehole is formed so that the rock formation can be accessed from within the well casing/tubing. In other aspects of the method the removal of inner tubing structures is used to facilitate the unimpaired deployment of repair tools down the well borehole.
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