Abstract: A method and apparatus for removing a string of casing from a well bore. The method and apparatus include a plurality of drill bits substantially aligned with each other for drilling a plurality of holes in the string of casing. The plurality of holes can be used to lift the string in casing from the well bore via a series of incremental casing sections.

Abstract: A method and apparatus for removing a string of casing from a well bore. The method and apparatus include a plurality of drill bits substantially aligned with each other for drilling a plurality of holes in the string of casing. The plurality of holes can be used to lift the string in casing from the well bore via a series of incremental casing sections.

Abstract: The present invention is directed to elongate rigid thermoplastic articles that are molded from thermoplastic material and which maintain their shape even at length-to-width ratios (i.e. aspect ratios) ranging from about 4:1 to about 15:1 or greater. The inventive elongate rigid thermoplastic articles comprise molded thermoplastic material having disposed interiorly therein along their longitudinal extent a system (e.g. a pair) of slideably interengaged members. Preferred slideably interengaged members comprise hollow pipes that are sleeved for slideable interengagement. In the molding of elongate rigid thermoplastic articles in accordance with the present invention, the interiorly disposed slideably interengaged members are acted upon by the shrinkage of the cooling thermoplastic material resulting in the members sliding into closer interengagement. Distortion of the cooled elongate thermoplastic articles is substantially suppressed thereby.