Wells – Valves – closures or changeable restrictors
Patent
1974-12-12
1976-05-25
Purser, Ernest R.
Wells
Valves, closures or changeable restrictors
175 65, 175 72, 175210, G21B 23100
Patent
active
039586405
ABSTRACT:
The present disclosure is directed to a method of drilling an oil well so that the large diameter casing initially employed can be salvaged and reused which is attainable by effecting a temporary seal between the bore hole and casing so that a dual function is attained, firstly the seal forces the mud return up to the surface inside the casing and secondly the area between the bore hole and casing is closed to cuttings cement and other matter which may fall into a bore hole and cause the casing to become secured to the walls of the bore hole and prohibit the withdrawal of the casing from the bore hole. When it is desired to remove the casing the temporary seal is broken and the casing raised axially of the bore hole.
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Ebel Jack E.
Purser Ernest R.
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