Method of drilling an oil well to recover casings

Details Method of drilling an oil well to recover casings Method of drilling an oil well to recover casings

1974-06-28

1976-05-25

Murtagh, John E.

Wells

Processes

Cementing, plugging or consolidating

166285, 175 57, E21B 3313

Patent

active

039586391

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.

REFERENCES:
patent: 978359 (1910-12-01), Cooper
patent: 1548012 (1925-07-01), Dunn
patent: 2064936 (1936-12-01), McQuiston
patent: 2259564 (1941-10-01), Holland
patent: 2363269 (1944-11-01), Schlumberger
patent: 2716018 (1955-08-01), Williams
patent: 3110346 (1963-11-01), Spurlock et al.
patent: 3406756 (1968-10-01), Carter et al.
patent: 3713488 (1973-01-01), Ellenburg
Dowell Advertisement, "Oil & Gas Journal," 7/22/74.

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