E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/5
E21B 49/02 (2006.01) E21B 25/08 (2006.01)
Patent
CA 1237653
27 METHOD AND APPARATUS FOR PREVENTING CONTAMINATION OF A CORING SPONGE ABSTRACT OF THE INVENTION A well coring apparatus (10) includes an outer barrel (12) and an inner barrel (18). The inner barrel (18) is sealed at one end with a sealing member (80) and has a reciprocating piston (70) disposed in the other end thereof. An O-ring (68) is disposed at the receiving end of the inner barrel (18) to provide a seal therefor. Spring members (76) provide a restrictive force to the piston (70). A sponge (50) is disposed around the inner walls of the inner barrel (18) for contacting the core (82). A fluid is disposed in the inner space (78) of the inner barrel (18) and pressurized. Reciprocation upward of the piston (70) causes the fluid to flow therefrom out the receiving end of the inner barrel (18). This flow of fluid washes the sides of the core (82) to prevent drilling mud from caking about the surfaces thereof and preventing proper transfer of fluids contained within the core (82) to the sponge (50). The fluid in the inner space (70) has a density that is lower than that for fluids external to the inner barrel (18) such that contamination of the sponge (50) is prevented.
493111
Park Arthur
Wilson Bobby T.
Diamond Oil Well Drilling Company
Halliburton Energy Services Inc.
Kirby Eades Gale Baker
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