Inventors:
Jeffrey D. Musselwhite - Houston TX
Jeffry C. Ehlinger - Houston TX
Jerry P. Allamon - Montgomery TX
Jack E. Miller - Houston TX
Assignee:
Davis-Lynch, Inc. - Pearland TX
International Classification:
E21B 3406
US Classification:
166386, 1662428, 166327, 1663344, 1663328
Abstract:
A float shoe/collar apparatus and method for multi-purpose use in running a tubular string such as a casing string or liner into a wellbore and for optimizing cementing operations. In one presently preferred embodiment, the apparatus permits auto filling of the tubular string as the string is lowered into the wellbore. Circulation can be effected through down jets for washing the wellbore as necessary. After the tubular string is positioned, the down jets can be blocked off and up jets opened to thereby direct cement upwardly to optimize cement placement. Check valves can also be activated to prevent flow from the wellbore into the tubular string. In one embodiment, the apparatus comprises an inner member and tubular member. The inner member is movable upon release of shear pins to cause longitudinal movement relative to the outer member. The movement of the inner member may close a plurality of downward jets and may also open a plurality of upward jets, if desired.