Methods and apparatus for cementing drill strings in place...

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Reexamination Certificate

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Details

C175S309000, C166S386000, C166S054000

Reexamination Certificate

active

07013997

ABSTRACT:
The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are described that provide for the efficient installation of a cemented steel cased well wherein the drill string and the drill bit are cemented into place during one single drilling pass down into the earth. Methods of operation are described wherein at least one geophysical parameter is measured with a geophysical parameter sensing member located within the drill string. A one-way cement valve is installed near the drill bit of the drill string that allows the cement to set up efficiently under ambient hydrostatic conditions while the drill string and drill bit are cemented into place during one single drilling pass into the earth.

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