Importance

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Abstract

A mudsaver valve for use in well drilling operations includes an elongated tubular main body supporting a tubular mandrel-like mudsaver closure member therein for movement between valve open and closed positions. A coil spring is disposed in the main body member and is engageable with the mudsaver closure member to bias the mudsaver closure member in a valve closed position. The mudsaver closure member includes an axial passage formed therein and ports opening from the axial passage to the exterior of the mudsaver closure member. The mudsaver closure member is engageable with an annular resilient packoff element and is pressure biased to move to an open position wherein the ports pass through the annular packoff element to allow fluid to flow through the valve. A flowback valve is integrated with the mudsaver valve and comprises an annular resistant duckbill type closure member mounted in a second body member attached to the main body member and responsive to pressure fluid in a casing in which the mudsaver valve is disposed to equalize fluid pressure between the interior of the casing or similar conduit and a supply conduit connected to the mudsaver valve.

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First Claim