Patent ID: 6460620
Filing Date: 2002-10-08
Classification: E21B,Y10T

Abstract:
A mudsaver valve for use in well operations to prevent spillage of wellbore circulation fluid from a conduit for conducting such fluid to a wellbore, said valve comprising:an elongated tubular main body member; an elongated, generally tubular mudsaver closure member disposed in said main body member, said mudsaver closure member including an elongated axially extending passage formed therein and passage means opening to an outer surface of said mudsaver closure member; a biasing spring disposed in said main body member and engageable with said mudsaver closure member for biasing said mudsaver closure member in a valve closed position; and an annular packoff element adapted to remain stationary and be in substantially fluid tight sealing engagement with said mudsaver closure member whereby fluid flow through said mudsaver valve is prevented when said mudsaver closure member is in a first position and fluid may flow through said axially extending passage and said passage means when said mudsaver closure member is in a second position.