Casing filling and circulating apparatus and method
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United States of America Patent
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Mar 26, 1996
Grant Date -
N/A
app pub date -
Oct 27, 1994
filing date -
Oct 27, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
The present invention provides improved casing filling and circulating apparatus for running a casing string into a well bore using a drilling rig casing elevator and related equipment. The casing filling and circulating apparatus includes a flow passage therethrough and a check valve disposed within the flow passage for preventing spillage and for preventing fluid back-flow through the apparatus when the casing string is being lowered into a well bore. Additionally, the filling and circulating apparatus includes a pressure relief seal means which relieves pressure from the casing prior to when the filling and circulating apparatus is disconnected therefrom by back-flow through the apparatus thereby preventing spillage of fluid. Methods of using the casing filling and circulating apparatus are also provided.
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