Casing shoes and methods of reverse-circulation cementing of casing
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United States of America Patent
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Nov 24, 2009
Grant Date -
Mar 13, 2008
app pub date -
Nov 14, 2007
filing date -
Aug 30, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A method having the following steps: running a circulation valve comprising a reactive material into the well bore on the casing; reverse-circulating an activator material in the well bore until the activator material contacts the reactive material of the circulation valve; reconfiguring the circulation valve by contact of the activator material with the reactive material; and reverse-circulating a cement composition in the well bore until the reconfigured circulation valve decreases flow of the cement composition. A circulation valve for cementing casing in a well bore, the valve having: a valve housing connected to the casing and comprising a reactive material; a plurality of holes in the housing, wherein the plurality of holes allow fluid communication between an inner diameter of the housing and an exterior of the housing, wherein the reactive material is expandable to close the plurality of holes.
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