Well drilling and servicing fluids with magnesia bridging solids and methods of drilling, completing and working over a well therewith
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United States of America Patent
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Issued Date -
Apr 13, 2006
app pub date -
Oct 8, 2004
filing date -
Oct 8, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention provides well drilling and servicing fluids, and methods of drilling, completing, or working over a well therewith, preferred fluids comprise an aqueous liquid, a water soluble polymer viscosifier (preferably xanthan gum), a polymeric fluid loss control additive (preferably a partially depolymerized partially crosslinked hydroxyalkyl ether derivative of starch or a hydroxyalkyl ether derivative of a partially crosslinked and partially depolymerized starch), and as a bridging agent a particulate magnesia that has an Activity Index greater than about 800 seconds, preferably from about 800 seconds to about 3000 seconds.
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