Method for removing filter cake from injection wells
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United States of America Patent
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Dec 27, 2005
Grant Date -
Jan 22, 2004
app pub date -
Mar 25, 2003
filing date -
Jul 19, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A method is given for completing an interval of an open-hole injection well penetrating a subterranean formation when the interface between the wellbore and the formation includes a zone invaded by a filter cake that includes bridging materials and other embedded solid materials. The method includes the steps of injecting a clean-up fluid and contacting it with the filtercake for a period of time sufficient to loosen some of the other solids embedded in the filter cake; removing the loosened solids by a high-rate displacement fluid containing suspending additives; and then injecting a dissolving fluid containing a diverter and an effective amount of a salt or acid capable of dissolving the bridging material.
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