Method of preventing in-depth formation damage during injection of water into a formation
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United States of America Patent
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Oct 12, 1993
Grant Date -
N/A
app pub date -
Mar 25, 1992
filing date -
Mar 25, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In-depth formation damage is prevented during water injection by adding to the water non-compressible solids of sufficient size and concentration to form an external filter cake within the injection well. Preferably, the non-compressible solids are either diatomite, perlite, saw dust, or calcium carbonate, and the concentration of non-compressible solids is from 0.001 to 5 wt%. When no longer needed, the external filter cake is removed from the injection well by using an acid wash or back-flowing the well.
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