Well treatment method using sodium silicate to seal formation
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United States of America Patent
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May 5, 1987
Grant Date -
N/A
app pub date -
Apr 25, 1986
filing date -
Apr 25, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A squeeze silicate operation carried out through a coiled tubing for sealing upper perforations in a well casing to prevent flow of excess gas. A sodium silicate mixture is used which has a diverter material therein which rapidly builds a filter cake on the formation as the silicate is squeezed through the perforations. This filter cake forms a barrier which, in turn, prevents further flow of silicate into the formation. This effectively limits the depth of penetration of the silicate into the formation while still providing a good seal against flow through the squeezed perforations.
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