Placement aid for dual injection placement techniques
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United States of America Patent
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Mar 26, 1991
Grant Date -
N/A
app pub date -
Feb 27, 1990
filing date -
Feb 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of controlling the permeability of underground well formations by the placement of a chemical barrier is provided. A first fluid and a second fluid are substantially simultaneously injected into the formation via a well bore wherein the first fluid generally contains either a viscosifying agent or a permeability reducing agent and the second fluid contains a sealant. As the two fluids extend radially from the well bore, the injection pressures of the first and second fluids are substantially balanced such that migration of the second fluid into portion of the formation occupied by the first fluid is inhibited.
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