Abstract: Gelatin capsules containing oil field chemicals, preferably weighted with a heavy metal compound, are made more stable under certain conditions by the incorporation of a strong chelating agent. The microcapsules can provide an extended treatment period since many materials that would damage the microcapsules are controlled by the chelating agent.
Type:
Grant
Filed:
July 13, 1999
Date of Patent:
December 4, 2001
Assignee:
Corsicana Technologies, Inc.
Inventors:
Thomas Charles Kowalski, Robert Wayne Pike