MICRO-CAPSULES OF AUXILIARY SUBSTANCES FOR DRILLING FLUID WHEN RECOVERING OIL AND METHOD OF THEIR USE

摘要

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.