生分解性樹脂による脱水調整剤の改良

抄録

Polyglycolic Acid (PGA) and Polylactic Acid (PLA) are biodegradable resins. They have been widely used for medical operations, since the products left in human body dissolve with time. They are harmless and biodegradable. Granular CaCO₃ has been used as a fluid loss control material for completion fluids. The mud cake has to be removed after completion equipment are installed, however, it tends to remain partially undissolved. The PGA powder and PLA powder turn to be liquid acids with time if they are mixed in water. They are also environmentally harmless if they are disposed in ocean. It is judged that these properties may be suitable to replace the granular CaCO₃. Moreover, the adjustment is possible by mixing PGA with PLA for applications of wider temperature range.