Greenblum & Bernstein, P.L.C.
Drilling fluid additive
The present invention provides a drilling fluid additive comprising a specific cation-modified PVA-based resin and a drilling fluid containing the same. The drilling fluid additive can reduce hydration swelling of inorganic clay mineral such as bentonite, and provide a drilling fluid such as drilling mud capable of forming a thin and tough mud wall on the stratum during drilling operation.
THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
C C C
C09K C08F C09K
additional inventional inventional
Midori Masahiro
Asai Saito