The titled additives can be used as mud filtration reducer, thinner and collapse inhibitor.In addition, these additives have high-temperature stability and can restrain shale from hydrating expansion.

• 水溶性天然材料改性产品在钻井液中可起到降滤失、降粘、高温稳定、抑制页岩水化膨胀和防塌等作用。