https://www.deepwellpump.net/news/industry-news/innovation-below-the-surface-china-s-submersible-screw-pump-technology.html
Submersible screw pumps are a type of positive displacement pump designed to handle viscous fluids, slurries, and abrasive materials with ease. Unlike centrifugal pumps, which rely on kinetic energy to move fluids, submersible screw pumps utilize the action of rotating screws to push fluids along the pump's axis, providing consistent and reliable performance even in challenging environments.