This document discusses various operating concerns and issues that can arise when pumping different types of fluids, including heavy oil, medium oil, light oil, and water. It notes that pumping heavy oil can cause flow losses due to high viscosity and sand production, which increases wear on pumps. When pumping medium oil, aromatics can cause swelling in elastomers. Gases like H2S and CO2 can also accelerate corrosion. Light oil faces similar issues to medium oil. Water can introduce abrasive solids that damage pumps. Dissolved solids in water can precipitate out as scale. Solutions proposed include using larger diameter tubing, diluents, customized elastomers, corrosion inhibitors, and chemicals to prevent scale formation.