The book focuses on the causes of failures of oil producing pumps as a result of the aggressive action of the oil-producing environment. To ensure a good durability of the pumps, the application of laser spraying technology is investigated. Keywords: Oil Pumping Complexes, Oil Fluids, Gas Dynamic Analysis, Downhole Pumps, Calculation of Cutting Modes, Causes of Failures, Wear Mechanisms, Gas-Dynamic Calculation, Simulation Flow Software, Laser Spraying, Internal Surfaces, Electric Centrifugal Pumping, Rod Depth Pump, Non-Standard Pumps, Causes of Malfunctions, Restoring Pump Operability, Salt Deposition Inhibitors, Laser Source, Boring Head, Small-Diameter Structures.