In this new second edition, author Leonard Kalfayan has updated his 2001 book on acid stimulation, one of the primary methods for improving productivity of oil, gas, injection, and disposal wells. A properly designed and executed acid job can improve cash flow. Kalfayan offers practical guidelines for acid treatment design by stressing a systematic approach to candidate selection, treatment design, as well as execution and evaluation for improvement in profits and productivity. The new edition includes discussions of modern acid systems and treatment methods with worldwide applications for both carbonate and sandstone formations; new concepts for simplifying and proliferating sandstone acid application; the latest in carbonate matrix and fracture acidizing; more on non-conventional acidizing concepts and acid systems; and more on geothermal well stimulation. As with his original book, readers can find practical, useful acidizing information and gain greater understanding and appreciate of its benefits.