Acid gas is a mixture of carbon dioxide and hydrogen sulfide, with small amounts of light hydrocarbons, which is the by-product of the process for removing these unwanted components from raw natural gas. Because companies are no longer allowed to flare (burn off) excess acid gas, acid gas injection has emerged as a technology that is suitable for dealing with small amounts of unwanted acid gas. Gas injection involves the compression of the stream, transportation by pipeline to an injection well, then the fluid travels down the well and into a suitable formation. Larger producers have started to use this technology for their applications and in the future it is predicted that even larger projects will be developed. This book is the most comprehensive and up-to-date coverage of this technique, which is rapidly increasing in importance and usage in the natural gas and petroleum industry. The authors, a group of the most well-known and respected in the field, discuss, in a series of papers, this technology and related technologies as to how they can best be used by industry. This process will help companies in the energy industry "go green," by creating a safer, cleaner environment. These techniques also create a more efficient and profitable process in the plant, cutting waste and making operations more streamlined.