This report presents the background and results of a program initiated by the U.S.. Department of Energy to assess the feasibility of gas repressurization to improve the economic recovery of petroleum by small, independent oil production companies. The work was performed under prime contract DE-AC22-94PC91008 by BDM-Oklahoma, Inc., as part of Work Authorization A03 Extraction Research, Improved Recovery Processes, Task 8 "High Potential Recovery-Gas Repressurization." Workshops were conducted around the United States to present the program to independent producers and to inform them of a solicitation for proposals to conduct cost-shared projects to demonstrate gas repressurization technologies. A solicitation was conducted, and four subcontracts were awarded to demonstrate the use of natural gas and flue gas to improve oil recovery by small independent producers. This report also includes the four final reports from the field demonstration projects. Two of the demonstration projects, one using flue gas and the other involving natural gas from a deeper coal zone, were both technical and economic successes. The two major lessons learned from the projects are the importance of (1) adequate infrastructure (piping, wells, compressors, etc.) and (2) adequate planning including testing compatibility between injected gases and fluids, and reservoir gases, fluids, and rocks.