VOLUME I: SUCCESS OF HORIZONTAL WELL TECHNOLOGY Horizontal technology has been applied in over 110 formations in the U.S .A. Volume I of this study addresses the overall success of horizontal technology, especially in less-publicized formations, i .e., other than the Austin Chalk, Bakken, and Niobrara. Operators in the U.S.A. and Canada were surveyed on a formation-by-formation basis by means of a questionnaire. Response data were received describing horizontal well projects in 58 formations in the U.S.A. and 88 in Canada. Operators'responses were analyzed for trends in technical and economic success based on lithology (elastics and carbonates) and resource type (light oil, heavy oil, and gas). The potential impact of horizontal technology on reserves was also estimated. A forecast of horizontal drilling activity over the next decade was developed. VOLUME II: APPLICATIONS OVERVIEW Horizontal technology has been applied in a wide variety of applications and reservoir settings. Much information has been published on drilling, completion, and workover systems, took and techniques for these wells, especially for the most active formations. Little has been presented describing overall production and economic success of the technology in the wider range of formation types. In Volume IX of this study, numerous case studies and analyses are presented of horizontal technology projects in each major application and resource type. Field location, geology, production and economic success, reserves increases, and production problems are described for each project. Chapters are presented assessing horizontal applications in light-oil, heavy oil, and gas reservoirs. To broaden the base of formation types, especially with respect to heavy-oil and gas reservoirs, Canadian operations are highlighted in the study along with those in the U.S. A. Additional objectives of the study include an assessment of the technical and economic limits of horizontal technology.