Abstract: The present method of drilling, completing and fracturing enhances the production from any reservoir where artificial lift devices are required. However, this method is most suitable for a low pressure, partially depleted subterranean reservoir (50) where secondary recovery methods have proven unsuccessful, or where virgin drainage and pressure has been depleted. The method comprises drilling a substantially horizontal wellbore (20) which penetrates a subterranean reservoir (50) at a degree sufficient to provide drainage through the total vertical section of the reservoir. The horizontal wellbore (20) intersects a vertical wellbore (10) at the lowest vertical depth reached. Fracture stimulation may be applied from either the vertical wellbore, the horizontal wellbore, or both. Moreover, several horizontal well bores (20) can be drilled from a single surface (a) location to intersect other vertically drilled wells (10) or existing producing wells in a reservoir.

Abstract: A method for injecting carbon dioxide into an oil or gas well. The carbon dioxide is transported to the well site in a tank while maintaining it at a temperature and pressure sufficient to retain the carbon dioxide primarily in a liquid state. The liquid carbon dioxide is drawn off and pumped to an intermediate pressure by a booster pump. To avoid flashing in the line due to the pressure drop as the liquid is withdrawn, a feedback loop between the output of the booster pump and the tank is utilized. A vaporizer is located in the feedback loop for vaporizing the carbon dioxide injected back into the tank. The amount injected is controlled to maintain the tank at a sufficient pressure to avoid flashing in the discharge line. After the booster pump, the remainder of the liquid carbon dioxide is pumped to a higher pressure by a high pressure pump. The high pressure liquid is commingled with other high pressure liquids and pumped down the well.