PROCESS OF CONSTRUCTION OF HORIZONTAL WELL AND METHODS OF OPENING AND EXPLOITATION OF HYDROCARBON FIELD WITH AID OF HORIZONTAL WELL Russian patent published in 2002 - IPC

FIELD: development of hydrocarbon pool by horizontal wells, production of gas from hydrate-containing deposits. SUBSTANCE: vertical jigs put on well-head have several windows in shoe when double well-head multishaft horizontal well is constructed. For connection of horizontal section to second wellhead zenith angle is set up in agreement with preset radius till it meets jig and navigation system is employed to guide drill bit to inlet window of jig. Pool is opened by horizontal injection and production wells, the latter are positioned above injection wells or inside injection shafts. To prevent formation of gas hydrates oil string of production shaft is so located that it can be heated by injection shafts. During exploitation of horizontal well its adoption is started by circulation of working fluid in production and injection shafts. Direction of pumping of steam is periodically changed. After it oilmen pass to production of gas from both well-heads of production shaft and to pumping of working fluid through injection wells into productive pool. EFFECT: enhanced efficiency of development of deposit of gas hydrates, raised degree of recovery of hydrocarbons thanks to employment of closed man-made filtration ducts and use of double well-head multishaft horizontal well for simultaneous production of hydrocarbons and injection of working fluid, specifically, heating agent or solvent into productive pool. 6 cl, 4 dwg