METHOD OF TAPPING OF PRODUCING FORMATION IN UNDERWATER PRODUCTION OF HYDROCARBON MATERIALS Russian patent published in 2002 - IPC

FIELD: technology of production of hydrocarbon materials from geological structures occurring under sea water and developed by underwater methods. SUBSTANCE: method includes sinking of well down to horizon of producing formation, and before the most important operation - tapping of producing formation, flexible tube-forming material with reverse arranged in the form of hairpin curves is located and fixed on wellhead, in preheater equipped for the purpose, and secured to sea bottom. Some material is used for filling cavity of body of self-contained drilling apparatus. Dead end of flexible material (subsequently referred to as a tube) is connected with upper end of apparatus, and apparatus is lowered onto bottom hole with filling of one part of flexible tube cavity, at apparatus upper end, with sea water. With apparatus entering the producing formation, pressure of working medium from apparatus cavity together with pressure of hydrocarbon materials displace the second flexible tube in which hydrocarbon materials accumulate. The first tube is pressed to well walls to form them, and the second tube enters the cavity of the first tube by pressing the first tube and well walls, and forming the second wall from flexible material. When hydrocarbons rise in cavity of formed tube to preventer (wellhead), upper end in sealed chamber of preventer is ruptured at discharge fittings to provide for withdrawal of hydrocarbons from well cavity. EFFECT: higher efficiency. 8 dwg