MARINE MULTIHOLE GAS WELL FOR OPERATION OF OFFSHORE DEPOSITS ARCTIC ZONE WITH SURFACE ARRANGEMENT OF WELLHEAD EQUIPMENT Russian patent published in 2016 - IPC E21B43/01 E21B33/35 

FIELD: mining.

SUBSTANCE: invention relates to design of intelligent gas wells at sea and offshore deposits, including Arctic zone. Offshore gas multi-hole well includes main and side shafts, water separation string and located on sea ice-proof platform wellhead. Said head has casing head and mounted on it production tree. In casing string head to wedge suspension is suspended conductor located inside said water separation column. In string head on wedge suspension is suspended production string located in main borehole. It is concentrically fitted with composite elevator column equipped with underground equipment. Marine riser is lowered below sea bottom at a depth of overlapping near-bottom zone of rocks. Upper end of said column is placed over sea ice-proof platform deck below string head. Conductor is lowered to depth of clay interlayer and is fixed in strong clay rocks. Production string is located in vertical part of main borehole. It is equipped with operational shank lowered to roof of productive formation, which is connected to shank end-filter. Above it to production shank suitable offshoot with liner-filter, directed towards diametrically opposite to liner-filter of main shaft. Upper and lower fibre-optic borehole flow meters of underground equipment component of tubing string are located above and below offshoot. Wellhead cutoff valve, tubing string located in upper part is made with possibility of remote control. Upper and lower fibre-optic borehole flow meters and downhole pressure and temperature sensor can be connected with data collection unit.

EFFECT: increased drainage zones of productive formation and higher efficiency of remote control of well operation in real time in Arctic conditions.

4 cl, 1 dwg