METHOD OF CONSTRUCTING COASTAL MULTI-HOLE GAS WELL FOR DEVELOPMENT OF SHELF DEPOSIT Russian patent published in 2016 - IPC E21B43/01 E21B43/02 E21B7/04 

FIELD: oil industry.

SUBSTANCE: invention relates to oil and gas industry and, in particular, to production of gas during operation of sea and offshore deposits, including Arctic zone. Method comprises drilling a main shaft on shore to level of sea bed. In lower part of main shaft an inclined section is formed with deviation from vertical of up to 80°. Further, a horizontal section is drilled, which is laid under sea bottom with length providing drilling of productive formation in required design point of productive formation. Horizontal section is made with an end which is arranged perpendicular to horizontal section, parallel to roof of productive formation and higher than gas-water contact. Before said end in main shaft an offshoot is made, which is directed in diametrically opposite direction from said end of horizontal section of main shaft in same productive formation and is located parallel to roof of productive formation and higher than gas-water contact.

EFFECT: technical result is increase of gas production due to expansion of productive formation drainage zone, reduced costs for maintenance of well due to reduced period of production of gas reserves from deposit.

1 cl, 2 dwg