CONTAINER IN SHELL FROM COMPOSITE MATERIAL FOR CONSTRUCTION OF MULTI-HOLE WELLS Russian patent published in 2013 - IPC E21B7/08 E21B17/00 

FIELD: oil and gas industry.

SUBSTANCE: container in shell from composite material for construction of multi-hole wells includes the section of casing string with preliminary cut window in it for direction of drilling tools and casing string covered from the outside by the layer of easy-drilled material and annular grooves interacting with layer ends made at its external surface below and above the window. From the outside the layer ends are pressed via rings to the casing string section, note that there are sealing elements mounted between the window and annular grooves. Also the layer ends from the outside can have thread and rings are made with the possibility of tight interaction with casing string section and equipped with the thread from inside for layer external thread.

EFFECT: structure allows reducing procurement costs for its production and use as well as provision of tightness between casing string section and layer of easy-drilled material.

2 cl, 4 dwg