OPERATIONS CARRIED OUT IN THE WELL-BORE SHAFT WITH THE USE OF THE MULTI-TUBULAR SYSTEM Russian patent published in 2018 - IPC E21B17/18 E21B43/04 E21B43/267 

FIELD: technological processes.

SUBSTANCE: group of inventions relates to the wellbore completion operations using multi-tubular systems. According to the method, introducing containing the main fluid and gravel the wellhead fluid for its processing. Enabling the fluid flow through the multi-pipe system first pipe or the first set of pipes from the wellbore upper portion to the sealed connection, formed between the wellbore upper portion, the wellbore lower portion and at least one lateral wellbore. Depositing at least a portion of the gravel inside the wellbore lower portion or side shaft. Returning at least a portion of the main fluid through the second pipe or the second set of pipes of the multi-tubular system from the borehole lower portion or side shaft to the wellhead. Using the multi-tubular system, comprising several tubular elements, rigidly attached to each other along the axial length elements. Attached tubular elements together form the cross-sectional shape in the circle generally D-shaped section. At least two tubing strings, each of which has the D-shaped cross-section, are located side by side in the wellbore. At least one of these strings comprises the said multi-tubular system. Wellbore side shaft comprises the lateral tubing and the transitional device, attached to one of the two tubing strings and accommodating the D-shaped tubing string, comprising the multi-tubular system, to the said one of the two tubing strings cylindrical shape.

EFFECT: technical result is increase in the well completion efficiency.

21 cl, 5 dwg