WELL SYSTEM AND WELL FINISHING METHOD Russian patent published in 2018 - IPC E21B41/00 E21B43/10 

FIELD: drilling of soil or rock.

SUBSTANCE: group of inventions refers to a method for completing a well and to a well completion system. According to a method for well finishing for completing a well completion system with an internal barrel of unchanged diameter in the deposit in the formation, a hole is drilled in the formation, introducing a casing string having an inner diameter of the casing, cement the outer surface of the casing guide relative to the hole. Drill head is then inserted into the casing guide, the main trunk passing from the casing guide is drilled. Main barrel has first and second parts, the second part comprises an end of the main barrel with an internal diameter equal to the inner diameter of the casing guide. Next, the drill bit is removed from the main barrel and the casing guide, introducing a lower production casing with annular barriers and an inner diameter into the second part of the main trunk, at least one of the annular barriers of the lower production casing, inserting the drill bit into the first part of the main shaft under the guide casing, drill a lateral trunk from the first part of the main trunk. Lateral trunk has an internal diameter equal to the inner diameter of the main trunk. Then, the boring head is removed from the sidetrack, the lateral production casing is injected completely into the lateral trunk, wherein the lateral production casing has annular barriers and an inner diameter equal to the inside diameter of the lower production casing, so as to provide a complete well with an internal barrel of uniform diameter having the same internal diameter in all production casing columns. Further, at least one of the annular barriers of the side production casing is installed, main production casing string is introduced into the first main trunk portion, so that a connection is made to transfer the fluid of the main production casing to the lower production casing, wherein the main production casing has annular barriers and an inner diameter equal to the inner diameter of the lower production casing. Annular barriers of the main production casing are installed and an aperture is made in the main production casing in front of the lateral production casing, providing a connection for transferring the fluid of the side production casing to the main production casing, so that a fluid communication connection is made between the lower production casing, the main production casing and the side production casing.

EFFECT: technical result is that, when performing maintenance work on the main production casing, it is possible to perform maintenance work in the side production casing as well.

19 cl, 30 dwg