METHOD FOR PROVIDING FOR CONNECTION BETWEEN SHAFT OR SHAFTS OF SIDE BRANCH WITH BARE MAIN SHAFT OF WELL AND DEVICE FOR REALIZATION OF SAID METHOD, SYSTEM FOR COMPLETING WELL HAVING SIDE BRANCH, METHOD FOR CONNECTING EQUIPMENT OF MAIN SHAFT OF WELL TO EQUIPMENT OF SIDE SHAFT AND DEVICE FOR REALIZATION OF SAID METHOD Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: after drilling of well having one or two side branches, in casing column of main well shaft in positioned and directed position with combination relatively to port of casing column, coming into side branch with mounted tail piece, an extracted template is placed for side branch. Then, during mounting of extracted connector for side branch an assembly for connecting connector to template is formed, which together form a main for product flow, which is characterized by maximally increased mechanical integrity and optimized product flow in side shaft and in main shaft. Template and connector for side branch allow to perform a selective repeated entering of side branch, and provide for hydraulic isolation of bed around the connection from flowing environment which circulates as in side branch, as in main well shaft. Both template for side branch and connector for side branch are previously made and mounted in the well by means of lowering and mounting tools. After mounting, for performing extraction operations and extraction control in main shaft of well and branch shaft lines for transferring electric energy and hydraulic pressure may be used, which are placed in assembly of template and connector. Equipment may be reversed in wells drilled at any angles and with any direction and during insertion may resist low or high well curving activity.

EFFECT: higher reliability and stability of connection of side branches to main well shaft.

6 cl, 21 dwg