METHOD OF WELL COMPLETION IN COMPLICATED CONDITIONS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC E21B43/16 E21B43/24 E21B7/08 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to methods and devices for well completion in complicated conditions and can be used in production of hard-to-recover oil using horizontal wells. Method of well completion in complicated conditions includes drilling in formation of main horizontal shaft and radial channels during construction of multifunctional well, lowering of production string with isolation of outer annulus, secondary opening of formation by intervals of perforation of production string, performance of tripping operations in well with tool, namely coiled tubing pipe with wire line, whipstock and hydraulic jet assembly, drilling by jet assembly through the whipstock into the depth of the formation of radial channels with an extended trajectory controlled from the wellhead, lowering into production string taking into account intervals of tubing perforation and intelligent equipment, arrangement of annulus, pumping through tubing and injecting process agents into the formation with the possibility of simultaneous withdrawal of the well product with a borehole pump, controlled action on the formation when pumping process agents and withdrawal of the well product. Lowering and lifting operations in the well with the specified tool and drilling of radial channels are carried out after lowering of the tubing and intelligent equipment into the well. First, pairs of first and second inputs are drilled through the tubing, annulus, production string and isolated outer annulus, dividing the main horizontal shaft along the length into separate sections. Then these inputs are equipped with liners equipped with swelling liner packers, after that, two independent networks of radial channels parallel to the main horizontal shaft are drilled through the thoroughly equipped inlets with the hydraulic jet assembly using the same whipstock in each section. Through the first inputs of each section injection networks are formed, and through the second inputs of each section—production networks, then, said tool is withdrawn from multipurpose well and production of well product is started. Possibility of operation of injection and production networks is provided in conditions of multifunctional well with adjustment by sections and in wave mode, note here that jet pump is connected in parallel to first inlets of sections and, at production stage, is fed by process agent injected into formation as active medium. Mixing chamber of jet pump is connected simultaneously to all second inlets of sections and intervals of perforation of production string.

EFFECT: possibility of implementing volumetric and selective action on the deposit, intensification of external action on the formation, increased coverage of its impact due to uniform distribution of impact and extraction of products throughout the deposit volume, increased efficiency of process agents usage by way of their action spreading into the deposit depth.

2 cl, 13 dwg