FIELD: oil and gas industry.
SUBSTANCE: invention relates to the oil and gas industry and can be used to normalize the flow area of additional production strings. An assembly is lowered, including a sequentially located milling tool, a small-sized screw downhole motor, a check valve, a filter for a small-diameter drill pipe with a sub, a small-diameter drill pipe, a sub, a filter for a large-diameter drill pipe and a large-diameter drill pipe. When lowering the assembly, test engine starts are performed every 500 meters, 50 meters before entering the additional string, the level of the well in the annular space is filled until circulation is restored. 30 meters before the planned milling interval, the downhole motor is started, the operating parameters of the motor are selected and milling is performed at a minimum load, followed by its increase depending on the penetration rate, periodically lifting the milling tool up. Then the well is flushed and the assembly is raised to the surface, followed by its dismantling. Milling of the cementing sleeve, circulation valve, cement nozzles and / or bridges and dividing plugs is carried out with a tool equipped with diamond-carbide cutters, and milling of the fractions of the multistage hydraulic fracturing is carried out with a pilot milling tool, on the cutters of which a tungsten carbide alloy is applied.
EFFECT: milling efficiency increases, technological capabilities expand, proppant cleaning is provided, and the flow of produced fluid increases.
1 cl, 1 dwg
