Abstract: The present invention relates to the oil-and-gas industry, specifically, to the development and exploitation of oil reservoirs with various permeability zones, including by means of lateral horizontal bore segments. The method of interval action on horizontal wells includes the steps at which a horizontal segment of the wet is bored preliminarily, the same segment being constructed through the formation with various permeability zones. Geophysical survey is conducted and the number of the oil recovery intervals of various categories and their lengths are determined. A tail pipe (or tail filter) of the casing string with packers and drive shoe is lowered down and installed in the horizontal segment of the well. A pump and an assembly on the pipe string is lowered down into the well, the same assembly consisting of the electric valves with the pressure and temperature sensing devices, the cable and the packers separating the annular space of the well.

Abstract: A method of well casing permitting thermal oil recovery includes drilling a wellbore to the top of productive formation, casing the wellbore with a casing string, drilling through the productive with a smaller diameter bit, running in a sand screen to the productive formation and subsequent drainage or heat carrier injection into the formation. The sand screen contains longitudinally-corrugated pipes with slots, mutually connected by the end cylindrical portions with a limited longitudinal shift possibility. Besides, the sand screen slots are internally hermetically sealed with a thermoplastic material. Running-in of the screen down to the target depth, include creating an internal excess pressure to expand the sand screen along its entire length except for cylindrical sections, fixing and hermetical anchoring to the casing. Pumping-in of a heat-carrier, under influence of which the thermoplastic material melts up, unseals the slots.

Abstract: A method of well casing permitting thermal oil recovery includes drilling a wellbore to the top of productive formation, casing the wellbore with a casing string, drilling through the productive with a smaller diameter bit, running in a sand screen to the productive formation and subsequent drainage or heat carrier injection into the formation. The sand screen contains longitudinally-corrugated pipes with slots, mutually connected by the end cylindrical portions with a limited longitudinal shift possibility. Besides, the sand screen slots are internally hermetically sealed with a thermoplastic material. Running-in of the screen down to the target depth, include creating an internal excess pressure to expand the sand screen along its entire length except for cylindrical sections, fixing and hermetical anchoring to the casing. Pumping-in of a heat-carrier, under influence of which the thermoplastic material melts up, unseals the slots.

Abstract: The invention relates to well reamer for borehole reaming within a specified interval. The well reamer has a housing with inclined slots, radial holes and a central straight-through channel, in which a spring-loaded rod with holes in the upper and lower parts is located. The upper holes of the rod are covered when the operating elements are extended into an operating position. A plurality of legs, including cutters rotatably supported on the legs, are moved by pistons between an operating position and a transport position along the inclined slots. Free-ends of the pistons may be connected to the rod by sliders, which are movable radially into openings in the rod to connect the rod to the pistons to move the rod with the legs.

Abstract: A device for expansion and calibration of profile pipes, such as profile liners, with cylindrical threaded ends in their installation in a well. The device has a plurality of in-series connected mandrel assemblies, each of which has a housing with a central straight-through channel and inclined slots, in which rains are fastened and hinge-connected through pushers, tightened with respect to the housing, with a spring-loaded rod, accommodated in the central straight-through channel of the housing. Rods of an upper mandrel assembly are spring-loaded for holding the rams in nonoperating position, and rods of a lower assembly are spring-loaded for holding the rams in operating position. The lower mandrel assembly is provided with a choke. The Maximum diameter of a circle circumscribed about each mandrel assembly in its working position decreases from the upper assembly to the lower one.