METHOD AND DEVICE FOR ZONAL ISOLATION AND MANAGEMENT OF RECOVERY OF HORIZONTAL WELL DRAINED RESERVES

摘要

The invention relates to the oil and gas production industry, in particular, to development and production of oil reservoirs with various permeability zones, specifically, with lateral/lateral horizontal holes, drilled from the production casing. The method described includes running into the well of a tubing string with a cable, control devices in form of electrical valves, measurement pressure and temperature sensors, and one or more packers for isolation of the downhole space, in which information from the sensors is passed to the measurement unit at the wellhead, and signals for opening/closing of the control devices are transferred from the wellhead control unit by the cable; delivery of the wellstream to the surface is performed with a pump through the tubing interior. Besides, a well is constructed with a horizontal section, passing through the various permeability zones of the formation, and the packers are installed in the horizontal section of the well to isolate these zones of various permeability, the tubing interior is isolated by a plug, above which the upper and lower control devices are located one above the other in a vertical hole, provided with measurement sensors; further, zones of the same/approximately the same permeability are connected to form two streams, communicating with the downhole space and inlet of the upper control device or the tubing interior and inlet of the lower control device; outlets of the control devices are connected to the pump inlet, and degree of opening of the control devices is controlled by the same cable with frequency separation, by which data from the measurement sensors are also transferred, and degree of opening of each control device is determined by these data. Besides, each control device is located in a housing of an electric gearmotor, the rotating shaft of which is connected, by means of a screw-nut connection, with a tappet and a valve, made to provide hermetically sealed contact with a valve seat, below which a sleeve is installed with the inlets, made in form of channels, in which a compensation chamber with flexible walls is located; the chamber is filled with lubricating fluid and communicates with internal space of the tappet and sealed space above the tappet. Thus, application of the invention makes it possible to expand operational capabilities of production from horizontal wells, simultaneously including low- permeable and medium/high-permeable intervals of various geophysical properties, isolated by packers, via two independent streams by means of conduits, connecting them and coming through the packers, with surface controlled regime of production from each isolated zone. Moreover, location of the control devices, measurement sensors and a cable in the vertical section of the well provides for reduction of the equipment installation costs and improvement of quality and reliability of the installation.