OREANDA-NEWS. April 02, 2014. The technology of JSC TATNEFT "System for controlled liquid extraction from the sections of a horizontal wellbore without stopping the well operation process" took the second place at the XVth International specialized exhibition "Energy. Resource Saving" in the category "Equipment and technology, which implementation allows reducing operational costs of fuel and energy resources and materials and/or reducing the harmful impact on the environment throughout the life cycle".

The technology developed by the experts of TatNIPIneft is applied in the operation of horizontal and inclined wells for both individual and dual operation of reservoirs areas with different permeability and allows improving profitability of wells operation by ensuring a more effective flow of oil.

The method is implemented using control devices in the form of electric valves with pressure and temperature measuring sensors, one or more packers shutting off downhole space and pipe subs uniting the reservoir intervals with different oil permeability.

The sensors are linked with the measurement unit at the wellhead, while adjusting devices are connected with the control unit through a cable. The pump for lifting products to the surface through the annulus is placed above the control devices.

The technology expands technological capabilities in the production from horizontal wells by connecting both low permeability and high permeability intervals production through two independent channels. These channels are regulated from the surface modes through adjusting special production modes, which allows increasing the recovery rate of the well. Moreover, the placement of control devices, transducers and the cable in a vertical wellbore allows reducing equipment installation costs and increasing the quality and reliability of the equipment installation.

The economic effect is achieved through increasing the oil recovery and reducing the water cut.
The technology is being field tested at NGDU "Jalilneft" of JSC TATNEFT. The horizontal section of the wellbore was divided by the packer into two independent production intervals. Shutting off the far portion allowed reducing the product water cut 5 times. The works on optimizing the dual production modes from separated wellbore portions are being continued at the well at present.

The Russian Federation patent for invention number 2488686  has been granted for the device and the method of its implementation.