Patent RU-2758326-C1 (RU)
Inventor: AKHMADIEV RAVIL NUROVICH
IPC: E21B43/12
Filed: 2021-04-12
Granted: 2021-10-28
Abstract: FIELD: mining industry.  
     SUBSTANCE: method for regulating the operating mode of a well equipped with an electric center pump installation in an inter-well pumping system is claimed. The method includes analysis of development conditions, injection of a working agent into injection wells-acceptors by inter-well pumping of reservoir water from a donor well equipped with an electro-centrifugal pump with a frequency-controlled drive, selection of reservoir products from producing wells, regulation of the injection volume. Additionally, the current and previous data for three years on the debits of producing wells, the volumes of injection of reservoir water into acceptor wells, the debits of donor wells are analyzed, taking into account the hydrodynamic characteristics of the inter-well fluid pumping system, the parameters of the optimal operating range of the pressure-flow characteristics of the pumping unit and the permissible range of the frequency of rotation of the submersible electric motor are determined, which ensures the stability of the performance of the electric center pump. The injection mode is being developed taking into account the daily production volume for each donor well and the daily volume of liquid injection for each acceptor well. The tightness of the deep-pumping equipment is checked, a pressure sensor is installed on the outlet line of the mouth and connected to the control station controller. The control station controller introduces an algorithm for controlling the installation of an electric centrifugal pump by pressure at the wellhead, the maximum permissible nominal values for pressure at the wellhead, according to which the frequency of the supply voltage is subsequently regulated. The electric center pump is started from the control station at optimal performance with a frequency of 50 Hz, the pump is operated until the working pressure at the mouth reaches a value equal to the nominal value of Pop = Pnom ± ∆, ∆ = 5%, when the pressure deviates from the working pressure in the larger direction P > Pop, the frequency of the supply voltage      is reduced by ∆      equal to 5 Hz, the pump continues to operate until the nominal value of the wellhead pressure reaches Pop = Pnom ± ∆, when the pressure deviates from the working pressure at the wellhead in a smaller direction P<Pop, the frequency of the supply voltage       is increased by the amount of ∆     , the pump continues to operate until the nominal value of the wellhead pressure is reached, Pop = Pnom ± ∆, and when the pressure at the wellhead is more or less than 5% of the nominal pressure, the cycles are repeated depending on the nature of the deviation by the amount of ∆      one step less up to 4 Hz.  
     EFFECT: increase in oil recovery of the deposit while simplifying the implementation of the method for regulating the operation of the well, reducing the risks of pump failure, increasing the operating coefficient, expanding the technological capabilities of the method for regulating the operation of the well.   
     1 cl, 3 dwg