RU2140524C1 - Device for on-line control of operating conditions - Google Patents

Abstract

FIELD: control of operating conditions of electrically driven pumping units in group of wells. SUBSTANCE: device controls operation of wells alternately according to preset program by correspondence of fluid level in annular space to preset values. Level is determined with use of generating and receiving units of acoustic signals in well. In case of deviation of fluid level from preset values, signal formation system disconnects electric drive of pumping unit from power mains and connects it to converter of voltage frequency. According to preset program, well returns to working conditions, and electric drive is again connected to electric mains of deposit, and inquiry of wells is going is going on. EFFECT: higher reliability of device due to exclusion of necessity of use of downhole transducers of well state. 1 dwg

Description

 The invention relates to the field of automation of processes for controlling the operating modes of submersible electric drive pumping units installed in a group of wells (cluster location).

 A device is known that contains submersible centrifugal pumping units installed in wells with power cables for their electric motors, a voltage frequency converter, state sensors for wells and pumps connected to a system for measuring and generating control signals of electric motors, a unit for determining a sequence of actions by control signals and switches for alternating individual automatic connection of electric motors to the voltage frequency converter [1].

 The condition of the wells is estimated by the readings of the pressure sensors at the intake of the pumps. Sensors are integrated in submersible pumps and cabled to ground equipment. In case of failure, it is necessary to remove all pumping equipment from the well.

 The technical problem solved by the invention is to increase the reliability of the device by eliminating the need to use depth sensors for the condition of wells.

 To solve this problem, a device for the operational control of the operating modes of electric drive pump units in a group of wells, containing a speed controller for the motor shaft, sensors for well condition parameters connected to a system for measuring and generating control signals for electric drives of pumps, and switching devices for connecting electric drives to the field network or electric motors are additionally equipped with ge blocks installed at the mouth of each well acoustic signal reception and reception, while the generation unit is connected to the output of the measurement system, and the reception unit is connected to its input.

 As a speed controller for the shaft of an electric motor, a voltage frequency converter can be used, as is done in the prototype, or a stator pseudo rotation angle converter [2].

 The drawing shows a diagram of a device for the operational control of operating modes, in which a voltage frequency converter is used.

 The device comprises a power supply system from a field network 1 for generating control signals for electric drives of pumping units 2 installed in wells 3 on tubing 4. At the mouth of each well there are transformers 5 supplying electric drives, complete control devices of type 6 SHGS for controlling electric drives, switching devices 7 serving to connect the electric drive to the field network through a device 6 or to a voltage frequency converter 8, and generation and reception units 9 and 10 kusticheskih signals. The electric drives of the pumping units are connected via a transformer to the output terminals of control devices 6 and switching devices 7, the output terminals of which are connected to the output terminals of converter 8, to which the supply voltage of the field (industrial) network is supplied.

 The control signals from the system 1 are fed to the frequency converter 8, to the switching devices 7 and the acoustic signal generating units 9, and information signals are received from the frequency converter 3 and the acoustic signal receiving units 10.

 When the well is put into operation after the “START” command, which arrives from the system 1 to the switching device 7 specified by the program, the corresponding pump unit 2 is connected to the converter 8 and a frequency drive is started according to the program. During the start-up of the well, the system monitors the fluid level in the annulus, giving acoustic signals to it by the generating unit 9 and receiving them by the unit 10. When the fluid level is within the specified values, the system will signal to open the contactor of the switching device 7. When the contactor is opened, a command is issued to turn on the SHGS contactor 6, after which the frequency start of the next pump unit is likewise carried out.

 The control signal generation system 1 monitors the parameters of each well and its pump unit. The well’s output from the nominal operating mode is set according to the determination of the liquid level and the electrical parameters of the pump unit, which are compared with the specified criteria and are the initial data for determining the optimal sequence of the influence of control signals on the electric drives.

 In the process, the system 1 sequentially polls the wells 3 and if the fluid level deviates from the set values in any of the wells, the system disconnects the corresponding electric drive from the SHGS 6 and switches it to the voltage frequency converter 8. A change in the frequency of the voltage accordingly changes the number of revolutions of the electric drive, for example, increasing the number of revolutions increases the speed of the pumped medium, reduces the back pressure on the formation and helps to clean the bottom of the well and the bottom-hole zone of the reservoir from impurities and returns the well to operating mode, after which the electric drive switches back to work from the industrial network.

Sources of information
1. RF patent N 2050472, MKI 6 F 04 D 15/00, 1991.

 2. The journal "IR". N 1, 1996, p. 20.

Claims (1)

 A device for the operational control of operating modes of electric drive pump units, comprising a system for measuring and generating control signals for electric drives of pumps made with the possibility of sequentially interrogating wells, sensors of parameters of well condition connected to the system, an electric motor shaft speed controller and switching devices configured to receive a command from mentioned systems and designed to connect electric drives to the field network or to the regulator a torus of the frequency of rotation of the motor shaft, characterized in that at the mouth of each well there are installed blocks of generation and reception of acoustic signals, while the generation unit is connected to the output of the measurement and generation of control signals for the electric drives of the pumps, and the reception unit to its input.