Constant flow control device and method for high-pressure water injection well

Abstract

The invention discloses a constant flow control device and method for a high-pressure water injection well. After a frequency converter (1) receives a starting signal, a motor (2) is dragged to drive a water injection pump (3) to carry out pressurization output; a flowmeter (4) measures the output flow of the water injection pump (3) and outputs a flow signal to the frequency converter (1), a remote transmission device (5) and a digital display meter (7); the frequency converter (1) automatically adjusts the output frequency according to the received flow signal and a set value of the flow and controls the motor (2) to increase or reduce the rotating speed, thereby changing the output flow of the water injection pump (3) to be output in a constant flow; the remote transmission device (5) transmits the received flow signal to a monitoring device (6) to display the production data and operating mode of the water injection pump (3), thereby providing for production users to check in real time; the digital display meter (7) transmits the received flow signal to an electric heating device (8) for the electric heating device (8) to determine a production operating environment and the operating mode, thereby automatically putting into or retreating from the operating. The device and method in the invention can reduce the labor intensity and safety risk of management personnel.

Description

technical field [0001] The invention relates to the technical field of pressurized water injection for oilfield water injection wells, in particular to a constant flow control device and method for high-pressure water injection wells. Background technique [0002] With the further deepening of oilfield development, formation water injection has attracted more and more attention from management personnel. Whether stable and efficient water injection can be guaranteed has become the fundamental factor for maintaining stable and high production. [0003] The control of the on-site water injection pump is usually through the management personnel to set the frequency for the frequency converter, and the frequency converter drives the motor to rotate. The flow rate is realized by the management personnel by adjusting the frequency of the frequency converter. How much depends entirely on the manual adjustment of the management personnel. When the production environment and bottom h...

AI Technical Summary

Problems solved by technology

[0003] The control of the on-site water injection pump is usually through the management personnel to set the frequency for the frequency converter, and the frequency converter drives the motor to rotate. The flow rate is realized by the management personnel by adjusting the frequency of the frequency converter. How much depends entirely on the manual adjustment of the management personnel. When the production environment and bottom hole pressure change, it cannot be adjusted and protected in a timely and effective manner. There is no reliable basis for the control of the frequency converter and the adjustment of parameters, and it cannot be effective for the operating status and production efficiency of the pump. ground control

The instability of production data has greatly increased the dependence on managers, making the labor intensity and safety risks of managers unable to be effectively reduced

[0004] In order to avoid the instability of production data and reduce the labor intensity and safety risks of management personnel, a control technology for water injection pumps is proposed in the prior art, which adopts the mode of frequency converter plus flowmeter control, and the management personnel artificially set a frequency converter The operating frequency value and the flow rate during operation are automatically adjusted by the flowmeter. However, in actual applications, if there are changes in the bottom well pressure and water source pressure, or some problems with the flowmeter itself, the frequency converter cannot normally control the motor speed to control The outlet flow rate of the pump will increase, which will increase the error of water injection, and also bring risks to the personal safety of production equipment and management personnel.

Give the control right to the flow meter. When the bottom hole pressure drops, the flow meter needs to close the diameter. At this time, the inverter will do too much useless work, which will reduce the efficiency and waste electric energy, and the outlet pressure of the pump will increase. If the bottom hole pressure rises, At this time, the flowmeter will fully open the large gate. Since the frequency of the frequency converter is fixed, the flow rate cannot keep up, and there will be situations of insufficient injection or injection failure.

These situations may cause production accidents such as burning of the pump body and personal injury of management personnel.

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