A control method for an oil production device of a downhole linear motor double-acting reciprocating pump
A technology of linear motor and oil extraction device, which is applied in AC motor control, pump control, control system and other directions to achieve the effect of reducing system collision, automatically adjusting operating position, and improving service life
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[0026] The operating principle of the control method of the present invention is as follows:
[0027] The working mode of the linear motor double-acting reciprocating oil pump is intermittent, and the plunger of the double-acting reciprocating oil pump can be self-locked when it is not in motion. When the downhole oil production device is working, the working stroke L of the movable part is set by control to be smaller than its maximum stroke L 0 , leave a certain stroke margin ΔS near the upper and lower endpoints of the stroke, that is, L 0 =L+2ΔS, it can ensure that the movable part always runs inside the maximum stroke, so it can ensure that it does not collide with the fixed part.
[0028] When the mover of the linear motor collides with the fixed part, the input current of the linear motor will be distorted, and the characteristics such as the period amplitude of the current will be different from the output set by the control program. According to this feature, the cu...
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