Linear Motor Control Circuit for Submersible Oil Pump Speed Adjustment
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Solution Overview
Problem
Conventional artificial oil lift systems require the entire system to be stopped for adjusting the speed of submersible oil pumps, which is complex and limited to discrete stroke adjustments, and lacks continuous speed control, making it inefficient in responding to changing oil well conditions.
Innovation Solution
A linear motor automatic control circuit assembly connected to a 3-phase linear motor, comprising a CPU, insulated gate bipolar transistor driving circuit, current detection circuit, fluid depth sensor, and function setting and status display circuit, allowing for real-time control of the linear motor's speed based on submergence depth and oil level, enabling continuous speed adjustment and overcurrent protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conventional control method is used to adjust pump speed, then the system can operate with simple control structure, but the speed adjustment is limited to discrete strokes and requires stopping the whole system
Solution Approach 1:
The patent replaces the conventional mechanical control system with an electronic control system using a linear motor. The linear motor directly converts electrical energy to mechanical motion, eliminating the need for mechanical transmission components and enabling continuous speed adjustment through electrical control signals, thus resolving the contradiction between ease of operation and productivity.
Solution Approach 2:
The patent implements dynamic speed control by allowing the linear motor to adjust its operating speed continuously according to real-time oil well conditions. The control system monitors parameters such as oil level depth and automatically adjusts motor speed, transforming the static discrete-speed system into a dynamic continuous-speed system that maintains high productivity while remaining easy to operate.
2Adaptability or versatility
If the pump speed is adjusted to match changing oil well conditions, then the production rate can be optimized, but the conventional system requires stopping the entire system for adjustment
Solution Approach 1:
The patent implements a feedback control system that continuously monitors oil well conditions (such as oil level depth detected by the fluid depth sensor) and automatically adjusts the linear motor speed in real-time. This closed-loop feedback mechanism enables the system to adapt to changing conditions without manual intervention or system stoppage, resolving the contradiction between adaptability and time loss.
Solution Approach 2:
The control system performs self-adjustment by automatically responding to detected changes in oil well conditions. When the fluid depth sensor detects a change in oil level, the CPU automatically modifies the motor speed without requiring operator intervention, enabling the system to serve itself and maintain optimal performance continuously without stopping.
3Productivity
If a linear motor is used for continuous pumping during up stroke and down stroke, then the production efficiency is improved, but the control system becomes more complex
Solution Approach 1:
The patent employs a universal control architecture where the linear motor and its control circuit can handle multiple functions: driving the pump during both up and down strokes, sensing oil level depth, automatically adjusting speed, and providing protection functions. This multi-functional integration reduces overall system complexity despite the advanced capabilities, as a single control system performs what would otherwise require multiple separate systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous and efficient control of the oil pump speed in response to changing oil well conditions, improving production rate balance and preventing motor damage by automatically adjusting based on submergence depth and current values, with integrated safety features for temperature and current protection.
Implementation Method 1
an oil pumping unit using a submersible oil pump driven by a synchronizing three-phase linear motor
Implementation Method 2
the current detection circuit being electrically connected between the CPU and current transformers at a front side of the linear motor power supply circuit
Data Source
AI summary
Connected to a 3-phase linear motor of a submersible oil pump of a crude oil production system, a linear motor automatic control circuit assembly is disclosed to include a linear motor power supply circuit, a CPU, an insulated gate bipolar transistor driving circuit, a current detection circuit, a temperature sensor, a fluid depth sensor, a function setting and status display circuit, and a circuit assembly power supply circuit for controlling the operation speed of the linear motor subject to the submergence depth of the linear motor in the oil well.