PCP Pump Speed Control via Real-Time Inflow Feedback
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Solution Overview
Problem
Current methods for controlling progressive cavity pumps (PCPs) in oil and water wells are inefficient due to reliance on static testing, which requires production halt, and are prone to noise sensitivity and risk of pump damage from high speeds, leading to suboptimal operating conditions.
Innovation Solution
A system and method that continuously monitors and adjusts the pumping speed of PCPs based on real-time measurements of well inflow and outflow rates, slippage, and cavity fillage, using a controller to maintain optimal operating conditions and prevent pump-off states, thereby enhancing efficiency and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static testing methods are used to control PCP speed, then pump damage is prevented, but production efficiency decreases due to required production halts
Solution Approach 1:
The patent transitions from static speed control to dynamic speed adjustment. The controller continuously monitors well inflow rate and adjusts the PCP speed in real-time based on actual production conditions, allowing the system to adapt dynamically rather than relying on predetermined static speed settings
Solution Approach 2:
The system implements a feedback mechanism where the controller receives real-time data on well inflow rate and uses this information to adjust pump speed. This closed-loop control ensures the pump operates at optimal speed while preventing pump-off conditions, eliminating the need for production halts
2Productivity
If high pumping speeds are used to increase productivity, then production rate increases, but risk of pump damage and pump-off states increases
Solution Approach 1:
The controller continuously monitors well inflow rate and uses this feedback to adjust pump speed, ensuring the pump operates at the maximum safe speed without causing pump-off conditions. This real-time adjustment prevents both under-utilization and dangerous over-speeding
Solution Approach 2:
The system dynamically changes the operating speed parameter based on real-time well conditions. By continuously adjusting speed according to actual inflow rate, the system optimizes productivity while maintaining safety margins to prevent pump damage
3Device complexity
If traditional control methods are used, then system complexity is low, but measurement precision and noise sensitivity are problematic
Solution Approach 1:
The system uses continuous feedback from flow rate measurements to control pump speed. By relying on real-time measurement data rather than estimates or manual readings, the system achieves precise control while the feedback mechanism naturally filters out noise through continuous averaging and comparison
Data Source
AI summary
A method of controlling the production efficiency of a well includes determining one or more parameters of a pump model for a pump of the well, determining an inflow rate of liquid into the well, and adjusting a pumping speed of the pump based on the one or more parameters of the pump model to maintain a outflow rate of liquid from the well at a desired fraction of the inflow rate.