Pumpjack Linear Alternator for Cable-Free Well Site Power
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Solution Overview
Problem
Existing oil and gas well monitoring systems face challenges with power supply issues due to the need for long, costly cables and battery maintenance, and existing power generation solutions are inefficient or impractical for well site conditions.
Innovation Solution
A linear alternator is mounted on a pump at the well site to convert mechanical work into electrical energy using the up-and-down motion of the pump, powering devices and instruments directly at the site without the need for extensive cabling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power cables are run from motor drive to devices, then power can be supplied to devices, but the well site becomes cluttered and cables are susceptible to wear and damage
Solution Approach 1:
The patent extracts the power generation function from the motor drive location and places it directly at each device location through linear alternators. This eliminates the need for power cables connecting motor drive to devices, removing the harmful factor of cable wear and environmental exposure while maintaining reliable power supply to all devices independently
Solution Approach 2:
Each device is equipped with its own linear alternator that generates power locally using the pump's motion. The system serves itself by converting mechanical energy to electrical energy at the point of use, eliminating dependency on centralized power distribution and cable infrastructure
2Ease of operation
If extremely long cables are used for downhole devices, then power can reach downhole locations, but installation and maintenance costs increase
Solution Approach 1:
The power distribution system is segmented into independent local units. Each device has its own linear alternator module, eliminating the need for one extremely long cable running to downhole devices. This segmentation reduces installation complexity and maintenance costs by creating modular, self-contained power units
Solution Approach 2:
The patent transitions from centralized power distribution (one motor drive to multiple devices) to distributed power generation (multiple linear alternators at device locations). This dimensional change in system architecture eliminates the need for long cables by generating power locally at each device rather than transporting it through long cable runs
3Adaptability or versatility
If battery-operated devices are used, then devices can operate independently, but batteries need regular recharging or replacement
Solution Approach 1:
The linear alternator enables each device to generate its own power continuously from the pump's mechanical motion. This eliminates the need for finite battery supplies that require periodic recharging or replacement, providing indefinite operational duration while maintaining independent device operation
Solution Approach 2:
The system changes the energy supply parameter from finite battery storage to continuous mechanical-to-electrical energy conversion. The linear alternator converts the pump's mechanical energy into electrical energy in real-time, transforming the operational duration from limited battery life to potentially unlimited continuous generation
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
Provides a reliable and cost-effective power source for well site devices, reducing cable clutter and maintenance costs while enabling efficient monitoring and control of pump operations.
Implementation Method 1
The linear alternator uses the up-and-down motion of the pump to drive a linear rotor back and forth in a linear stator to generate power
Data Source
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AI summary
Systems and methods for providing power to devices at a well site employ a linear alternator to generate power at a well site. The linear alternator is mounted on a pump at the well site and uses the up-and-down motion of the pump to generate power. The pump may be a nodding donkey head pump or other sucker rod pump mechanisms that operate based on linear vertical motion. The linear vertical motion drives a linear rotor back and forth through a linear stator to induce current in the linear alternator. This allows the linear alternator to convert a portion of the mechanical work performed by the pump into electrical energy that can be supplied to the devices. In some embodiments, the pump-mounted linear alternator can be equipped with a position sensor to directly measure a vertical position of the pump as the alternator travels up and down with the pump.