Polish Rod Powered Drive Assembly for Off-Grid Wellsite Devices
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Solution Overview
Problem
Well sites without access to grid power face challenges in driving devices such as tubing rotators and chemical pumps, as they require a reliable power source for operation.
Innovation Solution
A mechanical drive system that utilizes the linear motion of a polish rod to drive wellsite devices, employing a linear to motive force converter, an actuator coupled to the polish rod, and an arm to transmit the linear motion to the converter, which then outputs a motive force to operate the devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a generator is used to provide power to wellsite devices, then the devices can operate without grid power, but the system requires refueling and considerable maintenance
Solution Approach 1:
The system uses the polish rod's own linear motion to directly drive the wellsite devices through mechanical conversion, eliminating the need for external power sources like generators. The polish rod's up-and-down motion automatically powers the devices without requiring refueling or maintenance of electrical systems.
Solution Approach 2:
The patent replaces the electrical power system (generator) with a direct mechanical drive system. The linear motion of the polish rod is converted to rotational motion through a linear-to-motive force converter, providing mechanical power to the devices without electrical infrastructure.
2Use of energy by moving object
If a generator is used to provide power to wellsite devices, then the devices can operate without grid power, but refueling is required
Solution Approach 1:
The system is self-powered by utilizing the polish rod's existing linear motion. The wellsite devices draw their power directly from the polish rod's up-and-down movement through the mechanical converter, eliminating all refueling operations and associated time losses.
3Productivity
If the polish rod moves up and down to drive the pumping action, then the rod pump operates, but the tubing string experiences wear on its inside surface
Solution Approach 1:
The system incorporates a tubing rotator that rotates the tubing string before and during the pumping action. This preliminary rotation distributes the wear evenly across the inside surface of the tubing string, preventing localized damage from the polish rod's linear motion while maintaining pumping productivity.
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
The drive system effectively operates wellsite devices without the need for electrical or hydraulic power, using the known and controlled motion of the polish rod to drive devices like tubing rotators, ensuring reliable operation and preventing damage to expensive well components.
Implementation Method 1
a linear to motive force convertor including an input for receiving a linear motion drive force and an output for outputting a motive drive force
Data Source
AI summary
A drive assembly for a tubing rotator comprising: a linear force to motive force convertor including an input for receiving a linear motion drive force and an output for outputting a rotary motion drive force, an arm for receiving a linear drive force and inputting it to the linear force to motive force convertor and an actuator couplable to a polish rod and configured for transmitting a linear drive from the polish rod to the arm.