Flow-Induced Electrostatic Power Generator for Downhole Use
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Solution Overview
Problem
Current methods for powering downhole electrical devices in oil and gas wells, such as pumps and sensors, rely on cables or batteries, which are inefficient, prone to reliability issues, and require frequent equipment intervention, leading to reduced efficiency and production losses.
Innovation Solution
Harnessing flow-induced electrostatic energy by flowing a non-conductive hydrocarbon-based fluid through isolated tubular segments in oil and gas wells, generating a steady-state electrostatic potential, and using a ground electrode to harvest and power electrical devices downhole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable power supply is used for downhole devices, then electrical power can be continuously supplied, but cable breakage and reliability issues occur
Solution Approach 1:
The patent extracts the power generation function from the cable system and places it directly at the downhole location. The electrostatic power generator is installed downhole to generate power locally from the hydrocarbon fluid flow, eliminating the need for long cables to transmit power from the surface and thus removing the cable breakage problem.
Solution Approach 2:
The downhole system generates its own power using the electrostatic power generator that converts the kinetic energy of flowing hydrocarbon fluids into electrical energy. This self-powered approach eliminates dependency on surface-supplied cables or replaceable batteries, allowing the system to service itself continuously.
2Reliability
If batteries are used for downhole power, then equipment intervention is reduced, but batteries have finite life and require replacement
Solution Approach 1:
The electrostatic power generator provides continuous power generation as long as hydrocarbon fluid flows through the wellbore. Unlike batteries that deplete and require replacement, the generator continuously converts fluid flow energy into electrical energy, ensuring uninterrupted power supply for downhole devices throughout the production life of the well.
Solution Approach 2:
The system uses the naturally flowing hydrocarbon fluids to generate power, eliminating the need for external battery replacement. The generator automatically converts the kinetic energy of the flowing fluid into electrical energy, providing sustained power without human intervention for the duration of fluid flow.
3Reliability
If equipment intervention is performed frequently, then power supply issues are addressed, but production time is lost
Solution Approach 1:
The electrostatic power generator is installed downhole and operates autonomously without requiring periodic surface intervention. It continuously generates power from the flowing hydrocarbons, eliminating the need for wireline operations to replace batteries or repair power systems, thus preventing production downtime entirely.
4Power
If cables are used for power transmission, then power can be supplied from surface, but pressure rating of packers is reduced
Solution Approach 1:
The patent removes the cable transmission requirement by extracting power generation capability and installing it directly downhole. This eliminates the need for cables to pass through packers, thereby maintaining the full pressure rating and integrity of the packer seals without compromising power supply to downhole devices.
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
This method reduces the need for frequent equipment intervention, enhances reliability by providing a continuous power source, and minimizes production losses by utilizing existing hydrocarbon flows to generate electricity for downhole devices.
Implementation Method 1
harnessing flow-induced electrostatic energy in an oil and/or gas well
Implementation Method 2
generating a net, steady-state electrostatic potential between the flowstream and the designated tubular length
Data Source
AI summary
The present invention is directed to processes (methods) for harnessing flow-induced electrostatic energy in an oil and/or gas well and using this energy to power electrical devices (e.g., flowmeters, electrically-actuated valves, etc.) downhole. The present invention is also directed to corresponding systems through which such methods are implemented.