Downhole Power Generation via Retractable Flow Restrictor
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Solution Overview
Problem
Providing electrical power to downhole tools in wellbores is challenging due to the difficulty in converting fluid flow energy into electrical energy, especially in straight pipes where flow restrictions are not practical without interfering with tool passage.
Innovation Solution
The use of self-contained electrical power generation assemblies that deploy a flow restrictor to create a pressure drop in the fluid flow, which is then used to operate an electrical generator, allowing for the generation of electrical power in wellbores without the need for wired connections or batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a flow restrictor is deployed to create pressure drop for power generation, then electrical power generation efficiency is improved, but tool passage through the conduit is blocked
Solution Approach 1:
The flow restrictor is designed to be movable between a deployed position (extending into the fluid passageway to create pressure drop) and a retracted position (withdrawn to allow tool passage). This dynamic configuration allows the system to alternate between power generation mode and tool access mode, resolving the contradiction between maintaining continuous power generation and allowing periodic tool passage through the conduit.
Solution Approach 2:
The flow restrictor is retracted in advance before tool passage is required, and deployed in advance when power generation is needed. This preliminary positioning allows tools to pass through the conduit without obstruction, and subsequently enables the flow restrictor to be positioned for optimal power generation without requiring tools to be present during the power generation operation.
2Device complexity
If wired connections or batteries are used to power downhole tools, then electrical power supply is simplified, but device complexity and remote power dependency increase
Solution Approach 1:
The system uses the kinetic energy of the fluid flowing through the conduit to drive the flow restrictor, which in turn drives the electrical generator. This self-service mechanism converts the available fluid flow energy directly into electrical power without requiring external power sources, wired connections, or batteries, thereby simplifying the power supply system while enhancing reliability through independent power generation.
Solution Approach 2:
The system utilizes the hydraulic energy of the fluid flow to rotate the flow restrictor and drive the electrical generator. By harnessing the kinetic energy already present in the fluid stream, the system converts hydraulic energy into electrical energy through the mechanical rotation of the generator components, eliminating the need for separate power supply infrastructure.
Data Source
AI summary
Various examples of self-contained electrical power generation assemblies are described, the assemblies configured to generate electrical power using a flow of fluid flowing through a conduit configured as part of a wellbore tool or wellbore production tubing, the electrical power generation assemblies configured to be located downhole at various positions along a drill string, a section of production tubing, or some other type of conduit configured to provide a fluid passageway for a flow of one or more types of fluid within a wellbore.