Movable Thermal Conductor for Downhole Tool Temperature Regulation
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Solution Overview
Problem
Downhole tools face challenges in thermal management, as Dewar flasks retain heat in both hot and cold wellbore environments, leading to premature temperature limits and costly, hazardous tripping operations, especially when components like gyroscopes have narrow operating temperature ranges.
Innovation Solution
The implementation of a thermostat system using a first and second solid thermal conductor with a movable actuator that thermally couples or decouples the component from the environment based on temperature, allowing efficient heat transfer or insulation, thereby maintaining optimal operating temperatures without the need for complex cooling systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a Dewar flask is used to maintain component temperature, then heat from the wellbore environment is kept out effectively, but heat generated by components inside the cavity cannot dissipate in cold portions of wellbores, causing progressive temperature increase
Solution Approach 1:
The patent applies a movable thermal conductor that can dynamically change its position between contacting and separated states. When the thermal conductor contacts the Dewar flask, it provides thermal isolation to prevent heat intrusion. When separated, it allows heat dissipation from components. This dynamic mechanism resolves the contradiction by adapting the thermal isolation level based on real-time temperature conditions, enabling both heat prevention and heat dissipation functions.
2Reliability
If the downhole tool is tripped out of the wellbore to cool the Dewar flask or replace it, then component temperature limitations are avoided, but rig time is wasted and costly operations are performed
Solution Approach 1:
The patent implements a self-regulating thermal management system where the movable thermal conductor automatically adjusts its position based on temperature conditions. When components overheat, the thermal conductor moves to enable heat dissipation without requiring external intervention. This self-service mechanism eliminates the need for tripping operations to cool or replace the Dewar flask, resolving the contradiction between reliable temperature management and time loss.
3Temperature
If a fluid circulation system or active cooler is used to selectively cool components, then heat can be transported from the cavity to the wellbore environment, but the system becomes relatively complex and heavy
Solution Approach 1:
The patent extracts the active cooling mechanism from the system by replacing complex fluid circulation systems or active coolers with a passive movable thermal conductor. The thermal conductor's movement alone is sufficient to control heat flow between the cavity and wellbore environment. This extraction of unnecessary complexity resolves the contradiction between effective component cooling and device simplicity.
4Use of energy by moving object
If the second solid thermal conductor is in contact with the first solid thermal conductor, then efficient heat transfer occurs, but thermal insulation is lost; if separated by a gap, then thermal insulation is provided, but heat transfer efficiency decreases
Solution Approach 1:
The patent employs a dynamically adjustable thermal conductor that can switch between contacting and separated states. When contact is made, efficient heat transfer occurs to remove excess heat from components. When separated, thermal insulation is restored to prevent heat intrusion. This dynamic adjustment resolves the contradiction by providing both heat transfer efficiency and thermal insulation at different operational phases.
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 solution effectively extends the duration of downhole tool operations by maintaining component temperatures within optimal ranges, reducing the need for frequent tripping and cooling, and minimizing operational costs and hazards.
Implementation Method 1
a first solid thermal conductor (16) and a second solid thermal conductor (12)... In the first position, a contact surface of the second solid thermal conductor (12) with the first solid thermal conductor (16) has a first non-zero area. Accordingly, in the first position, the second solid thermal conductor (12) may be efficiently thermally coupled to the first solid thermal conductor (16).
Implementation Method 2
In the second position, the gap separating the second solid thermal conductor from the first solid thermal conductor may provide a suitable thermal insulation between the second solid thermal conductor and the first solid thermal conductor.
Implementation Method 3
The actuator is adapted to move the second solid thermal conductor relative to the first solid thermal conductor between the first position and the second position in response to temperature.
Data Source
AI summary
A downhole tool includes a component that may require thermal management and a thermostat. The thermostat is used to thermally couple or decouple the component from an environment of the downhole tool. The thermostat includes a first solid thermal conductor, a second solid thermal conductor, and an actuator mechanically coupled to the first and/or the second solid thermal conductor. The actuator is adapted to move the second solid thermal conductor relative to the first solid conductor in response to temperature.