Fluid Pill Cooling for Wireline Logging Tools in Drilling Mud
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Solution Overview
Problem
Wireline logging tools face challenges in dissipating heat due to the confined nature of wellbores and the high viscosity of drilling mud, which can lead to tool damage from excessive heat exposure.
Innovation Solution
The use of a fluid pill, comprising oil-based or water-based coolants with additives, to enhance heat transfer properties, either through convection improvement, thermal conductivity, or endothermic reactions, to cool downhole tools by transferring heat away from the tool towards the wellbore wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireline logging tools operate in residual drilling mud, then the tools can perform post-drilling operations in the wellbore, but the high viscosity of drilling mud greatly diminishes heat dissipation from the tools
Solution Approach 1:
The patent introduces a fluid pill as an intermediary substance between the heat-generating wireline logging tool and the surrounding drilling mud. This fluid pill has superior heat transfer properties compared to the native drilling mud, acting as a mediator that facilitates heat removal from the tool while the tool remains in position performing operations. The fluid pill temporarily replaces or mixes with the surrounding mud to create a localized cooling zone.
2Duration of action of moving object
If the wellbore is a confined space with residual drilling mud, then the tool can operate at depth, but the confined space and mud properties exacerbate tool heating by limiting heat transfer mechanisms
Solution Approach 1:
The patent changes the thermal parameters of the fluid surrounding the tool by introducing a fluid pill with different heat transfer properties. The fluid pill has higher thermal conductivity and/or convection efficiency compared to the native drilling mud. This parameter change is localized to the region around the tool, allowing extended operational duration without exceeding temperature limits, while the rest of the wellbore remains unchanged.
3Power
If high-powered components are used in wireline logging tools, then the tools can obtain desired well information, but these components generate significant heat during operation
Solution Approach 1:
The patent converts the harmful effect of heat generation from high-powered components into a manageable condition by introducing a fluid pill that actively absorbs and transports the heat away from the tool. The heat generated by the powerful sensors and processors is not eliminated but rather redirected toward the wellbore wall through the fluid pill, allowing the high-powered components to continue operating at full capability without thermal damage.
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 fluid pill effectively reduces tool temperature, preventing damage and extending operational time by improving heat dissipation in high-heat environments.
Implementation Method 1
The primary mechanism for transferring heat away from downhole wireline logging tools is natural or free convection
Implementation Method 2
The specific heat and thermal conductivity properties of drilling mud may also be not conducive to the transfer of heat away from wireline logging tools
Implementation Method 3
A fluid pill can also include one or more reactants that are maintained separately but are allowed to mix subsequent to be positioned downhole to produce a localized heat transfer-improving reaction
Data Source
AI summary
A method of cooling at least a portion of a downhole tool located within a drilled wellbore using a fluid pill configured to transfer heat away from a heat-generating segment of the downhole tool. The downhole tool may be a wireline logging tool. The fluid pill can comprise at least one fluid coolant and may include other additives that enable the fluid pill to transfer heat away from a heat-generating segment of the downhole tool even in the presence of one or more fluids present in the drilled wellbore. The fluid pill can be introduced into residual drilling mud in the wellbore, and the downhole tool may thereafter be operated with the heat-generating segment thereof in fluid contact with the fluid pill, whereby heat generated by the heat-generating segment is transferred away from the downhole tool and toward a wall of the wellbore by the fluid pill.