Insulated Drill Pipe Assembly for Deep Geothermal Heat Isolation
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Solution Overview
Problem
Existing insulated drill pipes for geothermal drilling face challenges such as heat transfer to drilling fluids, premature failure due to high subsea pressures, and inadequate insulation to prevent overheating.
Innovation Solution
The development of insulated drill pipes featuring an outer drill pipe with torsional properties and an inner tube with insulation, allowing for efficient heat transfer prevention and structural integrity at extreme depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermoplastic insulation is applied by hot wrapping or spray gun, then insulation is provided on the drill pipe, but water cannot pass between the pipe and insulation, causing water pockets to form under high subsea pressure which leads to bursts when the drill pipe is raised to the surface
Solution Approach 1:
The drill pipe system is divided into an outer drill pipe and an inner tube, creating an annular space between them. This segmentation allows water to pass through the annulus rather than being trapped against the insulation, preventing water pocket formation and bursts while maintaining insulation effectiveness.
Solution Approach 2:
The annulus acts as an intermediary space between the drilling fluid and the insulation layer. This intermediate channel allows water to flow through rather than accumulating, resolving the conflict between maintaining insulation integrity and preventing water trapping under pressure.
2Temperature
If insulation is added to prevent heat transfer from the borehole, then drilling fluid temperature control is improved, but the drill pipe structure becomes more complex with additional components
Solution Approach 1:
The inner tube serves multiple functions: it provides a flow path for drilling fluid, supports the insulation layer, and prevents water pocket formation. By combining these functions into a single component, the design achieves effective temperature control without proportionally increasing overall system complexity.
Solution Approach 2:
The inner tube is nested within the outer drill pipe, with the insulation material positioned in the annular space between them. This nested configuration allows the insulation system to be integrated within the existing drill pipe structure rather than adding external bulk, maintaining relative structural simplicity while achieving thermal control.
3Ease of manufacture
If the drill pipe is designed as a single integrated structure, then manufacturing is simpler, but individual sections cannot be serviced separately, reducing life expectancy
Solution Approach 1:
The drill pipe system is segmented into an outer drill pipe and an inner tube that can be assembled and disassembled separately. This segmentation enables individual sections to be serviced, replaced, or inspected independently, extending the overall life expectancy of the drill string while maintaining manufacturing simplicity for each component.
Solution Approach 2:
The coupling system allows the inner tube and outer drill pipe to be dynamically connected and disconnected. This dynamic configuration enables the system to transition between assembled operational state and disassembled service state, facilitating maintenance of individual components without replacing the entire drill string.
4Stability of the object's composition
If the inner tube is securely fixed to the outer drill pipe, then structural stability is improved, but the drill pipe cannot be disassembled for servicing
Solution Approach 1:
The coupling system provides a dynamic connection that is stable during drilling operations but can be easily disconnected for servicing. The coupling maintains structural integrity under operational loads while allowing controlled disassembly, resolving the contradiction between stability and serviceability.
Solution Approach 2:
The coupling system is designed with preliminary features that facilitate easy assembly and disassembly. By incorporating threaded connections or quick-connect mechanisms in advance, the system enables rapid service operations without compromising structural stability during normal use.
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 solution effectively reduces heat transfer to drilling fluids, maintains structural integrity at 7,000 meters true vertical depth, and extends the life expectancy of drill strings by allowing for servicing of individual sections.
Implementation Method 1
an annulus between the inner tubing and the outer drill pipe comprising an insulative material therein to prevent or lessen heat transfer from the exterior of the insulated drill pipe to the interior drilling fluid within the insulated drill pipe
Data Source
AI summary
Insulated drill pipes, couplers and coupling systems for securing an inner (liner) tubing inside of an outer drill pipe, with insulation in between, thread designs for the inner liner tubing, couplers, and outer drill pipe, and methods for assembling insulated drill pipes are described.