Foamable Polymer Cable Concentricity via Segmented Voids
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Solution Overview
Problem
The existing foamable polymer cable design for oil exploration sites faces issues with concentricity due to a large pneumatic void, which inhibits consistent capacitance and leads to exocentric cables, compromising the integrity of cables used in long lengths.
Innovation Solution
A foamable polymer cable design featuring a conductor with an insulation layer, a foamable polymer layer having a substantially uneven outer surface, and an armor shell applied concentrically, allowing for pressure testing and subsequent foaming to fill pneumatic voids, ensuring concentricity and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large pneumatic void is used in the foamable polymer cable design, then the armor shell can be pressure tested to check weld integrity, but the cable becomes exocentric and capacitance consistency is compromised
Solution Approach 1:
The pneumatic void is segmented into multiple smaller voids distributed around the cable cross-section, rather than one large central void. This segmentation allows the armor shell to be pressure tested for weld integrity while preventing the void from displacing the conductor and armor shell concentrically, thus maintaining cable concentricity and capacitance consistency.
2Strength
If the polymer layer is foamed to fill the pneumatic void, then structural integrity is improved, but the thermal elongation causes inconsistent material dimensions
Solution Approach 1:
The foaming process parameters are controlled and optimized to minimize thermal elongation effects. By carefully managing temperature, pressure, and foaming agent distribution, the polymer layer expands uniformly to fill the segmented pneumatic voids without causing inconsistent dimensional changes in the conductor or armor shell, thus maintaining both structural integrity and dimensional consistency.
3Ease of manufacture
If the fluoropolymer film melting point is exceeded during foaming, then the polymer layer can be foamed to fill the void, but dielectric failure occurs
Solution Approach 1:
The segmented pneumatic voids are created and positioned before the foaming process begins. This preliminary structuring allows controlled foaming to proceed by providing predefined expansion spaces that guide polymer expansion, ensuring the fluoropolymer film remains below its melting point while still achieving complete void filling and maintaining dielectric integrity.
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 design ensures concentricity and maintains structural integrity by allowing the foamable polymer layer to support the armor shell and conductor, achieving consistent capacitance and adequate pullout force, essential for long-length cables in oil exploration.
Implementation Method 1
The pneumatic void 18 allows the armor shell 20 to be pressure tested, such as with a hydrostatic pressure test, to check the weld integrity of the armor shell 20. Once the pressure test is completed, the polymer layer 16 is induced to foam, substantially filling the pneumatic void 18.
Implementation Method 2
The required foaming temperature is often greater than the melting point of the fluoropolymer film 14, which may cause a dielectric failure if the process is not properly controlled. The thermal elongations of the materials that are heated are not consistent either.
Data Source
AI summary
A cable includes a conductor having an insulation layer wrapped substantially about the conductor. A foamable polymer layer is applied substantially about the insulation layer. A cross-section of the foamable polymer layer has a substantially uneven outer surface. An armor shell is applied exterior to the foamable polymer layer. The armor shell is substantially concentric to the conductor.