Heptacable Wireline Power and Telemetry Transmission
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Solution Overview
Problem
Current power and telemetry signal transmission technologies for downhole applications face challenges in efficiently delivering power and data over long distances in oil and gas wellbores, particularly due to interference and limited capacity, which affects the accuracy and reliability of wireline logging operations.
Innovation Solution
A wireline assembly utilizing a heptacable with six primary conductors and a center conductor, where power signals are transmitted using one propagation mode and telemetry signals using orthogonal modes, allowing for concurrent transmission with reduced cross-talk, and incorporating transformers to facilitate efficient power and telemetry signal delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power and telemetry signals are transmitted over the same cable, then the cable utilization is improved, but signal interference and cross-talk increase
Solution Approach 1:
The patent segments the cable into multiple independent conductor pairs, with each pair dedicated to specific signal types. The heptacable structure divides conductors into separate groups for power transmission and telemetry signals, physically isolating the signal paths to prevent cross-talk while maintaining high cable utilization through multiple parallel channels.
Solution Approach 2:
The patent applies different propagation modes to different conductor pairs within the same cable. Power signals use one propagation mode on specific conductor combinations, while telemetry signals use orthogonal propagation modes on other conductor pairs. This local differentiation of signal characteristics minimizes interference while maximizing the cable's overall capacity.
2Productivity
If multiple signals are transmitted concurrently over the same conductors, then transmission efficiency is improved, but signal accuracy deteriorates
Solution Approach 1:
The patent employs orthogonal propagation modes that operate simultaneously but independently, allowing periodic signal structures to maintain their integrity. The orthogonal nature of the propagation modes ensures that power signals and telemetry signals can be transmitted concurrently without mutual distortion, preserving signal accuracy while achieving high transmission efficiency.
Solution Approach 2:
The patent uses orthogonal propagation modes as intermediaries that mediate between power and telemetry signals. These propagation modes act as separate transmission channels that allow both signal types to coexist on the same physical medium without direct interaction, thereby maintaining signal accuracy while enabling concurrent transmission.
3Power
If power delivery capacity is increased, then energy transmission is improved, but signal interference increases
Solution Approach 1:
The patent segments the conductor system into dedicated power transmission paths and telemetry signal paths. By assigning specific conductor pairs exclusively to power delivery and others to telemetry, the system can increase power capacity without proportionally increasing interference, as the signal paths remain physically separated and use orthogonal propagation modes.
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 enables reliable and efficient transmission of power and telemetry signals over long distances, enhancing the accuracy and reliability of wireline logging operations by minimizing interference and maximizing power delivery capacity.
Implementation Method 1
incorporating transformers to facilitate efficient power and telemetry signal delivery
Implementation Method 2
power signals are transmitted using one propagation mode and telemetry signals using orthogonal modes
Data Source
AI summary
Among other things, a wireline assembly and a technique for providing power to and/or for communicating with one or more tools downhole in a wellbore are provided. The wireline assembly comprises a wireline cable comprising six primary conductors arranged about a center conductor to concurrently transmit power and telemetry signals. A power signal may be transmitted using a first propagation mode and a telemetry signal may be transmitted using a second/different propagation mode. For example, according to the first propagation mode, three adjoining primary conductors provide an active path for a power signal and a different three adjoining primary conductors provide a return path for the power signal, while, according to the second propagation mode, a first pair of primary conductors provides an active path and a second pair of primary conductors provides a return path for the telemetry signal.