Metal-Jacketed Power Cables for Corrosion-Resistant ESP Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrical submersible pumps (ESPs) in wellbores face premature failures due to corrosion from sour and corrosive fluids, and existing power cable connectors through wellbore seals can lead to inefficiencies and increased maintenance costs.
Innovation Solution
The implementation of a downhole pumping system with primary and secondary power cabling, each fully encapsulated in a metal jacket, including stainless steel, to isolate electrical connections from corrosive fluids and provide a backup power source, reducing exposure to corrosive environments and enabling continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power cables use rubber-to-metal connectors through wellbore seals, then installation is simpler, but corrosion from sour and corrosive fluids causes premature failures
Solution Approach 1:
The patent extracts the electrical connection from the corrosive downhole environment by positioning the power connector in the annulus above the wellbore seal, where corrosive fluids cannot reach. This separates the vulnerable rubber-to-metal connector interface from the corrosive zone, eliminating corrosion-related failures while maintaining installation simplicity.
Solution Approach 2:
The patent introduces a metal-to-metal power connector as an intermediary component that eliminates the need for rubber-to-metal connections. This intermediary connector provides both electrical conductivity and corrosion resistance, serving as a mediator between the power source and motor while resisting corrosive fluid attack.
2Device complexity
If ESP components are exposed to corrosive wellbore environment, then system complexity is reduced, but operational life decreases due to deterioration
Solution Approach 1:
The patent employs a disposable power connector design positioned in the annulus that can be easily replaced during workovers. This connector is designed for simple installation and replacement, allowing rapid exchange without requiring complex retrieval operations, thus extending overall system operational life through easy maintenance.
Solution Approach 2:
The patent segments the electrical power transmission system into distinct zones: the power source cable remains in the corrosive environment but is protected by its own sealing, the power connector is positioned in the non-corrosive annulus zone, and the motor power cable extends to the motor. This segmentation isolates critical components from corrosion while maintaining system simplicity.
3Ease of manufacture
If power cables are not fully encapsulated in metal jacket, then manufacturing cost is lower, but exposure to corrosive fluids increases failures
Solution Approach 1:
The patent applies local quality by providing metal jacket encapsulation only where it is most critical - on the power source cable in the corrosive environment and on the motor power cable near the motor. The power connector in the intermediate annulus zone uses a different protection strategy, optimizing overall corrosion resistance while controlling manufacturing costs through selective application of protective measures.
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 extends the operational life of ESP systems, reduces premature failures, and minimizes shutdowns by maintaining production without the need for rig-based ESP replacement, thus lowering maintenance and operational costs.
Implementation Method 1
each of the pump power cable and the power source cable including a metal jacket that encapsulates the respective cable
Data Source
AI summary
A downhole pumping system includes a downhole pump that includes a motor and is configured to circulate a downhole fluid from a subterranean reservoir to a terranean surface; a production tubing string positioned in the wellbore from the terranean surface to the subterranean reservoir and fluidly coupled to the downhole pump; a wellbore seal positioned in the wellbore and configured to fluidly isolate a first portion of an annulus that is uphole of the downhole pump from a second portion of the annulus in which the downhole pump is positionable; and a pump power cable electrically connected to the motor and to a power source cable in the first portion of the annulus with a power connector, where each of the pump power cable and the power source cable includes a metal jacket that encapsulates the respective cable.