ESP Motor Control Line Routing via Lamination Slots
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Solution Overview
Problem
Submersible pumping systems face challenges in routing control lines within the limited space of production tubing, where they are vulnerable to damage and interference with the motor and tubing, affecting the efficiency and reliability of electrical submersible pump (ESP) systems in wellbore applications.
Innovation Solution
The ESP system incorporates a three-phase motor with axially aligned slots and channels for routing control lines, which are spaced 120 degrees apart to avoid electromagnetic interference and protect the lines from damage, allowing for efficient power and signal transmission through the motor laminations and downhole elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control lines are routed between the motor and tubing/casing, then control lines can be installed, but they are vulnerable to damage and interfere with motor and tubing space
Solution Approach 1:
The control lines are routed through the hollow interior of the motor shaft, nesting the control lines within the motor structure itself. This eliminates the need for external routing between motor and tubing, protecting control lines from damage while installing them through the motor's internal passage.
2Ease of operation
If control lines are routed between motor and tubing, then control can be achieved, but available space in production tubing is restricted
Solution Approach 1:
By routing control lines through the motor shaft interior rather than in the annular space between motor and tubing, the motor structure is utilized to accommodate control lines. This preserves the full cross-sectional area of the production tubing for its intended fluid flow function.
3Ease of manufacture
If control lines are routed externally, then installation is straightforward, but they are exposed to damage during installation
Solution Approach 1:
The control lines are installed through the motor shaft's internal passage, which acts as a protective conduit. This routing method protects control lines from external damage during installation while maintaining a straightforward installation process through the motor assembly.
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 configuration enhances the operational efficiency of the ESP system by minimizing damage to control lines and maintaining efficient power transmission, enabling reliable fluid pumping and control in wellbore environments.
Implementation Method 1
Motor windings are wound through the slots for receiving three-phase power provided to the motor
Implementation Method 2
At least one set of three control lines extend axially through the motor laminations radially outward from the bore
Data Source
AI summary
An electrical submersible pumping system includes a well fluid pump driven by a three-phase motor. The motor has a stack of motor laminations mounted in a housing. The motor laminations have axially aligned slots spaced circumferentially around a bore. Motor windings are wound through the slots for receiving three-phase power provided to the motor. At least one set of three control lines extend axially through the motor laminations radially outward from the bore and equally spaced around the axis, The control lines may extend through channels on the outer diameter of the motor laminations. The control lines may also extend through the same slots that contain the windings. The control lines extend to a downhole element below the motor for controlling the downhole element.