Ring Motor Pump for Downhole Fluid Handling
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Solution Overview
Problem
Conventional pumps with external motors are bulky and restrictive, making them unsuitable for downhole applications in hydrocarbon wells or subsea drilling where space and weight constraints are critical, and they can obstruct fluid flow.
Innovation Solution
An integrated pump design featuring a ring motor with a rotor and stator within the pump casing, where the rotor forms part of the fluid flow path and is supported by dynamic seals, filled with oil for reliability, and connected to a motor-fluid-pressure regulator to maintain pressure and monitor conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a driving motor is arranged outside a pump casing, then the pump can be simpler in structure, but the pump has a large cross section and large volume
Solution Approach 1:
The motor is merged with the pump casing to form an integrated unit. The motor's stator is arranged inside the pump casing, and the motor's rotor forms part of the pump's fluid flow path, combining the motor and pump functions into a single compact structure that reduces overall volume while maintaining functionality.
Solution Approach 2:
The motor components are nested within the pump casing structure. The stator is positioned within the casing, and the rotor is nested within the stator, creating a compact nested arrangement that minimizes the overall pump volume while preserving both motor and pump functions.
2Ease of repair
If a driving motor is arranged outside a pump casing, then the motor can be separately maintained, but the pump has large dimensions and weight
Solution Approach 1:
The pump is divided into separable sections with the motor integrated into one section. This segmentation allows the motor to be accessed and maintained separately from other pump components, facilitating easier repair while the integrated design reduces overall weight compared to external motor arrangements.
3Volume of moving object
If the pump volume is reduced for downhole placement, then the pump occupies less space, but the pump capacity may be reduced
Solution Approach 1:
The motor and pump components are arranged in a compact three-dimensional configuration within the pump casing. The stator is positioned radially and the rotor axially, creating an efficient spatial arrangement that maximizes pump capacity within a minimized volume, enabling effective downhole placement without sacrificing productivity.
4Reliability
If dynamic seals are added to prevent oil leakage, then the pump reliability improves, but the device complexity increases
Solution Approach 1:
The oil-filled motor environment is extracted and isolated from the pump's fluid path using dynamic seals. This separation allows the motor to be filled with oil for improved reliability while the seals prevent oil leakage into the pump fluid, maintaining distinct functional zones with appropriate lubrication for each.
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 minimizes flow restrictions and weight while maintaining reliability and efficiency, allowing for effective pumping of fluids in limited spaces without obstructing fluid flow, suitable for subsea drilling and hydrocarbon well applications.
Implementation Method 1
a stator surrounds the rotor, where armature windings being arranged on an internal wall surface of the pump casing
Implementation Method 2
several permanent magnets are arranged on the external wall surface of the sleeve
Data Source
AI summary
A pump in which an electric motor which is connected to a rotor provided with at least one pump vane is integrated into a pump casing. The electric motor is a ring motor surrounding at least a portion of a fluid flow path through the pump. A stator is arranged internally in an intermediate section of the pump casing and surrounds the rotor. The rotor, which is supported in the pump casing, is cylinder-shaped and forms an intermediate portion of the fluid flow path, and the at least one pump vane is attached internally in the rotor.