Modular Stator Insert Fabrication for Downhole Motor Replacement
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Solution Overview
Problem
Downhole motors in drilling operations face reduced useful life due to particulate matter in drilling fluid, necessitating cost-effective manufacturing and quick replacement solutions for motor components.
Innovation Solution
A method for fabricating a stator insert for downhole motors involving a mandrel with a complementary outer geometry, a flexible sleeve, and a reinforcing material, where the sleeve and mandrel are placed in a mold, the reinforcing material is solidified to bond with the sleeve, and the assembly is coupled to a stator tube using adhesives, allowing for modular replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional stator components are manufactured as single integrated units, then structural strength is maintained, but manufacturing cost increases and replacement time extends
Solution Approach 1:
The stator is divided into two separate components: a stator tube and a stator insert. The stator insert contains the flexible sleeve with reinforcing material and can be manufactured independently, then inserted into the stator tube. This segmentation allows for cost-effective manufacturing of individual components and enables quick replacement of only the worn insert rather than the entire stator assembly.
2Ease of repair
If traditional stator components are designed for durability, then service life is extended, but replacement complexity increases
Solution Approach 1:
The stator insert is designed as a separate, replaceable component that can be easily removed and replaced in the field. The insert contains the flexible sleeve with reinforcing material that is subject to wear, while the stator tube remains in place. This allows for quick replacement of only the worn insert without replacing the entire stator assembly.
Solution Approach 2:
The stator insert is inserted into the stator tube, creating a nested structure where the insert fits within the tube. This nested design allows the insert to be independently replaced while maintaining the outer stator tube structure, simplifying field replacement operations.
3Productivity
If modular stator inserts are used for quick replacement, then maintenance time is reduced, but coupling reliability must be ensured
Solution Approach 1:
The stator insert is pre-assembled with the flexible sleeve and reinforcing material in a controlled manufacturing environment before being installed in the downhole motor. This preliminary assembly ensures proper fit and coupling characteristics are established before field installation, maintaining reliability while enabling quick replacement.
Solution Approach 2:
The stator insert is designed as a replaceable component that can be manufactured at lower cost compared to traditional integrated stators. When the insert wears out, it is replaced rather than repaired, reducing maintenance time and allowing the use of cost-effective materials and manufacturing methods.
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 method enables the cost-effective and efficient fabrication of stator inserts for downhole motors, facilitating quick replacement and improving durability by using a modular design with adhesives for secure coupling, thus extending the motor's useful life and reducing maintenance costs.
Implementation Method 1
a bonding agent may be applied to the flexible sleeve to promote bonding between the flexible sleeve and the reinforcing material
Implementation Method 2
the stator insert assembly to an inner surface of the stator tube. In one aspect this may be accomplished using a an adhesive
Implementation Method 3
The reinforcing material is solidified to thereby bond the reinforcing material and the flexible sleeve
Data Source
AI summary
The present invention recites a downhole motor and method of manufacture wherein a mandrel having an outer geometry that is complimentary to a desired inner geometry for the stator is provided. A flexible sleeve is provided over the mandrel and the flexible sleeve and the mandrel are provided into a mold. Additionally, a reinforcing material is introduced into the mold to fill space between the flexible sleeve and the mold. Said material is then solidified to bond the reinforcing material and the flexible sleeve. The solidified reinforcing material and flexible sleeve are then removed from the mold such that a stator insert is fabricated.