Downhole Motor Thread Fastening Structure Sealing
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Solution Overview
Problem
Existing downhole motors experience mud leakage due to poor coupling between threads and other parts, necessitating the use of Teflon tape and epoxy for sealing, which increases costs and complicates the work process.
Innovation Solution
A downhole motor with an improved thread fastening structure featuring threads with ridges at predetermined distances and couplers with corresponding grooves and close-contact surfaces, eliminating the need for Teflon tape and epoxy by enhancing the sealing ability through precise fitting and contact surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thread coupling structure is used, then manufacturing is simple, but sealing ability is poor causing mud leakage
Solution Approach 1:
The patent applies local quality by creating specific ridge structures at the end portions of the thread and corresponding groove structures in the couplers. These localized structural modifications concentrate the sealing function at critical locations (thread-coupler interfaces) rather than requiring complex sealing throughout the entire assembly, thus improving sealing ability while maintaining overall structural simplicity
Solution Approach 2:
The thread structure is segmented into multiple functional zones: ridges at end portions for sealing, intermediate portions for structural integrity, and specific engagement zones with couplers. This segmentation allows each portion to perform its specific function optimally, improving overall sealing performance through distributed sealing points rather than relying on a single complex sealing mechanism
2Reliability
If Teflon tape and epoxy are applied to seal threads, then sealing ability improves, but work process becomes complicated and costs increase
Solution Approach 1:
The thread and coupler structures are designed to be self-sealing through their geometric configuration. The ridges and grooves create inherent sealing interfaces that function automatically during assembly and operation, eliminating the need for external sealing materials like Teflon tape or epoxy. This self-service approach maintains high sealing ability while keeping the manufacturing process simple and cost-effective
Data Source
AI summary
A downhole motor having an improved thread fastening structure is proposed. In the downhole motor, a thread structure disposed therein and having ridges formed at both end portions at a predetermined distance from ends is improved and the internal structures of a first coupler and a second coupler in which the end portions of the thread are respectively inserted and fastened are improved to correspond to the end portions of the thread, thereby being able to improve sealing ability.