Gap Sub Assembly Electrical Isolation Locking Ring
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Solution Overview
Problem
Existing gap sub assemblies in drilling systems face challenges in providing simultaneous robust mechanical strength, predictable electrical isolation, and ease of maintenance, especially in varying drilling environments.
Innovation Solution
A gap sub assembly comprising tubular members with anti-torsion features and a locking ring, where the gap between components is filled with electrical isolation material, such as epoxy or plastic, to ensure reliable and durable electrical isolation, while the locking ring provides anti-torsion and torque resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical isolation material is used to provide electrical isolation between tubular members, then electrical isolation performance is improved, but mechanical strength and structural robustness deteriorate
Solution Approach 1:
The gap sub assembly is divided into separate tubular members (first tubular member and second tubular member) that are electrically isolated from each other by electrical isolation material. This segmentation allows each member to maintain its structural integrity while achieving electrical isolation between them, resolving the contradiction between electrical isolation performance and mechanical strength.
2Ease of manufacture
If a simple gap sub design is used to reduce manufacturing complexity, then ease of manufacture is improved, but mechanical strength and reliability in drilling environments deteriorate
Solution Approach 1:
The locking ring serves multiple functions simultaneously: it provides mechanical locking between tubular members, resists torque and tension forces, and helps maintain the structural integrity of the gap sub assembly. This multi-functionality allows a relatively simple component design to achieve high mechanical strength and reliability without complex manufacturing processes.
3Reliability
If robust and predictable electrical isolation is achieved through complex assembly procedures, then electrical isolation reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Electrical isolation material is applied to the exterior surface of one tubular member before the threading and assembly process. This preliminary application of electrical isolation material ensures reliable electrical isolation is achieved as part of the standard assembly procedure, rather than requiring complex additional isolation steps after assembly, thus maintaining both reliability and manageable complexity.
Data Source
AI summary
A gap sub assembly and methods for using the gap sub provide an electrical isolating joint that is mechanically strong enough to withstand the rigors of drilling environments, resistant to environmental effects (heat, corrosive liquids and gases, and high pressures), and maintainable. The gap sub assembly provides a male member and a female member that may be connected together, wherein a non-conductive material is applied between the two at the attachment points. A locking ring or collar affixes to both male and female members to prevent back off while drilling and preserving the electrical isolation of the gap joint. Non-conductive material may be injected between the locking ring and one or more of the male or female members.