Downhole Contact Module Pressure Sealing
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Solution Overview
Problem
The process of sealing and unsealing downhole devices for drilling operations is time-consuming and costly, posing challenges in efficiently retrieving and reusing measurement while drilling (MWD) tools due to their exposure to harsh environments and high pressures.
Innovation Solution
A system featuring a contact module with external electrical contacts and insulators that allows for secure communication with downhole devices, maintaining mechanical integrity and preventing fluid interference, enabling communication through various protocols like CAN, RS232, and RS485 while being pressure-sealed to withstand drilling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the downhole device is sealed and unsealed repeatedly for retrieval and reuse, then the device can be reused multiple times, but the process is time-consuming and costly
Solution Approach 1:
The system is divided into two main segments: a surface connector that remains on the surface and a contact module that travels downhole with the MWD tool. This segmentation allows the surface connector to be reused indefinitely while only the contact module needs to be retrieved and resealed, significantly reducing the sealing/unsealing frequency and time required.
Solution Approach 2:
The contact module acts as an intermediary between the surface connector and the downhole MWD tool. It provides electrical communication functionality while being isolated from the harsh downhole environment through pressure sealing, allowing data transmission without requiring the MWD tool itself to be opened or sealed.
2Adaptability or versatility
If the downhole device is exposed to harsh environments and high pressures, then the device can perform measurements while drilling, but the device requires frequent sealing and unsealing
Solution Approach 1:
The contact module serves as a protected intermediary that interfaces with the MWD tool through a sealed connection. It handles electrical communication while being pressure-sealed against the harsh downhole environment, preventing drilling fluids from contaminating the electronics and eliminating the need to open the MWD tool for data retrieval.
Solution Approach 2:
The patent replaces the traditional mechanical electrical connection system (which would require opening the tool) with a pressure-sealed electrical interface. The contact module uses insulated electrical contacts that maintain electrical connectivity while being protected by pressure seals, substituting mechanical opening/closing operations with a sealed electrical interface.
3Ease of operation
If electrical contacts are exposed to drilling fluids, then communication can be established, but fluid interference causes short circuits
Solution Approach 1:
The contact module acts as a sealed intermediary that establishes electrical communication between the surface and downhole devices while protecting the electrical contacts from drilling fluids. The pressure seals create a barrier that prevents fluid ingress to the electrical interface, eliminating short circuit risks while maintaining communication functionality.
Solution Approach 2:
The electrical communication function is extracted from the main MWD tool body and placed into a separate contact module. This extracted electrical interface can then be pressure-sealed independently, isolating the electrical contacts from harmful drilling fluids while allowing the MWD tool to continue its measurement functions uninterrupted.
4Reliability
If the contact module is pressure sealed to prevent fluid ingress, then electrical contacts are protected, but the structure becomes more complex
Solution Approach 1:
The patent uses flexible pressure seals (such as elastomeric O-rings or similar sealing elements) to create a compact and simple pressure barrier around the electrical contacts. These flexible sealing elements can conform to the contact module geometry without requiring complex rigid sealing structures, maintaining simplicity while providing reliable fluid protection.
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
Facilitates efficient communication and data retrieval from downhole devices, reducing operational costs and time by maintaining the mechanical integrity of the drill string during lifting and lowering, and preventing fluid interference that could cause short circuits.
Implementation Method 1
at least one insulator that electrically insulates the at least one external contact from other parts of the system
Implementation Method 2
one or more seals situated between the one or more insulators and the at least one external contact to pressure seal the system from external fluids
Data Source
AI summary
A system including a tool drill string having a downhole device. The system includes at least one external contact to be electrically coupled to the downhole device to communicate with the downhole device, one or more insulators that electrically insulate the at least once external contact from other parts of the system, and one or more seals situated between the one or more insulators and the at least one external contact to pressure seal the system from external fluids.