Appraisal Well Telemetry via Cable Intermediary
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Solution Overview
Problem
Existing electromagnetic MWD telemetry systems are limited in offshore applications due to signal short-circuiting by salt water and low resistivity of shallow sediments, making them less effective for deep formations and requiring complex electrode placement, which is not commercially viable.
Innovation Solution
A telemetry system comprising downhole devices in multiple wellbores connected by a cable, allowing signal transmission and reception, with electromagnetic telemetry tools using electrodes or magnetometers, and acoustic telemetry for underwater communication, enabling reliable data transmission from appraisal wells to the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If electromagnetic MWD telemetry systems are used in offshore environments, then data transmission capability is improved, but signal reliability deteriorates due to short-circuiting by salt water and low resistivity of shallow sediments
Solution Approach 1:
The patent introduces a cable as an intermediary transmission medium between the appraisal well and the production well. The cable carries signals from the appraisal wellbore through the production wellbore to the surface, avoiding direct electromagnetic transmission through the problematic salt water and low resistivity sediments. This mediator enables reliable data transmission by providing a controlled transmission path that is not subject to the environmental interference affecting free-space electromagnetic propagation.
2Adaptability or versatility
If electromagnetic telemetry tools with electrodes are deployed, then communication capability is improved, but system complexity increases due to complex electrode placement requirements
Solution Approach 1:
The patent extracts the complex electrode placement and electromagnetic transmission function from the offshore environment and relocates it to a controlled cable-based system. By removing the electromagnetic telemetry tools with electrodes from the appraisal well and replacing them with a cable connection to the production well, the system eliminates the need for complex electrode placement while maintaining communication capability. The cable system provides a simpler, more reliable transmission path that does not require precise electrode positioning.
3Adaptability or versatility
If multiple wellbores are instrumented for telemetry, then monitoring coverage is improved, but system complexity and cost increase
Solution Approach 1:
The patent merges the telemetry systems of multiple wellbores by using a shared cable infrastructure. The appraisal well and production well are connected through a common cable system that routes signals to a centralized processing location. This combining approach allows multiple wellbores to be monitored simultaneously while sharing transmission resources, thereby reducing overall system complexity and cost compared to implementing separate telemetry systems for each wellbore.
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
Enables efficient and reliable data transmission from downhole devices to the surface in offshore environments, overcoming the limitations of electromagnetic MWD systems by using a combination of electromagnetic and acoustic telemetry, suitable for high-pressure, high-temperature fields and multiple wellbore communication.
Implementation Method 1
A telemetry system comprising downhole devices in multiple wellbores connected by a cable, allowing signal transmission and reception
Implementation Method 2
acoustic telemetry for underwater communication
Data Source
AI summary
A telemetry system for use in developing a field of wells has a first downhole device capable of transmitting and/or receiving signals disposed in an appraisal well, an electronics control system located at or near the top of the appraisal, a cable disposed in the appraisal well that provides signal communication between the first downhole device and the electronics control system, and a second downhole device capable of transmitting and/or receiving signals disposed in a second wellbore. The signal is passed through the cable between the first downhole device and the electronics control system. From there, the signal may be re-transmitted to a desired location.