Downhole Tension Sensing with Load Cell and Rectifier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In downhole drilling operations, accurately measuring tension applied to tool strings is challenging due to friction in deviated wellbores, and existing configurations prevent correlation tools from recording data during perforation, making it difficult to verify successful detonation of perforating tools.
Innovation Solution
A downhole tool with a load cell module and electronics module is used to measure tension and detect detonation events, featuring a rectifier to ensure safe operation during perforation and data recording, while allowing accurate tension measurement and verification of tool activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tension is measured at the wellsite surface, then tension monitoring is provided, but friction in deviated wellbores prevents accurate determination of actual tension applied to the tool string
Solution Approach 1:
A downhole tool equipped with a load cell is deployed as an intermediary device within the tool string to directly measure tension at the measurement location. This eliminates the friction interference problem by placing the sensor inside the wellbore where it can directly sense the tension in the conveyance means without external friction affecting the measurement.
Solution Approach 2:
The mechanical tension measurement system at surface is replaced with a downhole load cell that directly measures tension forces. The load cell converts mechanical tension into an electrical signal that can be processed and transmitted to surface equipment, providing accurate tension data despite wellbore friction.
2Reliability
If correlation tools operate on opposite polarity voltage, then safety is enhanced and communication is enabled, but the tools cannot record data during perforation operations
Solution Approach 1:
The voltage polarity system is made dynamic rather than static. The system automatically switches between opposite polarity (for safety and communication) and same polarity (for data recording) based on operational mode. This allows the correlation tools to both enhance safety and record data by adapting the voltage configuration to the current operational requirements.
Solution Approach 2:
The voltage polarity parameter is changed based on operational needs. During normal conveyance, opposite polarity is maintained for safety. During perforation operations, the polarity is switched to match the perforating tool voltage, enabling data recording while maintaining system safety through controlled parameter change.
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 precise tension measurement and verification of perforating tool activation, improving operational safety and data accuracy in challenging wellbore environments.
Implementation Method 1
a load cell connected along a tension-bearing member of the downhole tool and operable to generate a signal indicative of tension applied to the downhole tool
Implementation Method 2
featuring a rectifier to ensure safe operation during perforation and data recording
Data Source
AI summary
Apparatus and method of sensing tension downhole, such as a measurement tool for coupling between opposing first and second portions of a tool string conveyable within a wellbore. The measurement tool may include a tension-bearing member, a load cell connected along the tension-bearing member and operable to generate information indicative of tension applied to the measurement tool, and electronic equipment communicatively connected with the load cell. The electronic equipment may be operable to record the information generated by the load cell and/or transmit the information generated by the load cell to a wellsite surface from which the wellbore extends.