Downhole Load Sensor Positioning for Shifting Device Accuracy
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Solution Overview
Problem
Current methods for determining the load on a shifting device in wellbores, especially in deviated or horizontal sections, are inaccurate due to variations in drill string properties and inability to measure loads for multiple sleeves, leading to improper identification of non-functioning sleeves.
Innovation Solution
Incorporating a load-monitoring sensor positioned between a sand control device and a shifting device within a downhole tool, which measures the load when the shifting device contacts a restriction in the wellbore, providing more accurate load measurements by being closer to the shifting device than traditional surface monitoring methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hook load monitoring is used at the surface, then load measurement is possible, but measurement precision deteriorates due to variations in drill string properties and wellbore conditions
Solution Approach 1:
A load-monitoring sensor is positioned within the downhole tool between the sand control device and shifting device, serving as an intermediary measurement point close to the shifting device. This eliminates the need for complex surface hook load monitoring by providing direct load measurements at the source, thereby improving measurement precision without adding significant system complexity.
2Measurement precision
If one-time shear indicators are used in deviated and horizontal wellbores, then load determination is possible, but the ability to measure load for multiple sleeves is lost
Solution Approach 1:
The load-monitoring sensor continuously monitors load throughout the entire shifting process, enabling measurement of load for multiple sleeves as they are sequentially shifted. This continuous measurement capability replaces the one-time shear indicator approach, maintaining measurement precision while adding the versatility to track multiple sleeve operations in real-time.
Solution Approach 2:
The load-monitoring sensor provides continuous feedback on load conditions during sleeve shifting operations. This feedback mechanism enables real-time detection of load changes as each sleeve is shifted, allowing for accurate determination of load for multiple sleeves and identification of non-functioning sleeves through abnormal load patterns.
3Reliability
If load monitoring is performed from the surface, then overall system monitoring is maintained, but measurement precision deteriorates due to drill string property variations
Solution Approach 1:
The load-monitoring sensor acts as an intermediary measurement device positioned within the downhole tool, eliminating the need to transmit load measurement signals through the entire drill string from the surface. This direct measurement approach at the downhole location ensures both system reliability and high measurement precision by avoiding signal degradation from drill string property variations.
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
This approach allows for precise measurement of load differentials when the shifting device engages or shifts sleeves, enabling effective identification of non-functioning sleeves and improving the accuracy of load determination in complex wellbore conditions.
Implementation Method 1
measuring, with the load-monitoring sensor, a load on the downhole tool caused by the contact between the shifting device and the restriction
Data Source
AI summary
A downhole tool includes a sand control device, a tubular member coupled to and positioned below the sand control device, a shifting device coupled to the tubular member, and a load-monitoring sensor coupled to the tubular member and positioned between the sand control device and the shifting device.