Downhole Sensor Flap for Seismic Measurement
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Solution Overview
Problem
Current downhole formation evaluation methods lack efficient mechanisms for real-time measurement of downhole properties, particularly seismic activity, due to limitations in sensor deployment and contact with the wellbore wall.
Innovation Solution
A sensor flap mechanism is introduced, which is operatively connectable to a downhole tool and movable between a retracted and extended position, equipped with a seismic detector to measure seismic activity when in contact with the wellbore wall, activated by fluid flow or magnetic actuators, allowing for precise data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is positioned inside the downhole tool, then the sensor is protected from damage, but the sensor cannot directly contact the wellbore wall to measure seismic activity
Solution Approach 1:
The sensor system is divided into two separate components: a protected sensor housed within the downhole tool and a separate contact element (flap or probe) that extends to touch the wellbore wall. This segmentation allows the sensor to remain protected while still enabling direct contact with the wellbore wall for accurate seismic measurement.
Solution Approach 2:
A contact element such as a flap or probe acts as an intermediary between the protected sensor and the wellbore wall. This intermediary transmits seismic vibrations from the wellbore wall to the sensor, enabling the sensor to measure seismic activity without being directly exposed to the harsh wellbore environment.
2Measurement precision
If the sensor housing is extended to contact the wellbore wall, then seismic activity can be measured, but the sensor housing becomes vulnerable to damage
Solution Approach 1:
The sensor housing is designed to be movable between extended and retracted positions, allowing it to dynamically adjust its exposure level. When extended, it contacts the wellbore wall for measurement; when retracted, it is protected from damage. This dynamic capability resolves the contradiction between measurement and protection.
Solution Approach 2:
The sensor housing can be discarded (retracted) to a safe position within the downhole tool when not in use or when protection is needed, and then recovered (extended) to contact the wellbore wall for measurement. This cycle of discarding and recovering allows the sensor to alternate between protected and measurement states.
3Measurement precision
If a movable sensor housing is used to contact the wellbore wall, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The sensor housing is designed to be self-actuating through fluid flow activation. The flow of drilling mud or other fluids automatically pushes the sensor housing to extend and retract without requiring external actuators or complex control systems. This self-service mechanism reduces device complexity while maintaining measurement capability.
Solution Approach 2:
The sensor housing utilizes fluid flow (hydraulic principle) to activate extension and retraction. The flow of drilling mud or other fluids creates pressure differentials that automatically move the sensor housing between extended and retracted positions, eliminating the need for mechanical actuators or complex control mechanisms.
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 real-time, accurate measurement of downhole properties, including seismic activity, by ensuring consistent contact between the sensor and the wellbore wall, enhancing the effectiveness of formation evaluation processes.
Implementation Method 1
The sensor may include a seismic detector to measure seismic activity when the sensor housing is in contact with the wall of the wellbore
Data Source
AI summary
A sensor flap for a downhole tool. The downhole tool is positionable in a wellbore penetrating a subterranean formation. The sensor flap includes a sensor housing and at least one sensor. The sensor housing is operatively connectable to the downhole tool. The sensor housing is movably positionable between a retracted position in the downhole tool and an extended position in contact with a wall of the wellbore. The sensor is positionable in the sensor housing, and may include a seismic detector to measure seismic activity when the sensor housing is in contact with the wall of the wellbore.