Coring Apparatus Strain Sensor Jam Prevention
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Solution Overview
Problem
Existing core sampling methods from subterranean formations often result in jamming or collapse of core samples within the barrel, leading to incomplete retrieval and loss of valuable data, as prior art systems lack effective monitoring capabilities to foresee potential jams and may inhibit the entry of the core sample.
Innovation Solution
A coring apparatus equipped with an outer core barrel, an inner core barrel, and multiple sensors (strain, pressure, rotation, and vibration sensors) that provide real-time data on downhole conditions, allowing operators to monitor and manage the coring operation effectively, including a data memory device for post-retrieval analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a core sample marker (rabbit) is used to monitor core entry, then the distance traveled by the core can be transmitted to the surface, but the rabbit will inherently inhibit the entry of the core sample into the inner core barrel
Solution Approach 1:
The patent removes the core sample marker (rabbit) from the inner core barrel, extracting the harmful element that inhibited core entry. Instead, strain sensors are embedded directly in the inner core barrel wall to monitor core entry without physical obstruction, eliminating the harmful factor while preserving monitoring capability.
Solution Approach 2:
The patent replaces the mechanical core sample marker system with a sensor-based monitoring system. Strain sensors measure the deformation caused by core entry, substituting the mechanical rabbit marker with an electronic sensing system that provides the same information without physical obstruction.
2Loss of information
If prior art monitoring systems are used, then core entry can be monitored, but it is not possible to foresee if a jam is likely to occur
Solution Approach 1:
The patent implements preliminary monitoring of strain, pressure, and rotation parameters to detect early signs of potential jams before they occur. By continuously measuring these parameters and comparing them against threshold values, the system can predict jam conditions and alert operators to take preventive action.
Solution Approach 2:
The patent establishes a feedback system where sensor data is continuously transmitted to the surface, processed, and used to provide real-time information about coring conditions. This feedback loop enables operators to adjust operations based on actual sensor readings, improving the ability to foresee and prevent jams.
3Loss of information
If multiple sensors are installed in the inner core barrel, then real-time monitoring of downhole conditions is enabled, but the device complexity increases
Solution Approach 1:
The patent makes the inner core barrel multi-functional by embedding multiple types of sensors (strain, pressure, rotation) within it. The inner core barrel not only contains the core sample but also serves as the mounting structure for multiple sensing functions, eliminating the need for separate external sensor housings and reducing overall system complexity.
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 monitoring and data collection during coring operations, reducing the likelihood of jamming and improving the quality of core samples by providing operators with critical information to adjust parameters, thus minimizing data loss and enhancing the accuracy of geological and geophysical data collection.
Implementation Method 1
at least one strain sensor adapted to measure strain experienced by the inner core barrel selected from the group consisting of tension and compression
Data Source
AI summary
A coring apparatus including an outer core barrel associated with a drill bit; an inner core barrel adapted to accept a core sample; and at least one strain sensor adapted to measure strain experienced by the inner core barrel selected from the group consisting of tension and compression, wherein an output of the at least one strain sensor is indicative of entry of the core sample into the inner core barrel.