Downhole Rock Sampling Structure for Accurate Multi-Depth Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rock sample extraction devices in boreholes suffer from inaccurate sampling due to improper depth operation and low efficiency, as they operate independently and perform single-point sampling per well depth interval.
Innovation Solution
A rock sample extraction device with a downhole plate and multiple sampling components, each equipped with anisotropic extraction cylinders driven by a power member to perform telescopic movements, allowing simultaneous sampling at multiple depth intervals and points within a well.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent extraction devices are used to sample at different well depths, then sampling coverage is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent combines multiple extraction devices into a single integrated downhole plate structure. The downhole plate carries multiple extraction cylinders (first extraction cylinder and second extraction cylinder) that can simultaneously sample at different well depth intervals, eliminating the need for multiple separate devices and reducing operational complexity.
Solution Approach 2:
The downhole plate is divided into multiple sampling zones with separate extraction cylinders for different well depth intervals. Each extraction cylinder can independently sample at its designated depth, allowing simultaneous multi-point sampling while maintaining a unified device structure.
2Measurement precision
If extraction cylinders are made telescopic with power members, then sampling precision is improved, but device weight increases
Solution Approach 1:
The extraction cylinders are designed with telescopic capability through power members that enable dynamic extension and retraction. This allows the cylinders to reach precise sampling depths and adjust their position as needed, improving sampling precision while maintaining a compact stored configuration that minimizes weight impact.
Solution Approach 2:
The telescopic structure allows the extraction cylinder to nest within itself when retracted, with the power member housed within the cylinder assembly. This nested configuration reduces the overall device weight compared to having multiple separate fixed-length cylinders.
3Measurement precision
If single-point sampling is performed sequentially at different well depths, then sampling accuracy is maintained, but sampling efficiency decreases
Solution Approach 1:
The downhole plate with multiple extraction cylinders enables continuous sampling operations across different well depth intervals simultaneously. While one extraction cylinder is sampling at its designated depth, others are performing sampling operations at their respective depths, eliminating idle time and improving overall sampling efficiency without compromising accuracy.
Solution Approach 2:
The sampling system is segmented into multiple independent extraction cylinders, each responsible for a specific well depth interval. This segmentation allows parallel sampling operations at different locations, transforming sequential single-point sampling into simultaneous multi-point sampling while maintaining the precision of individual sampling points.
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 accurate and efficient multi-point sampling across various well depth intervals, reducing the need for multiple power components and overall device weight, while ensuring smooth downhole operations.
Implementation Method 1
a power member arranged between the anisotropic extraction cylinders, and the power member drives the anisotropic extraction cylinders to perform telescopic movement in opposite directions
Implementation Method 2
outer surfaces of the first extraction cylinder and the second extraction cylinder are provided with threaded grooves; an inner wall of the buckling plate is provided with a stopper inserted in the threaded groove; the first extraction cylinder and the second extraction cylinder are driven by the power member to perform rotary telescopic movement along the inside of the buckling plate
Data Source
AI summary
The present invention discloses a rock sample extraction device, which comprises a downhole plate and a plurality of sampling components uniformly arranged on the downhole plate, wherein the sampling components are used for sampling rock samples in well areas with different depths, and each sampling component is used for sampling at the upper and lower ends of the same well area; each sampling component comprises anisotropic extraction cylinders arranged on the downhole plate and a power member arranged between the anisotropic extraction cylinders, and the power member drives the anisotropic extraction cylinders to perform telescopic movement in opposite directions, so that the anisotropic extraction cylinders can perform sampling operation when extending outwards.