Coring Device Azimuth Control via Nested Hydraulic Rotary Sub
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Solution Overview
Problem
Existing coring instruments are unable to accurately identify the azimuth of cores taken downhole, limiting their ability to drill cores in specific azimuths, which is crucial for understanding downhole heterogeneous formations.
Innovation Solution
A coring instrument comprising an electronic sub for azimuth identification, a rotary sub for rotating the mechanical sub to specified azimuths, a hydraulic control sub for powering the rotary and mechanical subs, and a support arm sub for fixing the instrument's position, allowing for accurate azimuth measurement and core drilling at desired angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional coring instruments are used, then coring operations can be completed downhole, but the azimuth of the cores cannot be accurately identified
Solution Approach 1:
The patent integrates multiple functional modules (electronic sub, rotary sub, hydraulic control sub, mechanical sub, core reserving drum sub) into a nested hierarchical structure where each module contains specialized components. For example, the rotary sub includes a rotating shaft, moving sleeve, and fixed shell with threaded connections, creating a compact nested arrangement that achieves azimuth measurement and control without excessive overall complexity.
Solution Approach 2:
The coring instrument is designed as a multi-functional integrated system that simultaneously performs coring operations, azimuth measurement, azimuth adjustment, and core retrieval. The electronic sub communicates with ground control systems to identify azimuth, while the rotary sub adjusts the mechanical sub to specified azimuths, allowing a single instrument to accomplish multiple tasks that would otherwise require separate devices.
2Adaptability or versatility
If azimuth identification capability is added to coring instruments, then cores can be drilled in specified azimuths, but the device complexity increases
Solution Approach 1:
The patent employs a hydraulic control sub that provides power to both the rotary sub and mechanical sub through hydraulic fluid transmission. The hydraulic system enables precise control of the rotary mechanism for azimuth adjustment and the mechanical sub for coring operations, replacing what would otherwise require complex mechanical linkages and control mechanisms.
Solution Approach 2:
The patent replaces traditional mechanical azimuth measurement and control systems with an integrated electronic-hydraulic system. The electronic sub communicates with ground control systems to electronically identify azimuth, and the hydraulic control sub translates these electronic signals into mechanical rotation of the rotary sub, substituting pure mechanical systems with a more efficient electromechanical-hydraulic integration.
3Ease of operation
If the rotary sub uses threaded connection between moving sleeve and rotating shaft, then axial movement is achieved, but the structure becomes more complex
Solution Approach 1:
The threaded connection between the moving sleeve and rotating shaft creates a self-converting mechanism where hydraulic axial force is automatically transformed into rotational motion. The hydraulic control sub injects hydraulic oil to push the moving sleeve to move axially, and the threaded engagement with the rotating shaft automatically converts this linear motion into rotation, eliminating the need for separate motors or gear mechanisms.
Solution Approach 2:
The patent utilizes the change in motion parameters from linear to rotational through the threaded connection. The hydraulic system generates axial force that moves the sleeve linearly, and the threaded geometry transforms this linear displacement into rotational displacement of the rotating shaft, effectively changing the motion parameter to achieve the desired azimuth adjustment.
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
The instrument enables accurate measurement and adjustment of azimuth during coring, providing more precise formation data, enhancing reservoir evaluation, and increasing the utility value of the cores taken.
Implementation Method 1
the hydraulic control sub is configured to inject hydraulic oil into the fixed shell through the oil inlet to push the moving sleeve to move axially
Data Source
AI summary
A coring device, comprising an electronic sub communicated with a ground control system and identifying the position of a core taken underground, a supporting arm sub for fixing the coring device, a rotating sub for rotating a mechanical sub to a specified position to carry out coring by rotating, a hydraulically controlled sub for providing power to the rotating sub and the mechanical sub, a mechanical sub for performing pushing, coring, core folding and core length measurement operations, and a core storage barrel sub for storing a taken core, which are sequentially connected. The rotating sub comprises a rotating shaft, a moving sleeve which sleeves the rotating shaft and is in threaded connection with the rotating shaft, and a fixed housing; the rotating shaft and the moving sleeve are arranged inside the fixed housing, two ends of the rotating shaft respectively extend from two ends of the fixed housing.