Wellhead Drill Pipe Detection Using Combined MFL and EMAT Probes
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Solution Overview
Problem
Existing drill pipe detection methods are inefficient and unable to comprehensively detect various defects, such as longitudinal and transverse defects, in real-time during operation.
Innovation Solution
A magnetic flux leakage and electromagnetic acoustic transducer joint testing device and method that uses a ring structure of detection units with magnetic flux leakage and electromagnetic ultrasonic detection probes, magnetized by an inclined permanent magnet, to detect defects and wall thickness of drill pipes in real-time during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ground detection method is used to transport drill pipe to detection center for inspection, then detection area is large and coverage is comprehensive, but transportation cost is high, detection time cycle is long, and detection efficiency is low
Solution Approach 1:
The patent transitions from ground-based detection to wellhead detection, changing the spatial dimension and location of the detection system. By placing detection devices directly at the wellhead platform, the system enables real-time detection during drill pipe lifting and lowering operations, eliminating the need for transportation to detection centers and significantly improving detection efficiency while maintaining comprehensive defect coverage.
2Productivity
If single detection method is used at wellhead, then detection efficiency is improved, but detection coverage is insufficient and cannot detect all types of defects
Solution Approach 1:
The patent combines multiple detection methods (magnetic flux leakage detection and electromagnetic acoustic transducer detection) into a single integrated wellhead detection system. This merging of different detection technologies enables the system to detect various types of defects including longitudinal defects, transverse defects, and wall thickness changes, achieving both high detection efficiency and comprehensive defect coverage simultaneously.
Solution Approach 2:
The detection system is designed with multi-functional detection units that can perform multiple types of defect detection. The magnetic flux leakage detection probes can detect both longitudinal and transverse defects, while the electromagnetic acoustic transducer detects wall thickness changes, making the system universally applicable for detecting all major defect types in drill pipes.
3Measurement precision
If magnetic memory method is used for vertical damage detection, then stress concentration position can be detected, but cracks, holes and wall thickness cannot be detected effectively and environmental interference is greater
Solution Approach 1:
The patent employs multiple detection methods with different physical principles to detect various defect types. By changing the detection parameters and methods (using magnetic flux leakage for cracks and holes, electromagnetic acoustic transducer for wall thickness), the system overcomes the limitations of single-method detection and achieves reliable detection of all defect types regardless of environmental conditions.
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 solution enables comprehensive and efficient detection of drill pipe defects and wall thickness in real-time, reducing transportation costs and time, and improving detection efficiency.
Implementation Method 1
magnetic flux leakage detection probe is arranged in the second mounting groove
Implementation Method 2
electromagnetic ultrasonic detection probe is arranged in the first mounting groove
Data Source
AI summary
A magnetic flux leakage and electromagnetic acoustic transducer joint testing device for a drill pipe at wellhead, including a mounting table, a limiting frame, a detection mechanism, and a signal processing mechanism. The limiting frame is mounted on the mounting table, and provided with the detection mechanism. A middle of the detection mechanism is provided with the drill pipe. The detection mechanism is connected to the signal processing mechanism. When the drill pipe passes through the detection mechanism when being lifted or lowered within the wellhead, the detection mechanism, integrating a magnetic flux leakage detection probe and an electromagnetic ultrasonic detection probe, will perform overall detection of the drill pipe. A magnetic flux leakage and electromagnetic acoustic transducer joint testing method is further provided.