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Thread magnetism detector for drilling tool

A magnetic detector and magnetic detection technology, which are applied in electromagnetic measurement devices, electric/magnetic depth measurement, material magnetic variables, etc., can solve the problems of large detection sensors and inconvenience brought to on-site monitoring, difficult to quantify and evaluate detection data, etc. The effect of preventing missed detection, high sensitivity, and eliminating the influence of magnetic field signals

Active Publication Date: 2009-08-05
PETROCHINA CO LTD
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Problems solved by technology

Overcome the inconvenience of carrying the pipe rod thread defect detection sensor to the site for monitoring; and overcome the difficulty in the quantitative evaluation of the detection data when the magnetic particle detector detects the depth of the drill tool thread

Method used

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  • Thread magnetism detector for drilling tool
  • Thread magnetism detector for drilling tool
  • Thread magnetism detector for drilling tool

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1: Taking a portable drilling tool thread magnetic detector capable of detecting 5-1 / 2" external thread defects as an example, the present invention is further described.

[0043] refer to Figure 7 . The portable drill thread magnetic detector is mainly composed of a drill thread magnetizer 1, a drill thread magnetic detection sensor 2, and a computer acquisition and processing system. The drill thread magnetizer 1 adopts a DC excitation coil. The inner diameter of the drill thread magnetizer 1 is 200 mm, the length is 200 mm, and the number of turns is 1000. Put it on the drill joint during detection.

[0044] The magnetic induction element 13 of the drill thread magnetic detection sensor 2 has wires connected to the computer acquisition and processing system, which can store and process the collected electromagnetic signals and display them on the screen.

[0045] refer to image 3 . The drill thread magnetic detection sensor 2 includes an outer ring...

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PUM

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Abstract

A portable threaded magnetic detector for a drilling tool is applied to nondestructive flaw detection of the threaded zone of the drilling tool and is characterized by comprising an outer ring, an inner ring, a crank, a detection probe assembly and two auxiliary probe assemblies. The inner ring and the outer ring can rotate oppositely; the detection probe assembly and the two auxiliary probe assemblies are respectively fixed on one end of the crank; the detection probe assembly comprises a bracket, a threaded framework and a magnetic induction element; a compression spring is fixed at the bottom of a trough of the bracket; the lower surface of the threaded framework is in a threaded tooth shape; and the magnetic induction element is arranged on the threaded framework. The portable threaded magnetic detector can detect the threaded defect intuitively, can perform quantitative analysis, has higher sensitivity than a traditional detection method, and is convenient and reliable to use.

Description

technical field [0001] The invention belongs to the technical field of quantitative non-destructive flaw detection detection of defects in thread regions of oil drilling tools, and belongs to the magnetic nondestructive flaw detection of pipe materials. technical background [0002] Drilling tools are key components for transmitting torque in oil drilling operations. Drilling tools include drill pipes, drill collars, weighted drill pipes, drill tool stabilizers and drill pipe adapters, etc. The drilling tools are connected by threads. Due to the complex stress of the drilling tool in the downhole, fatigue cracks will inevitably occur at the threaded part, which will seriously cause the drilling tool to break, and the drill string below the fracture will fall to the bottom of the well, making drilling impossible. Salvage measures must be taken to salvage the drill string that has fallen into the bottom of the well. Drilling tool breakage brings huge economic losses to dril...

Claims

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Application Information

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IPC IPC(8): G01N27/87G01B7/26
Inventor 贾华明苏建文康宜华卢强丁劲锋祖强迟军刘远杨贾冬花葛保胜武新国赵卫东
Owner PETROCHINA CO LTD
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