Marine drift diameter gauge type drill rod or oil pipe leakage flux detection device and detection method

Abstract

The invention relates to a marine drift diameter gauge type drill rod or oil pipe leakage flux detection device and method. The marine drift diameter gauge type drill rod or oil pipe leakage flux detection device is provided with a fishing head and a drift diameter gauge, wherein the drift diameter gauge comprises an excitation coil and a signal acquisition and emission device; the excitation coil is electrified by a lithium battery; the excitation coil is electrically connected to the signal acquisition and emission device; a permanent magnet is arranged between the fishing head and the drift diameter gauge; the magnetic field of the permanent magnet is contrary to the magnetic field of the excitation coil; and the signal acquisition and emission device comprises a leakage flux sensor, an amplification filtering circuit, an A / D (Analog to Digital) conversion circuit, a coder and an electromagnetic wave emitter and is used for acquiring and transmitting flaw signals. The marine drift diameter gauge type drill rod or oil pipe leakage flux detection device has the beneficial effects that the online detection of an oil pipe or a drill rod is realized, the flawed drill rod or the flawed oil pipe is timely rejected; the additional operation cost resulting from drilling troubles caused by descending a well is avoided; and the drill rod or the oil pipe does not need to be transported to the land for detection.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing devices for oil drill pipes or oil pipes, in particular to an offshore drift gauge type drill pipe or oil pipe magnetic flux leakage detection device and detection method. Background technique [0002] Drilling tools are used under harsh conditions. During drilling, they are subjected to various complex alternating stress loads such as tension, compression, torsion, and bending. At the same time, corrosive media such as oxygen, carbon dioxide, and hydrogen sulfide dissolved in drilling mud and oxides in the formation It will seriously corrode the drilling tool, and then produce cracks, punctures, wear and other defects inside the drilling tool. The expansion of cracks often causes damage to the drilling tool, and the puncture and wear will cause the strength of the drilling tool to decrease. Fracture damage of drilling tools. Once the drilling tool breaks and causes the well to be...

AI Technical Summary

Problems solved by technology

At present, the non-destructive testing of offshore pipes is basically carried out after the drilling tools are pulled out and placed on the well site or transported to the land operation preparation base, which requires a special testing site and occupies a large area.

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