Mechanical system of magnetic leakage detector for wellhead drill stem of drilling machine

Abstract

The invention discloses a mechanical system of a magnetic leakage detector for a wellhead drill stem of a drilling machine. The mechanical system comprises a clamp arm device (1) which can be opened or closed and a permanent magnet type probe device (2). In an closing state, the clamp arm device (1) is in a shape of a cylinder and is internally provided with a through accommodation part (11) arranged along axial direction, the drill stem (Z) penetrates through the accommodation part (11) movably, and the accommodation part (11) is internally provided with a probe connecting base (19). The permanent magnet type probe device (2) is arranged on the probe connecting base (19) of the clamp arm device (1), corresponds to the drill stem, and is used for performing magnetic leakage type defect detection for the drill stem. In the embodiment of the invention, since the probe device can detect the drill stem without current, the probe device can be directly applied to the wellhead of the drilling machine and is convenient to use; in addition, the probe device is used for realizing the magnetic leakage defect detection on the drill stem in the tripping operation of the wellhead of a petroleum drilling machine; moreover, the probe is safe and explosion resistant, and the drill stem does not need to be cleaned manually.

Description

technical field [0001] The invention relates to a mechanical system of a drill pipe magnetic flux leakage detector at the wellhead of a drilling rig, which can detect the damage degree of the drill pipe metal on-line. Background technique [0002] During the drilling process, the drill pipe bears various loads such as tension, torsion, vibration, etc., and is subjected to severe friction and erosion of high-pressure mud, and the service conditions are very harsh. Failure to discover cracks, pits, perforations and other defects in the rod body will easily lead to major accidents such as drill pipe breakage and even wellbore scrapping. [0003] Therefore, it is necessary to perform flaw detection on the drill pipe to obtain the damage condition of the drill pipe. So far, factory-type drill pipe flaw detection systems have been widely used to detect the damage of drill pipes. The specific method is to regularly send the drill pipes in use to the professional drill pipe inspect...

AI Technical Summary

Problems solved by technology

[0004] The factory-type drill pipe flaw detection system has the following limitations in application: 1. The reciprocating handling of a large number of drill pipes not only affects the progress of the drilling project, but also increases the cost of the drilling project; 2. For deep wells, ultra-deep wells, offshore drilling, and off-site contracting For long-period engineering projects such as drilling, it is often difficult to send the drill pipe for inspection in time to make it run with damage, which increases the risk of the project; 3. Since the electromagnetic excitation flaw detection device requires a relatively large current, it cannot It is used in flammable and explosive occasions, such as the wellhead of a drilling rig; 4. The drill pipe must be tested for flaws in the horizontal direction, which cannot adapt to the characteristics of the vertical movement of the drill pipe when the wellhead is tripped.

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