An integrated wellhead detection device for drill string damage

Abstract

The invention relates to an integrated drill stem damage wellhead detection device. The detection device is characterized by comprising a circular ring stand and a detection assembly, wherein the circular ring stand comprises a fixing ring and two opening / closing semi-rings pivoted to two sides of the fixing ring; the fixing ring and the two opening / closing semi-rings encircle to form an openable / closable circular ring structure; the detection assembly comprises a plurality of groups of eccentering mechanisms which are uniformly distributed on the circular ring stand; each group of eccentering mechanisms comprises straight rails, slide blocks, connecting rod seats, connecting rods and a sensor box; the straight rails are fixedly connected onto the circular ring stand; magnetic memory detection sensor chips are packaged in the sensor boxes; two ends of the sensor boxes are respectively hinged with one ends of the two connecting rods; the other ends of the two connecting rods are respectively hinged with the two connecting rod seats; the two connecting rod seats are respectively fixed with the two slide blocks; the two slide blocks are arranged on the straight rails in a sliding manner. The device disclosed by the invention can be moved to the wellhead and connected with the drill stem, and damage of each part of the drill stem is subjected to real-time online monitoring in the tripping process (in the case of non-shackling).

Description

technical field [0001] The invention relates to a wellhead detection device for oil drill string damage, in particular to an integrated wellhead detection device for drill string damage based on magnetic memory detection effect, which belongs to the field of nondestructive detection. Background technique [0002] An oil drill string is basically composed of kelly, drill pipe, drill collars and joints. During the drilling operation, the oil drill string is subjected to various stresses such as tension, torsion, and bending, and is also scoured and corroded by mud, so the service conditions are very harsh. Such harsh service conditions, coupled with long-term drilling service, are likely to cause fatigue cracks, corrosion pits, etc. in the drill string; if there are material defects in the drill string, these defects may become fatigue sources and accelerate the generation and expansion of fatigue cracks , Even the static strength of the drill string will be significantly red...

AI Technical Summary

Problems solved by technology

However, the existing conventional non-destructive testing techniques have obvious deficiencies in the early diagnosis of abnormal stress concentration and microcracks in the threaded parts of drill tool joints.

For example: (1) It is difficult to achieve the good surface contact conditions and coupling medium conditions required for ultrasonic testing in the threaded parts, resulting in very unsatisfactory detection results and not suitable for thread detection of unshackled drilling tools at the wellhead; (2) Magnetic flux leakage Flaw detection technology requires the detection probe to be in close contact with the surface to be tested, and it is impossible to detect wellhead threads without breaking out; (3) In the existing non-destructive stress detection methods, the penetration depth of X-ray diffraction technology is only With tens of microns, it is difficult to touch the root of the thread. Magnetic acoustic emission, Barkhausen noise and magnetic stress detection methods all require electromagnetic excitation conditions (coil). The stress state at the root is difficult to obtain application in thread detection

Existing practice has proved that the existing non-destructive flaw detection technology (such as eddy current, ultrasonic, X-ray, etc.) is more effective for detecting macroscopic defects that have occurred, and it cannot be realized for the detection of wellhead thread detection without shackle

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