Wellhead detection unit for drilling tool screw thread stress conditions

Abstract

A wellhead detection unit for drilling tool joint screw thread stress conditions belongs to the field of nondestructive testing, and comprises a drilling tool joint screw thread detection device, a linear guide rail, a drilling tool joint outer-diameter centering mechanism, a bearing trolley, a power source and an instrument control box; the drilling tool joint outer-diameter centering mechanism comprises a positioning rod flange base, a centering shaft and a centering clamp, and the positioning rod flange base is fixed on a supporting plate, the centering clamp is fixed onto the centering shaft through a screw, the centering shaft is inserted into a stroke hole of the positioning rod flange base; the drilling tool joint screw thread wellhead detection device comprises a rib plate, a conversion block, a main shaft, a copper sleeve, a positioning pin shaft, a rotating ring, a bearing screw, a flange linear bearing, a through-wall sealing joint, a steel ring cover plate, an umbrella rod disk, an umbrella rod, a steel ring, a swing rod, a sensor seal box and a sealing joint; the wellhead detection unit for drilling tool joint screw thread stress conditions is stable in the structure, high in structural strength, abrasion resistant, fast in detection speed, high in detection precision, and capable of realizing fast and accurate screw thread detection of large scale joints.

Description

technical field [0001] The invention relates to a wellhead detection device applied to the thread stress condition of a drill tool joint. It has strong applicability to detect the internal thread from the outer wall of the drill tool joint while satisfying the detection of the external thread from the outer diameter of the drill tool joint. The high-efficiency thread stress state detection tool required for drilling use can accurately detect and evaluate the thread stress state of wellhead drill tool joints, and belongs to the field of nondestructive testing of drilling tools. Background technique [0002] At present, one of the main manifestations of drilling tool failure is the fracture and damage of the connecting thread part. The fracture crack of the external thread joint often occurs at the root of the second or third thread from the step, and the fracture crack of the internal thread joint often occurs at the At the turnbuckle of the last part to engage. The thread p...

AI Technical Summary

Problems solved by technology

Due to the relatively complex geometric structure and large wall thickness of the threaded part, the existing conventional non-destructive testing techniques are obviously insufficient in the early diagnosis of abnormal stress concentration and microcracks in the internal threaded part of the drilling tool.

[0003] For example: (1) The good surface contact conditions and coupling medium conditions required for ultrasonic testing are difficult to achieve in the threaded part, resulting in very unsatisfactory testing results;

[0004] (2) Magnetic flux leakage detection technology requires the detection probe to be in close contact with the surface to be tested, and its detection effect is greatly limited in thread parts with relatively complex geometric structures;

[0005] (3) Among the existing non-destructive stress detection methods, the penetration depth of X-ray diffraction technology is only tens of microns, and it is difficult to touch the root of the internal thread. Magnetoacoustic emission, Barkhausen noise and magnetic stress detection methods all require electromagnetic The excitation condition (coil), the combined structure of the excitation coil and the detection probe is too large, it is impossible to distinguish the stress state of the variable diameter point and the root of the internal thread, and it is difficult to obtain application in thread detection

[0006] Existing practice has proved that the existing non-destructive testing techniques (such as eddy current, ultrasonic, X-ray, etc.) are more effective in detecting the macroscopic defects that have appeared, but they cannot detect the fatigue damage from the source of fatigue damage (microscopic defects and stress concentration areas). Make an early assessment of the technical status of the drilling tool to prevent accidental damage to the drilling tool

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