Drilling tool damage wellhead detection device

Abstract

The invention provides a detection device for a well mouth damaged by a drilling tool. The detection device comprises an opening and closing mechanism and a plurality of pushing and abutting mechanisms, wherein the opening and closing mechanism is provided with a fixed ring, and the two sides of the fixed ring can be connected with two opening and closing semi-rings in an opening and closing mode; the pushing and abutting mechanisms are uniformly distributed on the fixed ring and the two opening and closing semi-rings, each pushing and abutting mechanism is provided with a slide rod; each slide rod is telescopically connected with a sensor box for accommodating a sensor in the radial direction. According to the detection device for the well mouth damaged by the drilling tool, provided by the invention, connection threads of the meshed drilling tool can be detected under the condition of no shackling, the defects at the roots of screw threads of the drilling tool and the condition of stress concentration can be discovered, and the operation is convenient and reliable.

Description

technical field [0001] The invention relates to a drilling tool damage wellhead detection device, in particular to a drilling tool damage wellhead detection device in the field of non-destructive testing. Background technique [0002] At present, one of the main manifestations of drilling tool failure is fracture and damage at the connecting thread. Fracture cracks of externally threaded joints often occur at the root of the second or third thread from the shoulder. The external thread part becomes the weak link of the drill tool that is prone to damage due to its geometric structure and the stress concentration effect at the root of the thread, which makes it easy to initiate fatigue cracks under the action of compound alternating stress and expand under the action of cyclic stress and corrosive media. until it breaks. [0003] The fracture crack of the internal thread of the drill tool joint often occurs at the thread of the last meshing part. The stress concentration ef...

AI Technical Summary

Problems solved by technology

This not only increases the difficulty of detection equipment, detection operation and data processing and analysis, but also seriously affects the wellhead tripping speed, which has a great impact on oil well production

[0005] Existing conventional non-destructive testing techniques have the following deficiencies in the early diagnosis of abnormal stress concentration and microcracks in the threaded parts of drill tool joints: (1) The good contact conditions of the tested surface and the coupling medium conditions required for ultrasonic testing are difficult to obtain in the threaded parts. However, the detection effect is very unsatisfactory and it is not suitable for the detection of drilling tool threads without breakout at the wellhead; (2) The magnetic flux leakage flaw detection technology requires the detection probe to be in close contact with the surface to be tested, which is not possible for the detection of wellhead threads without breakout (3) In 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 thread. Magnetic acoustic emission, Barkhausen noise and magnetic stress detection methods are all Electromagnetic excitation coil is required, the combined structure of excitation coil and detection probe is too large, and the stress state of the variable diameter point and the root of the thread cannot be distinguished, so it is difficult to obtain application in thread detection

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

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