CN-121994911-A - Method for judging crack extension of wear-resistant belt of drill pipe joint into pipe body

CN121994911ACN 121994911 ACN121994911 ACN 121994911ACN-121994911-A

Abstract

The invention discloses a judging method for a crack extending into a pipe body of a wear-resistant belt of a drill pipe joint, which comprises the steps of manufacturing a comparison sample containing a manual notch, preprocessing the surface of the wear-resistant belt, checking the detection sensitivity of a magnetic powder flaw detector based on the surface of the wear-resistant belt, carrying out magnetic powder detection on the surface of the wear-resistant belt by using the magnetic powder flaw detector, marking crack defect positions, checking the detection sensitivity of an ultrasonic flaw detector by using the comparison sample, detecting the crack defect positions by using the ultrasonic flaw detector through a secondary wave method to obtain the crack defect suspected to extend into the pipe body, comparing the echo position of the suspected crack defect with the echo position of the manual notch during checking the detection sensitivity, and finally judging. The invention has the advantages of higher detection efficiency, easy operation, accurate and reliable discrimination result, important practical significance in the aspects of drilling safety, drill rod residual life assessment, drilling efficiency and the like, and can be widely used in mineral production enterprises such as oilfield enterprises, coal and the like.

Inventors

LUO HUAQUAN
BAI XIAOLIANG
LIU WENHONG
WEI ZUNYI
ZHANG YIMING
YANG LINENG
YANG SU
LOU QI

Assignees

中国石油天然气集团有限公司
中国石油集团工程材料研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (8)

1. The method for judging whether the crack of the wear-resistant belt of the drill pipe joint extends into the pipe body is characterized by comprising the following steps of: Step1, manufacturing a special contrast sample for ultrasonic detection of a drill pipe joint wear-resistant belt comprising artificial grooving according to the material and specification of a drill pipe joint pipe body; step2, preprocessing the surface of the wear-resistant belt until the surface meets the magnetic powder detection requirement; Step 3, checking the detection sensitivity of the magnetic particle inspection instrument based on the surface of the wear-resistant belt; step 4, carrying out magnetic powder detection on the surface of the wear-resistant belt by adopting a magnetic powder flaw detector, and marking crack defect positions; Step 5, checking the detection sensitivity of the ultrasonic flaw detector by using the comparison sample obtained in the step 1; Step 6, detecting the crack defect part obtained in the step 4 by adopting an ultrasonic flaw detector through a secondary wave method to obtain a suspected crack defect extending into the pipe body; And 7, comparing the echo position of the suspected crack defect with the echo position of the manual notch during detection sensitivity verification in the step 5, and finally judging.
2. The method for judging whether the wear-resistant belt crack of the drill pipe joint extends into the pipe body according to claim 1, wherein the comparison sample in the step 1 is a drill pipe joint pipe body which is the same as the material and the specification of the pipe body of the drill pipe joint to be detected, and manual notch grooves are formed in the circumferential direction on the outer wall of the selected pipe body.
3. A discriminating method for extending crack of abrasion-resistant belt of drill pipe joint into pipe body, characterized in that step 3 is that portable electromagnetic yoke flaw detector is selected as magnetic flaw detector, A-type or C-type sensitive test piece is stuck on the edge of abrasion-resistant belt, groove surface of test piece is stuck to pipe body, test piece position is located on the edge of effective magnetization area of magnetic flaw detector, contrast enhancer is sprayed on test piece surface uniformly, after contrast enhancer is dried, magnetic drill pipe joint sensitivity checking area is magnetized, black magnetic powder magnetic suspension is sprayed on surface, when the groove magnetic mark on test piece is displayed clearly, the checking of detecting sensitivity is qualified, otherwise, it is readjusted to checking of detecting sensitivity is qualified.
4. A method for judging whether the crack of the wear-resistant belt of the drill rod joint extends into a pipe body is characterized in that the step 3 is characterized in that a portable electromagnetic yoke flaw detector is selected as the magnetic particle flaw detector, an A-type or C-type sensitivity test piece is attached to the edge of the wear-resistant belt by using an adhesive tape in an environment with white light illumination lower than 20lx, the notch surface of the test piece is tightly attached to the pipe body, the test piece is positioned at the edge of an effective magnetization area of the magnetic particle flaw detector, fluorescent magnetic suspension is sprayed on the surface of the test piece while the sensitivity check area of the drill rod joint is magnetized, the area to which the test piece is attached is irradiated by a black light lamp, the notch on the test piece is clearly displayed to indicate that the detection sensitivity check is qualified, and otherwise, the test piece is readjusted to the detection sensitivity check is qualified.
5. The method for judging whether the crack of the wear-resistant belt of the drill pipe joint extends into the pipe body according to claim 1 is characterized in that the step 4 is specifically that a magnetic particle inspection instrument is started, the pipe body and the wear-resistant belt are magnetized by adopting a cross magnetization method for 1-3 s, meanwhile, magnetic suspension is sprayed on the wear-resistant belt, the magnetic mark display condition on the wear-resistant belt is observed, and if the crack defect display is found, the crack defect position is marked.
6. The method for judging whether the abrasion-resistant belt crack of the drill pipe joint extends into the pipe body according to claim 1, wherein the step 5 is characterized in that a couplant is uniformly smeared on the pipe body according to the position of the manual notch on the comparison sample obtained in the step 1, and an ultrasonic flaw detector is a digital ultrasonic flaw detector, and the K value of an ultrasonic probe is selected as follows: Wherein L is the width of the wear-resistant belt, L0 is the front length of the ultrasonic probe, and t is the wall thickness of the pipe body; the ultrasonic probe moves forwards and backwards in a zigzag manner along the axial direction of the pipe body until the highest echo of the manual notch is found, the gain value of the ultrasonic flaw detector is adjusted to enable the echo height to reach 80% of the instrument screen height, and the detection sensitivity verification of the ultrasonic flaw detector is completed.
7. The method for judging whether the crack of the wear-resistant belt of the drill pipe joint extends into the pipe body according to claim 6, wherein the step 6 is characterized in that the crack defect position obtained in the step 4 is detected through a secondary wave method, the ultrasonic checking sensitivity is improved by 6dB, a couplant is uniformly smeared on the outer surface of the pipe body between a position I and a position II, the position I and the position II are respectively ultrasonic initial wave positions where the secondary waves just contact two ends of the wear-resistant belt, scanning is conducted in the front-back direction and the circumferential direction of the pipe body, and if a defect echo is found, the echo height is still 80% higher than the screen height of an ultrasonic flaw detector after the detection sensitivity is reduced by 6dB, and otherwise, the crack defect is judged to not extend into the pipe body.
8. The method for determining whether the crack extends into the pipe body of the wear-resistant zone of the drill pipe joint according to claim 7, wherein the step 7 is specifically that the echo position of the suspected crack defect is compared with the echo position of the manual notch during the detection sensitivity verification in the step 5, if the echo of the suspected crack defect occurs before the echo of the manual notch, the crack defect is determined to extend into the pipe body, and if the echo of the suspected crack defect occurs after the echo of the manual notch, the crack defect is determined to not extend into the pipe body.

Description

Method for judging crack extension of wear-resistant belt of drill pipe joint into pipe body Technical Field The invention belongs to the technical field of metal drilling tool wear-resisting belt inspection methods, and particularly relates to a method for judging whether a crack of a wear-resisting belt of a drill pipe joint extends into a pipe body. Background Drill pipe is a device commonly used in the petroleum and mining industries, and is a steel pipe with threads at the tail part, and is used for connecting surface equipment of a drilling machine and a device for drilling and grinding equipment or bottom holes at the bottom end of the drilling machine. In use, drill pipe joints are often severely worn due to frequent friction with the borehole wall. In order to reduce excessive abrasion of the drill rod joint in use and avoid drill rod breakage and accidents, a common practice is to build up a wear-resistant isolation belt (shown in figure 1) with a certain width and thickness in the circumferential direction of the drill rod joint pipe body 1, so that the outer wall of the drill rod joint is isolated from the casing wall or the well wall, the drill rod joint is prevented from being in direct contact with the casing wall or the well wall, the hardness of the wear-resistant belt 2 is high, and the drill rod joint and the casing can be protected from being worn strongly. When the drill rod wear-resistant belt is welded, welding cracks are sometimes generated on the outer surface due to the welding process. External surface weld cracks are allowable in some wear strip standards, but the weld cracks are not allowed to extend into the joint matrix (the pipe body after the joint is manufactured), because the weld cracks extending into the matrix easily cause severe reduction in the resistance to tension, compression and torsion of the joint, and easily cause failure accidents of the drill pipe. Therefore, whether the wear-resistant belt cracks extend into the matrix or not is detected and processed in time, and the drill rod safety device has important practical significance for safe use of the drill rod, prevention of drill rod failure accidents and prevention of drilling safety accidents. At present, surface cracks of the wear-resistant belt of the drill rod can be detected by adopting a few surface nondestructive detection methods, but no good judging method exists for whether the cracks extend into the joint matrix. Chinese patent CN117548667B discloses an alloy powder and a method for preparing wear-resistant belt of titanium alloy drill pipe joint by using the same. The invention combines the components of the first alloy powder and the second alloy powder by using a wide-spot laser cladding process and an ultra-high-speed laser cladding process to prepare the wear-resistant belt of the titanium alloy drill pipe joint with high hardness and high wear resistance, and solves the problems that the wear-resistant belt of the drill pipe joint used in the prior art is easy to crack, poor in wear resistance, limited in hardness and low in cladding efficiency. However, the invention does not relate to a method for detecting cracks of the abrasion-resistant belt of the drill rod and judging whether the drill rod extends into a pipe body or not. Chinese patent CN115365620A discloses a process method for overlaying a wear-resistant belt of a titanium alloy drill rod joint, which adopts TIGer double-tungsten-electrode hot wire argon arc welding process method, ensures that a nickel-based welding material and the titanium alloy drill rod joint are fused with each other through stable molten pool temperature control, ensures that the dilution rate of the welding material and a base material and the welding material deposition rate are higher and more stable, forms a wear-resistant belt with strong binding force, high hardness and good wear resistance on the titanium alloy drill rod joint, and can avoid failure caused by wear of the titanium alloy drill rod joint. However, the invention does not relate to a method for detecting cracks of the abrasion-resistant belt of the drill rod and judging whether the drill rod extends into a pipe body or not. Disclosure of Invention The invention aims to provide a judging method for extending cracks into a pipe body of a wear-resistant belt of a drill pipe joint, and solves the problem that the judging method for judging whether the cracks extend into the pipe body of the drill pipe joint is not special in the prior art. The invention adopts the technical scheme that the method for judging that the crack of the wear-resistant belt of the drill pipe joint extends into the pipe body comprises the following steps: Step1, manufacturing a special contrast sample for ultrasonic detection of a drill pipe joint wear-resistant belt comprising artificial grooving according to the material and specification of a drill pipe joint pipe body; step2, preprocessing the surface of the wear-re