SY/T 5446-1992 Nondestructive testing methods for oil well pipes Ultrasonic testing of drill pipe welds SY/T5446-1992 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T5446--92
Non-destructive Testing Methods for Oil Well Pipe
Ultrasonic Testing of Drill Pipe Welds
Published on April 27, 1992
Ministry of Energy of the People's Republic of China
1 Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Non-destructive Testing Methods for Oil Well Pipe
Ultrasonic Testing of Drill Pipe Welds
This standard specifies the performance of ultrasonic testing equipment, testing methods and defect assessment of oil drill pipe welds. This standard is applicable to the inspection of transverse defects in the weld area of ​​oil drill pipes, such as cracks, lack of fusion, etc. 2 Reference standards
ZBY230A General technical conditions for pulse reflection ultrasonic flaw detector Z.BY231 Performance test method for ultrasonic flaw detection probe ZBY232 Technical conditions for standard test block No. 1 for ultrasonic flaw detection JB1152 Ultrasonic flaw detection of butt welds of boilers and steel pressure vessels 3 Flaw detectors
SY/T5446-92
31 Personnel who conduct flaw detection of drill pipe welds shall obtain a qualification certificate for ultrasonic flaw detection issued by an industry technical supervision department with the qualification to issue certificates, and have experience in weld flaw detection. 3.2 Flaw detectors shall understand the material and welding process of the drill pipe to be inspected, the possible defects and the parts that may produce defects. 3.3 Flaw detectors shall have the ability to comprehensively determine defects in conjunction with other flaw detection methods such as fluorescent magnetic powder. 3.4 Flaw detectors shall be familiar with the contents of this standard. 4.1 Flaw detector
4.1.1 A type pulse reflection ultrasonic flaw detector is used, and its working range should include at least 2~5MIIz and be adjustable. 4.1.2 The horizontal linearity, vertical linearity, dynamic range, accuracy and range of the attenuator and other electrical properties of the instrument should comply with the relevant provisions of ZBY230.
4.2 Probe
4.2.1 A single-piece oblique probe with a hard protective block is used. 4.2.2 The frequency of the probe is 2.5MHz or 5MHz, and the frequency error does not exceed ±10%. 4.2.3 The K value of the probe can be selected between 1 and 2.5 according to the size of the thickened part of the drill pipe, so as to inspect the entire weld. 4.2.4 The main sound beam emitted by the probe should have no double peaks and no deflection. 4.2.5 The performance of the probe should be tested regularly according to the method specified in 7.HY231. 4.2.6 To ensure stable coupling between the probe and the workpiece, the contact surface of the probe can be processed into an arc surface that adapts to the outer surface of the thickened end of the drill pipe to be detected. 4.2.7 The probe K value, incident point or front distance should be calibrated before flaw detection. 4.2.8 The combined sensitivity of the instrument and the probe, when the echo height at the maximum treatment distance of the 1.61m through hole on the corresponding comparison test block reaches more than 5% (or 80%) of the full amplitude, the effective sensitivity margin should be greater than 20B, and the signal-to-noise ratio will not affect normal judgment. 4.3 Coupling agent
Approved by the Ministry of Energy of the People's Republic of China on April 27, 1992 and implemented on October 1, 1992www.bzxz.net
SY/T5446-92
Usually, liquids with good sound permeability, non-toxic, non-corrosive and economical and easily available such as engine oil and fluorine are selected as coupling agents. .5 Comparison test block
5.1 The thickness, radius of curvature and steel grade of the comparison test block used to adjust the sensitivity of the flaw detection should be the same as the thickened part of the drill cup tube body to be inspected. The artificial defect reflector is a 1.6mm radial through hole. The distance from the through hole to the edge of the test block is shown in Figure 1. It should be suitable for the movement of the probe and will not generate boundary interference signals.
R/2-outer diameter of the thickened end of the drill pipe: R/-inner diameter of the thickened end of the drill pipe
5.2 For the comparison test block used to adjust the scanning range and delayed scanning, the test block specified in ZBY232 can be selected. For on-site use, the test block shown in Figure 2 can also be selected. Its material should be similar to the drill pipe to be inspected. All
1 1.5 2.0 2. 8
R-Diameter of thickened end
6 Flaw detection method
6.1 Workpiece preparation
The surface of the flaw detection part should be flat and smooth, and there should be no oil, rust and other dirt that affect the sound. The raised parts such as cone marks should be repaired and ground off.
6.1.1
6.1.2 There should be no bosses, slag, deep cutting gate lines or grinding marks on the inner and outer surfaces of the weld. 2
6.2 Flaw sensitivity calibration
SY/T5446-92
6.2.F Adjust the scanning speed and scanning line of the instrument on the test block. The adjustment method of the scanning line refers to Appendix 3 in JB1152. 6.2.2 The artificial defect reflector is a through hole with a diameter of @1.6mm. 6.2.3 The probe is placed at a span distance from the hole on the comparison test block shown in Figure 1, so that the maximum echo height at the top of the hole is 50% (or 80%) of the full scale, the sensitivity margin is not less than 20dB, and the signal-to-noise ratio shall not affect normal judgment. 6.2.4 Measure the material attenuation of different ranges on the comparison test block. 6.2.5 Measure the surface acoustic energy loss difference between the test block and the workpiece. The method is referred to Appendix 4 of JB1152. 6.2.6 On the basis of the initial sensitivity adjusted in Article 6.2.3, the sensitivity after correction and compensation for the material attenuation and surface acoustic energy loss difference is the flaw detection sensitivity.
6.3 Scanning method
6.3.1 In principle, the secondary wave method is used to scan the weld from the thickened part of the pipe body, but according to the K value of the probe, the distance from the front edge of the probe and the length of the thickened part of the pipe body, the primary wave scanning of the weld is not excluded. 6.3.2 The probe is placed directly opposite the weld, and moves in a zigzag pattern along the circumference of the body when moving forward and backward. 6.3.3 When the probe is moved along the circumference, the coverage rate shall not be less than 15% of the probe piece size. 6.3.4 During the movement of the probe, good contact shall be ensured, and the moving speed shall generally not exceed 100 mИ/s. 6.4 Recalibration of sensitivity
6.4.1 Before each operation, the sensitivity of the instrument must be calibrated according to the requirements of 6.2. 6.4.2 The sensitivity of the instrument must be recalibrated in any of the following circumstances: a. The position of the sensitivity adjustment knob on the instrument has changed; b. The probe or probe line has been replaced; c. The coupling agent has been changed; d. The source has been replaced; e. The instrument or probe has been repaired; f. It has worked continuously for more than 2 hours; 3. The ability to judge defects; h. When the operator deems it necessary: ​​
The operation is over.
6.4.3 Recalibrate the sensitivity. If the sensitivity decreases by more than 2dB (including 2dB), the remaining drill pipes checked after the L-th sensitivity calibration should be rechecked: If the sensitivity is found to have increased by 2dB (including 2dB), the drill pipes that have been inspected since the L-th sensitivity calibration should be rechecked.
7 Defect evaluation and marking
7.1 When the echo height is greater than or equal to the echo height of the corresponding part of the artificial defect reflector on the comparison test block, it should be identified as a defect. The determination of defects shall be based on the detection sensitivity determined in Article 6.2.6. 7.2 When the echo height is lower than the echo height of the corresponding part on the comparison test block and the low circumferential indication length exceeds 20mm, it should still be judged as a defect. 7.3 It is allowed to use other flaw detection methods to comprehensively judge the nature of the defect, as long as the flaw detection personnel can determine it as a hazardous defect, it is not subject to the restrictions of Articles 7.1 and 7.2.
7.4 Mark the drill pipes that pass the flaw detection and those that fail (have defects) respectively, and mark the locations of the defects. 8 Flaw detection report
The flaw detection report should at least include the following contents: a. Drilling scale bridge:
b. Flaw detector model, probe frequency, K value and chip size, flaw detection sensitivity, comparison test block, coupling agent; 3
Flaw detection results and qualitative and quantitative summary of defects, d. Name and certificate number of the flaw detector,
e. T. Working time and place.
Additional remarks:
SY/T 5446—92
This standard was proposed by the Petroleum Pipe Standardization Committee. This standard was drafted by the Drilling Engineering Service Company of the Central Plains Petroleum Exploration Bureau. The main drafter of this standard is Ruijun.
This standard remains valid after the review in 199, and the review result has been approved by the State Bureau of Petroleum and Chemical Industry.
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