阅读说明：本技术 采气树/采油树的阀门通径超声相控阵检测方法及系统 (Valve drift diameter ultrasonic phased array detection method and system for gas production tree/oil production tree ) 是由 张松 芦丹妍 王伟湘 杨国芳 于 2020-11-04 设计创作，主要内容包括：本发明属于超声波检测技术领域,具体提供了采气树/采油树的阀门通径超声相控阵检测方法,包括：根据采气树/采油树的法兰盘的缺陷特征制作相应的阀门通径模拟试块,阀门通径模拟试块上设置有与该缺陷特征一一对应的人工缺陷特征；人工缺陷特征包括缺陷孔C1、缺陷孔C2及缺陷孔C3,缺陷孔C1位于阀门通径与阀门本体连接处的外表面处,缺陷孔C2位于阀门通径的内径内壁处,缺陷孔C3位于阀门通径与阀门本体连接处的内表面处。该方案对阀门通径类的工件实现了100％检测覆盖,检测缺陷的重复性和覆盖性较好,缺陷检测数据较为准确,交界面处的检测精度可达到精度Ф2.0×1.0mm,且可用于现场检测,适于推广。(The invention belongs to the technical field of ultrasonic detection, and particularly provides a valve drift diameter ultrasonic phased array detection method of a gas production tree/oil production tree, which comprises the following steps: manufacturing a corresponding valve drift diameter simulation test block according to the defect characteristics of a flange plate of a gas production tree/oil production tree, wherein artificial defect characteristics which are in one-to-one correspondence with the defect characteristics are arranged on the valve drift diameter simulation test block; the artificial defect characteristics comprise a defect hole C1, a defect hole C2 and a defect hole C3, wherein the defect hole C1 is located on the outer surface of the joint of the valve drift diameter and the valve body, the defect hole C2 is located on the inner wall of the inner diameter of the valve drift diameter, and the defect hole C3 is located on the inner surface of the joint of the valve drift diameter and the valve body. The scheme realizes 100% detection coverage on the valve drift diameter type workpieces, has good repeatability and coverage for detecting defects, has accurate defect detection data, can ensure that the detection precision at the interface can reach the precision phi 2.0 multiplied by 1.0mm, can be used for field detection, and is suitable for popularization.)

1. The valve drift diameter ultrasonic phased array detection method of the gas production tree/oil production tree is characterized by comprising the following steps:

s1: manufacturing a corresponding valve drift diameter simulation test block according to the defect characteristics of a flange plate of a gas production tree/oil production tree, wherein artificial defect characteristics which are in one-to-one correspondence with the defect characteristics are arranged on the valve drift diameter simulation test block;

the artificial defect feature comprises defect hole C1, defect hole C2, and defect hole C3, the defect hole C1 being located at an outer surface where the valve stem and valve body are connected, the defect hole C2 being located at an inner diameter inner wall of the valve stem, the defect hole C3 being located at an inner surface where the valve stem and valve body are connected;

s2: scanning the surface of the valve drift diameter simulation test block by transmitting ultrasonic sound beams through an ultrasonic phased array to obtain a waveform characteristic diagram of artificial defect characteristics, and correspondingly storing the artificial defect characteristics and the waveform characteristic diagram to form a defect standard comparison table;

s3: and transmitting ultrasonic sound beams by an ultrasonic phased array to perform ultrasonic detection on the surface of the workpiece to obtain workpiece defect data, and comparing and analyzing the workpiece defect data and the defect standard comparison table to obtain actual defect characteristics of the workpiece.

2. The gas tree/Christmas tree valve drift diameter ultrasonic phased array detection method of claim 1, wherein: the artificial defect characteristics comprise one or more of white spots, forging cracks, stress corrosion cracks, manufacturing area type defects and volume type defects, inner wall corrosion, sealing surface corrosion or machining manufactured dark holes.

3. The gas tree/Christmas tree valve drift diameter ultrasonic phased array inspection method of claim 1, wherein the defect hole C1, the defect hole C2 and the defect hole C3 are all holes with a diameter of 2mm and a length of 2 mm.

4. The gas production tree/Christmas tree valve drift diameter ultrasonic phased array detection method of claim 1, wherein the S2 specifically comprises: when the ultrasonic phased array scans and covers the detection area for multiple times, the sound beams covered by the two times of scanning come from different directions and are mutually vertical; or the included angle of the ultrasonic sound beams from one direction and covered by any two times of scanning is not less than 10 degrees.

5. The method of claim 1, wherein the step S1 is preceded by the step of: and carrying out sound velocity adjustment, angle gain correction (ACG) adjustment and time gain correction (TCG) setting on the ultrasonic phased array.

6. The gas tree/Christmas tree valve drift diameter ultrasonic phased array detection method of claim 1, wherein the step S2 specifically comprises: the probe of the ultrasonic phased array is attached to the surface of the simulation test block, the ultrasonic sound beam passes through the artificial defect characteristics along the axial translation scanning of the simulation test block, a reflection echo area corresponding to the ultrasonic sound beam passing through the artificial defect characteristics is found on a scanned sector scanning image, the angle scanning line of the ultrasonic phased array is adjusted to find the maximum reflection amplitude, and the corresponding angle value on the ultrasonic phased array is the effective angle range.

7. The gas tree/Christmas tree valve gate diameter ultrasonic phased array inspection method of claim 1, wherein the inspection of the defective cell and the third defective hole is performed at a deflection angle of +15 ° to-15 °.

8. The ultrasonic phased array detection method for the drift diameter of the valve of the gas production tree/Christmas tree as claimed in claim 1, wherein when the ultrasonic sound beam scanning is performed at the connecting part of the drift diameter of the valve and the valve body, the scanning deflection angle is controlled so that the scanning angle of the outer surface of the drift diameter is the minimum effective angle and the scanning angle of the inner surface of the drift diameter is the maximum effective angle.

9. Gas production tree/production tree's valve latus rectum ultrasonic phased array detecting system, its characterized in that: comprises an ultrasonic phased array with a probe, a pulse reflectometer with a plurality of independent pulse transmitting/receiving channels, a scanning display module,

The ultrasonic phase array is used for generating ultrasonic sound beams to scan the surface of the flange plate simulation test block to obtain a waveform characteristic diagram of artificial defect characteristics, and correspondingly storing the artificial defect characteristics and the waveform characteristic diagram to form a defect standard comparison table; carrying out ultrasonic detection on the surface of the workpiece to obtain workpiece defect data;

wherein the artificial defect feature comprises defect hole C1, defect hole C2, and defect hole C3, the defect hole C1 being located at an outer surface where the valve stem is connected to the valve body, the defect hole C2 being located at an inner diameter wall of the valve stem, the defect hole C3 being located at an inner surface where the valve stem is connected to the valve body;

the data analysis module is used for comparing and analyzing the workpiece defect data with the defect standard comparison table to obtain the actual defect characteristics of the workpiece;

the scanning display module is used for displaying the actual defect characteristics of the workpiece.

Technical Field

The invention belongs to the technical field of ultrasonic detection, and particularly relates to a valve drift diameter ultrasonic phased array detection method and system for a gas production tree/oil production tree.

Background

The well head device and the gas production tree/oil production tree equipment are important equipment for oil and gas production, and comprise a casing head, a tubing head and an oil (gas) production tree, which are used for connecting casing strings and tubing strings, sealing annular spaces among the casings of all layers and between the casings and the tubing strings, controlling the pressure of a production well head and adjusting the flow of the oil and gas well head, and can also be used for special operations such as acidizing, fracturing, water injection, testing and the like. The Christmas tree consists of a valve, a reducing joint, a nozzle tip and pipeline fittings, and is a device for controlling oil and gas production and providing conditions for workover operations such as steel wires, cables, continuous oil pipes and the like. The method can be divided into the following structural forms: split type and integral type. Besides split type and integral type, the wing type air conditioner can also be divided into a single wing and a double wing.

When the gas production tree/Christmas tree is detected, the gas production tree/Christmas tree cannot be detached for detection and judgment, so that the detection is troublesome. At present, an ultrasonic detection device is mainly adopted to detect and judge the inner side defects of a gas production tree/a Christmas tree at the outer side, but the defect accuracy is difficult to guarantee.

Disclosure of Invention

The invention aims to provide a gas production tree/oil production tree valve drift diameter ultrasonic phased array detection method and system with high defect detection efficiency and low cost. To solve the above technical problems.

Therefore, the invention provides a valve drift diameter ultrasonic phased array detection method of a gas production tree/oil production tree, which comprises the following steps:

s1: manufacturing a corresponding valve drift diameter simulation test block according to the defect characteristics of a flange plate of a gas production tree/oil production tree, wherein artificial defect characteristics which are in one-to-one correspondence with the defect characteristics are arranged on the valve drift diameter simulation test block;

the artificial defect feature comprises defect hole C1, defect hole C2, and defect hole C3, the defect hole C1 being located at an outer surface where the valve stem and valve body are connected, the defect hole C2 being located at an inner diameter inner wall of the valve stem, the defect hole C3 being located at an inner surface where the valve stem and valve body are connected;

s2: scanning the surface of the valve drift diameter simulation test block by transmitting ultrasonic sound beams through an ultrasonic phased array to obtain a waveform characteristic diagram of artificial defect characteristics, and correspondingly storing the artificial defect characteristics and the waveform characteristic diagram to form a defect standard comparison table;

s3: and transmitting ultrasonic sound beams by an ultrasonic phased array to perform ultrasonic detection on the surface of the workpiece to obtain workpiece defect data, and comparing and analyzing the workpiece defect data and the defect standard comparison table to obtain actual defect characteristics of the workpiece.

Preferably, the artificial defect features include one or more of white spots, forge cracks, stress corrosion cracks, manufacturing area and volume defects, internal wall corrosion, seal face corrosion, or machining-manufactured dark holes.

Preferably, defect hole C1, defect hole C2 and defect hole C3 are all holes with a diameter of 2mm and a length of 2 mm.

Preferably, the S2 specifically includes: when the ultrasonic phased array scans and covers the detection area for multiple times, the sound beams covered by the two times of scanning come from different directions and are mutually vertical; or the included angle of the ultrasonic sound beams from one direction and covered by any two times of scanning is not less than 10 degrees.

Preferably, the S1 further includes before: and carrying out sound velocity adjustment, angle gain correction (ACG) adjustment and time gain correction (TCG) setting on the ultrasonic phased array.

Preferably, the step S2 specifically includes: the probe of the ultrasonic phased array is attached to the surface of the simulation test block, the ultrasonic sound beam passes through the artificial defect characteristics along the axial translation scanning of the simulation test block, a reflection echo area corresponding to the ultrasonic sound beam passing through the artificial defect characteristics is found on a scanned sector scanning image, the angle scanning line of the ultrasonic phased array is adjusted to find the maximum reflection amplitude, and the corresponding angle value on the ultrasonic phased array is the effective angle range.

Preferably, the detection of the defective groove and the third defective hole is performed at a deflection angle of +15 ° to-15 °.

Preferably, when the ultrasonic sound beam scanning is performed at the connecting portion of the valve drift diameter and the valve body, the scanning deflection angle is controlled so that the outer surface scanning angle of the drift diameter is the minimum effective angle, and the inner surface scanning angle of the drift diameter is the maximum effective angle.

The invention also provides a valve drift diameter ultrasonic phased array detection system of the gas production tree/oil production tree, which comprises an ultrasonic phased array with a probe, a pulse reflectometer containing a plurality of independent pulse transmitting/receiving channels, a scanning display module,

The ultrasonic phase array is used for generating ultrasonic sound beams to scan the surface of the flange plate simulation test block to obtain a waveform characteristic diagram of artificial defect characteristics, and correspondingly storing the artificial defect characteristics and the waveform characteristic diagram to form a defect standard comparison table; carrying out ultrasonic detection on the surface of the workpiece to obtain workpiece defect data;

wherein the artificial defect feature comprises defect hole C1, defect hole C2, and defect hole C3, the defect hole C1 being located at an outer surface where the valve stem is connected to the valve body, the defect hole C2 being located at an inner diameter wall of the valve stem, the defect hole C3 being located at an inner surface where the valve stem is connected to the valve body;

the data analysis module is used for comparing and analyzing the workpiece defect data with the defect standard comparison table to obtain the actual defect characteristics of the workpiece;

the scanning display module is used for displaying the actual defect characteristics of the workpiece.

The invention has the beneficial effects that: the invention provides a valve drift diameter ultrasonic phased array detection method of a gas production tree/oil production tree, which comprises the following steps: s1: manufacturing a corresponding valve drift diameter simulation test block according to the defect characteristics of a flange plate of a gas production tree/oil production tree, wherein artificial defect characteristics which are in one-to-one correspondence with the defect characteristics are arranged on the valve drift diameter simulation test block; the artificial defect characteristics comprise a defect hole C1, a defect hole C2 and a defect hole C3, wherein the defect hole C1 is positioned on the outer surface of the joint of the valve drift diameter and the valve body, the defect hole C2 is positioned on the inner wall of the inner diameter of the valve drift diameter, and the defect hole C3 is positioned on the inner surface of the joint of the valve drift diameter and the valve body; s2: scanning the surface of the valve drift diameter simulation test block by transmitting ultrasonic sound beams through an ultrasonic phased array to obtain a waveform characteristic diagram of artificial defect characteristics, and correspondingly storing the artificial defect characteristics and the waveform characteristic diagram to form a defect standard comparison table; s3: ultrasonic phased array is used for emitting ultrasonic sound beams to carry out ultrasonic detection on the surface of the workpiece to obtain workpiece defect data, and the workpiece defect data and a defect standard comparison table are compared and analyzed to obtain actual defect characteristics of the workpiece. Through the preparation simulation test block, detect the simulation test block, compare its defect with in the actual work piece detects to size and position of the defect that detects when the ultrasonic phase control actual detection of accurate acquisition. The scheme realizes 100% detection coverage on the valve drift diameter type workpieces, has good repeatability and coverage for detecting defects, has accurate defect detection data, can ensure that the detection precision at the interface can reach the precision phi 2.0 multiplied by 1.0mm, can be used for field detection, and is suitable for popularization.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic flow diagram of a gas tree/Christmas tree valve path ultrasonic phased array inspection method and system of the present invention;

FIG. 2 is a schematic diagram of a reference block for a gas tree/Christmas tree valve path ultrasonic phased array inspection method and system of the present invention;

FIG. 3 is a schematic diagram of the main components of a gas tree/Christmas tree apparatus of the present invention;

FIG. 4 is a process diagram of the body simulation test block detection site and deflection angle of the flange plate ultrasonic phased array detection method and system of the gas production tree/Christmas tree of the present invention;

FIG. 5 is a process diagram of the body simulation test block inspection surface scanning of the flange plate ultrasonic phased array inspection method and system of the gas production tree/Christmas tree of the present invention;

FIG. 6 is a diagram of a path simulation test block defect for the flange plate ultrasonic phased array detection method and system for a gas production tree/Christmas tree of the present invention;

FIG. 7 is a schematic diagram of a drift diameter simulation test block detection of the flange plate ultrasonic phased array detection method and system of the gas production tree/Christmas tree of the present invention;

FIG. 8 is a scanning process diagram of a drift diameter simulation test block detection surface of the flange plate ultrasonic phased array detection method and system of the gas production tree/Christmas tree of the present invention;

FIG. 9 is a process diagram of the valve cover detection location and deflection angle of the flange ultrasonic phased array detection method and system of the gas production tree/Christmas tree of the present invention;

fig. 10 is a process diagram of the valve cover detection surface scanning of the flange ultrasonic phased array detection method and system of the gas production tree/christmas tree of the present invention.

Description of reference numerals: the valve comprises a valve cover 1, a body 2, a flange 3, a drift diameter 4 and a probe 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, the invention provides a valve drift diameter ultrasonic phased array detection method for a gas production tree/oil production tree, which comprises the following steps:

s1: manufacturing a corresponding valve drift diameter simulation test block according to the defect characteristics of a flange plate of a gas production tree/oil production tree, wherein artificial defect characteristics which are in one-to-one correspondence with the defect characteristics are arranged on the valve drift diameter simulation test block;

the artificial defect characteristic comprises a defect hole C1, a defect hole C2 and a defect hole C3, the defect hole C1 is located at the outer surface of the joint of the valve drift diameter and the valve body, the defect hole C2 is located at the inner diameter inner wall of the valve drift diameter, and the defect hole C3 is located at the inner surface of the joint of the valve drift diameter and the valve body. Wherein, the sizes of defect hole C1, defect hole C2 and defect hole C3 are diameter 2mm, length 2mm, simulate defect type respectively and be: stress concentration cracks on the upper surface, corrosion defects on the inner surface, stress concentration cracks on the lower surface and erosion corrosion. The above-mentioned defects are all used to verify the accuracy of the detection and the diffusion compensation.

S2: and scanning the surface of the simulation test block by transmitting an ultrasonic sound beam through an ultrasonic phased array to obtain a waveform characteristic diagram of artificial defect characteristics, and correspondingly storing the artificial defect characteristics and the waveform characteristic diagram to form a defect standard comparison table. An ultrasonic beam is transmitted by an ultrasonic phased array, and the ultrasonic beam is reflected when passing through different media. When the ultrasonic beam of sector scanning detection is transmitted to the center or deflected and transmitted through the surface of the simulation test block, when the artificial defect hole is encountered, namely the artificial defect characteristic, the reflection occurs, and the detection atlas is obtained through detection after the reflection. As shown in the following table:

the height of the defect is 2.7mm, the aperture of the defect is 2.7mm, and the error of the two data is 0.7 after the detection atlas is analyzed, so that the requirement of detection precision is met. The simulation test block is said to be standard compliant. And subsequently, detecting the workpiece in the same way, and comparing and analyzing the workpiece with the data of the simulation test block to obtain corresponding actual defects in the workpiece.

S3: and transmitting ultrasonic sound beams by an ultrasonic phased array to perform ultrasonic detection on the surface of the workpiece to obtain workpiece defect data, and comparing and analyzing the workpiece defect data and the defect standard comparison table to obtain actual defect characteristics of the workpiece.

The ultrasonic detection technology comprises the steps of exciting independent piezoelectric wafers (array elements) of a phased array probe according to a set delay rule, combining sound beams, realizing the functions of moving, deflecting, focusing and the like of the sound beams, receiving ultrasonic signals according to a certain delay rule and displaying the internal state of an object to be detected in an image mode.

The related components of the oil (gas) production tree are: the oil pipe four-way joint, the three-way joint, the valve and rotary valve, the oil nozzle, the flange, the steel ring, the oil production tree cap, the back pressure valve and the like. The materials used are as follows:

watch 1

As shown in fig. 2 and table two, the table two is a reference block SL-PA-01 for the oil and gas production tree, and the ultrasonic phased array is calibrated and verified before detection. The same detection method is adopted for adjustment and verification, the detection object is a reference test block, and the reference test block is a standard piece and can be equivalent to a simulation test block. A reference test block is adopted for sound velocity adjustment and calibration of the longitudinal wave probe, an SL-PA-02 type No. 3 test block is recommended for sound velocity adjustment and calibration, and the depth of a flat-bottom hole is recommended to be 45mm and 90 mm. Sound velocity adjustment can also be carried out by adopting 2-order waves and 4-order waves of the CSK-IA test block plane. The sound velocity of the transverse wave probe is adjusted by using a standard test block, and the sound velocity is adjusted by using CSK-IA test blocks R50 and R100 circular arc surfaces.

Watch two

The SL-PA-01 test block is mainly used for ultrasonic sound velocity calibration during detection, longitudinal wave wedge ACG calibration and TCG sensitivity setting during detection, and the method is carried out according to instrument operation instructions. The SL-PA-02 test block is mainly used for setting a deflection angle of a body detection.

A reference test block is adopted for adjusting the ACG angle gain of the longitudinal wave probe, an SL-PA-02 type No. 3 test block is recommended, and the depth of a flat-bottom hole is 45 mm. The ACG angle gain debugging of the transverse wave probe recommends the adoption of a CSK-I AR100 circular arc surface for sound velocity adjustment. The ACG angle gain debugging of the longitudinal wave probe is carried out by adopting an SL-PA-02 type comparison test block, the type of the test block is selected according to the thickness of a workpiece detection part for setting TCG, and the selection of the test block refers to appendix A. The TCG is not debugged less than 4 points and its maximum should be set at the maximum sound path detected. During the fan scanning, due to wedge attenuation difference, difference between wafers, sound pressure reciprocating transmissivity difference and other factors, the echo amplitudes of sound beams at different angles to reflectors with the same size at the same sound path are different, and the difference is corrected by software to reach the same amplitude. And performing gain correction on the echoes of the reflectors with the same size at different sound paths to enable the echoes to reach the same amplitude.

The longitudinal wave sector scanning detection adopts a 0-degree wedge block, the thickness of the wedge block is calculated and passes a test block test, the influence of wedge block mirror surface wave beams on the judgment of detection defects is avoided, and the first-time mirror surface wave is about 1.5 times of the plate thickness in the primary wave detection. The calculation formula is as follows:

C1/H＝C2/1.5T

wherein: longitudinal wave velocity in C1 wedges

Longitudinal wave velocity in C2 workpieces

Thickness of T-piece

H thickness of wedge.

The wedge block angles adopted by the transverse wave sector scanning and the transverse wave line scanning include 45 degrees, 55 degrees, 60 degrees (natural angles) and the like, and when the corrosion defects of the flange surface are detected, a double-crystal probe is adopted for full-coverage detection. For curved workpieces it is ensured that the coupling is good, that the wedge is tailored to the curvature of the workpiece when the maximum clearance between the workpiece and the wedge exceeds 0.5mm, and that the parameters of the wedge in the instrument are changed to ensure the accuracy of the focusing rule. The detection sensitivity was set in the mode of TCG. TCG is set to not be less than 80% of full screen. The TCG setting is not less than 4 points, and its maximum purported setting should be set at the maximum thickness of the workpiece inspection site. The sensitivity setting should be done on the reference block. The focus distance is set at the maximum alleged for workpiece detection.

The phased array probe parameters can be selected according to table three, and the number of wafers in a single excitation is not less than 16.

TABLE III recommended Probe parameters

Maximum depth of detection/mm	Probe frequency/MHZ	Wafer spacing/mm	Deflection direction aperture size/mm
				6～50	15～5	1.0～0.3	5～25
50～100	10～4	1.5～0.5	20～35
				100～200	5～1	2.0～0.8	30～65

The simulation test block can be verified before detection. And detecting the simulated test block again by the calibrated ultrasonic phased array, and carrying out comparative analysis. Specifically, the process verification of the proposed detection process and method on the simulation test block is required for different parts before detection. The main evaluation of the process verification is to detect the effective sound beam range, the equivalent size of the standard defect aperture, the depth, the length and other dimensions of the artificial defect hole. When the workpiece with curvature is detected, the acoustic energy loss of diffusion attenuation and absorption attenuation can be compensated by analog adjustment. The simulation test block verification needs to record a simulation test block verification process, form a simulation test block verification record and issue a verification conclusion.

According to the preferable scheme, the simulation test block comprises a valve body simulation test block, a drift diameter simulation test block, a valve cover simulation test block, a large four-way simulation test block and a flange simulation test block according to different detection workpieces, and artificial defect characteristics are arranged in the simulation test block. The simulation test block is divided into the following parts according to different detection workpieces: the valve comprises a valve body simulation test block, a drift diameter simulation test block, a valve cover simulation test block, a large four-way simulation test block and a flange simulation test block. Artificial defect apertures with different depths at different positions are arranged in the simulation test block and are mainly used for verifying the detection sensitivity of the different positions and depths; the simulation test block is internally provided with area defects with different depth-width ratios, and mainly simulates the detection capability of the corrosion condition of the inner surface of the workpiece. The simulation test block is used for compensation debugging of diffusion attenuation caused by the internal curvature of the workpiece.

According to the preferred scheme, when the ultrasonic phased array scans and covers the detection area for multiple times, the sound beams covered by two times of scanning are from different directions and are mutually vertical; or the included angle of the ultrasonic sound beams from one direction and covered by any two times of scanning is not less than 10 degrees. The oil (gas) extraction tree phased array detection is divided into A-level and B-level according to the manufacturing and in-service working conditions, and different technical levels correspond to different detectable rates. The technical grade of the part of the oil (gas) tree workpiece is not lower than grade B when the part is detected in the manufacturing stage, and the technical grade of the part is not lower than grade A in the re-service stage. When the technical level is A level, the phased array detection area is ensured to realize complete coverage for 1 time or more. When the technical level is B level, the phased array detection area is ensured to realize full coverage of 2 times or more of scanning at different angles. The class A technology level measures the signal-to-noise ratio on a reference block, and the signal-to-noise ratio of phi 2 flat-bottom holes in the range of the acoustic path to be adopted by all acoustic beams is ensured to be more than 9 dB. The class B technique level, measuring the signal-to-noise ratio on a reference block, should ensure that the signal-to-noise ratio of the phi 2 flat-bottom hole in the range of the acoustic path to be used by all acoustic beams is greater than 12 dB.

As shown in fig. 3, the detection process is set according to different positions and detected defect types, and comprises a valve body 2, a drift diameter 4, a valve cover 1, a flange 3, a cylindrical hollow forging, a square hollow forging, bolts and the like. Then, corresponding simulation test blocks are manufactured for a plurality of common and representative part structures. The following description is made according to the detection methods of different simulation test blocks.

As shown in fig. 4 and 5, the body simulates a test block: the left side of the figure is a three-dimensional figure of a simulation test block, and the upper surface and the inner diameter hole of the simulation test block are respectively provided with a defect A and a defect B. On the right side of the figure are cross-sectional detail views of defect a and defect B. Wherein, the defect A is an internal defect at different positions, the depth of the hole is close to the hole diameter or half of the wall thickness, namely the depth is T/2, and T is the wall thickness. And the defect B is a defect groove on the inner surface of the aperture, namely a root corrosion type defect. During scanning, the probe 5 can move linearly along the outer surface.

As shown in fig. 6, the drift diameter simulation test block: at the junction of the drift diameter and the body, and the intersection of the drift diameter and the flange surface, the outer surface, namely the upper surface is provided with a defect hole C1, the hole is correspondingly used for simulating the stress concentration crack defect of the outer surface, and the defect is a self-manufacturing defect formed when the corresponding workpiece is machined and manufactured. The function is to verify the accuracy of the detection and the diffusion compensation. The inner surface of the junction, namely the lower surface, is provided with a defect hole C3, and the inner wall of the drift diameter is provided with a defect hole C2. Wherein, the defect hole C3 is used for simulating the stress concentration crack and the erosion corrosion of the lower surface. Defect hole C2 was used to simulate an internal surface corrosion defect to verify the accuracy of the inspection and diffusion compensation. Wherein defect wells C1, C3, and C2 correspond to well 1, well 2, and well 3, respectively, in TABLE IV.

Specifically, a longitudinal wave sector scanning mode is adopted for detection, as shown in fig. 7 and 8, after the probe 5 is arranged around the outer wall of the drift diameter, the longitudinal wave is adopted to perform annular moving scanning to find out corresponding artificial hole reflection echoes, a corresponding reflection echo area is found out on a sector scanning diagram, an instrument angle scanning line is adjusted to find out the maximum reflection amplitude, and at the moment, the corresponding angle value on the instrument is the effective angle range. When the drift diameter is detected specifically, the effective detection angle is determined according to the artificial reflection hole on the simulation test block. At the connecting position of the drift diameter and the valve body, the artificial hole on the upper surface (namely the outer surface of the drift diameter) controls the minimum effective angle, and the artificial hole on the lower surface (namely the inner surface of the drift diameter) controls the maximum effective angle. And when the corrosion defect inside the drift diameter is detected and the instrument is adjusted, the detection range is adjusted to 4 times of the plate thickness, and the detection area range is improved. Note that when defective cell C1 and defective cell C3 need to be detected, deflection scanning is required. All defective cells can be scanned using a minimum deflection angle of-15 and a maximum deflection angle of 30.

Specifically, when a main road part of a drift diameter is detected, longitudinal waves of-20 degrees to +40 degrees are adopted to scan secondary waves in a sector mode to completely cover the detection, 2T positions are selected for focusing depth, a corresponding comparison test block is adopted to calibrate the sound velocity of sector scanning before detection, TCG calibration is carried out on instrument equipment according to a phi 1.6 artificial flat bottom hole of the comparison test block, and a TCG detection curve is manufactured. In the detection process, the primary wave is mainly adopted to judge the defects at the drift diameter, and the corrosion defects of the end face of the flange sealing part at the position of 40mm in the horizontal direction of the secondary wave are mainly adopted. After calibration, detection is carried out to obtain a detection map.

As shown in fig. 9 and 10, the defects of the flange plate or the bonnet simulation block, which are stress concentration cracks or defects generated during manufacturing, are mainly concentrated in the vicinity of the bolt holes and the inner wall of the through hole, and the defects of the inner surface corrosion defects are mainly concentrated in the vicinity of the bolt holes and the inner wall of the through hole.

In addition, the detection of the flange seal face is similar to that of the drift diameter. For example, at the flange sealing surface, the defective hole at the sealing surface, i.e., the junction, can be detected by scanning through the deflection angle. The detection process of the flange plate is the same as that of the valve cover, and the description is omitted here. In a specific implementation scenario, 39 ° wedge transverse wave detection may be employed, with the angular range set at 45 ° to 72 °.

Among the above-mentioned each simulation test block, latus rectum simulation test block can simulate inside and the corruption class defect of forging valve gap and sealed face corruption class defect, flange face bolt hole department crack class defect. The valve cover simulation test block can simulate the defects of the interior and corrosion of the valve cover of the forged piece valve, the defects of the corrosion of the sealing surface and the defects of the cracks of the bolt hole of the flange surface. The body can simulate the detection of the interior of the large four-way joint of the casting and the defects of corrosion, and the detection process adopted at this time realizes the complete coverage of the detection surface.

The detection process adopted at this time realizes 100% detection coverage on the workpiece, the detection method has better repeatability and coverage for detecting the defects, the defect detection data is more accurate, and the detection precision at the interface can reach the precision phi 2.0 multiplied by 1.0 mm. The detection process can be used for field detection.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.