Test block for simulating hole blocking surfacing layer of underwater Christmas tree and detection method of test block

Abstract

The invention discloses a test block for simulating a blocked hole surfacing layer of an underwater Christmas tree and a detection method thereof.The test block for simulating the blocked hole surfacing layer of the underwater Christmas tree comprises a first to-be-detected structure and a second to-be-detected structure, the second to-be-detected structure is connected to the first to-be-detected structure, and the first to-be-detected structure and the second to-be-detected structure are connected in a welded mode; a plurality of reflector simulation areas are formed between the first to-be-detected structure and the second to-be-detected structure, and the reflector simulation areas are detected through ultrasonic waves. The simulation reflector of the test block for simulating the hole blocking surfacing layer of the underwater Christmas tree can be customized and manufactured according to the material and size of the underwater Christmas tree part and the groove type of the surfacing position, ultrasonic detection of hole blocking surfacing of the underwater Christmas tree part is achieved, and the defect that the surfacing area exceeds the standard is found. The surfacing welding seam is detected through the simulation reflector, the full surfacing welding seam and a heat affected zone can be detected, the defect detection rate is increased, the engineering project quality is guaranteed, and the simulation reflector can be widely popularized and used in projects.

Description

Technical Field

[0001] The invention belongs to the technical field of marine petroleum engineering, and in particular relates to a test block simulating an underwater Christmas tree plugging surfacing layer and a detection method thereof. Background Art

[0002] The material of the underwater oil production tree is duplex stainless steel. Due to construction errors, there have been cases where the components of the underwater oil production tree have been drilled with the wrong holes. Since the components with the wrong holes can no longer be connected and used, they need to be replaced.

[0003] Replacing parts due to misaligned holes will cause higher usage costs for the company. At the same time, if the misaligned holes of underwater oil production tree parts are sealed with surfacing welding and ultrasonic testing is performed, if the surfacing welding does not meet the construction requirements, the parts still need to be replaced.

[0004] Therefore, it is urgent to design a test block that simulates the underwater oil tree plugging weld layer to solve the above-mentioned problems. Summary of the Invention

[0005] In order to solve the technical problem mentioned in the background technology that underwater oil tree components need to be surfacing welded at the position of the misaligned holes, a test block simulating the underwater oil tree hole plugging surfacing layer is provided to solve the problem of solving the problem of testing the surfacing quality at the hole.

[0006] To achieve the above-mentioned purpose, the specific technical solution of the test block simulating the underwater Christmas tree plugging cladding layer of the present invention is as follows: A test block simulating a plugging weld overlay layer of an underwater oil tree includes a first structure to be tested and a second structure to be tested. The second structure to be tested is connected to the first structure to be tested. The first structure to be tested and the second structure to be tested are welded together to form a plurality of reflector simulation areas between the first structure to be tested and the second structure to be tested. The reflector simulation areas are tested using ultrasonic waves.

[0007] Furthermore, an internal thread structure is provided in the opening of the first structure to be inspected, and an external thread structure is provided in the second structure to be inspected. The second structure to be inspected is connected to the internal thread structure of the first structure to be inspected through the external thread structure, so that a first reflector simulation area and a second reflector simulation area are formed between the first structure to be inspected and the second structure to be inspected.

[0008] Furthermore, a groove is provided at the opening of the first structure to be inspected, and the end of the second structure to be inspected and the groove of the first structure to be inspected form a third reflector simulation area and a fourth reflector simulation area.

[0009] Furthermore, the first structure to be inspected is cylindrical, and the second structure to be inspected is a cylinder.

[0010] A method for detecting a test block simulating an underwater Christmas tree plugging cladding layer mainly comprises the following steps: S1. Threading the first structure to be inspected and the second structure to be inspected; S2, performing surfacing welding on the connection between the first structure to be inspected and the second structure to be inspected to form a first reflector simulation area and a second reflector simulation area; S3, performing surfacing welding on the groove of the first structure to be inspected, so as to form a third reflector simulation area and a fourth reflector simulation area between the second structure to be inspected and the first structure to be inspected; S4, machining and polishing the surfaces of the first structure to be inspected and the second structure to be inspected after welding; S5. Detect surfacing welding defects in the first reflector simulation area, the second reflector simulation area, the third reflector simulation area, and the fourth reflector simulation area by using ultrasonic equipment.

[0011] Furthermore, the ultrasonic device detects the first reflector simulation area, and uses the group of reflectors to draw a dual crystal straight probe DAC curve to detect point defects between the first structure to be inspected and the second structure to be inspected.

[0012] Furthermore, the ultrasonic device detects the second reflector simulation area, and uses the group of reflectors to draw a dual-crystal straight / oblique probe DAC curve to detect strip defects between the first structure to be inspected and the second structure to be inspected.

[0013] Furthermore, the ultrasonic equipment detects the third reflector simulation area, and uses the group of reflectors to draw a dual-crystal oblique probe DAC curve to detect point defects on the groove surface of the first structure to be inspected.

[0014] Furthermore, the ultrasonic equipment detects the fourth reflector simulation area, and uses the group of reflectors to draw a DAC curve of the dual-crystal oblique probe to detect noodle-shaped defects on the groove of the first structure to be inspected.

[0015] The test block of the present invention simulating the underwater Christmas tree plugging weld overlay layer has the following advantages: This simulated reflector can be customized based on the material, size, and weld groove type of underwater tree components, enabling ultrasonic testing of welds plugging holes in underwater tree components and identifying defects exceeding the specified standards in the weld area. This application utilizes this simulated reflector to inspect weld seams, including the entire weld seam and heat-affected zone, improving defect detection rates and ensuring project quality. This technology is suitable for widespread adoption in projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the method of the present invention; Figure 2 This is a schematic diagram of the connection between the first structure to be inspected and the second structure to be inspected according to the present invention; Figure 3Schematic diagram of the position of the first reflector simulation area of ​​the present invention; Figure 4 Schematic diagram of the position of the second reflector simulation area of ​​the present invention; Figure 5 Schematic diagram of the position of the third reflector simulation area of ​​the present invention; Figure 6 Schematic diagram of the position of the fourth reflector simulation area of ​​the present invention.

[0017] Description of the marks in the figure: 1. First structure to be inspected; 2. Second structure to be inspected; 3. Groove; 4. First reflector simulation area; 5. Second reflector simulation area; 6. Third reflector simulation area; 7. Fourth reflector simulation area. DETAILED DESCRIPTION

[0018] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] Those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is intended to be within the scope of the present invention and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0020] Please refer to the attached Figure 1 To the attached Figure 6 The present invention describes a test block for simulating a subsea Christmas tree plugging weld overlay.

[0021] like Figure 2 As shown, the test block simulating the underwater oil tree plugging weld overlay layer in the present invention includes a first structure to be inspected 1 and a second structure to be inspected 2. The second structure to be inspected 2 is connected to the first structure to be inspected 1, and the first structure to be inspected 1 and the second structure to be inspected 2 are welded together to form a plurality of reflector simulation areas between the first structure to be inspected 1 and the second structure to be inspected 2, and the reflector simulation areas are inspected by ultrasonic waves.

[0022] This simulated reflector can be customized based on the material, size, and weld groove type of underwater tree components, enabling ultrasonic testing of welds plugging holes in underwater tree components and identifying defects exceeding the specified standards in the weld area. This application utilizes this simulated reflector to inspect weld seams, including the entire weld seam and heat-affected zone, improving defect detection rates and ensuring project quality. This technology is suitable for widespread adoption in projects.

[0023] Further, if Figures 2 to 6 As shown, an internal thread structure is provided in the opening of the first structure to be inspected 1, and an external thread structure is provided in the second structure to be inspected 2. The second structure to be inspected 2 is connected to the internal thread structure of the first structure to be inspected 1 through the external thread structure, so that a first reflector simulation area 4 and a second reflector simulation area 5 are formed between the first structure to be inspected 1 and the second structure to be inspected 2.

[0024] A groove 3 is provided at the opening of the first structure to be inspected 1, and the end of the second structure to be inspected 2 and the groove 3 of the first structure to be inspected 1 form a third reflector simulation area 6 and a fourth reflector simulation area 7; the first structure to be inspected 1 is cylindrical, and the second structure to be inspected 2 is a cylinder.

[0025] In this embodiment, preferably, the first structure to be inspected 1 is cylindrical, and an internal thread is provided on the inner wall of the first structure to be inspected 1; the second structure to be inspected 2 is cylindrical, and an external thread is provided on the outer surface of the second structure to be inspected 2, and the second structure to be inspected 2 is screwed to the first structure to be inspected 1 by screwing the internal thread and the external thread, so as to simulate the internal plugging process and ensure the connection strength.

[0026] After the first structure to be inspected 1 and the second structure to be inspected 2 are connected, the first structure to be inspected 1 and the second structure to be inspected 2 are connected by welding at the screw connection (A) using an on-site cladding welding process, and cladding is performed on the external port. After the cladding is completed, the port surface is machined to ensure that the cladding level at the end groove of the first structure to be inspected 1 meets the construction requirements.

[0027] The simulated test block formed by welding the first structure to be inspected 1 and the second structure to be inspected 2 is divided into a first reflector simulation area 4 and a second reflector simulation area 5 at the threaded connection, and a third reflector simulation area 6 and a fourth reflector simulation area 7 at the groove 3 of the first structure to be inspected 1. The first reflector simulation area 4, the second reflector simulation area 5, the third reflector simulation area 6 and the fourth reflector simulation area 7 are inspected by ultrasonic equipment.

[0028] The present application also provides a method for detecting a test block of a simulated underwater Christmas tree plugging surfacing layer, comprising the following steps; S1, threading the first structure to be inspected 1 and the second structure to be inspected 2; S2, performing surfacing welding on the connection between the first structure to be inspected 1 and the second structure to be inspected 2 to form a first reflector simulation area 4 and a second reflector simulation area 5; S3, performing build-up welding on the groove 3 of the first structure to be inspected 1, so as to form a third reflector simulation area 6 and a fourth reflector simulation area 7 between the second structure to be inspected 2 and the first structure to be inspected 1; S4, machining and polishing the surfaces of the first structure to be inspected 1 and the second structure to be inspected 2 after welding; S5. Detect surfacing welding defects in the first reflector simulation area 4, the second reflector simulation area 5, the third reflector simulation area 6 and the fourth reflector simulation area 7 by ultrasonic equipment.

[0029] Further, if Figure 1 As shown, the ultrasonic equipment detects the first reflector simulation area 4, and uses this group of reflectors to draw the DAC curve of the dual crystal straight probe to detect point defects between the first structure to be inspected 1 and the second structure to be inspected 5; the ultrasonic equipment detects the second reflector simulation area 5, and uses this group of reflectors to draw the DAC curve of the dual crystal straight / oblique probe to detect strip defects between the first structure to be inspected 1 and the second structure to be inspected 2.

[0030] The ultrasonic equipment detects the third reflector simulation area 6, and uses this group of reflectors to draw the DAC curve of the dual-crystal oblique probe to detect point defects on the groove 3 of the first structure to be inspected 1; the ultrasonic equipment detects the fourth reflector simulation area 7, and uses this group of reflectors to draw the DAC curve of the dual-crystal oblique probe to detect noodle defects on the groove 3 of the first structure to be inspected 1.

[0031] In this embodiment, the ultrasonic wave emitted by the dual-crystal straight / oblique probe encounters the reflected echoes generated by the reflectors at different depths in the test block. The line connecting the peak points at the corresponding positions on the ultrasonic detector screen is the DAC curve (distance-amplitude curve). The specific process is as follows: First, when the ultrasonic detector is turned on, connect the probe and probe cable to the ultrasonic detector, and adjust the working mode of the ultrasonic detector to the dual-crystal state. Then use the test block to calibrate the probe zero bias probe and incident line (this item is only applicable to dual-crystal oblique probes), and then turn on the DAC curve drawing function of the ultrasonic detector. Then place the probe on a simulated reflector of the same type in one of the 4 partitions of the test block and closest to the surface of the test block, and then move the probe back and forth (dual-crystal straight / oblique probe) and left and right. Stop when the ultrasonic flaw detector screen displays the highest value. Adjust the gain key of the ultrasonic detector to adjust the wave height displayed on the screen to 80% of the full screen. Press the record key of the ultrasonic detector. At this time, the first point of the DAC curve has been adjusted. According to this method, draw points of similar reflectors deeper from the surface in turn until the last depth of the reflector is recorded (at least 3 points are drawn). Press the confirm key of the ultrasonic detector. At this time, the DAC curve is drawn.

[0032] Since the ultrasonic detector is testing cladding, its detection area is basically within the near field of the probe, and the sound pressure distribution in the near field is uneven. It can only draw DAC curves for simulated reflectors of different depths. This can provide a reference for the quantification of defects found and make the quantification more accurate, and accurately rate the weld quality. It can also indirectly compare and evaluate the size of the defect, that is, compare it with the size of the simulated reflector for drawing the DAC curve. If it is higher than the DAC curve, it means that the defect size is larger than the simulated reflector. If it is lower than the DAC curve, it means that the defect size is smaller than the simulated reflector.

[0033] For the test block based on the simulated underwater Christmas tree plugging weld layer, DAC curves are drawn according to the four different reflectors marked on the simulated reflector, and the plugging weld area is tested separately. This can improve the ultrasonic quantitative and positioning accuracy of the weld area, improve the ultrasonic detection sensitivity and work efficiency, ensure product quality, save costs for the enterprise, and ensure the construction period.

[0034] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A test block simulating an underwater Christmas tree plugging weld cladding layer, characterized in that: The device comprises a first structure to be inspected and a second structure to be inspected, wherein the second structure to be inspected is connected to the first structure to be inspected, and the first structure to be inspected and the second structure to be inspected are welded together to form a plurality of reflector simulation areas between the first structure to be inspected and the second structure to be inspected, and the reflector simulation areas are inspected by ultrasonic waves.

2. The test block for simulating the underwater Christmas tree plugging weld layer according to claim 1, characterized in that: An internal thread structure is provided in the opening of the first structure to be inspected, and an external thread structure is provided in the second structure to be inspected. The second structure to be inspected is connected to the internal thread structure of the first structure to be inspected through the external thread structure, so that a first reflector simulation area and a second reflector simulation area are formed between the first structure to be inspected and the second structure to be inspected.

3. The test block for simulating the underwater Christmas tree plugging weld layer according to claim 1, characterized in that: A groove is provided at the opening of the first structure to be inspected, and the end of the second structure to be inspected and the groove of the first structure to be inspected form a third reflector simulation area and a fourth reflector simulation area.

4. The test block for simulating the underwater Christmas tree plugging weld overlay according to claim 1, characterized in that: The first structure to be inspected is cylindrical, and the second structure to be inspected is a cylinder.

5. A method for detecting a test block simulating a plugging weld layer of an underwater Christmas tree, characterized in that: The main steps include: S1. Threading the first structure to be inspected and the second structure to be inspected; S2, performing surfacing welding on the connection between the first structure to be inspected and the second structure to be inspected to form a first reflector simulation area and a second reflector simulation area; S3, performing surfacing welding on the groove of the first structure to be inspected, so as to form a third reflector simulation area and a fourth reflector simulation area between the second structure to be inspected and the first structure to be inspected; S4, machining and polishing the surfaces of the first structure to be inspected and the second structure to be inspected after welding; S5. Detect surfacing welding defects in the first reflector simulation area, the second reflector simulation area, the third reflector simulation area, and the fourth reflector simulation area by using ultrasonic equipment.

6. The method for detecting a test block of a simulated underwater Christmas tree plugging weld cladding layer according to claim 5, characterized in that: The ultrasonic device detects the first reflector simulation area, and uses the group of reflectors to draw a dual-crystal straight probe DAC curve to detect point defects between the first structure to be inspected and the second structure to be inspected.

7. The method for detecting a test block of a simulated underwater Christmas tree plugging weld cladding layer according to claim 5, characterized in that: The ultrasonic equipment detects the second reflector simulation area, and uses the group of reflectors to draw a dual-crystal straight / oblique probe DAC curve to detect strip defects between the first structure to be inspected and the second structure to be inspected.

8. The method for detecting a test block of a simulated underwater Christmas tree plugging weld cladding layer according to claim 5, characterized in that: The ultrasonic equipment detects the third reflector simulation area, and uses this group of reflectors to draw a dual-crystal oblique probe DAC curve to detect point defects on the groove surface of the first structure to be inspected.

9. The method for detecting a test block of a simulated underwater Christmas tree plugging weld cladding layer according to claim 5, characterized in that: The ultrasonic equipment detects the fourth reflector simulation area, and uses this group of reflectors to draw a DAC curve of the dual-crystal oblique probe to detect noodle-shaped defects on the groove of the first structure to be inspected.

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