Device for testing sealing performance of oil casing sample

Abstract

The invention provides an oil casing sample sealing performance testing device, which comprises: an experiment bench having a base capable of placing a to-be-tested sample, the to-be-tested sample having a first sample piece and a second sample piece sleeving the first sample piece, the first sample piece being in contact with the second sample piece to form a sealing surface; and the detection mechanism is located above the experiment bench, the detection mechanism is provided with at least one phased array ultrasonic probe capable of rotating around the peripheral surface of the second sample piece, and the at least one phased array ultrasonic probe is arranged towards the sealing surface. The device for testing the sealing performance of the oil casing sample provides equipment support for an experiment of phase-controlled ultrasonic detection of the sealing performance of the oil casing, and then ultrasonic characteristic signals and ultrasonic contact cloud atlas standards of the oil casings with different buckle types and specifications can be established according to the testing result of the testing device.

Description

Technical Field

[0001] The invention relates to the technical field of oil casing sealing detection, in particular to an oil casing sample sealing test device. Background Art

[0002] At present, the oil industry has fully utilized carbon dioxide by injecting it into oil and gas wells to improve oil and gas recovery rates while geologically sealing carbon dioxide. Carbon dioxide injection wells mostly use special threaded oil casing with excellent sealing performance and high price to ensure the safe and effective operation of carbon dioxide injection wells. Once the special threaded oil casing joint does not meet the airtightness requirements and is lowered into the well, it is very easy to leak due to the injection of low-temperature liquid carbon dioxide, and the axial and complex dynamic load conditions of the pipe column. Special threaded oil casing joints usually adopt metal-to-metal contact sealing, and achieve sealing through a flat and intact sealing surface and sufficient contact pressure.

[0003] The threaded connection of oil casing is the part where gas seal failure is most likely to occur. It is extremely important to test the gas seal of the threaded connection before the oil casing is lowered into the well. At present, the main methods for gas seal detection of oil casing include torque-turn diagram method, helium seal detection method, and phased array ultrasonic reflection amplitude stress detection method.

[0004] Among them, the torque-turn diagram method ensures the effective connection of the oil casing by monitoring the number of turns and torque during the buckling process, but this method can easily cause over-torque of the oil casing, seriously affecting the service life. The helium sealing detection method is to insert a packer inside the oil pipe and perform a pressure test method for detection, but the operation is complicated, the equipment is large, the cost is high, and failure analysis cannot be performed. The phased array ultrasonic reflection amplitude stress method determines the contact state of the sealing surface by ultrasonically collecting the reflected echo of the sealing surface contact interface. It has the advantages of high detection efficiency, easy operation, and portable equipment, and has good development prospects. However, this method is affected by the buckle type and specifications of the oil casing, and it is necessary to establish ultrasonic characteristic signals and ultrasonic contact cloud map standards for different buckle types and specifications. At present, there is no research on the characteristic signals and characteristic cloud map standards in the phased array ultrasonic detection of special threaded oil casing air tightness detection. Summary of the invention

[0005] The purpose of the present invention is to provide a test device for the sealing of oil casing samples, which provides equipment support for experiments on phased ultrasonic testing of the gas sealing of oil casing, and further, through the test results of the test device, the ultrasonic characteristic signals and ultrasonic contact cloud map standards of oil casing with different buckle types and specifications can be established.

[0006] The object of the present invention is to provide a device for testing the sealing performance of an oil casing sample, which comprises:

[0007] A test bench, having a base capable of placing a sample to be tested, wherein the sample to be tested comprises a first sample piece and a second sample piece sleeved on the first sample piece, and the first sample piece can contact the second sample piece to form a sealing surface;

[0008] The detection mechanism is located above the experimental bench, and the detection mechanism has at least one phased array ultrasonic probe that can rotate around the outer circumference of the second sample piece, and at least one phased array ultrasonic probe is arranged toward the sealing surface.

[0009] In a preferred embodiment of the present invention, a propulsion mechanism is connected to the base, the first sample piece is connected to the base, the second sample piece is clamped on the experimental bench, and the first sample piece can be in close axial contact with the second sample piece under the action of the propulsion mechanism.

[0010] In a preferred embodiment of the present invention, the experimental bench also has a first flange and a second flange connected by bolts, the first flange is connected to the base, the propulsion mechanism is installed on the first flange, and the second specimen is clamped to the second flange.

[0011] In a preferred embodiment of the present invention, a pressure sensor is connected to the propulsion mechanism, and a sonic sensor is connected to the second flange.

[0012] In a preferred embodiment of the present invention, the detection mechanism has at least one sliding rod, at least one end of the sliding rod is connected to the phased array ultrasonic probe, and the sliding rod is rotatably connected to the top end of the second sample piece.

[0013] In a preferred embodiment of the present invention, a pin is provided at the top end of the second sample piece, the axis of the slide bar is perpendicular to the axis of the pin, and the pin is rotatably connected to the slide bar via a turntable.

[0014] In a preferred embodiment of the present invention, the two ends of the sliding rod are respectively connected to a first probe frame and a second probe frame, the first probe frame and the second probe frame are located on the outer peripheral side of the second sample piece, and there are two phased array ultrasonic probes, and one of the phased array ultrasonic probes is respectively connected to the first probe frame and the second probe frame.

[0015] In a preferred embodiment of the present invention, an injection head capable of placing coupling agent is connected to the first probe holder or the second probe holder, and the injection head is arranged toward the gap between the second sample piece and the phased array ultrasonic probe.

[0016] In a preferred embodiment of the present invention, a tension spring is connected between the first probe frame and the second probe frame.

[0017] In a preferred embodiment of the present invention, the inner wall of the first sample piece has an inner conical surface, the top of the outer wall of the second sample piece has an outer conical surface, the inner conical surface contacts the outer conical surface to form the sealing surface, and the side wall of the second sample piece is provided with an air vent that can be connected to an air source.

[0018] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0019] 1. The oil casing sample sealing test device of the present invention has an air source, an acoustic wave sensor, a propulsion mechanism and a pressure sensor. By changing the contact surface angle, contact length and surface treatment method of the sample to be tested, the sealing surface contact of oil casing with different specifications and different thread types can be simulated. Through the phased array ultrasonic probe on the detection mechanism, the phased array ultrasonic oil casing gas sealing detection process under different working conditions is simulated.

[0020] 2. The oil casing sample sealing test device described in the present invention can be used for experimental research on the principle of metal contact sealing detected by phased array ultrasonic detection, and can provide device support for further establishing the phased array ultrasonic detection standard for threaded oil casing gas sealing detection based on the phased array ultrasonic signal characteristics of metal contact sealing of specific buckle types, and can be widely used in the field of oil casing gas sealing detection in carbon dioxide injection wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0023] Figure 1 It is a structural schematic diagram of the oil casing sample sealing test device of the present invention;

[0024] Figure 2It is a front view structural schematic diagram of the oil casing sample sealing test device of the present invention;

[0025] Figure 3 It is a schematic diagram of the top view of the structure of the oil casing sample sealing test device of the present invention;

[0026] Figure 4 It is a schematic cross-sectional structure diagram of the oil casing sample sealing test device of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the detection mechanism described in the present invention.

[0028] Description of Figure Numbers:

[0029] 10. Experimental bench; 11. Base; 12. Propulsion mechanism; 13. First flange; 14. Second flange; 15. Connecting bolts;

[0030] 20. Detection mechanism; 21. Phased array ultrasonic probe; 22. Sliding rod; 23. Pin; 231. Ventilation hole; 24. Turntable; 25. First probe holder; 26. Second probe holder; 27. Injection head;

[0031] 30. Test sample; 31. First test piece; 32. Second test piece; 33. Sealing surface;

[0032] 40. Pressure sensor; 41. Thrust bearing. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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 ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] like Figures 1 to 5 As shown, a device for testing the sealing property of an oil casing sample comprises: a test bench 10 having a base 11 capable of placing a test sample 30, wherein the test sample 30 comprises a first sample piece 31 and a second sample piece 32 sleeved on the first sample piece 31, and the first sample piece 31 can contact the second sample piece 32 to form a sealing surface 33; a detection mechanism 20, located above the test bench 10, and the detection mechanism 20 has at least one phased array ultrasonic probe 21 capable of rotating around the outer circumference of the second sample piece 32, and the at least one phased array ultrasonic probe 21 is arranged toward the sealing surface 33.

[0037] In the oil casing sample sealing detection device described in the present invention, a sealing surface 33 simulating the oil casing thread contact surface is formed between the first sample piece 31 and the second sample piece 32, and the sealing condition of the sealing surface 33 is detected by the phased array ultrasonic probe 21, thereby simulating the phased array ultrasonic oil casing airtightness detection process.

[0038] The oil casing sample sealing detection device of the present invention can simulate the contact conditions of the sealing surfaces 33 of oil casing with different specifications and different thread types by changing the contact surface angle, contact length and surface treatment method between the first sample piece 31 and the second sample piece 32, and perform detection through the phased array ultrasonic probe 21 on the detection mechanism 20, thereby simulating the phased array ultrasonic oil casing air sealing detection process under different working conditions.

[0039] The oil casing sample sealing test device described in the present invention can be used for experimental research on the principle of phased array ultrasonic detection of metal contact sealing, and can provide device support for further realizing the establishment of phased array ultrasonic detection of threaded oil casing gas sealing detection standards based on the phased array ultrasonic signal characteristics of metal contact sealing of specific buckle types.

[0040] The structures of the experimental bench 10, the detection mechanism 20 and some preferred implementations of the present invention will be described in detail below.

[0041] First, if Figure 4As shown, the test bench 10 of the present invention is a test platform for simulating a threaded joint of an oil casing, and the first specimen 31 and the second specimen 32 are both fixedly arranged on the base 11 of the test bench 10. The base 11 is a cylindrical structure, and the first specimen 31 and the second specimen 32 are both cylindrical components with a top seal and a bottom opening. The first specimen 31 is sleeved on the base 11 through the bottom opening, and the inner diameter of the second specimen 32 is the same as the outer diameter of the first specimen 31. The second specimen 32 is sleeved on the outer peripheral side of the first specimen 31 through the bottom opening. A sealing surface 33 is formed between the inner wall of the second specimen 32 and the top of the side wall of the first specimen 31, and the sealing surface 33 can simulate the contact surface of the threaded connection of the oil casing.

[0042] According to one embodiment of the present invention, Figure 4 As shown, the inner wall of the second sample 32 has an inner conical surface, and the top of the outer wall of the first sample 31 has an outer conical surface, and the inner conical surface contacts the outer conical surface to form a sealing surface 33. The inner wall of the second sample 32 has a first inner wall surface and a second inner wall surface adjacently arranged along its axial direction, the diameter of the first inner wall surface is larger than the diameter of the second inner wall surface, and the first inner wall surface is close to the bottom opening of the second sample 32; wherein, an inner conical surface with one end for transition is formed between the first inner wall surface and the second inner wall surface. An outer conical surface that can match the inner conical surface is provided on the outer side wall of the top of the first sample 31, and the first sample 31 inserted from the bottom opening of the second sample 32 can axially abut against the inner conical surface, so that the outer conical surface and the inner conical surface are closely fitted to simulate the sealing surface 33 of the threaded connection of the oil casing.

[0043] Furthermore, in order to study the sealing conditions of the sealing surfaces 33 of oil casing with different specifications and different thread types, in the actual experimental process, multiple groups of first test pieces 31 and second test pieces 32 can be prepared in advance, and the angle, contact length and surface treatment method of the sealing surface 33 formed on each group of test samples 30 can be determined according to specific experimental requirements, thereby simulating the phased array ultrasonic oil casing air seal detection process under different working conditions.

[0044] According to one embodiment of the present invention, Figures 1 to 4 As shown, the test bench 10 has a first flange 13 and a second flange 14 connected by connecting bolts 15 , the first flange 13 is connected to the base 11 , and the second specimen 32 is clamped to the second flange 14 .

[0045] Specifically, Figure 1 and Figure 4As shown, the first flange 13 and the second flange 14 are arranged at intervals along the axial direction of the first sample 31, and the first flange 13 and the second flange 14 are connected together by a plurality of connecting bolts 15. An installation space for the sample 30 to be tested is formed between the first flange 13 and the second flange 14. The first flange 13 is a circular disc-shaped structure, and a base 11 is connected to the side of the first flange 13 close to the second flange 14, and the first sample 31 is placed on the base 11; the second flange 14 is an annular structure with a central opening, and a positioning step is formed on the side wall of the central hole of the second flange 14, and a convex ring is provided on the circumferential outer side of the bottom opening of the second sample 32, and the second sample 32 can pass through the upper central hole of the second flange 14 and abut against the positioning step through the convex ring, thereby realizing the positioning of the second sample 32.

[0046] When the experimental bench 10 described in the present invention is installed, the base 11 is first connected to the first flange 13, and then the first specimen 31 is placed on the base 11, and then the second specimen 32 is sleeved on the first specimen 31, and then the second flange 14 is sleeved on the outside of the second specimen 32, and the convex ring is pressed against the positioning step, and finally the first flange 13 and the second flange 14 are connected together by the connecting bolts 15, so that the first specimen 31 and the second specimen 32 are tightly pressed together axially.

[0047] Further, such as Figure 1 and Figure 4 As shown, a thrust bearing 41 is connected to the side of the first flange 13 away from the second flange 14; the thrust bearing 41 at the bottom of the test bench 10 ensures the stability of the test bench 10 during the experiment, thereby improving the accuracy of the test structure.

[0048] According to one embodiment of the present invention, Figures 1 to 4 As shown, a propulsion mechanism 12 is connected to the base 11, and the first sample 31 can be in close axial contact with the second sample 32 under the action of the propulsion mechanism 12. The propulsion mechanism 12 can provide a propulsion force along the axial direction of the first sample 31, thereby making the first sample 31 and the second sample 32 in close axial contact, thereby generating contact pressure on the sealing surface 33, thereby simulating the actual action surface of the threaded connection of the oil production casing.

[0049] Specifically, Figure 4As shown, the propulsion mechanism 12 is connected between the second flange 14 and the base 11. In this embodiment, the propulsion mechanism 12 is a hydraulic jack, and the hydraulic jack is connected to a manual hydraulic pump (not shown in the figure). The manual hydraulic pump is used to generate a vertical upward displacement thrust of the hydraulic jack, so that the first specimen 31 generates an upward thrust, thereby causing the outer conical surface of the first specimen 31 and the inner conical surface of the second specimen 32 to contact each other and generate contact pressure; during the experiment, the contact pressure on the sealing surface 33 can also be changed by adjusting the manual hydraulic pump, thereby simulating the sealing surface 33 of the threaded connection of the oil casing under different working conditions.

[0050] According to one embodiment of the present invention, Figures 1 to 4 As shown, a pressure sensor 40 is connected to the propulsion mechanism 12 ; the contact pressure on the sealing surface 33 between the first sample piece 31 and the second sample piece 32 is monitored by the pressure sensor 40 .

[0051] Specifically, Figure 4 As shown, the pressure sensor 40 is disposed between the propulsion mechanism 12 and the base 11 , and the thrust of the output shaft of the hydraulic jack is transmitted to the base 11 through the pressure sensor 40 , and then acts on the first specimen 31 and the second specimen 32 through the base 11 .

[0052] Secondly, if Figure 1 and Figure 5 As shown, the detection mechanism 20 described in the present invention can perform ultrasonic detection on the sealing surface 33 formed between the first sample 31 and the second sample 32 on the experimental bench 10. The detection mechanism 20 is arranged above the experimental bench 10. The phased array ultrasonic probe 21 on the detection mechanism 20 can rotate around the outer circumference of the second sample 32, and then perform sealing detection on the entire annular sealing surface 33; the phased array ultrasonic probe 21 is connected to the phased array detector (not shown in the figure), and the phased array detector is used to receive and analyze the data detected by the phased array ultrasonic probe 21.

[0053] According to one embodiment of the present invention, Figures 1 to 5 As shown, the detection mechanism 20 has at least one slide bar 22 , at least one end of the slide bar 22 is connected to a phased array ultrasonic probe 21 , and the slide bar 22 is rotatably connected to the top end of the second sample piece 32 .

[0054] Specifically, Figure 1 and Figure 3As shown, a pin 23 is provided at the top of the second specimen 32, and the pin 23 is located at the top center of the second specimen 32. The extension direction of the pin 23 coincides with the axial direction of the second specimen 32 (the pin 23 is arranged in the vertical direction). The slide bar 22 on the detection mechanism 20 is rotatably connected to the pin 23 through a turntable 24, and the axial direction of the slide bar 22 is perpendicular to the axial direction of the pin 23 (the slide bar 22 is arranged in the horizontal direction). In this embodiment, two parallel slide bars 22 are arranged in the turntable 24, and the lengths of the two ends of the slide bars 22 extending from both sides of the turntable 24 are the same, and the pin 23 is rotatably arranged at the center of the turntable 24; the detection mechanism 20 connected to the second specimen 32 is symmetrically arranged to ensure that the contact stress between the phased array ultrasonic probe 21 connected at both ends of the slide bar 22 and the outer surface of the second specimen 32 is uniform.

[0055] In other embodiments of the present invention, the connection position of the detection mechanism 20 is not limited to the top of the second sample piece 32. A rotating support frame can be separately provided for rotationally connecting with the detection mechanism 20, as long as it can be ensured that the phased array ultrasonic probe 21 on the detection mechanism 20 can rotate around the outer circumference of the second sample piece 32.

[0056] According to one embodiment of the present invention, one end of the sliding rod 22 is connected to the phased array ultrasonic probe 21, and the other end is connected to a counterweight block with the same weight as the phased array ultrasonic probe 21, so as to ensure the balance of both ends of the sliding rod 22 and thereby improve the stability of the rotation process of the detection mechanism 20.

[0057] Better, such as Figure 1 and Figure 5 As shown, the two ends of the slide rod 22 are respectively connected to the first probe frame 25 and the second probe frame 26, the first probe frame 25 and the second probe frame 26 are located on the outer peripheral side of the second sample piece 32, there are two phased array ultrasonic probes 21, and the first probe frame 25 and the second probe frame 26 are respectively connected to a phased array ultrasonic probe 21.

[0058] According to one embodiment of the present invention, Figure 1 As shown, an injection head 27 for placing coupling agent is connected to the first probe holder 25 or the second probe holder 26, and the injection head 27 is arranged toward the gap between the second sample piece 32 and the phased array ultrasonic probe 21. When the coupling agent is injected into the injection head 27, when the phased array ultrasonic probe 21 performs circumferential scanning, the coupling agent in the injection head 27 can flow out along the outer side surface of the second sample piece 32 to ensure that the ultrasonic wave excited by the phased array ultrasonic probe 21 can penetrate the outer wall surface of the second sample piece 32, thereby detecting the sealing surface 33 between the first sample piece 31 and the second sample piece 32.

[0059] According to one embodiment of the present invention, a tension spring is connected between the first probe frame 25 and the second probe frame 26. The tension generated by the tension spring causes the phased array ultrasonic probe 21 to contact the outer surface of the second sample 32.

[0060] According to one embodiment of the present invention, Figure 4 As shown, a vent hole 231 connected to a gas source is provided on the side wall of the second sample 32, and an acoustic wave sensor is connected to the second flange 14. High-pressure gas is introduced into the closed chamber formed between the first sample 31 and the second sample 32 through the gas source, and the acoustic wave sensor arranged on the second flange 14 monitors whether there is gas leakage from the closed chamber.

[0061] Specifically, in this embodiment, in order to reduce the number of openings on the second sample piece 32, the vent hole 231 is opened on the pin 23, so that the pin 23 can connect the internal space and the external space of the second sample piece 32 while being used to install the detection mechanism 20, and the vent hole 231 on the pin 23 is connected to an air source (not shown in the figure). In other embodiments of the present invention, the vent hole 231 can be set at other positions and is not limited to being integrally formed in the pin 23.

[0062] As described above, when the oil casing sample sealing test device is assembled and tested, firstly, hydraulic oil is pumped into the hydraulic jack through a manual hydraulic pump to generate contact stress on the sealing surface 33 between the first sample 31 and the second sample 32, and the contact position between the phased array ultrasonic probe 21 and the second sample 32 is adjusted to ensure that the phased array detector connected to the phased array ultrasonic probe 21 can detect the sealing surface 33. The phased array ultrasonic probe 21 is rotated around the second sample 32 for one circle, and ultrasonic signals are collected to the phased array detector. At the same time, high-pressure gas is injected into the closed chamber between the first sample 31 and the second sample 32 from the vent hole 231, and it is determined whether there is gas leakage by the acoustic wave sensor.

[0063] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for testing the sealing performance of oil casing samples. It is characterized in that include: A test bench, having a base capable of placing a sample to be tested, wherein the sample to be tested comprises a first sample piece and a second sample piece sleeved on the first sample piece, and the first sample piece can contact the second sample piece to form a sealing surface; The detection mechanism is located above the experimental bench, and the detection mechanism has at least one phased array ultrasonic probe that can rotate around the outer circumference of the second sample piece, and at least one phased array ultrasonic probe is arranged toward the sealing surface.

2. The oil casing sample sealing test device according to claim 1, It is characterized in that The base is connected with a propulsion mechanism, the first sample piece is connected with the base, the second sample piece is clamped on the experimental bench, and the first sample piece can be in close axial contact with the second sample piece under the action of the propulsion mechanism.

3. The oil casing sample sealing test device according to claim 2, It is characterized in that The experimental bench also has a first flange and a second flange connected by bolts, the first flange is connected to the base, the propulsion mechanism is installed on the first flange, and the second sample piece is clamped with the second flange.

4. The oil casing sample sealing test device according to claim 3, It is characterized in that The propulsion mechanism is connected with a pressure sensor, and the second flange is connected with a sonic wave sensor.

5. The oil casing sample sealing test device according to any one of claims 1 to 4, It is characterized in that The detection mechanism has at least one sliding rod, at least one end of the sliding rod is connected to the phased array ultrasonic probe, and the sliding rod is rotatably connected to the top end of the second sample piece.

6. The oil casing sample sealing test device according to claim 5, It is characterized in that A pin is passed through the top end of the second sample piece, the axis of the slide bar is perpendicular to the axis of the pin, and the pin is rotatably connected to the slide bar via a turntable.

7. The oil casing sample sealing test device according to claim 5, It is characterized in that The two ends of the slide bar are respectively connected to a first probe rack and a second probe rack, the first probe rack and the second probe rack are located on the outer peripheral side of the second sample piece, there are two phased array ultrasonic probes, and one of the phased array ultrasonic probes is respectively connected to the first probe rack and the second probe rack.

8. The oil casing sample sealing test device according to claim 7, It is characterized in that An injection head capable of placing coupling agent is connected to the first probe frame or the second probe frame, and the injection head is arranged toward the gap between the second sample piece and the phased array ultrasonic probe.

9. The oil casing sample sealing test device according to claim 7, It is characterized in that A tension spring is connected between the first probe frame and the second probe frame.

10. The oil casing sample sealing test device according to claim 1, It is characterized in that The first sample has an inner conical surface on its inner wall, and the second sample has an outer conical surface on its outer wall top. The inner conical surface contacts the outer conical surface to form the sealing surface. The second sample has an air hole connected to an air source on its side wall.

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