CN102288503B - Testing machine for simulating erosion of high-pressure manifold - Google Patents

Abstract

The invention relates to an erosion testing machine for simulating a high-pressure manifold, which includes: a high-speed jet flow circulation system, which has a liquid supply device, and a nozzle connected to the liquid supply device; a main machine of the testing machine, which has at least a base frame, A water tank, a sample clamping mechanism and a bracket arranged on the base frame; among them, the sample clamping mechanism can be connected to the bracket in a swingable manner, the sample is fixed in the sample clamping mechanism, and the nozzle can erode the sample Spraying; the water tank is arranged at the lower part of the support to collect the erosion liquid discharged by the sample clamping mechanism; at least one of the support and the nozzle is movably arranged on the base frame. The erosion testing machine of the present invention can control and adjust the size of the tensile force through the hydraulic bolt tensioner in the laboratory, so that the sample can simulate the actual working conditions under the condition of bearing the axial and circumferential tensile stress up to 100MPa. The erosive wear of the erosive fluid on the high-pressure pipe fittings under high-pressure stress provides reliable test support for the failure mechanism of the construction components.

Description

A kind of erosion testing machine for simulating high pressure manifold

technical field

The invention relates to an erosion testing machine, in particular to an erosion testing machine for simulating a high-pressure manifold, which is used for simulating and testing the wear and erosion performance of high-pressure pipe fittings under high-pressure conditions.

Background technique

In oil and gas field stimulation operations, acid fracturing technology is usually used. The high-pressure fluid control components used in acid fracturing operations usually have to withstand a pressure of up to 100 MPa. The components must withstand great internal stress and high-speed flow The erosion and corrosion of sand-containing acid liquid, therefore, the high-pressure fluid control components are easily damaged during the working process, resulting in the leakage of high-pressure fluid in the pipe, resulting in production accidents.

At present, because it is difficult to carry out a real simulation test on a high-pressure working condition above 100 MPa, the known erosion machines do not consider the erosion test of the sample under such high tensile and compressive stress conditions. In the known technology, when testing the erosion performance of the sample, the sample is only placed under the erosion fluid for erosion, while the high-pressure fluid control element in the acid fracturing is subjected to the impact of sand-containing acid liquid with a pressure of up to 100 MPa. Erosion, the sample is eroded by fluid after bearing extremely high stress, and its working conditions are obviously different from those subjected to simple erosion. Because the known erosion machine is used for the specimen erosion test, the specimen is only subjected to erosion, but not to high pressure. Therefore, at present, the known technology lacks reliable test support for the failure mechanism of components in acid fracturing operations, resulting in It is impossible to study in depth, which seriously affects the construction progress and causes safety hazards.

In view of the defects in the above-mentioned known technologies, the inventor has developed the erosion testing machine for simulating high-pressure manifolds of the present invention based on years of experience in production design in this field and related fields, so as to effectively simulate the erosion and wear of high-pressure pipe fittings situation, to obtain reliable test data.

Contents of the invention

The object of the present invention is to provide an erosion machine, especially an erosion test machine for simulating a high-pressure manifold, which can apply axial and circumferential tensile stress to semicircular pipes and spray high-speed erosive fluid to simulate the actual conditions of high-pressure pipes. In order to make up for the lack of experimental research on the erosion and wear performance of high-pressure pipe fittings under acid fracturing conditions in oil stimulation operations.

For this reason, the present invention proposes an erosion testing machine simulating a high-pressure manifold, which at least includes: a high-speed jet flow circulation system, which has a liquid supply device, and a nozzle connected to the liquid supply device; the main machine of the test machine, whose It at least has a base frame, a water tank arranged on the base frame, a sample clamping mechanism and a bracket; wherein, the sample clamping mechanism is swingably connected to the bracket, and the sample is fixed on the sample In the clamping mechanism, the nozzle can perform erosive spraying on the sample; the water tank is arranged at the lower part of the support to collect the erosion liquid discharged from the sample clamping mechanism; the support and the At least one of the nozzles is movably arranged on the base frame.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein the sample clamping mechanism has a box, and a sample support member fixed in the box; the sample is against the sample support, and is fixedly connected with the box; two hoop-stretching plates are correspondingly arranged on both sides of the sample support, and the corresponding ends of the two hoop-stretching plates can be respectively connected to the The side wall of the sample is fixedly connected, and one end of an axially stretched plate can be fixedly connected with the top surface of the sample, and the other ends of the axially stretched plate and the two circumferentially stretched plates are respectively connected A force applying mechanism, the axial stretching plate and the two hoop stretching plates are rotatably fixedly connected with the box to form a force applying lever for applying tension to the sample.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein, the box body is a columnar body with a bottom, and an upper cover plate is provided on the top, and a front side wall corresponding to the sample support is provided with a There is an opening into which the nozzle can extend.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein an upper support plate is arranged on the top of the upper cover plate, and has a first fixing portion extending through the upper cover plate into the box, and The axial stretching plate is rotatably fixedly connected to the first fixing part.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein a front support plate is arranged on the outside of the box and corresponds to the sample support, and the front support plate has a The front support plate extends to the second fixed part and the third fixed part in the box, and the two hoop stretching plates are fixedly connected to the second and third fixed parts respectively in a rotatable manner; the front The support plate is provided with a slot matching the opening provided on the front side wall of the box.

The erosion testing machine for simulating high-pressure manifolds as described above, wherein, three supporting platforms corresponding to the axially stretched plates and the two circumferentially stretched plates are arranged in the box; The force mechanism includes three hydraulic bolt tensioners respectively penetrating and supported on the support platform, and a hydraulic pump connected with the hydraulic bolt tensioners. The three hydraulic bolt tensioners are respectively connected to the shaft The stretching plate and the two hoop stretching plates are connected.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein the bracket is movably arranged on the base frame; the bracket includes a bottom plate, and two supports are correspondingly arranged on the top of the bottom plate, The two corresponding sides of the box body are respectively connected to the support in a swingable manner through trunnions; the lower part of the bracket is provided with a fixing mechanism capable of fixing the bracket at a predetermined position of the base frame.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein two horizontal guide rails are arranged above the base frame, and the bracket is movably arranged on the guide rails; the fixing mechanism has A fixed side plate extending downwards, and a position fixing bolt that passes through the fixed side plate and can abut against the guide rail.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein more than one positioning hole is provided on the side wall of the box, and a through hole corresponding to the positioning hole is provided on the support A fixing pin can pass through the through hole and be inserted into the positioning hole, so as to fix the box at a specified position.

The above mentioned erosion testing machine for simulating high-pressure manifolds, wherein the base frame is provided with a fixed frame, and the nozzle can be adjusted up and down on the fixed frame.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein the base frame is provided with a track, and the fixed frame is movably arranged on the track to adjust the distance between the nozzle and the sample. distance, and the lower part of the fixed frame is provided with a fixing device capable of fixing the fixed frame at a specified position of the base frame.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein the sample is a semicircular pipe, and the sample support has a mounting part connected to the box, and the mounting part is far away from the One side of the nozzle is convexly provided with a convex arc-shaped support part matched with the semicircular pipe fitting, and an erosion liquid tank is provided in the middle of the support part.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein the liquid supply device includes a liquid storage tank, a pressure pump connected between the nozzle and the liquid storage tank, and the liquid storage tank is connected to the liquid storage tank. The water tank is connected to recover the erosion liquid discharged from the sample clamping mechanism.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein a protective cover is provided outside the sample clamping mechanism, and the protective cover is fixedly connected to the water tank.

The erosion testing machine for simulating a high-pressure manifold as described above, wherein the upper cover plate is smaller than the bottom area of the box body, and a reinforcing rib is provided between the upper cover plate and the side wall of the box body; Moreover, a protective cover is provided outside the sample clamping mechanism, and the protective cover is fixedly connected with the water tank.

Features and advantages of the present invention are:

The erosion testing machine for simulating high-pressure manifolds proposed by the present invention can control and adjust the magnitude of the tension through the hydraulic bolt tensioner in the laboratory, and can apply axial and circumferential pressure up to 100 MPa to the semicircular high-pressure straight pipe sample. Tensile stress is used to simulate the erosion and wear of the erosive fluid under actual working conditions on high-pressure pipe fittings under high-pressure stress in acid fracturing, and provide reliable test support for the failure mechanism of construction components to reduce safety during production. Hidden dangers, improve construction progress.

The present invention drives three hydraulic bolt tensioners through an ultra-high pressure hydraulic pump to apply about 10 tons of tension to the axially stretched plate and the two hoop-stretched plates. The plates are respectively rotated relative to the pin shaft, and using the principle of leverage, the ends of the axially stretched plate and the two circumferentially stretched plates respectively apply axial and circumferential tension to the sample fixedly connected thereto, and the tension is sufficient A tensile stress of 100 MPa is generated on a sample with a cross-sectional area of 1000 square millimeters. In this state, the nozzle 21 is used to erode and spray the sample 5, and the acid solution containing sand impacts the sample at a speed of about 20 m/s. During the test process, the angle and horizontal position of the sample clamping mechanism can be adjusted arbitrarily according to requirements, and the upper and lower positions of the nozzle can be adjusted arbitrarily. With the help of the structure of the present invention, various data in the test process can be collected in real time by the data acquisition system, and the erosion resistance and wear resistance of the sample under high stress state can be analyzed to analyze the performance of the sample under this working condition. In-depth study of the failure mechanism.

The erosion testing machine of the present invention can make the semicircular high-pressure straight pipe sample bear axial and vertical pressure up to 100 MPa by changing the test conditions in the laboratory, that is, by controlling and adjusting the tensile force on the sample through a hydraulic bolt tensioner. Circumferential tensile stress; adjust the angle of the sample by adjusting the angle relationship between the sample clamping mechanism and the bracket, and set the support or the fixing frame supporting the nozzle at different positions of the base frame, so that the sample (high pressure pipe) Erosion in different directions and speeds of high-pressure sandy acidification fluid effectively simulates the erosion and wear of high-pressure pipe fittings under the conditions of acidification and fracturing, and provides reliable test support for the failure mechanism of construction components to reduce production failures. Potential safety hazards, improve construction progress.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in,

Fig. 1 is the structural representation of the erosion testing machine of the simulated high-pressure manifold of the present invention;

Fig. 2 is the structural schematic diagram of the host machine of the erosion testing machine simulating the high-pressure manifold of the present invention;

Fig. 3 is the three-dimensional structure schematic diagram of the sample clamping mechanism of the erosion testing machine simulating the high-pressure manifold of the present invention;

Fig. 4 is the rear view diagram of the sample clamping mechanism of the erosion testing machine simulating the high-pressure manifold of the present invention;

Fig. 5 is a schematic diagram of the structure of the sample clamping mechanism after removing the casing of the erosion testing machine for simulating a high-pressure manifold of the present invention;

Fig. 6 is a three-dimensional structural schematic view of the sample support of the erosion testing machine simulating the high-pressure manifold of the present invention;

Fig. 7 is a schematic top view of the sample support of the erosion testing machine simulating the high-pressure manifold of the present invention;

Fig. 8 is a schematic diagram of the structure of a sample fixed in the erosion testing machine for simulating a high-pressure manifold of the present invention.

Explanation of reference numbers:

1. Main body of testing machine 10. Sample clamping mechanism 101. Cabinet 1010. Support table

1011, upper cover 1012, front side wall 1013, opening 1014, upper support plate

10141, the first fixed part 1015, the left and right side walls 1016, the front support plate 10161, the second fixed part

10162, the third fixed part 10160, slotting 1017, trunnion 1018, positioning hole

1019. Rib 102. Sample support 1020. Support part 1021. Installation part

1022. Erosion liquid tank 103. Ring stretching plate 1031, 1032, 1040, pin shaft

104. Axial tensile plate 105. Fixed pin 11. Base frame 110. Guide rail

12. Sink 13. Bracket 131. Bottom plate 132. Support

134. Fixed side plate 135. Position fixing bolt 2. High-speed jet circulation system

20. Liquid supply device 201. Liquid storage tank 202. Pipeline 203. Hydraulic pump

21. Nozzle 3. Force applying mechanism 30. Hydraulic pump

31, 32, 33, hydraulic bolt tensioner 4, protective cover 5, sample

51. Threaded hole 52. Through hole 6. Fixing frame 60. Fixing tube

61. Adjusting rod 62. Fixed sleeve 63. Fastening bolt

Detailed ways

The erosion testing machine for simulating high-pressure manifolds proposed by the present invention at least includes: a high-speed jet circulation system, which has a liquid supply device, and a nozzle connected to the liquid supply device; A water tank, a sample clamping mechanism and a support on the base frame; wherein, the sample clamping mechanism can be connected to the support in a swingable manner, and the sample is fixed in the sample clamping mechanism. The nozzle can perform erosive spraying on the sample; the water tank is arranged at the lower part of the bracket to collect the erosive liquid discharged from the sample clamping mechanism; at least one of the bracket and the nozzle can It is movably arranged on the base frame. The invention applies a high tensile force to the sample through the sample clamping mechanism, and conveniently adjusts the spatial position of the sample and the nozzle during the test, so as to obtain the erosion resistance of the sample at different positions and angles under high stress conditions. Fluid erosion performance. In addition, the testing machine of the present invention can conveniently recover and recycle the erosion liquid ejected from the nozzle, thereby reducing the testing cost.

Further, the sample clamping mechanism has a box, and a sample support fixed in the box; the sample is against the sample support and is fixedly connected with the box; two rings The stretching plates are correspondingly arranged on both sides of the sample support, and the corresponding ends of the two circumferential stretching plates can be fixedly connected to the side walls of the sample in the thickness direction, respectively. One end of the plate can be fixedly connected to the top surface of the sample, and the other ends of the axially stretched plate and the two circumferentially stretched plates are respectively connected to a force applying mechanism. The hoop stretching plate is rotatably fixedly connected with the box, constituting a force application lever for applying tension to the sample.

The erosion testing machine of the present invention can apply up to 10 tons of tensile force to the axial and circumferential directions of the sample through the axial stretching plate and the two circumferential stretching plates, so that the sample can withstand a tensile stress of 100 MPa. , when it is eroded by the high-speed sand-containing acid liquid ejected from the nozzle, the erosion and wear of the high-pressure pipe fittings are obtained.

Since the pressure of 100MPa is an extremely high pressure, in acid fracturing, such a high pressure can fracture the formation rock in oil drilling. In order to ensure the safety of the laboratory operation, reduce the cost of equipment, and obtain the erosion and wear of the pipe fittings under the actual compressive stress, the present invention adopts the method of applying tension to the sample to simulate the hydrostatic pressure under the actual working condition, and then Use high-speed fluid to erode the sample, so as to obtain reliable test data, in order to study the failure mechanism of pipe fittings in depth, and improve production efficiency and safety.

A feasible technical solution is that the bracket is movably arranged on the base frame; the bracket includes a bottom plate, two supports correspondingly arranged on the top of the bottom plate, and two corresponding sides of the box body They are respectively connected to the support in a swingable manner through trunnions; the lower part of the support is provided with a fixing mechanism capable of fixing the support at a predetermined position of the base frame.

Further, two horizontal guide rails are arranged above the base frame, and the bracket is movably arranged on the guide rails; the fixing mechanism has a fixed side plate extending downward along the bottom plate, and a penetrating The fixed side plate can abut against the fixing bolt at the position of the guide rail.

In addition, more than one positioning hole is provided on the side wall of the box, and a through hole corresponding to the positioning hole is provided on the support, and a fixing pin can pass through the through hole and be inserted In the positioning hole, the box is fixed at a specified position.

In addition, the base frame is provided with a fixing frame, and the nozzle can be adjusted up and down on the fixing frame.

In another optional embodiment, a track can also be set on the base frame, and the fixed frame can be movably arranged on the track to adjust the distance between the nozzle and the sample, and the The lower part of the fixing frame is provided with a mounting part capable of fixing the fixing frame at a predetermined position of the base frame.

The sample of the present invention is a semicircular pipe, and the sample support has a mounting part connected to the box, and the side of the mounting part away from the nozzle protrudes from the semicircular pipe. A matching convex arc-shaped support part, and an erosion liquid tank is arranged in the middle of the support part.

The liquid supply device includes a liquid storage tank, a pressure pump connected between the nozzle and the liquid storage tank, and the liquid storage tank is connected with the water tank to recover the liquid discharged from the sample clamping mechanism. Erosion fluid.

In order to have a clearer understanding of the technical features, purpose and effects of the present invention, the specific implementation, structure, features and functions of the erosion tester for simulating high-pressure manifolds of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments The description is as follows. In addition, through the description of the specific implementation, the technical means and effects of the present invention to achieve the intended purpose can be understood more deeply and specifically. However, the attached drawings are only for reference and illustration, and are not used to limit the present invention. .

Fig. 1 is a structural schematic diagram of the erosion testing machine of the simulated high-pressure manifold of the present invention; Fig. 2 is a schematic structural view of the host structure of the erosion testing machine of the simulated high-pressure manifold of the present invention; Fig. 3 is a schematic diagram of the erosion of the simulated high-pressure manifold of the present invention The schematic diagram of the three-dimensional structure of the sample clamping mechanism of the testing machine; Fig. 4 is a schematic diagram of the back view of the sample clamping mechanism of the erosion testing machine simulating the high pressure manifold of the present invention; Fig. 5 is the erosion of the simulated high pressure manifold of the present invention Schematic diagram of the structure of the sample clamping mechanism after the test machine removes the box body; Figure 6 is a schematic diagram of the three-dimensional structure of the sample support of the erosion tester simulating the high-pressure manifold of the present invention; Figure 7 is a schematic view of the simulated high-pressure manifold of the present invention Fig. 8 is a schematic diagram of the sample structure fixed in the erosion testing machine of the simulated high-pressure manifold of the present invention.

As shown in Fig. 1 and Fig. 2, the erosion testing machine of the simulated high-pressure manifold of the present invention at least includes: a high-speed jet circulation system 2, which has a liquid supply device 20, and a nozzle 21 connected to the liquid supply device; Machine main body 1, it has base frame 11 at least, be arranged on the water tank 12 on described base frame 11, sample clamping mechanism 10 and support 13; Wherein, described sample clamping mechanism 10 can swing and described support 13, the sample 5 is fixed in the sample clamping mechanism 10, and the nozzle 21 can erode and spray the sample; The erosion liquid discharged from the sample clamping mechanism 10 is transported to the liquid storage tank 201 of the liquid supply device 20 through pipelines for recycling. At least one of the bracket 13 and the nozzle 21 is movably arranged on the base frame 11 so as to adjust the distance between the nozzle 21 and the sample 5 and obtain test data under different position conditions.

Please refer to FIGS. 2-5 . In a feasible technical solution, the sample clamping mechanism 10 has a box body 101 and a sample support member 102 fixed in the box body 101 . The sample 5 abuts against the sample support 102 , and its bottom surface is fixedly connected with the box 101 . Two hoop-stretching plates 103 are correspondingly arranged on both sides of the sample support 102, and the corresponding ends of the two hoop-stretching plates 103 can be fixedly connected to the side walls of the sample 5 in the thickness direction respectively. , one end of an axially stretched plate 104 can be fixedly connected to the top surface of the sample 5, and the other ends of the axially stretched plate 104 and the two circumferentially stretched plates 103 are respectively connected to a force applying mechanism 3. The axial stretching plate 104 and the two hoop stretching plates 103 are rotatably fixedly connected to the box body 101 to form a force applying lever for applying tension to the sample 5 .

Further, the box body 101 is a column with a bottom. In a specific embodiment, the box body 101 is rectangular, and an upper cover plate 1011 is arranged on the top thereof, and the front side wall corresponding to the sample support member 102 1012 is provided with an opening 1013, and the nozzle 21 can extend into the opening 1013.

Wherein, the upper cover plate 1011 can be set to be smaller than the bottom area of the box body 101, so that there is a certain distance between the upper cover plate 1011 and the front side wall 1012, so as to facilitate the installation of the sample 5 and adjust the nozzle 21 The distance between the sample and the sample 5 can facilitate the observation of the erosion of the sample 5 during the test. In order to ensure the strength of the box body 101, a reinforcing rib 1019 is provided between the upper cover plate 1011 and the front side wall 1012 of the box body 101, as shown in FIG. 3 , on both sides of the sample 5. Two reinforcing ribs 1019 are provided.

An optional solution is that an upper support plate 1014 is arranged on the upper part of the upper cover plate 1011, and has a first fixing portion 10141 extending through the upper cover plate 1011 into the box body 101, the axial The stretching plate 104 is rotatably fixedly connected to the first fixing portion 10141 through a pin shaft 1040 .

A front support plate 1016 is arranged on the outside of the box body 101 and corresponds to the sample support member 102. The front support plate 1016 has a front side wall 1012 extending through the box body 101 and extending into the box body The second fixing part 10161 and the third fixing part 10162, the two hoop-stretching plates 103 are rotatably fixedly connected to the second and third fixing parts 10161 and 10162 through pin shafts 1031 and 1032 respectively; The front support plate 1016 is provided with a slot 10160 matching the opening 1013 provided on the front side wall 1012 of the box body.

During use, the axial stretching plate 104 and the two hoop stretching plates 103 rotate with the connection between the boxes 101 as the fulcrum, because the tension applied to each stretching plate is very large , so the connection is easy to damage, in order to facilitate the replacement and reduce the maintenance cost of the equipment, it is preferable to pass the axial tension plate 104 and the two hoop tension plates 103 respectively through the upper support plate 1014 and the front support plate 1016 and The box body 101 is connected, and the pin shafts 1031, 1032, 1040 connecting the axial stretching plate 104 and the two circumferential stretching plates 103 are fixed and supported by the upper support plate 1014 and the front support plate 1016. When the joint is damaged, the upper support plate 1014 or the front support plate 1016 can be easily removed from the box body 101 for replacement.

Furthermore, three supporting platforms 1010 corresponding to the axial stretching plate 104 and the two hoop stretching plates 103 are provided in the box body 101 . The force applying mechanism 3 includes three hydraulic bolt tensioners 31 , 32 , 33 respectively penetrating and supported on the support platform 1010 , and a hydraulic pump connected to the hydraulic bolt tensioners 31 , 32 , 33 30. The three hydraulic bolt tensioners 31, 32, and 33 are respectively connected to the axial stretching plate 104 and the two circumferential stretching plates 103, and can respectively tighten the axial stretching plate 104. Apply force to the two circumferential stretching plates 103 so that the axial stretching plate 104 and the two circumferential stretching plates 103 respectively use the first fixing part 10141, the second fixing part 10161 and the third fixing part 10162 Rotate as a fulcrum, so that the axial and circumferential tensile forces are applied to the sample through the connection ends of each stretching plate and the sample 5, respectively. Wherein, as shown in FIG. 5 , for example, the support platform can be set in a U shape, and the widths of the axially stretched plate 104 and the two hoop stretched plates 103 match the opening of the support platform 1010, and can be embedded in Therein, the structure of the supporting platform 1010 is not limited, as long as it can support each hydraulic bolt tensioner 31 , 32 , 33 .

In another optional solution, the support 13 is movably arranged on the base frame 11; the support 13 includes a bottom plate 131, which is arranged on the upper part of the bottom plate 131, and two corresponding supports 132 , the two corresponding sides of the box 101 are connected to the support 132 in a swingable manner through a trunnion 1017 respectively; the fixing mechanism.

Further, two horizontal guide rails 110 are arranged above the base frame 11, and the bracket 13 is movably arranged on the guide rails 110; the fixing mechanism has a fixed side plate 134 extending downward along the bottom plate 131, And a position fixing bolt 135 that passes through the fixed side plate 134 and can abut against the guide rail 110 .

The side wall of the box body 101 is provided with more than one positioning hole 1018, and the support 132 is provided with a through hole corresponding to the positioning hole 1018, and a fixing pin 105 can pass through the through hole And inserted into the positioning hole 1018, so as to fix the box 101 at a specified position.

In an optional solution, the base frame 11 is provided with a fixed frame 6, and the nozzle 21 is arranged on the fixed frame 6 so that it can be adjusted up and down.

In another optional solution, a track (not shown in the figure) can also be provided on the base frame 11, and the fixed frame 6 can be movably arranged on the track to adjust the nozzle 21 The distance from the sample 5, and the lower part of the fixed frame 6 is provided with a fixing device capable of fixing the fixed frame on the specified position of the base frame 11. The structure of the fixing device may be similar to the above-mentioned fixing mechanism, or other known structures may be used, as long as the fixing frame can be fixed at a specified position.

Further, as shown in FIGS. 6 and 7 , in order to facilitate the positioning of the sample 5 that is a semicircular pipe, the sample support 102 can be formed to have a mounting portion 1021 connected to the box 101 , The side of the mounting part 1021 away from the nozzle 21 is protruded with a convex arc-shaped support part 1020 matched with the semicircular pipe fitting. The support part 1020 is provided with an erosion liquid tank 1022 in the middle. 21 The sprayed erosive liquid passes through the erosive liquid tank 1022 to erode the sample 5 under high stress.

The accompanying drawings of the present invention only show an embodiment using a hydraulic bolt tensioner as a force application mechanism, but it is not limited thereto, as long as the mechanism that can apply high axial and hoop tension to the sample 5 Belong to the scope of protection of the invention. For example, the force applying mechanism can also adopt a known rack and pinion mechanism, that is, a gear mechanism is installed at the positions where the hydraulic bolt tensioners 31, 32, and 33 are arranged, and the gears are gradually meshed and tightened to achieve the effect of applying tension. . Through the mutual meshing effect between the rack and pinion, according to the well-known gear transmission theorem, a small force at one end of the gear can cause a large force at the other end of the gear, thereby exerting a high tensile force on the sample.

In addition, the liquid supply device 20 includes a liquid storage tank 201, a hydraulic pump 203 connected between the nozzle 21 and the liquid storage tank 201 through a pipeline 202, the liquid storage tank is connected to the water tank 12, to recover the erosion liquid discharged from the sample clamping mechanism 10 .

In order to ensure the safety of the test process, a protective cover 4 can be installed outside the main body 1 of the testing machine. In a specific embodiment, as shown in Figure 1, the protective cover 4 is arranged on the sample clamping mechanism 10, the bottom periphery of the protective cover 4 is fixedly connected with the periphery of the water tank 12.

The erosion testing machine for simulating a high-pressure manifold proposed by the present invention is used to detect the wear performance of a tubular sample under high stress conditions. The erosion testing machine is composed of a testing machine host 1 and a high-speed jet circulation system 2 . In a specific embodiment, the main body 1 of the testing machine has a base frame 11, a water tank 12, a sample clamping mechanism 10, a bracket 13 and a protective cover 4 from bottom to top, wherein the sample clamping mechanism 10 is installed on On the two parallel horizontal guide rails 110 above the base frame 11, it can be moved back and forth along the horizontal guide rails 110 to an appropriate position, through a fixed side plate 134 extending downwards along the bottom plate 131 of the support 13, and a fixed side plate passing through the fixed side plate. 134 can be fixed against the position fixing bolt 135 of the guide rail 110 . The sample clamping mechanism 10 has a box body 101, and the box body 101 is provided with an axial tension plate 104 and two circumferential tension plates 103, and the axial tension plate 104 The two hoop-stretching plates 103 are fixed on the box body 101 by three different pin shafts 1040, 1031, 1032. One end of the three stretching plates is fixedly connected with the sample 5 fixed in the box and against the sample support 102, and the other end is respectively connected with three hydraulic bolt tensioners 31, 32, 33 connected, the hydraulic bolt tensioners 31, 32, 33 are respectively installed on the box body through three support platforms 1010 fixed in the box body 101, and the tension force is applied by the ultra-high pressure hydraulic pump 30, and the tension force is applied by the lever of the stretch plate. The action applies a load to sample 5. The above-mentioned water tank 12 is installed on the base frame 11, and the protective cover 4 and the water tank 12 are connected by bolts to protect the entire sample clamping mechanism 10.

The above-mentioned box 101 can be welded by thick steel plates, has high strength, and provides support for each stretching plate 104, 103 and hydraulic bolt tensioners 31, 32, 33. As shown in Figure 3, the box body 101 has an upper cover plate 1011, a front side wall 1012, left and right side walls 1015, an upper support plate 1014, a front support plate 1016, and between the upper cover plate 1011 and the front side wall 1012. The reinforcement ribs 1019 and the hydraulic bolt tensioner support platform 1010 are set, and the aforementioned components are all connected by welding at the joints. The upper supporting plate 1014 is inserted in the slotted hole provided on the upper cover plate 1011, the front supporting plate 1016 is inserted in the slotted hole provided on the front side wall 1012, and the upper supporting plate 1014 has a second hole extending into the box body 101. A fixed part 10141, the axially stretched plate 104 is rotatably fixedly connected to the first fixed part 10141 through a pin shaft 1040; the front support plate 1016 has a second fixed part 10161 extending into the box body 101 and the third fixing part 10162, the two hoop-stretching plates 103 are rotatably fixedly connected to the second and third fixing parts 10161 and 10162 through pin shafts 1031 and 1032 respectively.

The above-mentioned bracket 13 has a bottom plate 131, left and right supports 132, and a fixed side plate 134 extending downward along the bottom plate 131. The described sample clamping mechanism 10 is connected with the bracket 13 through a trunnion 1017, and can be wound around the trunnion. 1017 rotation, after rotating to the required angle, the fixed pin 105 can pass through the through hole on the left and right support 132 and insert it in the positioning hole 1018 provided on the left and right side walls 1015 of the box, so that the sample The clamping mechanism 10 is fixed at a prescribed angle. By adjusting the angle of the sample clamping mechanism 10, the sample 5 can be eroded at different impact angles, so that the influence of different eroding angles on the erosion of the sample 5 can be studied and analyzed. The bracket 13 can be fixed at different positions of the base frame 11 by the position fixing bolt 135 and the fixed side plate 134 to adjust the distance between the erosion liquid ejected from the nozzle 21 and the sample 5 to achieve different test effects.

The fixed frame 6 for supporting the nozzle 21 has a fixed tube 60, an adjustment rod 61, a fixed sleeve 62 and a fastening bolt 63, wherein the fixed tube 60 can be welded on the base frame 11 (in another embodiment, the fixed tube 60 It is also possible to move and be arranged on the track provided on the pedestal 11, and can be fixed at a specified position), the adjusting rod 61 is inserted in the fixed pipe 60, and after adjusting the proper height up and down, it can be fixed by the fastening bolt 63. The fixing sleeve 62 can be two semicircles for clamping and fixing the nozzle 21 .

Sample 5, as shown in Figure 8, is a semicircular straight pipe. For the convenience of clamping, five threaded holes 51 are respectively punched on the upper and lower sides of the sample 5, and four through holes 52 are punched on the left and right sides respectively. The upper end of the sample 5 is fixedly connected to the axial tension plate 104 by 5 bolts, the lower end is fixedly connected to the box body 101 by 5 bolts, and 4 screws penetrate the left and right side walls of the sample 5 and the The two hoop tensile plates 103 are fixedly connected, and the inner ring surface of the sample 5 is pressed against the support portion 1020 of the sample support 102 .

The working principle of the present invention is: fix the sample clamping mechanism 10 and the nozzle 21 with the sample 5 fixed on the specified position of the base frame 11 , cover and fix the protective cover 4 on the water tank 12 . Start the ultra-high pressure hydraulic pump 30 to drive three hydraulic bolt tensioners 31, 32, 33 to apply tension to the axial stretching plate 104 and the two hoop stretching plates 103, and the axial stretching plate 104 and the two hoop stretching plates 104 The stretching plate 103 rotates relative to the pin shafts 1040, 1031, and 1032 respectively. Using the principle of leverage, the ends of the axial stretching plate 104 and the two circumferential stretching plates 103 are fixedly connected to the sample 5 respectively. Axial and circumferential tension are applied, and the sand-containing acid liquid is drawn out from the liquid storage tank 201 by the hydraulic pump 203, and the sample 5 is eroded and sprayed by the nozzle 21, and the sprayed fluid is collected by the protective cover 4 and the water tank 12 Return to the liquid storage tank 201. During the test process, the angle and horizontal position of the sample clamping mechanism 10 can be adjusted arbitrarily according to requirements, and the upper and lower positions of the nozzle 21 can be adjusted arbitrarily. During the erosion process, the data acquisition system collects various data in the test process in real time, and analyzes the erosion resistance and wear resistance of sample 5 under high stress state, so as to analyze the performance of the sample under this working condition. In-depth study of the failure mechanism. The erosion testing machine of the present invention can control and adjust the tensile force on the sample 5 through the hydraulic bolt tensioners 31, 32, and 33 in the laboratory, and apply an axial force of up to 100 MPa to the semicircular high-pressure straight pipe sample. and the circumferential tensile stress; and adjust the angle of the sample 5 by adjusting the angle relationship between the sample clamping mechanism 10 and the support 13, by setting the support 13 or the fixed frame 6 supporting the nozzle 21 at different positions of the base frame 11 , so that sample 5 is subjected to erosion in different directions and speeds, effectively simulating the erosion and wear of high-pressure pipe fittings under acid fracturing conditions, providing reliable test support for the failure mechanism of construction components, and reducing production potential safety hazards and improve construction progress.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention. And it should be noted that each component of the present invention is not limited to the above-mentioned overall application, and each technical feature described in the description of the present invention can be selected to be used alone or in combination according to actual needs. Therefore, the present invention Other combinations and specific applications related to the invention of this case are naturally covered.

Claims (15)

1. An erosion testing machine simulating a high pressure manifold, characterized in that the erosion testing machine at least comprises: A high-speed jet circulation system, which has a liquid supply device, and a nozzle connected to the liquid supply device; The main body of the testing machine has at least a base frame, a water tank, a sample clamping mechanism and a bracket arranged on the base frame; wherein, the sample clamping mechanism is swingably connected to the bracket, and the sample is fixed In the sample clamping mechanism, the nozzle can perform erosive spraying on the sample; the water tank is arranged at the lower part of the support to collect the erosion liquid discharged by the sample clamping mechanism; At least one of the bracket and the nozzle is movably arranged on the base frame; The sample clamping mechanism has a box body, and a sample support member fixed in the box body; the sample is against the sample support member and is fixedly connected with the box body; Stretching plates are correspondingly arranged on both sides of the sample support, and the corresponding ends of the two hoop stretching plates can be fixedly connected to the side walls of the sample in the thickness direction respectively. One end can be fixedly connected with the top surface of the sample, the other ends of the axial stretching plate and the two circumferential stretching plates are respectively connected with a force applying mechanism, the axial stretching plate, the two The hoop stretching plate is rotatably fixedly connected with the box body, constituting a force applying lever for applying tension to the sample. 2. The erosion testing machine for simulating a high-pressure manifold according to claim 1, wherein the box body is a columnar body with a bottom, and its top is provided with an upper cover plate, which is connected to the sample support. An opening is provided on the corresponding front side wall, and the nozzle can extend into the opening. 3. The erosion testing machine for simulating a high pressure manifold according to claim 2, wherein an upper support plate is arranged on the top of the upper cover plate, and has a support plate extending through the upper cover plate into the box. The first fixing part of the axial stretching plate is rotatably fixedly connected with the first fixing part. 4. The erosion testing machine simulating a high-pressure manifold according to claim 2, wherein a front support plate is arranged on the outside of the box body, and corresponds to the sample support member, and the front support plate The plate has a second fixed part and a third fixed part extending through the front support plate of the box body into the box body, and the two hoop-stretched plates are respectively rotatable with the second and third fixed parts The ground is fixedly connected; the front support plate is provided with a slot matching the opening provided on the front side wall of the box body. 5. The erosion testing machine for simulating a high-pressure manifold according to claim 1, wherein the force applying mechanism is a hydraulic drive mechanism or a rack and pinion mechanism. 6. The erosion testing machine for simulating a high-pressure manifold according to claim 5, wherein, the box body is also provided with three corresponding to the axial tension plate and the two circumferential tension plates. The supporting platform; the force applying mechanism includes three hydraulic bolt tensioners respectively penetrating and supported on the supporting platform, and a hydraulic pump connected with the hydraulic bolt tensioners, the three hydraulic bolt tensioners The stretcher is respectively connected with the axial stretching plate and the two hoop stretching plates. 7. The erosion testing machine for simulating a high-pressure manifold according to claim 1, wherein the support is movably arranged on the base frame; The support on the upper part of the bottom plate, the two corresponding sides of the box body are connected to the support in a swingable manner through the trunnions respectively; positional fixation mechanism. 8. The erosion testing machine simulating a high-pressure manifold according to claim 7, wherein two horizontal guide rails are arranged above the base frame, and the support is movably arranged on the guide rails; The fixing mechanism has a fixed side plate extending downwards along the bottom plate, and a position fixing bolt that passes through the fixed side plate and can abut against the guide rail. 9. The erosion testing machine for simulating a high-pressure manifold according to claim 7, wherein more than one positioning hole is provided on the side wall of the box, and the support is provided with a A through hole corresponding to the positioning hole, a fixing pin can pass through the through hole and be inserted into the positioning hole, so as to fix the box at a specified position. 10 . The erosion testing machine for simulating a high-pressure manifold according to claim 1 , wherein a fixed frame is provided on the base frame, and the nozzle is arranged on the fixed frame so that it can be adjusted up and down. 11 . 11. The erosion testing machine for simulating a high-pressure manifold according to claim 10, wherein a track is provided on the base frame, and the fixed frame is movably arranged on the track to adjust the The distance between the nozzle and the sample, and the lower part of the fixed frame is provided with a fixing device capable of fixing the fixed frame at a specified position of the base frame. 12. The erosion testing machine for simulating a high-pressure manifold according to claim 1, wherein the sample is a semicircular pipe, and the sample support has a mounting portion connected to the box , the side of the installation part away from the nozzle is protrudingly provided with a convex arc-shaped support part matched with the semicircular pipe fitting, and an erosion liquid tank is provided in the middle of the support part. 13. The erosion testing machine simulating a high-pressure manifold according to claim 1, wherein the liquid supply device comprises a liquid storage tank, a pressure pump connected between the nozzle and the liquid storage tank, the The liquid storage tank is connected with the water tank to recover the erosion liquid discharged from the sample clamping mechanism. 14. The erosion testing machine for simulating a high-pressure manifold according to claim 1, wherein a protective cover is provided outside the sample clamping mechanism, and the protective cover is fixedly connected with the water tank. 15. The erosion testing machine for simulating a high-pressure manifold according to claim 2, wherein the upper cover plate is smaller than the bottom area of the box body, and the upper cover plate and the side wall of the box body Reinforcing ribs are provided between them; and a protective cover is provided outside the sample clamping mechanism, and the protective cover is fixedly connected with the water tank.

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