Corrosion resistance detection equipment for oil and gas pipeline

Abstract

The invention discloses oil and gas pipeline corrosion resistance detection equipment, and belongs to the field of pipeline corrosion resistance detection. Oil and gas pipeline corrosion resistance detection equipment comprises a detection box, push-pull rods are slidably connected to the two sides of the inner wall of the detection box correspondingly, clamping bases are fixedly connected to the inner ends of the push-pull rods on the two sides correspondingly, and a pipeline body is installed between the clamping bases on the two sides; a driving part for pushing the clamping seat to fix the pipeline body is arranged on the detection box; through rotation of the guide vanes, oil field water simulation liquid continuously and circularly flows through the interior of the pipeline body, meanwhile, the pipeline body is rotated in cooperation with the arrangement of the cross clamping rod, the cross groove sleeve rod and the belt pulley set, the dynamic environment of the oil and gas pipeline in actual use is more accurately simulated, better corrosion detection simulation is achieved, and the test efficiency is improved. More accurate corrosion data can be obtained, and the reliability of an experimental result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline corrosion resistance detection, and particularly relates to an oil and gas pipeline corrosion resistance detection device. Background Art

[0002] As an important infrastructure for energy transmission, the safety and reliability of oil and gas pipelines are directly related to the security of energy supply. However, due to their long-term exposure to complex geological and chemical environments, oil and gas pipelines face serious corrosion threats, which not only cause huge economic losses, but may also lead to environmental pollution and even safety accidents. Therefore, effective corrosion resistance detection of oil and gas pipelines is particularly important.

[0003] At present, the existing detection equipment has certain limitations. Traditional corrosion resistance detection is usually carried out under normal temperature and pressure, and it cannot accurately reflect the corrosion situation of oil and gas pipelines under actual extreme conditions such as high pressure and high temperature, ignoring the influence of factors such as fluid flow and pressure change on the corrosion process, resulting in a deviation between the experimental results and the actual situation, and thus reducing the reliability of the experimental results. Therefore, an oil and gas pipeline corrosion resistance detection device is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that in the prior art, the influence of factors such as fluid flow and pressure change on the corrosion process is ignored, resulting in a deviation between the experimental results and the actual situation, and thus reducing the reliability of the experimental results, and to propose an oil and gas pipeline corrosion resistance detection device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme: An oil and gas pipeline corrosion resistance detection device, including a detection box, both sides of the inner wall of the detection box are slidably connected with push-pull rods, the inner ends of both push-pull rods are fixedly connected with clamping seats, a pipeline body is installed between the two clamping seats, and a driving part for pushing the clamping seats to fix the pipeline body is arranged on the detection box. It further includes: a liquid guide cylinder, the liquid guide cylinder is fixedly connected to the outer wall of the detection box, a liquid storage tank is fixedly connected to the top of the detection box, and the liquid storage tank is communicated with the liquid guide cylinder through a first conduit. Among them, a diversion part for pushing the liquid in the liquid guide cylinder into the pipeline body for circulating flow is arranged on the detection box; two air guide boxes, the two air guide boxes are respectively fixed on two symmetric side walls of the detection box and are distributed staggeredly left and right, the two air guide boxes are communicated with each other through an air guide pipe, and the top of one of the air guide boxes is communicated with the top inner cavity of the liquid storage tank through an inflation pipe. Among them, an inflation part for filling the gas in the air guide box into the liquid storage tank is arranged in the detection box.

[0006] In order to facilitate the fixation of the pipeline body, preferably, the driving part includes a reciprocating screw, and both sides of the detection box are fixedly connected to the limit boxes, the reciprocating screw passes through the detection box and is rotatably connected to the limit boxes on both sides, a first motor is fixedly connected to the outer wall of the limit box on one side, the output shaft of the first motor is fixedly connected to the end of the reciprocating screw, the outer end of the push-pull rod is rotatably connected to a movable plate, the lower end of the movable plate is threadedly sleeved on the reciprocating screw, and the threads of the reciprocating screw in the limit boxes on both sides are in opposite directions.

[0007] In order to improve the detection effect, preferably, the guide part includes a guide box, which is fixed on the outer wall of the detection box, and a drive shaft is rotatably connected inside the guide box, and a guide blade is fixedly connected to the drive shaft, and a second motor is fixedly connected to the side wall of the guide box, and the output shaft of the second motor is fixedly connected to the end of the drive shaft, the guide box and the liquid guide cylinder are connected through a second conduit, and a liquid guide groove is connected in the clamping seat, the push-pull rod and the movable plate, the guide box and the liquid guide groove are connected through a third conduit, and the liquid guide cylinder and the liquid guide groove on the other side are connected through a fourth conduit.

[0008] Furthermore, one end of the driving shaft passes through the outside of the guide box and is fixedly connected with a cross clamp rod, a cross groove sleeve rod is slidably sleeved on the cross clamp rod, and the cross groove sleeve rod is connected to the push-pull rod through a pulley group.

[0009] Furthermore, a limiting groove is provided in the cross clamping rod, the limiting groove horizontally penetrates to the outside of the pulley assembly, and a limiting rod is inserted into the limiting groove, and the other end of the limiting rod is fixed on the side wall of the guide box.

[0010] In order to simulate a real scene, preferably, a heater is fixedly connected to the outer wall of the detection box, and an electric heating tube is fixedly connected inside the detection box, and the electric heating tube is connected to the output end of the heater.

[0011] In order to improve the energy-saving effect, preferably, the top of the liquid storage tank and the bottom of the liquid guiding tube are connected through a fifth conduit, a liquid pump is installed on the fifth conduit, the liquid pump is fixed on the detection box, and solenoid valves are provided in the first conduit and the fifth conduit.

[0012] In order to improve the representativeness of the test results, preferably, the inflation part includes two groups of piston plates, and the two groups of piston plates are slidably connected in the two groups of air guide boxes respectively, and the side of the piston plate facing the inner cavity of the detection box is fixedly connected with an oblique push plate, and the inclined surfaces of the two groups of oblique push plates are parallel to each other, and a return spring is fixedly connected between the other side of the piston plate and the inner wall of the air guide box, the side wall of the clamping seat is fixedly connected with a push rod, and a one-way valve is arranged in the inflation tube.

[0013] In order to improve the liquid mixing effect in the detection box, preferably, a liquid suction box is fixedly connected to the side wall of the detection box, a liquid suction pipe is fixedly connected and communicated with the side wall of the detection box, the other end of the liquid suction pipe is communicated with the upper part of the inner cavity of the liquid suction box, a suction pipe is fixedly connected and communicated with the top of one group of the air guide boxes, a one-way valve is arranged in the suction pipe, a drainage pipe is fixedly connected to the inner wall of the detection box, the drainage pipe is communicated with the lower part of the inner cavity of the liquid suction box, and a one-way valve is arranged in the pipeline connecting the drainage pipe and the liquid suction box.

[0014] A method for detecting the corrosion resistance of an oil and gas pipeline comprises the following steps: Step 1: Cut a pipeline body with a corresponding length and clamp it between the two clamping seats on both sides; Step 2: Add a soil environment simulation liquid into the detection box and heat it; Step 3: Introduce the oilfield water simulation liquid in the liquid storage tank into the pipeline body and make the oilfield water simulation liquid circulate; Step 4: Pressurize the oilfield water simulation liquid during the liquid circulation and rotate the pipeline body; Step 5: Take out the pipeline body after the corrosion simulation treatment, detect the corrosion degree of its inner and outer walls, and thereby obtain its corrosion resistance.

[0015] Compared with the prior art, the present invention provides an oil and gas pipeline corrosion resistance detection device, which has the following beneficial effects: 1. For this oil and gas pipeline corrosion resistance detection device, through the rotation of the guide vane, the oilfield water simulation liquid continuously circulates through the inside of the pipeline body. At the same time, with the setting of the cross-shaped card rod, the cross-shaped groove sleeve rod and the pulley group, the pipeline body rotates, so as to more accurately simulate the dynamic environment of the oil and gas pipeline in actual use, realize better corrosion detection simulation, help to obtain more accurate corrosion data, and improve the reliability of the experimental results.

[0016] 2. For this oil and gas pipeline corrosion resistance detection device, by heating the soil environment simulation liquid in the detection box and cooperating with the rotation of the pipeline body, both the inner and outer walls of the pipeline body are heated, so as to accelerate the corrosion reaction rate between the simulation liquid and the inner and outer walls of the pipeline body, reduce the time required for the whole detection process, and further improve the detection efficiency.

[0017] 3. For this oil and gas pipeline corrosion resistance detection device, through the cooperation between the push rod and the inclined push plate, the pressure in the liquid storage tank is continuously increased, so that the flow pressure of the oilfield water simulation liquid flowing through the pipeline body increases, and with the heating effect, a high-temperature and high-pressure scenario inside the pipeline body is better simulated, so that the simulation experiment can be closer to the actual working conditions, thereby providing a more accurate and reliable evaluation result and effectively improving the reliability of the detection result. Description of the Drawings

[0018] Figure 1 Schematic diagram of the overall structure of a corrosion resistance detection device for oil and gas pipelines proposed by the present invention Figure 1 ; Figure 2 Schematic diagram of the overall structure of a corrosion resistance detection device for oil and gas pipelines proposed by the present invention Figure 2 ; Figure 3 Schematic diagram of the internal structure of the detection box of a corrosion resistance detection device for oil and gas pipelines proposed by the present invention; Figure 4 Schematic diagram of the side view semi-sectional structure of a corrosion resistance detection device for oil and gas pipelines proposed by the present invention Figure 1 ; Figure 5 Schematic diagram of the enlarged structure of area A in a corrosion resistance detection device for oil and gas pipelines proposed by the present invention Figure 4 ; Figure 6 Schematic diagram of the side view semi-sectional structure of a corrosion resistance detection device for oil and gas pipelines proposed by the present invention Figure 2 ; Figure 7 Schematic diagram of the enlarged structure of area B in a corrosion resistance detection device for oil and gas pipelines proposed by the present invention Figure 6 ; Figure 8 Schematic diagram of the partial sectional structure of a corrosion resistance detection device for oil and gas pipelines proposed by the present invention; Figure 9 Schematic diagram of the enlarged structure of area C in a corrosion resistance detection device for oil and gas pipelines proposed by the present invention Figure 8 ;

[0019] In the figure: 1. Detection box; 2. Push-pull rod; 21. Clamping seat; 211. Liquid guide groove; 22. Pipeline body; 3. Liquid guide cylinder; 31. Liquid storage tank; 32. First conduit; 33. Fifth conduit; 34. Liquid extraction pump; 4. Air guide box; 41. Air guide pipe; 42. Inflation pipe; 5. Reciprocating lead screw; 51. Limit box; 52. First motor; 53. Moving plate; 6. Diversion box; 61. Driving shaft; 611. Diversion blade; 62. Second motor; 63. Second conduit; 64. Third conduit; 65. Fourth conduit; 66. Cross clamping rod; 661. Cross groove sleeve rod; 67. Pulley group; 68. Limit groove; 681. Limit rod; 7. Heater; 71. Electric heating tube; 8. Piston plate; 81. Oblique push plate; 82. Return spring; 83. Push rod; 9. Liquid suction box; 91. Liquid suction pipe; 92. Air extraction pipe; 93. Drainage pipe. Detailed implementation manners

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0022] Embodiment 1: Referring to Figures 1 - 9 , an anti-corrosion detection device for oil and gas pipelines, including a detection box 1, a heater 7 is fixedly connected to the outer wall of the detection box 1, an electric heating tube 71 is fixedly connected inside the detection box 1, the electric heating tube 71 is connected to the output end of the heater 7, both sides of the inner wall of the detection box 1 are slidably connected with push-pull rods 2, the inner ends of both sides of the push-pull rods 2 are fixedly connected with clamping seats 21, a pipeline body 22 is installed between the two clamping seats 21 on both sides, and a driving part for pushing the clamping seat 21 to fix the pipeline body 22 is provided on the detection box 1. It also includes: a liquid guide cylinder 3, the liquid guide cylinder 3 is fixedly connected to the outer wall of the detection box 1, a liquid storage tank 31 is fixedly connected to the top of the detection box 1, and the liquid storage tank 31 is connected to the liquid guide cylinder 3 through a first conduit 32. Among them, a diversion part for pushing the liquid in the liquid guide cylinder 3 into the pipeline body 22 for circulating flow is provided on the detection box 1; two air guide boxes 4 are respectively fixed on two symmetrical side walls of the detection box 1 and are distributed staggeredly left and right, the two air guide boxes 4 are connected to each other through an air guide pipe 41, the top of one of the air guide boxes 4 is connected to the top of the inner cavity of the liquid storage tank 31 through an air filling pipe 42. Among them, an air filling part for filling the gas in the air guide box 4 into the liquid storage tank 31 is provided inside the detection box 1.

[0023] Through the setting of the above structure, after the pipeline body 22 is fixed in the detection box 1, first, a soil environment simulation liquid is added to the detection box 1 for anti-corrosion detection of the outer wall of the pipeline body 22. Secondly, the oilfield water simulation liquid in the liquid storage tank 31 circulates through the pipeline body 22 to realize the anti-corrosion detection of the inner wall of the pipeline body 22, so as to synchronously realize the anti-corrosion detection of the inner and outer walls of the pipeline body 22, effectively improving the detection efficiency; and by using the setting of the diversion part and the air filling part, a more real use environment of the pipeline body 22 is further simulated, so as to provide a more accurate and reliable evaluation result, effectively improving the reliability of the detection result.

[0024] Referring to Figures 1 - 3, wherein the driving part includes a reciprocating lead screw 5. Limit boxes 51 are fixedly connected to both sides of the detection box 1. The reciprocating lead screw 5 penetrates through the detection box 1 and is rotatably connected to the two limit boxes 51. A first motor 52 is fixedly connected to the outer wall of one of the limit boxes 51. The output shaft of the first motor 52 is fixedly connected to the end of the reciprocating lead screw 5. A moving plate 53 is rotatably connected to the outer end of the push-pull rod 2. The lower end of the moving plate 53 is threadedly sleeved on the reciprocating lead screw 5, and the thread directions of the reciprocating lead screw 5 within the two limit boxes 51 are opposite.

[0025] With the above structure set, turn on the first motor 52 to drive the reciprocating lead screw 5 with opposite threads on both sides to rotate. At this time, the two moving plates 53 will move towards the center of the detection box 1, thereby pushing the clamping seat 21 towards the end of the pipeline body 22 through the push-pull rod 2, and finally clamping and fixing the pipeline body 22 between the two clamping seats 21, thus ensuring the stability during the detection of the pipeline body 22.

[0026] Refer to Figures 2 - 4 , wherein the diversion part includes a diversion box 6. The diversion box 6 is fixed on the outer wall of the detection box 1. A drive shaft 61 is rotatably connected inside the diversion box 6. A diversion blade 611 is fixedly connected to the drive shaft 61. A second motor 62 is fixedly connected to the side wall of the diversion box 6. The output shaft of the second motor 62 is fixedly connected to the end of the drive shaft 61. The diversion box 6 is connected to the liquid guide cylinder 3 through a second conduit 63. Liquid guide grooves 211 are communicated and opened inside the clamping seat 21, the push-pull rod 2, and the moving plate 53. The diversion box 6 is connected to the liquid guide grooves 211 through a third conduit 64. The liquid guide cylinder 3 is connected to the liquid guide grooves 211 on the other side through a fourth conduit 65.

[0027] With the above structure set, turn on the second motor 62 to drive the diversion blades 611 inside the diversion box 6 to rotate, thereby pushing the simulated oilfield water liquid to circulate along the path of the liquid guide cylinder 3, the second conduit 63, the diversion box 6, the third conduit 64, the pipeline body 22, the fourth conduit 65, and the liquid guide cylinder 3, thereby simulating the real liquid flow state inside the pipeline body 22, which helps to obtain more accurate corrosion data and improve the reliability of the experimental results.

[0028] Refer to Figure 1 , Figure 2 and Figure 9Among them, one end of the driving shaft 61 passes through the outside of the guide box 6 and is fixedly connected with a cross clamping rod 66, and a cross groove sleeve rod 661 is slidably sleeved on the cross clamping rod 66. The cross groove sleeve rod 661 and the push-pull rod 2 are connected through a pulley group 67 for transmission; a limiting groove 68 is provided in the cross clamping rod 66, and the limiting groove 68 horizontally passes through the outside of the pulley group 67, and a limiting rod 681 is inserted into the limiting groove 68, and the other end of the limiting rod 681 is fixed on the side wall of the guide box 6. The function of the limiting rod 681 is to prevent the cross groove sleeve rod 661 from slipping off and ensure the transmission effect of the pulley group 67.

[0029] By setting the above-mentioned structure, in coordination with the setting of the cross clamping rod 66, the cross groove sleeve rod 661 and the pulley group 67, the push-pull rod 2 is rotated. At this time, since the pipe body 22 is tightly clamped between the clamping seats 21 on both sides, when the liquid continuously flows through the inside of the pipe body 22, the pipe body 22 will also rotate synchronously, thereby more accurately simulating the dynamic environment of the oil and gas pipeline in actual use, so that the oilfield water simulation liquid can contact the inner wall of the pipe body 22 more evenly, so that the inner wall of the pipe body 22 can obtain relatively uniform test conditions, thereby achieving better corrosion detection simulation, helping to obtain more accurate corrosion data, and improving the reliability of experimental results.

[0030] Reference Figure 2 , Figure 4 and Figure 6 The top of the liquid storage tank 31 and the bottom of the liquid guiding tube 3 are connected through a fifth conduit 33, a liquid pump 34 is installed on the fifth conduit 33, the liquid pump 34 is fixed on the detection box 1, and electromagnetic valves are provided in the first conduit 32 and the fifth conduit 33.

[0031] Through the arrangement of the above structure, after the detection is completed, the solenoid valve in the fifth conduit 33 is opened, and the solenoid valve in the first conduit 32 is closed, and then the liquid pump 34 is turned on to pump back the oilfield water simulation liquid flowing out of the liquid storage tank 31, thereby realizing the recycling and reuse of the oilfield water simulation liquid, saving the cost of repeated detection and improving the energy saving effect.

[0032] Reference Figures 3 - 5 The inflation part includes two groups of piston plates 8, which are respectively slidably connected in the two groups of air guide boxes 4. The side of the piston plate 8 facing the inner cavity of the detection box 1 is fixedly connected with an oblique push plate 81, and the inclined surfaces of the two groups of oblique push plates 81 are parallel to each other. A return spring 82 is fixedly connected between the other side of the piston plate 8 and the inner wall of the air guide box 4, a push rod 83 is fixedly connected to the side wall of the clamping seat 21, and a one-way valve is arranged in the inflation tube 42.

[0033] It should be noted that the one-way valve in the inflation tube 42 can only allow the gas in the gas guide box 4 to be charged into the liquid storage tank 31 .

[0034] With the above structure set, during the rotation of the clamping seats 21 on both sides, firstly, the stirring of the soil environment simulation liquid in the detection box 1 can be realized by itself, thereby improving the uniformity of the contact between the soil environment simulation liquid and heat as well as the outer wall of the pipe body 22, and thus improving the detection accuracy; and in cooperation with the setting of the push rod 83 and the inclined push plate 81, when the clamping seats 21 on both sides rotate, the push rod 83 will intermittently squeeze the inclined push plate 81, causing the inclined push plate 81 to slide towards the side of the compression return spring 82. At this time, the gas in the air guide box 4 will be compressed, and the one-way valve in the gas filling pipe 42 will be opened, so that the compressed gas will enter the liquid storage tank 31 along the gas filling pipe 42, thereby increasing the pressure in the liquid storage tank 31, increasing the flow pressure of the oilfield water simulation liquid flowing through the pipe body 22, and in cooperation with the heating effect, better simulating the high-temperature and high-pressure scenario in the pipe body 22, enabling the simulation experiment to be closer to the actual working conditions, thus providing more accurate and reliable evaluation results and effectively improving the reliability of the detection results.

[0035] Refer to Figure 1 、 Figures 4 - 7 , wherein, a liquid suction box 9 is fixedly connected to the side wall of the detection box 1, a liquid suction pipe 91 is fixedly connected and communicated with the side wall of the detection box 1, and the other end of the liquid suction pipe 91 is communicated with the upper part of the inner cavity of the liquid suction box 9. One of the air guide boxes 4 is fixedly connected and communicated with an air extraction pipe 92 at the top, and a one-way valve is arranged in the air extraction pipe 92. A drain pipe 93 is fixedly connected to the inner wall of the detection box 1, the drain pipe 93 is communicated with the lower part of the inner cavity of the liquid suction box 9, and a one-way valve is arranged in the connecting pipe between the drain pipe 93 and the liquid suction box 9.

[0036] It should be noted that the one-way valve arranged in the connecting pipe can only make the liquid in the liquid suction box 9 flow back into the detection box 1 after entering the drain pipe 93.

[0037] With the above structure set, when the push rod 83 crosses the inclined push plate 81, under the rebounding action of the return spring 82, the inclined push plate 81 will reset and slide. At this time, it will first push the soil environment simulation liquid in the detection box 1 to move, achieving a better stirring effect; secondly, it will generate a suction force in the air guide box 4, thereby opening the one-way valve in the air extraction pipe 92, enabling the suction force in the air guide box 4 to be transmitted to the liquid suction box 9. At this time, the soil environment simulation liquid in the detection box 1 will be sucked into the liquid suction box 9 along the liquid suction pipe 91. When the suction force in the liquid suction box 9 disappears (the inclined push plate 81 is compressed again), the gravitational force of the liquid will push open the one-way valve in the pipeline connecting the drain pipe 93 and the liquid suction box 9. At this time, the soil environment simulation liquid in the liquid suction box 9 will flow back into the detection box 1 again, thereby realizing the continuous exchange of the soil environment simulation liquid between the upper and lower layers, achieving uniform heating of the soil environment simulation liquid, ensuring the accuracy of the detection results; in addition, when inhaling in the air guide box 4, the gas in the liquid suction box 9 will be supplemented into the air guide box 4, realizing the continuous application of the air pressure in the liquid storage tank 31.

[0038] Embodiment 2: Referring to Figures 1 - 9 , which is basically the same as Embodiment 1. On the basis of Embodiment 1, a method for detecting the corrosion resistance of oil and gas pipelines is proposed, and the steps are as follows: Step 1: Cut a pipeline body 22 of an appropriate length and clamp it between the two clamping seats 21 on both sides; Step 2: Add soil environment simulation liquid into the detection box 1 and heat it; Step 3: Introduce the oilfield water simulation liquid in the liquid storage tank 31 into the pipeline body 22 and make the oilfield water simulation liquid circulate; Step 4: Pressurize the oilfield water simulation liquid during liquid circulation and rotate the pipeline body 22; Step 5: Take out the pipeline body 22 after corrosive simulation treatment and detect the corrosion degree of its inner and outer walls to obtain its corrosion resistance.

[0039] Referring to Figures 1 - 9, in the present invention, during use, a corresponding length of the pipe body 22 is intercepted and placed between the two clamping seats 21. Subsequently, the first motor 52 is turned on to drive the reciprocating screw rods 5 with opposite threads on both sides to rotate. At this time, the moving plates 53 on both sides will move towards the center of the detection box 1, thereby pushing the clamping seats 21 towards the ends of the pipe body 22 through the push-pull rods 2, and finally clamping and fixing the pipe body 22 between the two clamping seats 21, thus ensuring the stability of the pipe body 22 during the detection process. Subsequently, a soil environment simulation liquid is added into the detection box 1, and the cover plate on the top of the detection box 1 is closed. At the same time, the heater 7 is turned on, so that the electric heating tube 71 heats the soil environment simulation liquid added into the detection box 1. And the solenoid valve in the first conduit 32 is opened, so that the oilfield water simulation liquid in the liquid storage tank 31 flows into the liquid guide cylinder 3. Then, the second motor 62 is turned on to drive the guide vane 611 in the guide box 6 to rotate, thereby pushing the oilfield water simulation liquid to circulate along the path of the liquid guide cylinder 3, the second conduit 63, the guide box 6, the third conduit 64, the pipe body 22, the fourth conduit 65 and the liquid guide cylinder 3, thus simulating the real liquid flow state inside the pipe body 22. And with the arrangement of the cross-shaped clamping rod 66, the cross-shaped groove sleeve rod 661 and the pulley group 67, the push-pull rod 2 rotates. At this time, since the pipe body 22 is tightly clamped between the two clamping seats 21, when the liquid continuously flows through the inside of the pipe body 22, the pipe body 22 will also rotate synchronously, thereby more accurately simulating the dynamic environment of the oil and gas pipeline during actual use, making the oilfield water simulation liquid contact the inner wall of the pipe body 22 more evenly, and enabling the inner wall of the pipe body 22 to obtain relatively uniform test conditions, thereby realizing better corrosive detection simulation, helping to obtain more accurate corrosion data, and improving the reliability of the experimental results.

[0040] When the pipe body 22 rotates, the heated soil environment simulation liquid in the detection box 1 will also evenly contact the outer wall of the pipe body 22. At the same time, the corrosion resistance detection of the inner and outer walls of the pipe body 22 is realized, effectively improving the detection efficiency. Moreover, when heating the soil environment simulation liquid, the oilfield water simulation liquid inside the pipe body 22 can be heated at the same time, thereby accelerating the corrosion reaction rate between it and the inner and outer walls of the pipe body 22 and reducing the time required for the entire detection process, thus further improving the detection efficiency.

[0041] During the rotation of the clamping seats 21 on both sides, firstly, it can stir the soil environment simulation liquid in the detection box 1 by itself, thereby improving the uniformity of the contact between the soil environment simulation liquid and heat as well as the outer wall of the pipe body 22, and thus improving the detection accuracy. And in cooperation with the arrangement of the push rod 83 and the inclined push plate 81, when the clamping seats 21 on both sides rotate, the push rod 83 will intermittently squeeze the inclined push plate 81, causing the inclined push plate 81 to slide towards the side of the compression return spring 82. At this time, the gas in the air guide box 4 will be compressed, and the one-way valve in the gas filling pipe 42 will be opened, so that the compressed gas will enter the liquid storage tank 31 along the gas filling pipe 42, thereby increasing the pressure in the liquid storage tank 31, increasing the flow pressure of the oilfield water simulation liquid flowing through the pipe body 22, and cooperating with the heating effect, better simulating the high-temperature and high-pressure scenario in the pipe body 22, enabling the simulation experiment to be closer to the actual working conditions, thus providing more accurate and reliable evaluation results and effectively improving the reliability of the detection results. When the push rod 83 passes over the inclined push plate 81, under the rebounding action of the return spring 82, the inclined push plate 81 will slide back. Firstly, it will push the soil environment simulation liquid in the detection box 1 to move, achieving a better stirring effect. Secondly, it will generate a suction force in the air guide box 4, thereby opening the one-way valve in the air extraction pipe 92, so that the suction force in the air guide box 4 is transmitted to the liquid suction box 9. At this time, the soil environment simulation liquid in the detection box 1 will be sucked into the liquid suction box 9 along the liquid suction pipe 91. When the suction force in the liquid suction box 9 disappears (the inclined push plate 81 is compressed again), the gravity of the liquid will push open the one-way valve in the pipeline connecting the drain pipe 93 and the liquid suction box 9. At this time, the soil environment simulation liquid in the liquid suction box 9 will flow back into the detection box 1 again, thereby realizing the continuous exchange of the upper and lower layers of the soil environment simulation liquid and achieving uniform heating of the soil environment simulation liquid, ensuring the accuracy of the detection results.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An oil and gas pipeline corrosion resistance detection device, including a detection box (1), characterized in that, Push-pull rods (2) are slidably connected to both sides of the inner wall of the detection box (1), the inner ends of the push-pull rods (2) on both sides are fixedly connected to the clamping seats (21), a pipe body (22) is installed between the clamping seats (21) on both sides, and a driving part is provided on the detection box (1) for pushing the clamping seat (21) to fix the pipe body (22), and further comprises: A liquid guiding tube (3), the liquid guiding tube (3) being fixedly connected to the outer wall of the detection box (1), a liquid storage box (31) being fixedly connected to the top of the detection box (1), the liquid storage box (31) being connected to the liquid guiding tube (3) via a first conduit (32), The detection box (1) is provided with a guide portion for pushing the liquid in the liquid guide cylinder (3) into the pipeline body (22) for circulation; Two groups of air guide boxes (4), the two groups of air guide boxes (4) are respectively fixed on two groups of symmetrical side walls of the detection box (1) and are staggered on the left and right. The two groups of air guide boxes (4) are connected through an air guide tube (41), and the top of one group of air guide boxes (4) is connected to the top of the inner cavity of the liquid storage box (31) through an air charging tube (42). Wherein, the detection box (1) is provided with a gas filling portion for filling the gas in the gas guide box (4) into the liquid storage box (31).

2. The oil and gas pipeline corrosion resistance detection device according to claim 1, characterized in that, The driving part comprises a reciprocating screw (5), both sides of the detection box (1) are fixedly connected to limit boxes (51), the reciprocating screw (5) passes through the detection box (1) and is rotatably connected to the limit boxes (51) on both sides, a first motor (52) is fixedly connected to the outer wall of the limit box (51) on one side, an output shaft of the first motor (52) is fixedly connected to the end of the reciprocating screw (5), the outer end of the push-pull rod (2) is rotatably connected to a moving plate (53), the lower end of the moving plate (53) is threadedly sleeved on the reciprocating screw (5), and the threads of the reciprocating screw (5) located in the limit boxes (51) on both sides have opposite directions.

3. The oil and gas pipeline corrosion resistance detection device according to claim 2, characterized in that, The flow guide portion comprises a flow guide box (6), the flow guide box (6) being fixed on the outer wall of the detection box (1), a driving shaft (61) being rotatably connected inside the flow guide box (6), a flow guide blade (611) being fixedly connected to the driving shaft (61), a second motor (62) being fixedly connected to the side wall of the flow guide box (6), an output shaft of the second motor (62) being fixedly connected to the end of the driving shaft (61), the flow guide box (6) being connected to the liquid guide cylinder (3) via a second conduit (63), a liquid guide groove (211) being connected and opened inside the clamping seat (21), the push-pull rod (2) and the movable plate (53), the flow guide box (6) being connected to the liquid guide groove (211) via a third conduit (64), and the liquid guide cylinder (3) being connected to the liquid guide groove (211) on the other side via a fourth conduit (65).

4. The oil and gas pipeline corrosion resistance detection device according to claim 3, characterized in that, One end of the drive shaft (61) passes through the outside of the deflector box (6) and is fixedly connected to a cross clamping rod (66); a cross groove sleeve rod (661) is slidably sleeved on the cross clamping rod (66); the cross groove sleeve rod (661) is transmission-connected to the push-pull rod (2) via a pulley set (67).

5. The oil and gas pipeline corrosion resistance detection device according to claim 4, characterized in that, A limiting groove (68) is formed in the cross-shaped lever (66), the limiting groove (68) horizontally penetrates to the outside of the pulley set (67), and a limiting rod (681) is inserted into the limiting groove (68), and the other end of the limiting rod (681) is fixed on the side wall of the diversion box (6).

6. The oil and gas pipeline corrosion resistance detection device according to claim 1, characterized in that, A heater (7) is fixedly connected to the outer wall of the detection box (1), an electric heating tube (71) is fixedly connected inside the detection box (1), and the electric heating tube (71) is connected to the output end of the heater (7).

7. The oil and gas pipeline corrosion resistance detection device according to claim 1, characterized in that, The top of the liquid storage tank (31) is communicated with the bottom of the liquid guide cylinder (3) through a fifth conduit (33), a liquid pumping pump (34) is installed on the fifth conduit (33), the liquid pumping pump (34) is fixed on the detection box (1), and electromagnetic valves are arranged in both the first conduit (32) and the fifth conduit (33).

8. The oil and gas pipeline corrosion resistance detection device according to claim 1, characterized in that, The inflation part includes two piston plates (8), the two piston plates (8) are respectively slidably connected in two air guide boxes (4), an inclined push plate (81) is fixedly connected to the side of the piston plate (8) facing the inner cavity of the detection box (1), and the inclined surfaces of the two inclined push plates (81) are parallel to each other. A return spring (82) is fixedly connected between the other side of the piston plate (8) and the inner wall of the air guide box (4). A push rod (83) is fixedly connected to the side wall of the clamping seat (21), and a one-way valve is arranged in the air charging pipe (42).

9. The oil and gas pipeline corrosion resistance detection device according to claim 8, characterized in that, A liquid suction box (9) is fixedly connected to the side wall of the detection box (1), a liquid suction pipe (91) is fixedly connected and communicated with the side wall of the detection box (1), the other end of the liquid suction pipe (91) is communicated with the upper part of the inner cavity of the liquid suction box (9). The top of one of the air guide boxes (4) is fixedly connected and communicated with an air extraction pipe (92), and a one-way valve is arranged in the air extraction pipe (92). A drainage pipe (93) is fixedly connected to the inner wall of the detection box (1), the drainage pipe (93) is communicated with the lower part of the inner cavity of the liquid suction box (9), and a one-way valve is arranged in the pipeline where the drainage pipe (93) is communicated with the liquid suction box (9).

10. An oil and gas pipeline corrosion resistance detection method, using an oil and gas pipeline corrosion resistance detection device according to any one of claims 1-9, characterized in that, The steps are as follows: Step 1: Cut a pipeline body (22) of a corresponding length and clamp it between the two clamping seats (21). Step 2: Add a soil environment simulation liquid into the detection box (1) and heat it. Step 3: Introduce the oilfield water simulation liquid in the liquid storage tank (31) into the pipeline body (22) and make the oilfield water simulation liquid circulate. Step 4: Pressurize the oilfield water simulation liquid during liquid circulation and rotate the pipeline body (22). Step 5: Take out the pipeline body (22) after corrosive simulation treatment, detect the corrosion degree of its inner and outer walls, and thereby obtain its corrosion resistance.

Images