An oil and gas pipeline corrosion resistance detection device

Abstract

The present invention discloses an oil and gas pipeline corrosion resistance detection device, which belongs to the field of pipeline corrosion resistance detection. An oil and gas pipeline corrosion resistance detection device includes a detection box, push-pull rods are slidably connected to both sides of the inner wall of the detection box, the inner ends of the push-pull rods on both sides are fixedly connected to a clamping seat, a pipeline body is installed between the clamping seats on both sides, and a driving part is provided on the detection box to push the clamping seat to fix the pipeline body; the present invention rotates the guide vanes to make the oilfield water simulation liquid continuously circulate through the interior of the pipeline body, and at the same time cooperates with the arrangement of the cross clamp rod, cross groove sleeve rod and pulley group to make the pipeline body rotate, thereby more accurately simulating the dynamic environment of the oil and gas pipeline in actual use, achieving better corrosion detection simulation, helping to obtain more accurate corrosion data, and improving the reliability of experimental results.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline corrosion resistance detection, and in particular 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 leads to huge economic losses, but may also cause environmental pollution and even safety accidents. Therefore, it is particularly important to conduct effective corrosion resistance testing on oil and gas pipelines.

[0003] At present, existing testing equipment has certain limitations. Traditional corrosion resistance testing is usually carried out at room temperature and pressure, which cannot accurately reflect the corrosion conditions of oil and gas pipelines under actual extreme conditions such as high pressure and high temperature. It ignores the influence of factors such as fluid flow and pressure changes on the corrosion process, resulting in deviations between experimental results and actual conditions, thereby reducing the reliability of the experimental results. Therefore, a corrosion resistance testing equipment for oil and gas pipelines is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the existing technology ignores the influence of factors such as fluid flow and pressure changes on the corrosion process, resulting in deviations between experimental results and actual conditions, thereby reducing the reliability of experimental results. A corrosion resistance detection device for oil and gas pipelines is proposed to solve the problem that the existing technology ignores the influence of factors such as fluid flow and pressure changes on the corrosion process, resulting in deviations between experimental results and actual conditions, thereby reducing the reliability of experimental results.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug.

[0007] 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, and 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, and 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 opposite in direction.

[0008] 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 in the guide box, and a guide blade is fixedly connected to the drive shaft. 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 by 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 by a third conduit, and the liquid guide cylinder and the liquid guide groove on the other side are connected by a fourth conduit.

[0009] Furthermore, one end of the drive shaft passes through the outside of the deflector box and is fixedly connected to a cross clamping rod, a cross groove sleeve rod is slidably sleeved on the cross clamping rod, and the cross groove sleeve rod is connected to the push-pull rod through a pulley set.

[0010] Furthermore, a limiting groove is provided in the cross clamping rod, the limiting groove horizontally passes through to the outside of the pulley assembly, and the limiting groove is connected to a limiting rod, and the other end of the limiting rod is fixed on the side wall of the guide box.

[0011] 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.

[0012] In order to improve the energy-saving effect, preferably, the top of the liquid storage tank and the bottom of the liquid guide 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.

[0013] 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 respectively slidably connected in the two groups of air guide boxes. 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. 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 provided in the inflation tube.

[0014] 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, and a liquid suction tube is fixed and connected to the side wall of the detection box, and the other end of the liquid suction tube is connected to the upper part of the inner cavity of the liquid suction box, one group of the air guide boxes is fixed and connected to the top of an air extraction pipe, and a one-way valve is provided in the air extraction pipe, and a drain pipe is fixedly connected to the inner wall of the detection box, the drain pipe is connected to the lower part of the inner cavity of the liquid suction box, and a one-way valve is provided in the pipe connecting the drain pipe and the liquid suction box.

[0015] A method for detecting corrosion resistance of oil and gas pipelines, comprising the following steps:

[0016] Step 1: Cut the pipe body of corresponding length and clamp it between the two clamping seats;

[0017] Step 2: Add soil environment simulation liquid into the test box and heat it;

[0018] 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;

[0019] Step 4: pressurizing the oilfield water simulation liquid in the liquid circulation flow and rotating the pipeline body;

[0020] Step 5: Take out the pipe body after the corrosion simulation treatment and test the corrosion degree of its inner and outer walls to obtain its corrosion resistance.

[0021] Compared with the prior art, the present invention provides an oil and gas pipeline corrosion resistance detection device with the following beneficial effects:

[0022] 1. This oil and gas pipeline corrosion resistance testing equipment uses the rotation of the guide vanes to allow the oilfield water simulated liquid to continuously circulate through the interior of the pipeline body. At the same time, the cross-clamp rod, cross-groove sleeve rod, and pulley assembly are configured to rotate the pipeline body, thereby more accurately simulating the dynamic environment of the oil and gas pipeline in actual use, achieving better corrosion detection simulation, helping to obtain more accurate corrosion data, and improving the reliability of experimental results.

[0023] 2. This oil and gas pipeline corrosion resistance testing equipment heats the soil environment simulation liquid in the test box and rotates the pipeline body, so that both the inner and outer walls of the pipeline body are heated. This can 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 entire testing process, and thus further improve testing efficiency.

[0024] 3. This oil and gas pipeline corrosion resistance testing equipment continuously increases the pressure in the liquid storage tank through the cooperation between the push rod and the inclined push plate, thereby increasing the pressure of the simulated oilfield water flow through the pipeline body. Combined with the heating effect, it better simulates the high temperature and high pressure scene in the pipeline body, making the simulation experiment closer to actual working conditions, thereby providing more accurate and reliable evaluation results, and effectively improving the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of an oil and gas pipeline corrosion resistance detection device proposed by the present invention. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the overall structure of an oil and gas pipeline corrosion resistance detection device proposed by the present invention. Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the internal structure of a test box for oil and gas pipeline corrosion resistance testing equipment proposed by the present invention;

[0028] Figure 4 A side view of the half-section structure of an oil and gas pipeline corrosion resistance detection device proposed by the present invention Figure 1 ;

[0029] Figure 5 The present invention proposes an oil and gas pipeline corrosion resistance detection device Figure 4 Schematic diagram of the enlarged structure of area A in the middle;

[0030] Figure 6 A side view of the half-section structure of an oil and gas pipeline corrosion resistance detection device proposed by the present invention Figure 2 ;

[0031] Figure 7 The present invention proposes an oil and gas pipeline corrosion resistance detection device Figure 6 Schematic diagram of the enlarged structure of the middle B area;

[0032] Figure 8 This is a schematic diagram of the partial cross-section structure of an oil and gas pipeline corrosion resistance detection device proposed by the present invention;

[0033] Figure 9 The present invention proposes an oil and gas pipeline corrosion resistance detection device Figure 8 Schematic diagram of the enlarged structure of the middle C area.

[0034] Figure: 1, detection box; 2, push-pull rod; 21, card seat; 211, liquid guide groove; 22, pipeline body; 3, liquid guide cylinder; 31, liquid storage tank; 32, first guide tube; 33, fifth guide tube; 34, liquid pump; 4, air guide box; 41, air guide tube; 42, inflation tube; 5, reciprocating screw; 51, limit box; 52, first motor; 53, movable plate; 6, guide box; 61, drive shaft; 611, guide vane Plate; 62, second motor; 63, second conduit; 64, third conduit; 65, fourth conduit; 66, cross clamping rod; 661, cross slot sleeve rod; 67, pulley assembly; 68, limit slot; 681, limit rod; 7, heater; 71, electric heating tube; 8, piston plate; 81, oblique push plate; 82, return spring; 83, push rod; 9, liquid aspiration box; 91, liquid aspiration tube; 92, exhaust pipe; 93, discharge pipe. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0037] Example 1:

[0038] Reference Figures 1-9, an oil and gas pipeline corrosion resistance testing equipment, including a testing box 1, the outer wall of the testing box 1 is fixedly connected to a heater 7, the testing box 1 is fixedly connected to an electric heating pipe 71, the electric heating pipe 71 is connected to the output end of the heater 7, the inner wall of the testing box 1 is slidably connected to push-pull rods 2 on both sides, the inner ends of the push-pull rods 2 on both sides are fixedly connected to a clamping seat 21, a pipeline body 22 is installed between the clamping seats 21 on both sides, and the testing box 1 is provided with a driving part that pushes the clamping seat 21 to fix the pipeline body 22, and also includes: a liquid guide tube 3, the liquid guide tube 3 is fixedly connected to the outer wall of the testing box 1, and the top of the testing box 1 The detection box 1 is fixedly connected to a liquid storage tank 31, and the liquid storage tank 31 and the liquid guide tube 3 are communicated through a first conduit 32, wherein a guide portion is provided on the detection box 1 for pushing the liquid in the liquid guide tube 3 into the pipe body 22 for circulation; two groups of air guide boxes 4, the two groups of air guide boxes 4 are respectively fixed on two symmetrical groups of side walls of the detection box 1, and are staggered on the left and right, and the two groups of air guide boxes 4 are communicated through an air guide pipe 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 tank 31 through an inflation pipe 42, wherein an inflation portion is provided in the detection box 1 for filling the gas in the air guide box 4 into the liquid storage tank 31.

[0039] Through the arrangement of the above structure, after the pipe body 22 is fixed in the detection box 1, the soil environment simulation liquid is first added to the detection box 1 to perform corrosion resistance testing on the outer wall of the pipe body 22. Secondly, the oilfield water simulation liquid in the liquid storage tank 31 is circulated through the pipe body 22 to realize corrosion resistance testing on the inner wall of the pipe body 22. In this way, corrosion resistance testing of the inner and outer walls of the pipe body 22 is realized simultaneously, effectively improving the detection efficiency. In addition, the arrangement of the guide part and the inflation part is utilized to further simulate a more realistic use environment of the pipe body 22, thereby providing more accurate and reliable evaluation results, effectively improving the reliability of the detection results.

[0040] Reference Figure 1-Figure 3 , wherein the driving part includes a reciprocating screw 5, and both sides of the detection box 1 are fixedly connected to the 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, and a first motor 52 is fixedly connected to the outer wall of the limit box 51 on one side, and the output shaft of the first motor 52 is fixedly connected to the end of the reciprocating screw 5, and the outer end of the push-pull rod 2 is rotatably connected to the movable plate 53, and the lower end of the movable plate 53 is threadedly sleeved on the reciprocating screw 5, and the thread directions of the reciprocating screw 5 in the limit boxes 51 on both sides are opposite.

[0041] Through the setting of the above structure, 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 movable plates 53 on both sides will move toward the center of the detection box 1, thereby pushing the clamping seat 21 to move toward the end of the pipe body 22 through the push-pull rod 2, and finally clamping the pipe body 22 between the clamping seats 21 on both sides, thereby ensuring the stability of the pipe body 22 during the detection process.

[0042] Reference Figure 2-Figure 4 , wherein the guide part includes a guide box 6, the guide box 6 is fixed on the outer wall of the detection box 1, and a drive shaft 61 is rotatably connected in the guide box 6, and a guide blade 611 is fixedly connected to the drive shaft 61. A second motor 62 is fixedly connected to the side wall of the guide box 6, and the output shaft of the second motor 62 is fixedly connected to the end of the drive shaft 61. The guide box 6 is connected to the liquid guide cylinder 3 through a second conduit 63, and a liquid guide groove 211 is connected in the clamping seat 21, the push-pull rod 2 and the movable plate 53. The guide box 6 and the liquid guide groove 211 are connected through a third conduit 64, and the liquid guide cylinder 3 and the liquid guide groove 211 on the other side are connected through a fourth conduit 65.

[0043] Through the arrangement of the above structure, the second motor 62 is turned on to drive the guide blades 611 in the guide box 6 to rotate, thereby promoting the oilfield water simulation liquid to circulate along the path of the liquid guide tube 3, the second conduit 63, the guide box 6, the third conduit 64, the pipeline body 22, the fourth conduit 65 and the liquid guide tube 3, thereby simulating the actual liquid flow state in the pipeline body 22, which helps to obtain more accurate corrosion data and improve the reliability of the experimental results.

[0044] Reference Figure 1 、 Figure 2 and Figure 9 , among which, one end of the driving shaft 61 passes through the outside of the guide box 6 and is fixedly connected to a cross-clamping rod 66, and a cross-groove sleeve rod 661 is slidably sleeved on the cross-clamping rod 66, and the cross-groove sleeve rod 661 and the push-pull rod 2 are connected through a pulley group 67; a limiting groove 68 is provided in the cross-clamping rod 66, and the limiting groove 68 passes horizontally to the outside of the pulley group 67, and the limiting groove 68 is inserted with a limiting rod 681, and the other end of the limiting rod 681 is fixed on the side wall of the guide box 6, and the function of the limiting rod 681 is to prevent the cross-groove sleeve rod 661 from slipping and ensure the transmission effect of the pulley group 67.

[0045] Through the setting of the above-mentioned structure, in conjunction 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 contacts the inner wall of the pipe body 22 more evenly, so that the inner wall of the pipe body 22 obtains relatively uniform test conditions, thereby achieving better corrosion detection simulation, helping to obtain more accurate corrosion data, and improving the reliability of experimental results.

[0046] Reference Figure 2 、 Figure 4 and Figure 6 The top of the liquid storage tank 31 and the bottom of the liquid guide 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.

[0047] 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.

[0048] Reference Figure 3-Figure 5 , wherein the inflation part includes two groups of piston plates 8, which are respectively slidably connected in the two groups of air guide boxes 4, and 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 provided in the inflation tube 42.

[0049] It should be noted that the one-way valve in the inflation tube 42 can only allow the gas in the air guide box 4 to be charged into the liquid storage tank 31 .

[0050] Through the arrangement of the above structure, during the rotation of the clamping seats 21 on both sides, first, they themselves can realize stirring of the soil environment simulation liquid in the detection box 1, thereby improving the uniformity of the contact between the soil environment simulation liquid and the heat and the outer wall of the pipe body 22, thereby improving the detection accuracy; and in conjunction with the arrangement of the push rod 83 and the oblique push plate 81, when the clamping seats 21 on both sides rotate, the push rod 83 will intermittently squeeze the oblique push plate 81, causing the oblique push plate 81 to slide toward 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 inflation pipe 42 will be opened, so that the compressed gas enters the liquid storage tank 31 along the inflation pipe 42, thereby increasing the pressure in the liquid storage tank 31, so that the pressure of the oilfield water simulation liquid flow flowing through the pipe body 22 is increased, and in conjunction with the heating effect, the high temperature and high pressure scene in the pipe body 22 is better simulated, so that the simulation experiment can be closer to the actual working conditions, thereby providing more accurate and reliable evaluation results, and effectively improving the reliability of the detection results.

[0051] Reference Figure 1 、 Figure 4-Figure 7 , wherein, a liquid suction box 9 is fixedly connected to the side wall of the detection box 1, and a liquid suction tube 91 is fixed and connected to the side wall of the detection box 1, and the other end of the liquid suction tube 91 is connected to the upper part of the inner cavity of the liquid suction box 9, one group of air guide boxes 4 are fixed on the top and connected to an exhaust pipe 92, and a one-way valve is provided in the exhaust pipe 92, and a drain pipe 93 is fixedly connected to the inner wall of the detection box 1, the drain pipe 93 is connected to the lower part of the inner cavity of the liquid suction box 9, and a one-way valve is provided in the pipe connecting the drain pipe 93 and the liquid suction box 9.

[0052] It should be noted that the one-way valve provided in the communicating pipe can only allow the liquid in the liquid aspiration box 9 to flow into the discharge pipe 93 and then flow back into the detection box 1 .

[0053] By the arrangement of the above structure, when the push rod 83 passes over the oblique push plate 81, under the rebound action of the reset spring 82, the oblique 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, to achieve a better stirring effect; secondly, it will generate suction in the air guide box 4, thereby opening the one-way valve in the air extraction pipe 92, so that the suction 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 disappears (the oblique push plate 81 is compressed again), the gravity of the liquid will push open the one-way valve in the pipe connecting the discharge pipe 93 and the liquid aspiration box 9. At this time, the soil environment simulation liquid in the liquid aspiration box 9 will flow back into the detection box 1, thereby realizing continuous exchange of the soil environment simulation liquid in the upper and lower layers, achieving uniform heating of the soil environment simulation liquid, and ensuring the accuracy of the detection results; in addition, when air is inhaled in the air guide box 4, the gas in the liquid aspiration box 9 will be replenished into the air guide box 4, realizing the continuous application of air pressure in the liquid storage tank 31.

[0054] Example 2:

[0055] Reference Figures 1-9 , which is basically the same as Example 1. On the basis of Example 1, a method for detecting the corrosion resistance of oil and gas pipelines is proposed, and the steps are as follows:

[0056] Step 1: Cut the pipe body 22 of corresponding length and clamp it between the two side clamping seats 21;

[0057] Step 2: Add soil environment simulation liquid into the detection box 1 and heat it;

[0058] Step 3: Introduce the simulated oilfield water in the liquid storage tank 31 into the pipeline body 22 and allow the simulated oilfield water to circulate;

[0059] Step 4: pressurizing the oilfield water simulation liquid in the liquid circulation flow and rotating the pipe body 22;

[0060] Step 5: Take out the pipe body 22 after the corrosion simulation treatment and test the corrosion degree of the inner and outer walls thereof to obtain its corrosion resistance.

[0061] Reference Figures 1-9In the present invention, when in use, the pipe body 22 of the corresponding length is cut off and placed between the clamping seats 21 on both sides, and then 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 movable plates 53 on both sides will move toward the center of the detection box 1, thereby pushing the clamping seat 21 to move toward the end of the pipe body 22 through the push-pull rod 2, and finally clamping the pipe body 22 between the clamping seats 21 on both sides, thereby ensuring the stability of the pipe body 22 during the detection process; then, the soil environment simulation liquid is added to the detection box 1, and the cover on the top of the detection box 1 is closed, and the heater 7 is turned on at the same time, so that the electric heating tube 71 heats the soil environment simulation liquid added to 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 tube 3, and then the second motor 62 is turned on to drive the guide blades 61 in the guide box 6. 1 rotates, thereby pushing the oilfield water simulation liquid to circulate along the path of the liquid guide cylinder 3, the second conduit 63, the flow guide box 6, the third conduit 64, the pipeline body 22, the fourth conduit 65 and the liquid guide cylinder 3, thereby simulating the actual liquid flow state in the pipeline body 22; and in conjunction with the arrangement of the cross clamping rod 66, the cross groove sleeve rod 661 and the pulley assembly 67, the push-pull rod 2 rotates. At this time, since the pipeline body 22 is tightly clamped between the clamping seats 21 on both sides, when the liquid continuously flows through the interior of the pipeline body 22, the pipeline 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 contacts the inner wall of the pipeline body 22 more evenly, so that the inner wall of the pipeline body 22 obtains relatively uniform test conditions, thereby achieving better corrosion detection simulation, helping to obtain more accurate corrosion data, and improving the reliability of the experimental results.

[0062] 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, and at the same time realize the corrosion resistance detection of the inner and outer walls of the pipe body 22, thereby effectively improving the detection efficiency; and when the soil environment simulation liquid is heated, the oilfield water simulation liquid inside the pipe body 22 can also be heated at the same time, thereby accelerating its corrosion reaction speed with the inner and outer walls of the pipe body 22, reducing the time required for the entire detection process, thereby further improving the detection efficiency.

[0063] During the rotation of the clamping seats 21 on both sides, first, they themselves can stir the soil environment simulation liquid in the detection box 1, thereby improving the uniformity of the contact between the soil environment simulation liquid and the heat and the outer wall of the pipe body 22, thereby improving the detection accuracy; and in conjunction with the arrangement of the push rod 83 and the oblique push plate 81, when the clamping seats 21 on both sides rotate, the push rod 83 will intermittently squeeze the oblique push plate 81, causing the oblique push plate 81 to slide toward 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 inflation pipe 42 will be opened, so that the compressed gas will enter the liquid storage tank 31 along the inflation pipe 42, thereby increasing the pressure in the liquid storage tank 31, so that the pressure of the oilfield water simulation liquid flow flowing through the pipe body 22 is increased, and in conjunction with the heating effect, the high temperature and high pressure scene in the pipe body 22 is better simulated, so that the simulation experiment can be closer to the actual working conditions, thereby providing more accurate and reliable evaluation results, and effectively improving the reliability of the detection results;

[0064] When the push rod 83 passes over the oblique push plate 81, under the rebound action of the reset spring 82, the oblique 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 suction in the air guide box 4, thereby opening the one-way valve in the air extraction pipe 92, so that the suction 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 in the liquid suction box 9 disappears (the oblique push plate 81 is compressed again), the gravity of the liquid will push open the one-way valve in the pipe connecting the discharge 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, thereby realizing continuous exchange of the soil environment simulation liquid in the upper and lower layers, realizing uniform heating of the soil environment simulation liquid, and ensuring the accuracy of the test results.

[0065] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An oil and gas pipeline corrosion resistance testing device, comprising a testing box (1), characterized in that: Both sides of the inner wall of the detection box (1) are slidably connected to push-pull rods (2), the inner ends of the push-pull rods (2) on both sides are fixedly connected to 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 includes: A liquid guide tube (3) is fixedly connected to the outer wall of the detection box (1), a liquid storage box (31) is fixedly connected to the top of the detection box (1), and the liquid storage box (31) and the liquid guide tube (3) are connected 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 pipe body (22) for circulation; Two groups of air guide boxes (4), the two groups of air guide boxes (4) are respectively fixed on two symmetrical side walls of the detection box (1) and staggered on the left and right sides. The two groups of air guide boxes (4) are connected through air guide tubes (41). 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 filling tube (42). Wherein, the detection box (1) is provided with an air filling portion for filling the gas in the air guide box (4) into the liquid storage box (31); The inflation portion comprises two groups of piston plates (8), the two groups of piston plates (8) are slidably connected in the two groups of air guide boxes (4), the piston plates (8) are fixedly connected to an oblique push plate (81) on one side facing the inner cavity of the detection box (1), and the oblique 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 provided in the inflation tube (42); A liquid suction box (9) is fixedly connected to the side wall of the detection box (1), and a liquid suction tube (91) is fixedly connected to and communicated with the side wall of the detection box (1), and the other end of the liquid suction tube (91) is communicated with the upper part of the inner cavity of the liquid suction box (9). One group of the air guide boxes (4) are fixedly connected to the top and communicated with an air extraction tube (92), and a one-way valve is provided in the air extraction tube (92). A discharge tube (93) is fixedly connected to the inner wall of the detection box (1), and the discharge tube (93) is communicated with the lower part of the inner cavity of the liquid suction box (9), and a one-way valve is provided in the pipe connecting the discharge tube (93) and the liquid suction box (9).

2. The oil and gas pipeline corrosion resistance testing equipment according to claim 1, characterized in that: The driving part includes a reciprocating screw (5), and both sides of the detection box (1) are fixedly connected to the 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, and the 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 movable plate (53), and the lower end of the movable 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 testing equipment according to claim 2, characterized in that: The guide portion includes a guide box (6), the guide box (6) is fixed on the outer wall of the detection box (1), a driving shaft (61) is rotatably connected in the guide box (6), a guide blade (611) is fixedly connected to the driving shaft (61), a second motor (62) is fixedly connected to the side wall of the guide box (6), an output shaft of the second motor (62) is fixedly connected to the end of the driving shaft (61), the guide box (6) and the liquid guide cylinder (3) are connected through a second conduit (63), a liquid guide groove (211) is connected and opened in the clamping seat (21), the push-pull rod (2) and the movable plate (53), the guide box (6) and the liquid guide groove (211) are connected through a third conduit (64), and the liquid guide cylinder (3) and the liquid guide groove (211) on the other side are connected through a fourth conduit (65).

4. The oil and gas pipeline corrosion resistance testing equipment 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 slot sleeve rod (661) is slidably sleeved on the cross clamping rod (66). The cross slot sleeve rod (661) is connected to the push-pull rod (2) through a pulley group (67).

5. The oil and gas pipeline corrosion resistance testing equipment according to claim 4, characterized in that: A limiting groove (68) is provided in the cross clamping rod (66), the limiting groove (68) horizontally passes through the outside of the pulley assembly (67), and the limiting groove (68) is plugged into a limiting rod (681), the other end of the limiting rod (681) being fixed to the side wall of the guide box (6).

6. The oil and gas pipeline corrosion resistance testing equipment according to claim 1, characterized in that: A heater (7) is fixedly connected to the outer wall of the detection box (1), and 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).

7. The oil and gas pipeline corrosion resistance testing equipment according to claim 1, characterized in that: The top of the liquid storage box (31) and the bottom of the liquid guide tube (3) are connected via 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). Solenoid valves are provided in both the first conduit (32) and the fifth conduit (33).

8. A method for detecting corrosion resistance of oil and gas pipelines, using an oil and gas pipeline corrosion resistance detection device according to any one of claims 1 to 7, characterized in that: Here are the steps: Step 1: Cut the pipe body (22) of corresponding length and clamp it between the two side clamping seats (21); Step 2: Add soil environment simulation liquid into the detection box (1) and heat it; Step 3: introducing the oilfield water simulation liquid in the liquid storage tank (31) into the pipeline body (22), and allowing the oilfield water simulation liquid to circulate; Step 4: pressurizing the oilfield water simulation liquid in the liquid circulation flow and rotating the pipe body (22); Step 5: Take out the pipe body (22) after the corrosion simulation treatment and test the corrosion degree of the inner and outer walls thereof to obtain its corrosion resistance.

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