Compressive strength detecting and cleaning method for long-distance oil pipe

Abstract

The compressive strength detection and cleaning method comprises the following steps that one end of the oil pipe is subjected to high-pressure sealing, the other end of the oil pipe is connected with a hydraulic input and detection all-in-one machine, the hydraulic input and detection all-in-one machine begins to inject water, and the hydraulic pressure not smaller than 120 MPa is maintained for 48 hours or above; releasing high-pressure sealing, and keeping a water injection state; detecting the cleaning quality of the oil pipe; a hydraulic input and detection all-in-one machine is replaced with a double-channel drying pump; continuously inputting nitrogen, and intermittently inputting a plurality of dehumidification sponges; detecting the gas outlet humidity at one end of the oil pipe; and after the last dehumidification sponge is discharged out of the oil pipe, nitrogen input is stopped, and detection and cleaning operation of the oil pipe is completed. According to the compressive strength detecting and cleaning method for the long-distance oil pipe, compressive strength detecting and cleaning can be conducted on the oil pipe with the length larger than 10 km.

Description

Technical Field

[0001] The invention relates to the field of oil pipes, in particular to a method for detecting and cleaning the compressive strength of long-distance oil pipes. Background Art

[0002] With the development of marine resources, the development areas of marine resources are getting farther and farther. Correspondingly, the requirements for oil and gas transportation in offshore areas are getting higher and higher. In particular, there is a problem of pressure drop in the long-distance transportation of oil and gas. That is, in the long-distance oil and gas transportation process, the longer the distance, the greater the required extraction pressure. Therefore, it is necessary to ensure the compressive strength of the oil pipe used to transport oil and gas to ensure the transportation stability and safety of the oil pipe. At the same time, the oil pipe needs to be cleaned to reduce impurities in the oil pipe during the oil and gas transportation process to ensure high-quality operation of the oil and gas transportation by the oil pipe.

[0003] Therefore, before the oil pipe is used, the compressive strength of the oil pipe needs to be tested and cleaned. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for detecting and cleaning the compressive strength of a long-distance oil pipeline, which can detect and clean the compressive strength of an oil pipeline with a length of more than 10 km.

[0005] The technical solution adopted by the present invention to solve the above problem is: a method for detecting and cleaning the compressive strength of a long-distance oil pipe, comprising the following steps:

[0006] S1: Perform high pressure sealing at one end of the oil pipe and connect the hydraulic input testing machine at the other end of the oil pipe;

[0007] S2: The hydraulic input detection integrated machine starts to inject water, fills the oil pipe, and maintains a hydraulic pressure of not less than 120MPa for more than 48 hours;

[0008] S3: After confirming the pressure bearing capacity of the oil pipe, the high pressure seal at one end of the oil pipe is released, and the hydraulic input detection integrated machine remains in the water injection state;

[0009] S4: intermittently detect the particle size of the water outlet at one end of the oil pipe to detect the cleaning quality of the oil pipe;

[0010] S5: After no particles are discharged from one end of the oil pipe, replace the hydraulic input detection integrated machine with a dual-channel nitrogen pump;

[0011] S6: A dual-channel nitrogen pump continuously inputs nitrogen into the oil pipe and intermittently inputs several dehumidification sponges. The nitrogen pushes the dehumidification sponges to move in the oil pipe until they are discharged from one end of the oil pipe.

[0012] S7: Move one end of the oil pipe to a dry environment and detect the humidity of the air outlet at one end of the oil pipe;

[0013] S8: When the humidity of the oil pipe outlet gas approaches zero and the dehumidification sponges are all in a dry state, keep inputting nitrogen. When the last piece of dehumidification sponge is discharged from the oil pipe, stop inputting nitrogen to complete the inspection and cleaning of the oil pipe.

[0014] Compared with the prior art, the advantages of the present invention are as follows: in steps S1-S2, the oil pipe is sealed to ensure the durability and stability of the compressive strength, thereby ensuring the detection stability of the entire section of the oil pipe, and the hydraulic pressure of 120MPa is the maximum pressure that a 10km oil pipe can withstand during oil delivery under normal conditions. Although the pressure at the far end of the oil pipe decreases due to the pressure drop, it is the largest at the proximal end of the oil pipe. It is necessary to ensure the detection effect of 10km, so it is necessary to perform the detection according to a detection standard that is not less than the maximum pressure. The 48-hour detection time is to detect the long-term compressive stability of the oil pipe. If oil pressure fluctuations or oil pipe leakage occur during the process, it can be directly Then it is determined that the quality of the oil pipe does not meet the standards; at the same time, during the long-term immersion process of the inner wall of the oil pipe, welding impurities and dust impurities on the inner wall of the oil pipe are easily separated from the inner wall of the oil pipe, and then when the inner wall of the oil pipe is cleaned through steps S3 and S4, the cleaning quality of the inner wall of the oil pipe can be enhanced until the water out of the oil pipe is free of particles; then the oil pipe is dried through steps S5-S8 to avoid the water in the oil pipe affecting the smoothness of oil and gas transportation and causing the problem of deterioration of oil and gas quality during the subsequent oil and gas transportation process. The dehumidification sponge can ensure the stability of water absorption, thereby greatly increasing the effectiveness of the drying operation, and one end of the oil pipe is moved to a dry environment to ensure the accuracy of humidity detection and avoid being affected by the environment.

[0015] As an improvement of the present invention, the dual-channel nitrogen pump includes a connecting pipe, a nitrogen pipe and a sponge pipe. The diameters of the connecting pipe, the nitrogen pipe and the sponge pipe are the same as the diameters of the oil pipe. The connecting pipe is connected to the other end of the oil pipe. The nitrogen pipe and the sponge pipe are both arranged at the end of the connecting pipe away from the oil pipe. The nitrogen pipe is used to input nitrogen into the oil pipe through the connecting pipe, and the sponge pipe is used to input the dehumidification sponge into the oil pipe through the connecting pipe. Through the improvement, stable input of nitrogen and dehumidification sponge into the oil pipe is achieved, and there is no need to reciprocately install and disassemble the nitrogen input equipment due to intermittent input of the dehumidification sponge. In addition, it can be avoided that air enters the oil pipe during the drying process, causing water molecules in the air to enter the oil pipe synchronously, thereby affecting the drying effectiveness of the oil pipe.

[0016] As an improvement of the present invention, the dehumidification sponge includes a polyurethane column as a main body and a propulsion resin sheet arranged at one end of the main body. The dehumidification sponge is cylindrical, and the diameter of the dehumidification sponge is equal to the inner diameter of the oil pipe. Through the improvement, the polyurethane column is used to absorb water, thereby achieving the purpose of dehumidifying the inner wall of the oil pipe, and the propulsion resin sheet is used to ensure that the dehumidification sponge moves in the oil pipe under the action of nitrogen pressure. The design that the diameter of the dehumidification sponge is equal to the inner diameter of the oil pipe can ensure sufficient contact between the polyurethane column and the inner wall of the oil pipe, ensure the high efficiency of water absorption, and at the same time ensure the close fit between the propulsion resin sheet and the inner wall of the oil pipe, thereby ensuring the stability of the action of the nitrogen pressure, reducing the flow of nitrogen from the gap between the propulsion resin sheet and the inner wall of the oil pipe, and ensuring the high efficiency of the movement of the dehumidification sponge driven by nitrogen.

[0017] As an improvement of the present invention, a resin coating is provided on the surface of the polyurethane column. Through the improvement, the integrity of the polyurethane column is ensured without affecting the water absorption of the polyurethane column, thereby preventing the dehumidification sponge from breaking during the movement in the oil pipe. At the same time, the resin coating can also reduce the friction coefficient between the polyurethane column and the inner wall of the oil pipe, thereby allowing the polyurethane column to move more smoothly in the oil pipe.

[0018] As an improvement of the present invention, a spring is provided on the axis of the polyurethane column, and the two ends of the spring are respectively fixedly connected to the two ends of the polyurethane column, and a group of electromagnetic ring assemblies for stretching the spring are provided at intervals on the oil pipe, and the electromagnetic ring assembly includes a first electromagnetic ring and a second electromagnetic ring, and the spacing between the first electromagnetic ring and the second electromagnetic ring is greater than the length of the dehumidification sponge, and the electromagnetic ring assembly is detachably wrapped around the outer layer of the oil pipe. During the movement of the dehumidification sponge, when the dehumidification sponge is upstream of the first electromagnetic ring and the second electromagnetic ring, the spring is accelerated by the common electromagnetic force of the first electromagnetic ring and the second electromagnetic ring, and when the dehumidification sponge moves to the middle of the first electromagnetic ring and the second electromagnetic ring, the two ends of the spring are respectively stretched by the electromagnetic force of the first electromagnetic ring and the second electromagnetic ring, and when the dehumidification sponge is in the first electromagnetic ring When the spring is downstream of the second electromagnetic ring, the spring is decelerated by the common electromagnetic force of the first electromagnetic ring and the second electromagnetic ring. Through the improvement, in the process of nitrogen pushing the dehumidification sponge to move, as the distance increases, the pressure drop faced by the pushing air pressure formed by the nitrogen will also increase, so that the air pressure at a long distance is easy to be difficult to overcome the friction between the dehumidification sponge and the oil pipe, and then the dehumidification sponge cannot be discharged from one end of the oil pipe. At the same time, because the pressure reduction amplitude of the pressure drop is attenuated according to the initial pressure, when the oil pipe exceeds a certain distance, the initial nitrogen delivery pressure is increased, which has a poor effect on improving the long-distance nitrogen pushing ability. The design of the spring and the electromagnetic ring assembly can reduce the impact of the nitrogen pressure drop, so that it is easier to achieve the purpose of the nitrogen pressure pushing the dehumidification sponge through the oil pipe;

[0019] First, when the dehumidification sponge is upstream of the electromagnetic ring assembly, the spring and the polyurethane column will be compressed under the action of the nitrogen pressure at the front and rear ends and the friction between the dehumidification sponge and the oil pipe, thereby forming elastic potential energy under the condition of small upstream pressure drop. When the dehumidification sponge is close to the upstream of the electromagnetic ring assembly and close to the electromagnetic ring assembly, the dehumidification sponge will be accelerated to approach the electromagnetic ring assembly under the action of the magnetic force of the electromagnetic ring assembly. At this time, the spring and the polyurethane column will release part of the potential energy. At the same time, due to the acceleration of the dehumidification sponge and the release of part of the potential energy, the air pressure at the front end of the dehumidification sponge will increase, which will help to push the previous dehumidification sponge forward.

[0020] Then, when the dehumidification sponge is between the first electromagnetic ring and the second electromagnetic ring, the first electromagnetic ring and the second electromagnetic ring simultaneously attract the spring, thereby causing most of the spring potential energy to be released or fully released, that is, the elastic potential energy under the state of small upstream pressure drop is moved to the downstream area with slightly larger pressure drop for release, thereby forming a pressure drop supplement. By analogy, after passing through multiple electromagnetic ring components, the amplitude of the pressure drop can be effectively slowed down, so that the nitrogen pressure can be better pushed on the dehumidification sponge. Compared with the design without electromagnetic ring components, the elastic potential energy under the state of small upstream pressure drop will be slowly released as the nitrogen pressure gradually decreases, and its supplement to the pressure drop is very small. Even if there is no spring design, there is almost no effect of pressure drop supplement. At the same time, the full expansion of the dehumidification sponge can also reduce the space at the forward end of the dehumidification sponge to increase the pressure between the previous dehumidification sponge, but the effect is very small, and it plays a role that is better than nothing. The real role of the full expansion of the dehumidification sponge is The water absorption space of the polyurethane column is restored. Under the compression state, the water absorption space of the polyurethane column decreases, and the water in the oil pipe may exceed the maximum water absorption capacity of the polyurethane column. In addition, the diffusion effect of water in the polyurethane column is poor under the compression state, and some water will accumulate at the front end of the dehumidification sponge, making it difficult to achieve an efficient dehumidification effect. After the polyurethane column is unfolded, the water absorption capacity of the polyurethane column is restored, and the water is more likely to diffuse into the interior of the polyurethane water, so that the polyurethane column can absorb more water and reduce the water accumulation at the front end of the dehumidification sponge. More accumulated water can only be eliminated by subsequent dehumidification sponges. In actual applications, the first dehumidification sponge has the highest dehumidification rate, and even a large amount of accumulated water can be pushed out of the front end. However, due to the limitation of water volume, after the dehumidification sponge is saturated with water, there will always be water involved in the contact surface between the dehumidification sponge and the inner wall of the oil pipe, resulting in that when the inner wall of the oil pipe is dehumidified by the dehumidification sponge after being saturated with water, the dehumidification problem cannot be perfectly solved, and there will always be water stains remaining on the inner wall of the oil pipe.

[0021] Finally, when the dehumidification sponge is downstream of the electromagnetic ring assembly, the magnetic force of the electromagnetic ring assembly will attract the dehumidification sponge. At this time, the dehumidification sponge will be compressed under the action of the nitrogen pressure at the front end, the nitrogen pressure at the rear end, the friction between the dehumidification sponge and the oil pipe, and the electromagnetic force of the electromagnetic ring assembly, forming elastic potential energy in a state of small pressure drop in the new area, so as to supplement the pressure drop in the area where the next electromagnetic ring assembly is located.

[0022] From an overall perspective, the effects of the dehumidification sponge on the dehumidification sponge in the upstream and downstream areas of the electromagnetic ring assembly are balanced and offset. If the dehumidification sponge has a process of absorbing water between the first and second electromagnetic rings, its compressed size downstream of the electromagnetic ring assembly will decrease because it cannot fully discharge the water in the polyurethane column. This is easy to happen during the dehumidification process of the first few dehumidification sponges, but at this time the elastic coefficient of the polyurethane column will also increase significantly. Although the compressed size is reduced, it will not affect the effect of pressure drop supplementation. At the same time, because the polyurethane column has absorbed enough water, the friction between it and the oil pipe will be greatly reduced, which is more conducive to the rapid movement of the polyurethane column in the oil pipe.

[0023] As an improvement of the present invention, the oil pipe is wrapped around the vertical plate in a manner of expanding the diameter layer by layer during detection, and multiple groups of the electromagnetic ring assemblies are respectively arranged on a circle of oil pipes that are against the two ends of the vertical plate, and the electromagnetic ring assemblies on the same end are arranged in partitions. Through the improvement, in the storage of the oil pipe, it is mainly divided into horizontal spiral stacking storage and layer-by-layer expansion storage around the vertical plate. Among them, the horizontal spiral stacking storage method has poor variability in the utilization of the electromagnetic ring assembly during the detection process, and the effects of the wet sponge on the dehumidification sponge in the two areas upstream and downstream of the electromagnetic ring assembly are always balanced and offset. Therefore, the storage method of expanding the diameter layer by layer around the vertical plate is adopted, which is convenient for further improving the pressure drop reinforcement effect of the electromagnetic ring assembly.

[0024] As an improvement of the present invention, the second electromagnetic ring is arranged directly above a circle of oil pipes, and the first electromagnetic ring is arranged upstream of the second electromagnetic ring. Through the improvement, when the dehumidification sponge moves toward the electromagnetic ring assembly, the first electromagnetic ring and the second electromagnetic ring are both arranged above the dehumidification sponge, which can assist the dehumidification sponge to overcome gravity and move upward. Then, when the dehumidification sponge moves away from the electromagnetic ring assembly, the dehumidification sponge is horizontally located between the first electromagnetic ring and the second electromagnetic ring, thereby reducing the electromagnetic force of the electromagnetic ring assembly on the dehumidification sponge, so as to reduce the deceleration amplitude of the electromagnetic ring assembly on the dehumidification sponge. At the same time, because the dehumidification sponge starts to move downward, it can use its own gravity to accelerate the escape from the influence of the electromagnetic ring assembly on itself, thereby achieving the effect of speeding up as a whole, and there will be no situation in which the effects of the dehumidification sponge on the dehumidification sponge in the two areas upstream and downstream of the electromagnetic ring assembly balance and offset each other.

[0025] As an improvement of the present invention, the magnetic poles formed by the first electromagnetic ring and the second electromagnetic ring are in opposite directions. Through the improvement, because the spring itself is not magnetic, the attraction effect of the first electromagnetic ring and the second electromagnetic ring on the spring is consistent, both are attraction and no repulsion. Because the spring and the oil pipe are not in contact, there is no magnetization phenomenon on the spring. Whether the magnetic poles formed by the first electromagnetic ring and the second electromagnetic ring are in the same direction or opposite, as long as the spring can be fully expanded between the first electromagnetic ring and the second electromagnetic ring, the pressure drop reinforcement effect can be achieved. However, because the nitrogen pressure must always be kept much greater than the magnetic effect of the electromagnetic ring assembly, it can be ensured that the dehumidification sponge will not be adsorbed on the electromagnetic ring assembly, especially at a long distance. In the detached area, when the nitrogen pressure has been greatly reduced due to the pressure drop effect, if the magnetic poles of the first electromagnetic ring and the second electromagnetic ring are in the same direction, the electromagnetic force formed by the electromagnetic ring assembly is very easy to approach the nitrogen pressure, causing the dehumidification sponge to be adsorbed on the electromagnetic ring assembly, so that the magnetic poles of the first electromagnetic ring and the second electromagnetic ring are set in opposite directions, ensuring that the stretching effect of the first electromagnetic ring and the second electromagnetic ring on the spring remains unchanged, but the electromagnetic force on the outside of the electromagnetic ring assembly is greatly reduced due to the mutual cancellation of the magnetic poles formed by the first electromagnetic ring and the second electromagnetic ring, leaving only a weak electromagnetic force formed by the deviation of the magnetic flux density formed by the distance, so as to better ensure that the pushing effect of the nitrogen pressure is much greater than the attraction of the electromagnetic ring assembly.

[0026] As an improvement of the present invention, a synchronous resin sheet is provided at one end of the polyurethane column away from the propulsion resin sheet. The synchronous resin sheet is arranged on the axis of the polyurethane column. The diameter of the synchronous resin sheet is smaller than the diameter of the polyurethane column. One end of the spring is fixedly connected to the synchronous resin sheet, and the other end of the spring is fixedly connected to the propulsion resin sheet. Through the improvement, the synchronization of compression and expansion of the spring with the compression and expansion of the polyurethane column is guaranteed, and the polyurethane column is driven to deform by the spring. At the same time, the diameter of the synchronous resin sheet is smaller than the diameter of the polyurethane column, which can ensure the contact between the polyurethane column and the oil pipe, thereby ensuring the water absorption effect of the polyurethane column in the oil pipe.

[0027] As an improvement of the present invention, a shaping resin sheet is provided in the middle section of the polyurethane column, and the shaping resin sheet is hollowed out. The diameter of the shaping resin sheet is the same as the inner diameter of the oil pipe, and the shaping resin sheet is fixedly connected to the middle section of the spring. Through the improvement, the dehumidification sponge moves along an arc during the movement in the oil pipe, and the inner wall arc surface of the oil pipe will not contact the spring, so that the polyurethane column is prone to bending. Although the spring will also bend in an arc, the bending arc is smaller than the bending arc of the polyurethane column, and then the center of gravity of the polyurethane column deviates from the axis of the oil pipe. During the pushing process under nitrogen pressure, the force is uneven, and it is easy to deform, damage or even get stuck in the oil pipe, affecting the dehumidification efficiency. The design of the shaping resin sheet can ensure that the spring bends with the same arc to ensure that the center of gravity of the polyurethane column is always on the axis of the oil pipe, and the hollow design of the shaping resin sheet can ensure the fluidity of water in the polyurethane column to ensure the overall water absorption effect of the polyurethane column. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the detection connection structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the internal structure of the dual-channel dry pump of the present invention.

[0030] Figure 3 It is a schematic diagram of the cross-sectional structure of the dehumidifying sponge of the present invention.

[0031] Figure 4 It is a schematic diagram of the distribution structure of the oil pipe wrapping vertical disc of the present invention.

[0032] Figure 5 It is a schematic diagram of the distribution structure of multiple electromagnetic ring components of the present invention.

[0033] Figure 6 It is a schematic diagram of the connection structure of the electromagnetic ring assembly on one circle of oil pipe of the present invention.

[0034] Figure 7 This is a schematic diagram of the pressure curve of conventional nitrogen in the oil pipe.

[0035] Figure 8 It is a schematic diagram of the pressure curve of nitrogen in the oil pipe in the entire area of ​​the oil pipe according to the present invention.

[0036] Fig. 9 It is a schematic diagram of the pressure curve of nitrogen in the oil pipe at the air inlet end of the oil pipe according to the present invention.

[0037] As shown in the figure: 1. Oil pipe, 2. Dual-channel drying pump, 2.1. Connecting pipe, 2.2. Nitrogen pipe, 2.3. Sponge tube, 2.4. Nitrogen pump, 2.5. Propulsion piston, 3. Dehumidification sponge, 3.1. Polyurethane column, 3.2. Propulsion resin sheet, 3.3. Spring, 3.4. Synchronous resin sheet, 3.5. Molding resin sheet, 4. Electromagnetic ring assembly, 4.1. First electromagnetic ring, 4.2. Second electromagnetic ring, 5. Vertical plate, 6. Input device, 7. Detection equipment. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0039] A method for detecting and cleaning the compressive strength of a long-distance oil pipe comprises the following steps:

[0040] S1: Test a 10km oil pipe 1, perform high pressure sealing at one end of the oil pipe 1, and connect the other end of the oil pipe 1 to a hydraulic input testing machine;

[0041] S2: The hydraulic input detection integrated machine starts to inject water, fills up the oil pipe 1, and maintains the hydraulic pressure of 120 MPa for more than 48 hours;

[0042] S3: After confirming the pressure bearing capacity of the oil pipe 1, the high pressure seal at one end of the oil pipe 1 is released, and the hydraulic input detection integrated machine remains in a water injection state;

[0043] S4: intermittently detecting the particle size of the water discharged from one end of the oil pipe 1 to detect the cleaning quality of the oil pipe 1;

[0044] S5: After no particles are discharged from one end of the oil pipe 1, the hydraulic input detection integrated machine is replaced with a dual-channel dry pump 2;

[0045] S6: The dual-channel drying pump 2 continuously inputs nitrogen into the oil pipe 1, and intermittently inputs a number of dehumidification sponges 3, and the nitrogen pushes the dehumidification sponges 3 to move in the oil pipe 1 until they are discharged from one end of the oil pipe 1;

[0046] S7: moving one end of the oil pipe 1 to a dry environment and detecting the humidity of the air outlet at one end of the oil pipe 1;

[0047] S8: When the humidity of the gas out of the oil pipe 1 approaches zero and the dehumidification sponges 3 are all in a dry state, the nitrogen input is maintained. When the last piece of dehumidification sponge 3 is discharged from the oil pipe 1, the nitrogen input is stopped, and the inspection and cleaning operation of the oil pipe 1 is completed.

[0048] like Figure 1 As shown, an input device 6 and a detection device 7 are connected to both ends of the oil pipe 1. In steps S1-S3, the input device 6 only needs to be a hydraulic input detection integrated machine, and one end of the detection device 7 is sealed with a lead seal to meet the sealing of the oil pipe 1; in steps S4-S5, the input device 6 is still a hydraulic input detection integrated machine, and the detection device 7 is a particle size detector; in steps S6-S8, the input device 6 is a dual-channel dry pump 2, and the detection device 7 is a humidity detector. The above-mentioned hydraulic input detection integrated machine, particle size detector, and humidity detector are all conventional equipment.

[0049] like Figure 2 As shown, the dual-channel drying pump 2 includes a connecting pipe 2.1, a nitrogen pipe 2.2 and a sponge pipe 2.3. The diameters of the connecting pipe 2.1, the nitrogen pipe 2.2 and the sponge pipe 2.3 are the same as the diameters of the oil pipe 1. The connecting pipe 2.1 is connected to the other end of the oil pipe 1. The nitrogen pipe 2.2 and the sponge pipe 2.3 are both arranged at the end of the connecting pipe 2.1 away from the oil pipe 1. The nitrogen pipe 2.2 is used to input nitrogen into the oil pipe 1 through the connecting pipe 2.1. The sponge pipe 2.3 is used to inject the dehumidifying sponge 3 The oil pipe 1 is input through the connecting pipe 2.1, and the end of the nitrogen pipe 2.2 away from the connecting pipe 2.1 is connected to the nitrogen pump 2.4. The nitrogen pump 2.4 draws nitrogen from the nitrogen storage tank and transmits it to the connecting pipe 2.1. A propulsion piston 2.5 is arranged at the end of the sponge pipe 2.3 away from the connecting pipe. The propulsion piston 2.5 propels a piece of dehumidifying sponge 3 forward at intervals to make the dehumidifying sponge 3 enter the connecting pipe 2.1. The propulsion interval is determined by the pushing pressure of the nitrogen pump 2.4. Manual propulsion can be adopted, and automatic propulsion can also be adopted by connecting to automatic equipment.

[0050] like Figure 2 , Figure 3As shown, the dehumidification sponge 3 includes a polyurethane column 3.1 as a main body and a propulsion resin sheet 3.2 arranged at one end of the main body. The dehumidification sponge 3 is cylindrical, and the diameter of the dehumidification sponge 3 is equal to the inner diameter of the oil pipe 1. The surface of the polyurethane column 3.1 is provided with a resin coating, and a spring 3.3 is provided on the axis of the polyurethane column 3.1. The two ends of the spring 3.3 are respectively fixedly connected to the two ends of the polyurethane column 3.1. The end of the polyurethane column 3.1 away from the propulsion resin sheet 3.2 is provided with a synchronous resin sheet 3.4. The synchronous resin sheet 3.4 is arranged on the axis of the polyurethane column 3.1, the diameter of the synchronous resin sheet 3.4 is smaller than the diameter of the polyurethane column 3.1, one end of the spring 3.3 is fixedly connected to the synchronous resin sheet 3.4, and the other end of the spring 3.3 is fixedly connected to the propulsion resin sheet 3.2. A shaping resin sheet 3.5 is arranged in the middle section of the polyurethane column 3.1, and the shaping resin sheet 3.5 is hollowed out. The diameter of the shaping resin sheet 3.5 is the same as the inner diameter of the oil pipe 1, and the shaping resin sheet 3.5 is fixedly connected to the middle section of the spring 3.3.

[0051] During the assembly of the dehumidification sponge 3, the polyurethane column 3.1 and the propulsion resin sheet 3.2, the spring 3.3 and the synchronization resin sheet 3.4, the spring 3.3 and the propulsion resin sheet 3.2, and the polyurethane column 3.1 and the synchronization resin sheet 3.4 are all bonded with waterproof glue, while the spring 3.3 and the polyurethane column 3.1, and the spring 3.3 and the shaping resin sheet 3.5 are directly inserted by spirally inserting the spring 3.3, thereby ensuring the synchronization of deformation between the spring 3.3, the polyurethane column 3.1, and the shaping resin sheet 3.5.

[0052] like Figure 4-6As shown, the oil pipe 1 is wrapped around the vertical plate 5 in a layer-by-layer expansion manner during detection, and a plurality of groups of electromagnetic ring assemblies 4 for stretching springs 3.3 are provided on the oil pipe 1. The plurality of groups of electromagnetic ring assemblies 4 are respectively arranged on a circle of oil pipe 1 that abuts against the two ends of the vertical plate 5, and the electromagnetic ring assemblies 4 on the same end are arranged in layers, which is equivalent to arranging an electromagnetic ring assembly 4 every 100-300m. The electromagnetic ring assembly 4 includes a first electromagnetic ring 4.1 and a second electromagnetic ring 4.2. The spacing between the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2 is greater than the length of the dehumidification sponge 3. The electromagnetic ring assembly 4 is detachably wrapped around the outer layer of the oil pipe 1, and the second electromagnetic ring 4.2 is arranged directly above a circle of oil pipe 1. The first electromagnetic ring 4.1 is arranged upstream of the second electromagnetic ring 4.2. During the movement of the dehumidification sponge 3, when the dehumidification sponge 3 is in When the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2 are both upstream, that is, the dehumidification sponge 3 is on the side of the first electromagnetic ring 4.1 away from the second electromagnetic ring 4.2, the spring 3.3 is accelerated by the common electromagnetic force of the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2, and helps to overcome the gravity of the dehumidification sponge 3. When the dehumidification sponge 3 moves to the middle of the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2, the two ends of the spring 3.3 are respectively stretched by the electromagnetic force of the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2. When the dehumidification sponge 3 is both downstream of the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2, the spring 3.3 is decelerated by the common electromagnetic force of the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2, but under the action of its own gravity, the dehumidification sponge 3 can quickly separate from the electromagnetic ring assembly 4.

[0053] The magnetic poles formed by the first electromagnetic ring 4.1 and the second electromagnetic ring 4.2 are in opposite directions.

[0054] Because the oil pipe 1 has an expanded diameter during the storage process, in order to ensure that the electromagnetic ring assembly 4 is arranged on a circle of the oil pipe 1 that abuts against the two ends of the vertical plate 5, the distance between two adjacent electromagnetic ring assemblies 4 will increase as the storage distance increases.

[0055] To facilitate the detachable connection of the electromagnetic ring assembly 4 to the oil pipe 1, when the oil pipe 1 is stored, the electromagnetic ring assembly 4 can be wrapped around it when the oil pipe 1 is stored at both ends of the vertical plate 5. However, this solution is likely to cause squeezing of the electromagnetic ring assembly 4 during the subsequent storage process of the oil pipe 1, which may cause damage to the electromagnetic ring assembly 4. Alternatively, when the oil pipe 1 is stored, when the oil pipe 1 is stored at both ends of the vertical plate 5, a wedge block can be placed between the oil pipes 1 to form a gap, and at the same time, the limit positions at both ends of the vertical plate 5 can be hollowed out. After all the oil pipes 1 are stored, the electromagnetic ring assembly 4 can be installed by using the gap and the hollow structure on the vertical plate 5.

[0056] like Figure 7As shown, the traditional nitrogen drying solution uses an air pressure of 30MPa, which is more suitable for drying oil pipes 1 with a length of less than 6km. When the length is longer than 6km, the nitrogen pressure will drop significantly, which is not conducive to the pushing of the dehumidification sponge 3 in the subsequent length. When pushing multiple dehumidification sponges 3 at the same time, it may also cause the dehumidification sponge 3 to be trapped in the oil pipe 1 and cannot be pushed.

[0057] like Figure 8-9 As shown, the detection method of the present invention adopts an air pressure of 30MPa, which can still maintain a good air pressure for the oil pipe 1 with a length of about 9km, which is beneficial to the drying of the oil pipe 1, and the higher the air pressure, the faster the pushing speed of the dehumidification sponge 3, which can greatly increase the drying efficiency of the oil pipe 1.

[0058] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A method for testing and cleaning the compressive strength of a long-distance oil pipeline, characterized in that: The following steps are involved: S1: Perform high pressure sealing at one end of the oil pipe (1), and connect the other end of the oil pipe (1) to a hydraulic input detection integrated machine; S2: The hydraulic input detection integrated machine starts to inject water, fills the oil pipe (1), and maintains a hydraulic pressure of not less than 120 MPa for more than 48 hours; S3: After confirming the pressure bearing capacity of the oil pipe (1), the high pressure seal at one end of the oil pipe (1) is released, and the hydraulic input detection integrated machine remains in a water injection state; S4: intermittently detecting the particle size of the water discharged from one end of the oil pipe (1) to detect the cleaning quality of the oil pipe (1); S5: After no particles are discharged from one end of the oil pipe (1), the hydraulic input detection integrated machine is replaced with a dual-channel dry pump (2); S6: The dual-channel drying pump (2) continuously inputs nitrogen into the oil pipe (1) and intermittently inputs a plurality of dehumidifying sponges (3). The nitrogen pushes the dehumidifying sponges (3) to move in the oil pipe (1) until the dehumidifying sponges (3) are discharged from one end of the oil pipe (1); S7: moving one end of the oil pipe (1) to a dry environment and detecting the humidity of the air outlet at the one end of the oil pipe (1); S8: After the humidity of the air out of the oil pipe (1) approaches zero and the dehumidification sponges (3) are all in a dry state, the nitrogen input is maintained. After the last piece of dehumidification sponge (3) is discharged from the oil pipe (1), the nitrogen input is stopped, and the inspection and cleaning operation of the oil pipe (1) is completed.

2. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 1, characterized in that: The dual-channel drying pump (2) comprises a connecting pipe (2.1), a nitrogen pipe (2.2) and a sponge pipe (2.3); the pipe diameters of the connecting pipe (2.1), the pipe diameters of the nitrogen pipe (2.2) and the sponge pipe (2.3) are all the same as the pipe diameter of the oil pipe (1); the connecting pipe (2.1) is connected to the other end of the oil pipe (1); the nitrogen pipe (2.2) and the sponge pipe (2.3) are both arranged at one end of the connecting pipe (2.1) away from the oil pipe (1); the nitrogen pipe (2.2) is used to input nitrogen into the oil pipe (1) through the connecting pipe (2.1); and the sponge pipe (2.3) is used to input the dehumidifying sponge (3) into the oil pipe (1) through the connecting pipe (2.1).

3. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 2, characterized in that: The dehumidification sponge (3) comprises a polyurethane column (3.1) as a main body and a propulsion resin sheet (3.2) arranged at one end of the main body. The dehumidification sponge (3) is cylindrical, and the diameter of the dehumidification sponge (3) is equal to the inner diameter of the oil pipe (1).

4. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 3, characterized in that: The surface of the polyurethane column (3.1) is provided with a resin coating.

5. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 3, characterized in that: A spring (3.3) is provided on the axis of the polyurethane column (3.1), and the two ends of the spring (3.3) are respectively fixedly connected to the two ends of the polyurethane column (3.1). A group of electromagnetic ring assemblies (4) for stretching the spring (3.3) are provided at intervals on the oil pipe (1). The electromagnetic ring assembly (4) comprises a first electromagnetic ring (4.1) and a second electromagnetic ring (4.2). The distance between the first electromagnetic ring (4.1) and the second electromagnetic ring (4.2) is greater than the length of the dehumidifying sponge (3). The electromagnetic ring assembly (4) can be detachably wrapped around the outer layer of the oil pipe (1). When the dehumidifying sponge (3) is moved, when the dehumidifying sponge (3) is in the first electromagnetic ring (4.2), the electromagnetic ring assembly (4) is detachably wrapped around the outer layer of the oil pipe (1). .1) and the second electromagnetic ring (4.2), the spring (3.3) is accelerated by the common electromagnetic force of the first electromagnetic ring (4.1) and the second electromagnetic ring (4.2); when the dehumidifying sponge (3) moves to the middle of the first electromagnetic ring (4.1) and the second electromagnetic ring (4.2), the two ends of the spring (3.3) are respectively acted on by the electromagnetic force of the first electromagnetic ring (4.1) and the second electromagnetic ring (4.2) to stretch; when the dehumidifying sponge (3) is in the common downstream of the first electromagnetic ring (4.1) and the second electromagnetic ring (4.2), the spring (3.3) is decelerated by the common electromagnetic force of the first electromagnetic ring (4.1) and the second electromagnetic ring (4.2).

6. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 5, characterized in that: During testing, the oil pipe (1) is wrapped around the vertical plate (5) in a manner of expanding its diameter layer by layer, and a plurality of sets of electromagnetic ring assemblies (4) are respectively arranged on a circle of the oil pipe (1) that abuts against both ends of the vertical plate (5), and the electromagnetic ring assemblies (4) on the same end are arranged in a spacer layer.

7. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 6, characterized in that: The second electromagnetic ring (4.2) is arranged directly above a circle of oil pipe (1), and the first electromagnetic ring (4.1) is arranged upstream of the second electromagnetic ring (4.2).

8. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 7, characterized in that: The magnetic poles formed by the first electromagnetic ring (4.1) and the second electromagnetic ring (4.2) are in opposite directions.

9. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 5, characterized in that: A synchronous resin sheet (3.4) is provided at one end of the polyurethane column (3.1) away from the propulsion resin sheet (3.2); the synchronous resin sheet (3.4) is arranged on the axis of the polyurethane column (3.1); the diameter of the synchronous resin sheet (3.4) is smaller than the diameter of the polyurethane column (3.1); one end of the spring (3.3) is fixedly connected to the synchronous resin sheet (3.4); and the other end of the spring (3.3) is fixedly connected to the propulsion resin sheet (3.2).

10. A method for detecting and cleaning the compressive strength of a long-distance oil pipe according to claim 9, characterized in that: A shaping resin sheet (3.5) is provided in the middle section of the polyurethane column (3.1); the shaping resin sheet (3.5) is hollowed out; the diameter of the shaping resin sheet (3.5) is the same as the inner diameter of the oil pipe (1); and the shaping resin sheet (3.5) is fixedly connected to the middle section of the spring (3.3).

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