Special high-pressure oil-gas bimetallic composite pipe

Abstract

The utility model discloses a kind of high-pressure oil gas special bimetallic composite pipe, it is related to oil and gas conveying pipe material technical field, including inner tube, the outer wall of the inner tube is equipped with outer tube, the outer wall of the outer tube is equipped with anticorrosion protective sleeve, the outer wall of the outer tube is equipped with storage box, the upper end of the storage box is equipped with alarm.The utility model, leakage monitoring and processing intelligence: through oil collection tank collection leakage oil gas, liquid level sensor real-time monitoring liquid level and transmission to control module, when liquid level reaches the volume of oil collection tank, control module automatically controls electro-hydraulic linkage valve to open oil discharge, after liquid level drops, it is automatically closed, simultaneously trigger audible light alarm to alarm and data remote transmission to monitoring center, realize the whole process automation of leakage "monitoring-alarm-processing", response time is improved, avoid leakage oil gas accumulation corrosion outer tube or cause safety accident.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas transmission pipe technology, and in particular to a high-pressure oil and gas special bimetallic composite pipe. Background Technology

[0002] High-pressure oil and gas often contain acidic gases such as CO2 and H2S. When the ambient temperature is below 60℃, the FeCO3 formed by localized corrosion of HCO3- has poor adhesion and cannot form a dense, protective corrosion product film. It is very easy to accumulate in the pipeline. Moreover, the bottom of the pipeline is always in contact with the transported medium. Compared with other parts of the pipeline, the bottom of the pipeline is more prone to corrosion perforation.

[0003] For example, Chinese patent CN212900160U discloses a high-pressure oil and gas special bimetallic composite pipe, which includes an inner pipe and an outer pipe made of metal, and an axially formed long strip-shaped oil collection groove at the bottom of the inner side wall of the outer pipe. An oil discharge pipe connected to the oil collection groove is welded and fixed to the outer side wall of the outer pipe. Several heating bands are provided on the outer side wall of the outer pipe, and the heating bands are wrapped around the outer side wall of the outer pipe. A protective sleeve device is provided on the outside of the heating bands.

[0004] However, in the existing technology, such as the aforementioned patent, although the oil and gas leaked after the inner pipe is corroded is collected by reserving an oil collection tank and discharged through the oil drain pipe, the monitoring method for the amount of oil and gas in the oil collection tank is not clearly defined, and there is also a lack of overflow prevention and outer pipe anti-corrosion reinforcement design. If the oil collection tank is full and cannot be discharged in time, the leaked oil and gas will be in contact with the outer pipe (base pipe) for a long time, causing the outer pipe to corrode and fail, which in turn leads to the leakage of oil and gas into the surrounding environment, causing safety and environmental risks. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art by proposing a high-pressure oil and gas special bimetallic composite pipe.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-pressure oil and gas special bimetallic composite pipe, comprising an inner pipe, an outer pipe installed on the outer wall of the inner pipe, an anti-corrosion protective sleeve fitted on the outer wall of the outer pipe, a storage box installed on the outer wall of the outer pipe, an alarm installed at the upper end of the storage box, an oil drain pipe welded through the outer wall of the outer pipe, one end of the oil drain pipe penetrating the inner wall of the anti-corrosion protective sleeve and extending to its outer side, one end of the oil drain pipe being fixedly connected to an electro-hydraulic linkage valve, an oil collection groove formed on the inner wall of the outer pipe, a control module installed inside the storage box, and a liquid level sensor installed at the top of the inside of the oil collection groove.

[0007] Preferably, the electro-hydraulic linkage valve and the liquid level sensor are both connected to the control module via signal connection, the alarm is connected to the control module via signal connection, and the control module can communicate with peripheral devices.

[0008] Preferably, the upper part of the storage box penetrates the inner wall of the anti-corrosion protective sleeve and extends to its outer side, and the other end of the oil drain pipe extends into the interior of the oil collection tank.

[0009] Preferably, the oil collection tank is provided with multiple sets of reinforcing blocks inside, and the inner wall of the outer pipe is coated with a corrosion-resistant coating.

[0010] Preferably, one end of each set of reinforcing blocks is fixed to the outer wall of the inner tube, and the other end of each set of reinforcing blocks is fixed to the inner wall of the corrosion-resistant coating.

[0011] Preferably, the drain port of the electro-hydraulic linkage valve is detachably equipped with an external connecting pipe.

[0012] Preferably, both ends of the inner and outer pipes are fitted with sealing bevels, and both ends of the inner and outer pipes, located outside the sealing bevels, are fitted with connecting flanges.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, leakage monitoring and handling are intelligent: leaked oil and gas are collected through an oil collection tank, and the liquid level sensor monitors the liquid level in real time and transmits the data to the control module. When the liquid level is about to reach the volume of the oil collection tank, the control module automatically controls the electro-hydraulic linkage valve to open and discharge oil. After the liquid level drops completely, the valve automatically closes. At the same time, an audible and visual alarm is triggered and the data is remotely transmitted to the monitoring center, realizing the full automation of the "monitoring-alarm-handling" process of leakage. The response time is improved, and the accumulation of leaked oil and gas is prevented from corroding the outer pipe or causing safety accidents.

[0014] 2. This utility model has excellent structural strength and corrosion resistance: the inner tube is made of corrosion-resistant alloy material with optional anti-scaling coating, and the outer tube is made of high-strength carbon steel with a corrosion-resistant coating on the inner wall, forming a double corrosion barrier; the high-temperature pressure fusion anchoring process realizes atomic-level bonding between the inner and outer tubes, and with the multiple sets of reinforcing blocks in the oil collection groove, it not only improves the interlayer bonding strength, but also makes up for the strength shortness in the oil collection groove area, so that the pipe body can withstand the high pressure load of ultra-deep wells and resist the erosion of highly corrosive media. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of a high-pressure oil and gas dedicated bimetallic composite pipe is provided for this utility model. Figure 2 This utility model provides a partial half-sectional perspective view of a high-pressure oil and gas dedicated bimetallic composite pipe; Figure 3 This utility model provides a partial side view half-section structural diagram of a high-pressure oil and gas dedicated bimetallic composite pipe; Figure 4 This utility model proposes a high-pressure bimetallic composite pipe specifically for oil and gas. Figure 3 A magnified structural diagram of A in the middle.

[0016] Legend: 1. Inner pipe; 2. Anti-corrosion protective sleeve; 3. Sealing bevel; 4. Connecting flange; 5. Storage box; 6. Alarm; 7. Oil drain pipe; 8. Electro-hydraulic linkage valve; 9. Outer pipe; 10. Oil collection tank; 11. Reinforcing block; 12. Outer pipe; 13. Control module; 14. Corrosion-resistant coating; 15. Liquid level sensor. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example 1: As Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides a high-pressure oil and gas special bimetallic composite pipe, including an inner pipe 1, an outer pipe 9 installed on the outer wall of the inner pipe 1, a corrosion-resistant protective sleeve 2 covering the outer wall of the outer pipe 9, a storage box 5 installed on the outer wall of the outer pipe 9, an alarm 6 installed at the upper end of the storage box 5, an oil drain pipe 7 welded through the outer wall of the outer pipe 9, and one end of the oil drain pipe 7 penetrates the inner wall of the corrosion-resistant protective sleeve 2 and extends to its outer side, and one end of the oil drain pipe 7 is fixedly connected to an electro-hydraulic linkage valve 8, an oil collection tank 10 is opened on the inner wall of the outer pipe 9, a control module 13 is installed inside the storage box 5, a liquid level sensor 15 is installed at the top of the oil collection tank 10, the electro-hydraulic linkage valve 8 and the liquid level sensor 15 are both signal connected to the control module 13, the alarm 6 is signal connected to the control module 13, the control module 13 can communicate with peripheral devices, the upper part of the storage box 5 penetrates the inner wall of the corrosion-resistant protective sleeve 2 and extends to its outer side, and the other end of the oil drain pipe 7 extends into the interior of the oil collection tank 10.

[0020] The oil collection tank 10 is equipped with multiple sets of reinforcing blocks 11. The inner wall of the outer pipe 9 is covered with a corrosion-resistant coating 14. One end of each set of reinforcing blocks 11 is fixed to the outer wall of the inner pipe 1, and the other end of each set of reinforcing blocks 11 is fixed to the inner wall of the corrosion-resistant coating 14. The oil outlet of the electro-hydraulic linkage valve 8 is detachably equipped with an outer pipe 12.

[0021] The specific settings and functions of this embodiment are described below. Inner tube 1 (corrosion-resistant functional layer): Made of corrosion-resistant alloy material, inner tube 1 is in direct contact with corrosive oil and gas media such as H2S and CO2. Its material meets the NACETM0177 standard and can effectively resist the erosion of corrosive media. The inner wall of inner tube 1 can also be sprayed with Al2O3 ceramic anti-scaling coating as needed to reduce the risk of impurities adhering in oil and gas. Outer tube 9 (strength support layer): Made of high-strength steel grade that meets the API Spec 5CT standard, outer tube 9 is sleeved on the outer wall of inner tube 1. It achieves atomic-level metallurgical bonding with inner tube 1 through high-temperature pressure fusion anchoring process, completely avoiding interlayer peeling problems, providing stable support for the tube body, and can withstand the high pressure load of ultra-deep wells above 5000 meters and the weight of the tubing string itself.

[0022] Strengthened and corrosion-resistant structure: The inner wall of the outer pipe 9 is coated with a corrosion-resistant coating 14, which is made of epoxy ceramic material, further improving the corrosion resistance of the inner wall of the outer pipe 9; multiple sets of reinforcing blocks 11 are set inside the oil collection groove 10 between the inner pipe 1 and the outer pipe 9. The reinforcing blocks 11 are made of carbon steel of the same material as the outer pipe 9 and are fan-shaped. One end of each set of reinforcing blocks 11 is fixed to the outer wall of the inner pipe 1 by welding, and the other end is tightly attached to and welded to the inner wall of the corrosion-resistant coating 14. This not only enhances the connection stability between the inner pipe 1 and the outer pipe 9, but also avoids the strength reduction caused by structural gaps in the oil collection groove 10 area.

[0023] Corrosion protection structure: The outer wall of the outer pipe 9 is fitted with a corrosion protection sleeve 2. The corrosion protection sleeve 2 is made of high-density polyethylene (HDPE) and is tightly fitted to the outer wall of the outer pipe 9 using a heat shrink wrapping process. The corrosion protection sleeve 2 can effectively isolate the outer pipe 9 from the underground humid environment and corrosive ions in the soil, while resisting mechanical wear during underground construction and operation, thus extending the service life of the outer pipe 9. The corrosion protection sleeve 2 has pre-set openings at the positions of the storage box 5 and the oil drain pipe 7. The edges of the openings are heat-sealed to ensure the integrity of the corrosion protection.

[0024] Leakage monitoring and oil drainage system: In order to realize timely monitoring and treatment after leakage of inner pipe 1, a complete monitoring and oil drainage system is set up, which includes: oil collection tank 10 is opened on the inner wall of outer pipe 9 and is set at intervals along the axial direction of the pipe body. The oil collection tank 10 has a ring structure and a U-shaped cross section. The function of the oil collection tank 10 is to collect the oil and gas medium that seeps into the inner pipe 1 after leakage, to prevent the medium from spreading randomly in the gap between inner and outer pipe 9, and to provide a stable carrier for subsequent oil drainage and monitoring. Oil discharge structure: An oil discharge pipe 7 is welded through the outer wall of the outer pipe 9. The oil discharge pipe 7 is made of 316L stainless steel. One end of the oil discharge pipe 7 passes through the inner wall of the anti-corrosion protective sleeve 2 and extends to its outer side. The other end extends into the interior of the oil collection tank 10 and the port is lower than the bottom of the oil collection tank 10 to ensure that the oil and gas in the oil collection tank 10 can be completely discharged. The outer end of the oil discharge pipe 7 is fixedly connected to an electro-hydraulic linkage valve 8. The electro-hydraulic linkage valve 8 is a high-pressure valve. Its oil discharge port is detachably installed with an outer pipe 12 through a flange. The outer pipe 12 can be connected to the wellhead oil and gas recovery main pipeline to realize the recovery and utilization of leaked oil and gas. Monitoring and Control Components: A storage box 5 is welded and fixed to the outer wall of the outer pipe 9. The storage box 5 is made of stainless steel and has waterproof, dustproof, and corrosion-resistant functions. A control module 13 is installed inside the storage box 5. The control module 13 uses an industrial-grade PLC controller and has signal acquisition, logic judgment, and communication functions. A liquid level sensor 15 is installed at the top of the inside of the oil collection tank 10. The liquid level sensor 15 is a capacitive high-pressure liquid level sensor, which can work stably in high-pressure and high-corrosion environments. The liquid level sensor 15 is connected to the control module 13 via a high-temperature shielded wire to transmit the liquid level signal in the oil collection tank 10. The signal is transmitted in real time to the control module 13. The electro-hydraulic linkage valve 8 is connected to the control module 13 via hydraulic control pipelines and signal wires, and its opening and closing are controlled by the control module 13. An alarm 6 is installed at the top of the storage box 5. The alarm 6 adopts an audible and visual alarm design, and the alarm light is red flashing. The alarm 6 is connected to the control module 13. When a leak occurs and the liquid level reaches the warning value, the alarm is triggered. The control module 13 can also communicate with external devices (such as wellhead control cabinets and remote monitoring centers) via 4G / 5G or industrial Ethernet to realize remote transmission and remote control of liquid level data. The upper part of the storage box 5 penetrates the inner wall of the anti-corrosion protective sleeve 2 and extends to its outer side to ensure that the audible and visual signals of the alarm 6 can be effectively transmitted, while also facilitating the maintenance of the control module 13.

[0025] Example 2: Figure 1 As shown, both ends of the inner pipe 1 and the outer pipe 9 are equipped with sealing bevels 3, and both ends of the inner pipe 1 and the outer pipe 9, located outside the sealing bevels 3, are equipped with connecting flanges 4.

[0026] The overall effect achieved by this embodiment is as follows: Connection structure: To achieve a reliable connection between the pipe body and the well string, both ends of the inner pipe 1 and the outer pipe 9 are integrally processed to form a sealing bevel 3. The sealing bevel 3 is a 30° single V-shaped bevel, with the ends of the inner pipe 1 and the outer pipe 9 flush to ensure sealing when the bevels are joined. Both ends of the inner pipe 1 and the outer pipe 9, located outside the sealing bevel 3, are welded with connecting flanges 4. The connecting flanges 4 are forged from carbon steel of the same material as the outer pipe 9. The flange sealing surface adopts a raised face design and is equipped with a corrosion-resistant metal gasket to further improve the connection sealing performance. The outer surface of the connecting flanges 4 is coated with an epoxy coal tar anti-corrosion coating to prevent corrosion at the connection points.

[0027] The usage and working principle of this device: Core conveying and protection: The inner tube 1 (corrosion-resistant alloy) is in direct contact with high-pressure and highly corrosive oil and gas media, and resists H2S / CO2 erosion with its corrosion resistance; the outer tube 9 (high-strength carbon steel) is metallurgically combined with the inner tube 1 through high-temperature pressure fusion anchoring, providing high-pressure load support; the inner wall corrosion-resistant coating 14 + the outer wall anti-corrosion protective sleeve strengthens the whole-link anti-corrosion; the inner reinforcing block 11 of the oil collection tank 10 takes into account the stability of interlayer connection and structural strength. Leakage Monitoring and Handling: After the inner pipe 1 leaks, oil and gas seep into the annular oil collection tank 10; the liquid level sensor 15 monitors the liquid level in real time and transmits the data to the control module 13. When the liquid level reaches 80%, the electro-hydraulic linkage valve 8 is automatically opened, and the oil and gas are discharged into the recovery system through the drain pipe 7 and the outer pipe 12. After the liquid level drops completely, the valve is closed; at the same time, the alarm 6 triggers an audible and visual alarm, and the control module 13 transmits data to external equipment in a synchronized manner. Reliable connection: The combination of sealing bevels at both ends and connecting flanges achieves high-pressure sealing through raised face sealing and corrosion-resistant gaskets, making it suitable for pipe docking needs in scenarios such as vertical installation in deep wells and underground pre-buried installations.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A high-pressure oil and gas-specific bimetallic composite pipe, comprising an inner pipe (1), characterized in that: The outer wall of the inner tube (1) is fitted with an outer tube (9), the outer wall of the outer tube (9) is fitted with a corrosion-resistant protective sleeve (2), the outer wall of the outer tube (9) is fitted with a storage box (5), the upper end of the storage box (5) is fitted with an alarm (6), the outer wall of the outer tube (9) is welded through an oil drain pipe (7), and one end of the oil drain pipe (7) penetrates the inner wall of the corrosion-resistant protective sleeve (2) and extends to its outer side. One end of the oil drain pipe (7) is fixedly connected to an electro-hydraulic linkage valve (8), the inner wall of the outer tube (9) is provided with an oil collection groove (10), the storage box (5) is fitted with a control module (13), and the top of the oil collection groove (10) is fitted with a liquid level sensor (15).

2. The high-pressure oil and gas bimetallic composite pipe according to claim 1, characterized in that: The electro-hydraulic linkage valve (8) and the liquid level sensor (15) are both connected to the control module (13) by signal. The alarm (6) is connected to the control module (13) by signal. The control module (13) can communicate with peripheral devices.

3. The high-pressure oil and gas bimetallic composite pipe according to claim 1, characterized in that: The upper part of the storage box (5) penetrates the inner wall of the anti-corrosion protective sleeve (2) and extends to its outer side, while the other end of the oil drain pipe (7) extends into the interior of the oil collection tank (10).

4. The high-pressure oil and gas bimetallic composite pipe according to claim 1, characterized in that: The oil collection tank (10) is provided with multiple sets of reinforcing blocks (11), and the inner wall of the outer tube (9) is equipped with a corrosion-resistant coating (14).

5. A high-pressure oil and gas bimetallic composite pipe according to claim 4, characterized in that: One end of each of the multiple sets of reinforcing blocks (11) is fixed to the outer wall of the inner tube (1), and the other end of each of the multiple sets of reinforcing blocks (11) is fixed to the inner wall of the corrosion-resistant coating (14).

6. The high-pressure oil and gas bimetallic composite pipe according to claim 1, characterized in that: The drain port of the electro-hydraulic linkage valve (8) is detachably fitted with an external pipe (12).

7. A high-pressure bimetallic composite pipe for oil and gas as described in claim 1, characterized in that: Both ends of the inner tube (1) and the outer tube (9) are equipped with sealing bevels (3), and both ends of the inner tube (1) and the outer tube (9) are equipped with connecting flanges (4) located outside the sealing bevels (3).

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