An offshore platform riser detection device

Abstract

The present invention discloses an offshore platform riser detection device, including ultrasonic guided wave detection equipment, low-energy ray detection equipment and riser detection fixing equipment; the ultrasonic guided wave detection equipment includes an array sensor and a signal conditioning module connected to each other, the array sensor is arranged along the outer circumference of the riser to be inspected, and the signal conditioning module is connected to the data acquisition and analysis module of the computer system; the riser detection fixing equipment includes a steel fixed frame, on which a magnetic adsorption component, a ray source fixing component, and a detector fixing component are arranged; the low-energy ray detection equipment includes a ray source and a detector, and the detector is connected to the data acquisition and analysis module of the computer system. The present invention can realize accurate and rapid detection of offshore platform risers, find the defect position and defect form of the riser, and is suitable for corrosion detection and corrosion condition evaluation of offshore platform risers.

Description

Technical Field

[0001] The present invention relates to the field of offshore platform riser detection, and more specifically, to an offshore platform riser detection device. Background Art

[0002] The riser of the offshore platform has its own characteristics. The external corrosion zone of the riser starts from the atmospheric zone, passes through the splash zone, tidal zone, full immersion zone, and sea mud zone. The corrosion situation is complex and changeable, especially the splash zone, which is the hardest hit area for external corrosion in the marine environment.

[0003] For a long time, the in-service inspection and evaluation of risers and emergency maintenance on domestic offshore platforms have been scattered, and an overall effective means of hidden danger detection and defect assessment has not yet been formed. China National Offshore Oil Corporation has carried out a variety of detection technologies for riser corrosion, including low-frequency guided waves, MsS, ultrasonic thickness measurement and water penetration detection, but the results are not ideal, especially for the inner tube of the double-layer riser and the inside of the riser clip. There are blind spots in the detection, which has become a hidden danger to the safe operation of submarine pipelines. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and propose a rationally designed, scientifically designed and effective offshore platform riser detection device, which makes up for the deficiencies in the current offshore oil riser detection technology on the market. Through the application of this detection method, the riser detection can be accurate and reliable, especially the detection of blind spots such as the inner tube of the double-layer riser and the inside of the riser clip, solving the hidden dangers of the safe operation of the submarine pipeline.

[0005] The objectives of the present invention are achieved through the following technical solutions.

[0006] The offshore platform riser detection device of the present invention comprises an ultrasonic guided wave detection device, a low-energy ray detection device and a riser detection fixing device;

[0007] The ultrasonic guided wave detection equipment comprises an array sensor and a signal conditioning module interconnected by a signal line, the array sensor is arranged along the outer circumference of the standpipe to be inspected, and the signal conditioning module is connected to a data acquisition and analysis module of a computer system through a data transmission line;

[0008] The standpipe inspection and fixing device comprises a steel fixing frame, on which a magnetic adsorption component, a radiation source fixing component and a detector fixing component are arranged, and the steel fixing frame is fixed to the outside of the standpipe to be inspected by the magnetic adsorption component, and the radiation source fixing component and the detector fixing component are arranged on two opposite sides of the steel fixing frame;

[0009] The low-energy radiation detection device comprises a radiation source and a detector. The radiation source is fixed on a radiation source fixing component, the detector is fixed on a detector fixing component, and the detector is connected to a data acquisition and analysis module of a computer system via a signal line.

[0010] The steel fixed frame is configured to be formed by two semicircular frame parts connected by a slipknot, and the cross-sectional shape of the steel fixed frame is the same as the shape of the riser to be inspected; during installation, one part is put in place first, and the magnetic adsorption component of the part is energized to generate magnetic force, and the part is adsorbed on the wall of the riser to be inspected by the magnetic force, and then the other part is put in place, and the magnetic adsorption component is also energized to generate magnetic force, and fixed on the wall of the riser to be inspected, and finally, the slipknot is connected to combine the two parts together to form a stable fixing condition.

[0011] An ultrasonic guided wave detection device is installed on the upper part of the riser to be inspected. After the ultrasonic guided wave detection device is in place, the guided wave detection is started. The relevant instructions are transmitted to the signal conditioning module through the data acquisition and analysis module of the computer system. The signal conditioning module transmits the modulated detection signal to the array sensor. The array sensor propagates the signal along the wall of the riser to be inspected. After encountering a defect, the signal is fed back to the array sensor. The array sensor transmits the echo signal back to the signal conditioning module for demodulation and then feeds it back to the data acquisition and analysis module. The analysis result is output in the computer system, so as to determine the defect area range of the riser to be inspected.

[0012] After the low-energy ray detection equipment is installed, the ray detection is started. The ray source emits X-rays vertically to the defective area of ​​the riser to be inspected. The X-rays pass through the riser to be inspected and are projected onto the detector, converted into electrical signals, and transmitted to the data collection and analysis module of the computer system. After analysis, the morphology and size of the defect in the riser to be inspected are obtained.

[0013] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0014] (1) Technical value: Improve the company's offshore oil pipeline inspection technology level, provide a feasible method for offshore oil pipeline riser inspection, and make up for the lack of riser inspection capabilities.

[0015] (2) Economic value: More than 20 failure cases have occurred in offshore platform risers in the Bohai Sea so far, and riser detection technology is a difficult problem that needs to be solved urgently. The implementation of this technology can provide reliable data support for the corrosion evaluation of risers, become the market promotion basis for riser corrosion monitoring and evaluation services, and build a professional team for riser corrosion monitoring and detection. In addition, this technology can fill the gap in the technical means of monitoring and detection of submarine pipeline risers and make up for the shortcomings of submarine pipeline integrity management.

[0016] (3) Application value: This riser detection device can detect the riser of offshore platforms, fill the technical gap of online detection of riser corrosion in China, realize the reliability and accuracy of riser detection data, and provide reference data for riser corrosion assessment, such as corrosion location, size, appearance and shape. The detection device meets the requirements of personnel safety and convenient operation.

[0017] (4) Existing riser inspection methods all use a single inspection technology, such as low-frequency guided waves, MsS, ultrasonic thickness and water penetration inspection, etc. These technologies all have the problem of unreliable data. The inspection device proposed in this invention uses a combination of ultrasonic guided waves and low-energy rays to locate the defects of the riser through ultrasonic guided waves, and then uses low-energy rays to verify and accurately detect the defect points.

[0018] (5) The existing riser detection method has detection blind spots for the inner tube of the double-layer riser and the inside of the riser clamp. The device of the present invention can detect the above detection blind spots.

[0019] (6) The detection results of the present invention are more reliable and accurate, and can measure the wall thickness thinning identification of not less than 10%, the corrosion product identification thickness of not less than 5mm, and the layered material identification density difference of not more than 500kg / m 3 .

[0020] (7) The detection process of the present invention is more efficient. The ultrasonic guided wave detection system can quickly lock corrosion and achieve accurate detection. The present invention can penetrate the riser flange to detect the position of the riser clip, and can penetrate the riser flange for detection up to 5 meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a working principle diagram of the ultrasonic guided wave detection equipment in the present invention.

[0022] Figure 2 It is a schematic diagram of the neutral pipe detection fixing device of the present invention.

[0023] Figure 3 The present invention is a flowchart of the offshore platform riser detection device.

[0024] Figure numerals: 1 data acquisition and analysis module, 2 signal conditioning module, 3 standpipe to be inspected, 4 array sensor, 5 steel fixed frame, 6 magnetic adsorption component, 7 ray source fixed component, 8 detector fixed component, 9 slipknot. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] The offshore platform riser detection device of the present invention includes an ultrasonic guided wave detection device, a low-energy ray detection device and a riser detection fixing device, which integrates the two detection technologies of ultrasonic guided wave and low-energy ray, and can realize accurate and rapid detection of offshore platform risers, find the defect position and defect form of the riser, and is used for corrosion detection and corrosion condition evaluation of offshore platform risers. The ultrasonic guided wave detection device is used to quickly locate the defect area of ​​the riser, the low-energy ray detection device is used to accurately detect the defect area of ​​the riser, and the riser detection fixing device is used to fix the low-energy ray detection device on the offshore platform riser, and can move radially and axially as needed, and the low-energy ray detection device can be fixed at a designated position to perform detection operations and detect the designated area.

[0027] like Figure 1 As shown, the ultrasonic guided wave detection equipment includes an array sensor 4 and a signal conditioning module 2 connected to each other through a signal line, the array sensor 4 is arranged along the outer circumference of the standpipe 3 to be inspected, and the signal conditioning module 2 is connected to a data acquisition and analysis module 1 of a computer system for data transmission and analysis through a data transmission line. Among them, the array sensor 4 is composed of a plurality of piezoelectric ceramic sensors arranged evenly on a circumference of a certain diameter, and the array sensor 4 uses a piezoelectric ceramic probe to transmit ultrasonic guided wave detection signals and receive echo signals.

[0028] like Figure 2 As shown, the standpipe detection and fixing device includes a steel fixing frame 5, on which a magnetic adsorption component 6, a radiation source fixing component 7, and a detector fixing component 8 are arranged. The steel fixing frame 5 is fixed to the outside of the standpipe 3 to be inspected by the magnetic adsorption component 6, and the radiation source fixing component 7 and the detector fixing component 8 are arranged on two opposite sides of the steel fixing frame 5. The steel fixing frame 5 is configured as two semicircular frame parts connected by a slipknot 9, and the cross-sectional shape of the steel fixing frame 5 is the same as that of the standpipe 3 to be inspected. During installation, one part is first put in place, and the magnetic adsorption component of this part is energized to generate magnetic force. This part is adsorbed on the wall of the standpipe 3 to be inspected by magnetic force, and then the other part is put in place, and the magnetic adsorption component 6 is also energized to generate magnetic force, and fixed on the wall of the standpipe 3 to be inspected. Finally, the slipknot 9 is connected to combine the two parts together to form a stable fixing condition. In addition, the standpipe detection and fixing device can also use an anti-fall rope as an accessory to play a fixing role.

[0029] The low-energy radiation detection device includes a radiation source and a detector. The radiation source is fixed on a radiation source fixing component 7, and the detector is fixed on a detector fixing component 8. The detector is connected to a data acquisition and analysis module 1 of a computer system via a signal line.

[0030] like Figure 3As shown, an ultrasonic guided wave detection device is installed on the upper part of the riser 3 to be inspected (generally located on the bottom deck of the platform). After the ultrasonic guided wave detection device is in place, the guided wave detection is started, and the relevant instructions are transmitted to the signal conditioning module 2 through the data acquisition and analysis module 1 of the computer system. The signal conditioning module 2 transmits the modulated detection signal to the array sensor 4. The array sensor 4 propagates the signal along the wall of the riser 3 to be inspected, and feeds back the signal to the array sensor 4 after encountering a defect. The array sensor 4 transmits the echo signal back to the signal conditioning module 2 for demodulation, and then feeds back to the data acquisition and analysis module. The analysis result is output in the computer system, so that the part with thinning of the wall thickness exceeding 10% can be quickly identified, the range of the defective area of ​​the riser can be determined, and rapid positioning can be achieved, thereby providing an installation position for the low-energy ray detection equipment.

[0031] After the low-energy ray detection equipment is installed, the ray detection is started, and its energy is controlled within the safe range for human body. The ray source emits X-rays vertically to the defective area of ​​the riser to be inspected. The X-rays pass through the riser to be inspected and are projected onto the signal receiving board of the detector, where they are converted into electrical signals and transmitted to the data collection and analysis module of the computer system. After analysis, the morphology and size of the defect in the riser to be inspected can be obtained. If there is corrosion, the thickness can be identified to be not less than 5mm, and the density difference of the layered material can be identified to be not more than 500kg / m 3 of corrosion products.

[0032] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific functions and working processes. The above-mentioned specific implementation methods are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. An offshore platform riser detection device, characterized in that: Including ultrasonic guided wave detection equipment, low energy ray detection equipment and standpipe detection fixtures; The ultrasonic guided wave detection device comprises an array sensor (4) and a signal conditioning module (2) which are interconnected via a signal line, the array sensor (4) being arranged along the outer circumference of the standpipe (3) to be inspected, and the signal conditioning module (2) being connected to a data acquisition and analysis module (1) of a computer system via a data transmission line; The standpipe inspection and fixing device comprises a steel fixing frame (5), on which a magnetic adsorption component (6), a radiation source fixing component (7), and a detector fixing component (8) are arranged, and the steel fixing frame (5) is fixed to the outside of the standpipe to be inspected (3) by means of the magnetic adsorption component (6), and the radiation source fixing component (7) and the detector fixing component (8) are arranged on two opposite sides of the steel fixing frame (5); The low-energy radiation detection device comprises a radiation source and a detector, wherein the radiation source is fixed on a radiation source fixing component (7), the detector is fixed on a detector fixing component (8), and the detector is connected to a data acquisition and analysis module (1) of a computer system via a signal line; An ultrasonic guided wave detection device is installed on the upper part of the riser (3) to be inspected. After the ultrasonic guided wave detection device is in place, the guided wave detection is started. The data acquisition and analysis module (1) of the computer system transmits relevant instructions to the signal conditioning module (2). The signal conditioning module (2) transmits the modulated detection signal to the array sensor (4). The array sensor (4) propagates the signal along the wall of the riser (3) to be inspected. After encountering a defect, the signal is fed back to the array sensor (4). The array sensor (4) transmits the echo signal back to the signal conditioning module for demodulation and then feeds it back to the data acquisition and analysis module (1). The analysis result is output in the computer system, so that the defect area range of the riser to be inspected can be determined.

2. The offshore platform riser detection device according to claim 1, characterized in that: The steel fixing frame (5) is configured as two semicircular frame parts connected by a slipknot, and the cross-sectional shape of the steel fixing frame (5) is the same as the shape of the standpipe to be inspected. During installation, one part is first put in place, and the magnetic adsorption component (6) of the part is energized to generate magnetic force, and the part is adsorbed on the wall of the standpipe to be inspected (3) by magnetic force. Then, the other part is put in place, and the magnetic adsorption component (6) is also energized to generate magnetic force, and fixed on the wall of the standpipe to be inspected (3). Finally, the slipknot (9) is connected to combine the two parts together to form a stable fixing condition.

3. The offshore platform riser detection device according to claim 1, characterized in that: After the low-energy ray detection equipment is installed, the ray detection is started. The ray source emits X-rays vertically to the defective area of ​​the riser to be inspected. The X-rays pass through the riser to be inspected and are projected onto the detector, converted into electrical signals, and transmitted to the data collection and analysis module of the computer system. After analysis, the morphology and size of the defect in the riser to be inspected are obtained.

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