Flexible riser monitoring device

Abstract

The utility model relates to a flexible riser monitoring device which comprises a flexible riser, a first valve, a gas-liquid separator, a gas component monitor, a first pressure sensor, a temperature sensor and a liquid collector, the flexible vertical pipe comprises an annular hollow layer; an exhaust hole of the annulus layer is communicated with an inlet of the first valve, and an outlet of the gas component monitor is communicated with the atmospheric environment; the first pressure sensor and the temperature sensor are arranged between the flexible vertical pipe and the first valve in parallel, and the first pressure sensor is used for detecting the pressure of an annular space layer; the liquid collector is communicated with a liquid outlet of the gas-liquid separator, and an inlet of the gas component monitor is communicated with a gas outlet of the gas-liquid separator. According to the utility model, the gas-liquid separator is arranged between the first valve and the gas component monitor, and the separated liquid is stored through the liquid collector, so that the liquid can be further detected, the monitoring precision can be improved, the service life of the gas component monitor can be prolonged, and the regular inspection of the liquid can be realized.

Description

Technical Field

[0001] The utility model relates to an oil and gas exploitation monitoring device, in particular to a flexible riser monitoring device. Background Art

[0002] The methods of offshore oil and gas production are roughly the same as those on land, but flexible riser transportation measures are required. The production project generally varies according to the natural and geological conditions of the oil and gas field. In the shallow water area near the coast with a water depth of less than 12 meters, it is more economical to develop artificial islands. Drill oil wells on the island, build oil gathering and oil pumping stations, lay submarine pipelines, and transport oil and gas to land. In the sea area with slightly deeper water, fixed oil and gas production platforms are built; floating oil and gas production platforms are often used in water depths of more than 300 meters. After the oil wells on the platform produce oil and gas, the oil and gas are collected through oil and gas pipelines, and then transported to land or transported by tankers through oil and gas pipelines. Flexible risers are connecting pipelines from the submarine oil and gas inlet to the oil and gas gathering station. They are used to suck up oil and gas from the seabed and are an important part of offshore oil and gas field development.

[0003] Flexible risers operate underwater all year round. They need to withstand the pressure of hundreds of meters of water depth, withstand the corrosion of seawater, and prevent fatigue damage caused by the impact of seabed waves. Once the flexible riser is externally damaged, the internal air pressure is too high and the outer sheath is broken, or the internal corrosion occurs, it will cause oil and gas leakage, which will not only greatly affect the production of the oil field, but also may cause irreversible adverse effects on the environment. Therefore, daily inspection and maintenance of flexible risers is a very important task. Since flexible risers operate underwater all year round, daily inspection and maintenance are difficult to reach. Once there is a problem with the flexible riser, it is basically necessary to stop production for repair or replace it with a new pipe, which seriously affects the production and operation of the oil field and brings huge safety hazards and economic losses. Utility Model Content

[0004] The purpose of the utility model is to provide a flexible riser monitoring device and method in order to overcome the defects of the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A flexible riser monitoring device, comprising:

[0007] a flexible riser, the flexible riser comprising an annulus layer;

[0008] A first valve, a gas-liquid separator and a gas composition monitor are connected in sequence, the exhaust hole of the annulus layer is connected to the inlet of the first valve, and the outlet of the gas composition monitor is connected to the atmospheric environment;

[0009] a first pressure sensor and a temperature sensor, wherein the first pressure sensor and the temperature sensor are arranged in parallel between the flexible riser and the first valve, and the first pressure sensor is used to detect the pressure of the annulus layer;

[0010] A liquid collector is connected to the liquid outlet of the gas-liquid separator, and an inlet of the gas component monitor is connected to the gas outlet of the gas-liquid separator.

[0011] In one embodiment, the device further includes a second valve and a gas collector, the second valve is arranged between the gas-liquid separator and the gas component monitor, the second valve is a three-way valve, and the gas collector is connected to the second valve.

[0012] In one embodiment, the device further comprises a flow sensor, and the flow sensor is arranged between the gas-liquid separator and the gas composition monitor.

[0013] In one embodiment, the device includes a controller, the first valve is a solenoid valve, and the controller is electrically connected to the first valve, the gas-liquid separator, the gas composition monitor, the first pressure sensor, the temperature sensor and the flow sensor.

[0014] In one of the embodiments, the device comprises an explosion-proof box, and the first valve, the gas-liquid separator and the gas composition monitor, the first pressure sensor and the temperature sensor and the liquid collector are all arranged in the explosion-proof box.

[0015] In one embodiment, the first valve is a three-way valve, and the device also includes an inflation assembly, which includes a nitrogen bottle, a regulating valve and a third valve connected in sequence, an outlet of the third valve is connected to the first valve, and a second pressure sensor is provided on the regulating valve, and the second pressure sensor is used to detect the pressure of the nitrogen bottle.

[0016] In one embodiment, a pressure relief valve is provided between the third valve and the first valve, and a pressure relief threshold of the pressure relief valve is 3.5 bar.

[0017] In one embodiment, a fourth valve is provided between the regulating valve and the third valve, and a third pressure sensor is provided between the fourth valve and the third valve.

[0018] In one of the embodiments, the device further comprises an alarm, wherein the alarm is electrically connected to the first pressure sensor, and the alarm is used to warn of detection abnormality of the first pressure sensor.

[0019] In one embodiment, the gas composition monitor includes a CO2 Sensor, H 2 S sensor, CH 4 Sensor, H 2 O sensor, CO sensor and O 2 sensor.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] 1. The flexible riser monitoring device is connected to a first pressure sensor, a temperature sensor and a gas composition monitor in sequence behind the annulus exhaust hole of the flexible riser, so as to monitor the air pressure in the annulus layer, the temperature and components of the gas in real time, and monitor the state of the annulus layer; since a first valve is provided before the gas composition monitor, whether the gas enters the gas composition monitor can be controlled by the first valve. When the first valve is closed, the flexible riser monitoring device only monitors the air pressure and air temperature of the annulus layer. When the first valve is opened, the gas in the annulus layer enters the gas composition monitor for component and concentration analysis and detection; in order to prevent the liquid contained in the gas in the annulus layer from affecting the accuracy of gas composition monitoring, a gas-liquid separator is provided between the first valve and the gas composition monitor, and the liquid in the gas is separated before entering the gas composition monitor. At the same time, the separated liquid is stored through a liquid collector, so as to facilitate further detection of the liquid, which is conducive to improving the monitoring accuracy, extending the service life of the gas composition monitor, and realizing regular inspection of the liquid.

[0022] 2. The device further sets a second valve and a gas collector between the gas-liquid separator and the gas component monitor, so that the second valve can control the direction of the gas. If the gas component needs to be monitored in real time, the second valve is controlled to connect the gas-liquid separator and the gas component monitor. When the gas needs to be collected for precise laboratory testing, the second valve is controlled to switch to the gas collector. Therefore, this structure realizes real-time monitoring and precise detection, which is conducive to in-depth analysis of the gas component and in-depth monitoring of the state of the annulus layer.

[0023] 3. Since a flow sensor is provided between the gas-liquid separator and the gas component monitor, the flow rate of the gas released from the annulus layer can be monitored in real time, and the exhaust volume of the annulus layer within a period of time can be calculated.

[0024] 4. The monitoring instruments and valves of the device are all installed in an explosion-proof box to prevent explosions caused by excessive air pressure in the annulus layer or accidents caused by gas leakage, which is beneficial to improving the safety of monitoring.

[0025] 5. The nitrogen cylinder, the regulating valve and the third valve can be used to inflate the annulus layer, thereby obtaining the remaining volume of the annulus layer. During the inflation process, since a pressure relief valve is provided between the third valve and the first valve, when the gas pressure in the nitrogen cylinder is too high, that is, when the gas pressure is greater than 3.5 bar, the pressure relief valve automatically opens to discharge the gas, thereby preventing the annulus layer and other valves from being damaged by excessive gas pressure.

[0026] 6. The fourth valve and the third pressure sensor provide further safety assurance for the inflation process. During the inflation process, after the regulating valve adjusts the air pressure of the nitrogen bottle, the fourth valve is opened first, and the third pressure sensor detects the air pressure. After the air pressure meets the requirements, the third valve is opened to effectively prevent the nitrogen from being filled with excessive pressure and protect the subsequent pipeline and annulus layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the flexible riser monitoring device in the utility model.

[0028] Figure 2 This is a control connection diagram of the flexible riser monitoring device in the utility model.

[0029] Figure numerals: 100, flexible riser monitoring device; 10, flexible riser; 11, first pressure sensor; 12, temperature sensor; 20, first valve; 30, gas-liquid separator; 31, liquid collector; 32, second valve; 33, gas collector; 40, gas component monitor; 50, flow sensor; 60, nitrogen bottle; 61, regulating valve; 62, third valve; 63, second pressure sensor; 64, pressure relief valve; 65, fourth valve; 66, third pressure sensor; 70, explosion-proof box. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0031] Some implementations of a flexible riser monitoring device 100 are described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, in one embodiment, a flexible riser monitoring device 100 is provided, comprising a flexible riser 10, a first valve 20, a gas-liquid separator 30, a gas component monitor 40, a first pressure sensor 11, a temperature sensor 12 and a liquid collector 31;

[0033] Among them, the flexible riser 10 includes an annulus layer; the first valve 20, the gas-liquid separator 30 and the gas component monitor 40 are connected in sequence, the exhaust hole of the annulus layer is connected to the inlet of the first valve 20, and the outlet of the gas component monitor 40 is connected to the atmospheric environment; the first pressure sensor 11 and the temperature sensor 12 are arranged in parallel between the flexible riser 10 and the first valve 20, and the first pressure sensor 11 is used to detect the pressure of the annulus layer; the liquid collector 31 is connected to the liquid outlet of the gas-liquid separator 30, and the inlet of the gas component monitor 40 is connected to the gas outlet of the gas-liquid separator 30.

[0034] The flexible riser monitoring device 100 is connected to the first pressure sensor 11, the temperature sensor 12 and the gas composition monitor 40 in sequence behind the annular layer exhaust hole of the flexible riser 10, so as to monitor the gas pressure in the annular layer, the temperature and composition of the gas in real time, and monitor the state of the annular layer; because the first valve 20 is provided before the gas composition monitor 40, whether the gas enters the gas composition monitor 40 can be controlled by the first valve 20. When the first valve 20 is closed, the flexible riser monitoring device 100 only monitors the gas pressure and temperature of the annular layer. When the first valve 20 is closed, the flexible riser monitoring device 100 only monitors the gas pressure and temperature of the annular layer. When the valve 20 is opened, the gas in the annulus layer enters the gas composition monitor 40 for component and concentration analysis and detection; in order to prevent the liquid contained in the gas in the annulus layer from affecting the accuracy of gas composition monitoring, a gas-liquid separator 30 is arranged between the first valve 20 and the gas composition monitor 40 to separate the liquid in the gas before entering the gas composition monitor 40. At the same time, the separated liquid is stored in the liquid collector 31 to facilitate further detection of the liquid, which is beneficial to improve the monitoring accuracy, extend the service life of the gas composition monitor 40, and realize regular inspection of the liquid.

[0035] Specifically, Figure 1 As shown, in one embodiment, the device further includes a second valve 32 and a gas collector 33, the second valve 32 is disposed between the gas-liquid separator 30 and the gas component monitor 40, the second valve 32 is a three-way valve, and the gas collector 33 is connected to the second valve 32. The device further provides a second valve 32 and a gas collector 33 between the gas-liquid separator 30 and the gas component monitor 40, so that the second valve 32 can control the direction of the gas, if the gas component needs to be monitored in real time, the second valve 32 is controlled to connect the gas-liquid separator 30 and the gas component monitor 40, and when the gas needs to be collected for precise laboratory testing, the second valve 32 is controlled to switch to the gas collector 33, so that the structure realizes real-time monitoring and precise testing, which is conducive to in-depth analysis of the gas component and in-depth monitoring of the state of the annulus layer.

[0036] Furthermore, if Figure 1As shown, in one embodiment, the device further includes a flow sensor 50, which is disposed between the gas-liquid separator 30 and the gas component monitor 40. Since the flow sensor 50 is disposed between the gas-liquid separator 30 and the gas component monitor 40, the flow rate of the gas released from the annular layer can be monitored in real time, and the exhaust volume of the annular layer within a period of time can be calculated.

[0037] Specifically, Figure 2 As shown, in one embodiment, the device includes a controller, the first valve 20 is a solenoid valve, and the controller is electrically connected to the first valve 20, the gas-liquid separator 30, the gas component monitor 40, the first pressure sensor 11, the temperature sensor 12 and the flow sensor 50.

[0038] In this specific embodiment, the first valve 20, the second valve 32, the third valve 62, the fourth valve 65, the pressure relief valve 64, and the regulating valve 61 are all solenoid valves, which are electrically connected to the controller for controlling the opening and closing of the valves and the lowering and raising of the pressure regulating valves. At the same time, the controller is also electrically connected to the first pressure sensor 11, the second pressure sensor 63, the third pressure sensor 66, the temperature sensor 12, the flow sensor 50 and the gas composition monitor 40 for recording and displaying the test results.

[0039] Specifically, Figure 1 As shown, in one embodiment, the device includes an explosion-proof box 70, and the first valve 20, the gas-liquid separator 30, the gas component monitor 40, the first pressure sensor 11, the temperature sensor 12 and the liquid collector 31 are all arranged in the explosion-proof box 70. The monitoring instruments and valves of the device are all arranged in the explosion-proof box 70 to prevent explosions caused by excessive annular layer pressure or accidents caused by gas leakage, which is conducive to improving the safety of monitoring.

[0040] Specifically, Figure 1 As shown, in one embodiment, the first valve 20 is a three-way valve, and the device also includes an inflation assembly, which includes a nitrogen bottle 60, a regulating valve 61 and a third valve 62 connected in sequence, and the outlet of the third valve 62 is connected to the first valve 20. The regulating valve 61 is provided with a second pressure sensor 63, and the second pressure sensor 63 is used to detect the pressure of the nitrogen bottle 60.

[0041] Furthermore, if Figure 1As shown, in one embodiment, a pressure relief valve 64 is provided between the third valve 62 and the first valve 20, and the pressure relief threshold of the pressure relief valve 64 is 3.5 bar. The nitrogen bottle 60, the regulating valve 61 and the third valve 62 can realize the inflation into the annular layer, so as to obtain the residual volume of the annular layer. During the inflation process, since the pressure relief valve 64 is provided between the third valve 62 and the first valve 20, when the air pressure of the nitrogen bottle 60 is too high, that is, when the air pressure is greater than 3.5 bar, the pressure relief valve 64 automatically opens and empties, so as to avoid damage to the annular layer and other valves due to excessive air pressure.

[0042] In addition, a fourth valve 65 is provided between the regulating valve 61 and the third valve 62, and a third pressure sensor 66 is provided between the fourth valve 65 and the third valve 62. The fourth valve 65 and the third pressure sensor 66 provide further safety guarantee for the inflation process. During the inflation process, after the regulating valve 61 adjusts the air pressure of the nitrogen bottle 60, the fourth valve 65 is opened first, and the third pressure sensor 66 detects the air pressure. After the air pressure meets the requirements, the third valve 62 is opened, which effectively prevents the nitrogen from being filled with excessive pressure and protects the subsequent pipeline and annulus layer.

[0043] Specifically, in one embodiment, the device further includes an alarm, which is electrically connected to the first pressure sensor 11 , and is used to warn of detection abnormality of the first pressure sensor 11 .

[0044] Specifically, in one embodiment, the gas composition monitor 40 includes a CO 2 Sensor, H 2 S sensor, CH 4 Sensor, H 2 O sensor, CO sensor and O 2 sensor.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0050] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A flexible riser monitoring device, characterized in that: include: A flexible riser (10), the flexible riser (10) comprising an annulus layer; A first valve (20), a gas-liquid separator (30) and a gas composition monitor (40) are sequentially connected, the exhaust hole of the annulus layer is connected to the inlet of the first valve (20), and the outlet of the gas composition monitor (40) is connected to the atmospheric environment; a first pressure sensor (11) and a temperature sensor (12), wherein the first pressure sensor (11) and the temperature sensor (12) are arranged in parallel between the flexible riser (10) and the first valve (20), and the first pressure sensor (11) is used to detect the pressure of the annulus layer; A liquid collector (31), wherein the liquid collector (31) is connected to the liquid outlet of the gas-liquid separator (30), and the inlet of the gas component monitor (40) is connected to the gas outlet of the gas-liquid separator (30).

2. A flexible riser monitoring device according to claim 1, characterized in that: The device further comprises a second valve (32) and a gas collector (33); the second valve (32) is arranged between the gas-liquid separator (30) and the gas component monitor (40); the second valve (32) is a three-way valve; and the gas collector (33) is connected to the second valve (32).

3. A flexible riser monitoring device according to claim 1, characterized in that: The device further comprises a flow sensor (50), wherein the flow sensor (50) is arranged between the gas-liquid separator (30) and the gas component monitor (40).

4. A flexible riser monitoring device according to claim 3, characterized in that: The device comprises a controller, wherein the first valve (20) is a solenoid valve, and the controller is electrically connected to the first valve (20), the gas-liquid separator (30), the gas component monitor (40), the first pressure sensor (11), the temperature sensor (12) and the flow sensor (50).

5. A flexible riser monitoring device according to claim 3, characterized in that: The device comprises an explosion-proof box (70), wherein the first valve (20), the gas-liquid separator (30), the gas component monitor (40), the first pressure sensor (11), the temperature sensor (12) and the liquid collector (31) are all arranged in the explosion-proof box (70).

6. A flexible riser monitoring device according to claim 1, characterized in that: The first valve (20) is a three-way valve. The device further comprises an inflation assembly, wherein the inflation assembly comprises a nitrogen bottle (60), a regulating valve (61) and a third valve (62) which are connected in sequence. The outlet of the third valve (62) is connected to the first valve (20). The regulating valve (61) is provided with a second pressure sensor (63), and the second pressure sensor (63) is used to detect the pressure of the nitrogen bottle (60).

7. A flexible riser monitoring device according to claim 6, characterized in that: A pressure relief valve (64) is provided between the third valve (62) and the first valve (20), and a pressure relief threshold of the pressure relief valve (64) is 3.5 bar.

8. A flexible riser monitoring device according to claim 6, characterized in that: A fourth valve (65) is provided between the regulating valve (61) and the third valve (62), and a third pressure sensor (66) is provided between the fourth valve (65) and the third valve (62).

9. A flexible riser monitoring device according to claim 1, characterized in that: The device further comprises an alarm, which is electrically connected to the first pressure sensor (11), and is used to warn of detection abnormality of the first pressure sensor (11).

10. A flexible riser monitoring device according to claim 1, characterized in that: The gas component monitor (40) comprises a CO2 sensor, a H2S sensor, a CH4 sensor, a H2O sensor, a CO sensor and an O2 sensor.

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