Deepwater gas transmission pipeline hydrate blocking self-circulation rapid blocking removal equipment and blocking removal method

Abstract

The invention relates to a self-circulation rapid blocking removal device and method for hydrate blocking of a deepwater gas transmission pipeline. Comprising an inhalation inhibitor storage cavity, a composite inhibitor storage cavity, a methanol storage cavity and a methane storage cavity which are sequentially connected, a rotary nozzle is arranged on the side surface of the inhaled inhibitor storage cavity, and an inhibitor inhaling pipeline is arranged at the bottom; a methane-to-methanol reaction cavity is arranged in the methane storage cavity, and the rear end of the methane storage cavity is connected with a power supply device. According to the self-circulation rapid blocking removal equipment for hydrate blocking of the deepwater gas transmission pipeline, self-circulation of composite inhibitor injection, hydrate decomposition, methane suction, methanol preparation and inhibitor supplementation is formed, and the safety problem of pressure control in the pipeline is effectively solved. In addition, in-situ preparation of the composite inhibitor can be achieved through self-circulation, the composite inhibitor raw materials do not need to be supplemented repeatedly in the using process, meanwhile, the concentration of the composite inhibitor can be increased, the blocking removal efficiency is further improved, the blocking removal time is shortened, and the blocking removal cost is reduced.

Description

Technical Field

[0001] The present invention relates to a self - circulating rapid plug - removal device and method for hydrate blockage in deep - water gas pipelines, belonging to the technical field of natural gas hydrate flow assurance in sea areas. Background Technique

[0002] Deep - water gas pipelines are in a high - pressure and low - temperature environment, and hydrates are extremely likely to form inside the pipelines. When there are omissions in hydrate prevention and control measures, hydrate blockages will occur inside the pipelines, leading to production stoppages. The duration of production stoppages determines the size of economic losses. Therefore, safe and rapid plug - removal is crucial for reducing economic losses.

[0003] Currently, when blockages occur in deep - water gas pipelines, the main hydrate plug - removal method is to inject a large amount of thermodynamic inhibitors (such as methanol and ethylene glycol), allowing the inhibitors to flow to the blockage location and self - perform plug - removal, and achieving pressure reduction at the plug - removal end through external pipelines and other means. However, this method cannot effectively control the flow and action efficiency of the inhibitors. Therefore, it takes more than ten days to remove the blockage in a pipeline blockage area of dozens of meters, and the plug - removal efficiency is relatively low. On the one hand, because the decomposition rate is too fast, it is easy to cause the pressure in the pipeline at the hydrate decomposition end to rise rapidly during the plug - removal process, and even lead to safety accidents such as pipeline bursts. On the other hand, because the injected inhibitors are not evenly distributed in the blockage section, but accumulate at the lower part of the pipeline under the influence of the pipeline undulation state and gravity factors, thus reducing the plug - removal efficiency. In addition, plug - removal methods such as pressure reduction and heating are difficult to control the pressure reduction and heating rates, and external pipelines need to be connected to the blockage section of the pipeline to achieve effective pressure reduction. The plug - removal efficiency and safety of these methods are both relatively low.

[0004] Therefore, the efficiency of the current hydrate blockage plug - removal methods used on - site is severely limited, and there is a lack of a safe and rapid plug - removal method for hydrate blockages in deep - water gas pipelines. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a self - circulating rapid plug - removal device and method for hydrate blockage in deep - water gas pipelines. This device can effectively control the pressure in the pipeline at the hydrate decomposition end during the plug - removal process. At the same time, it can make the inhibitor act on the entire blockage cross - section and further increase the inhibitor concentration by self - circulating to prepare methanol inhibitor. In addition, the reaction heat generated during the self - circulating preparation of methanol can supplement the heat of hydrate decomposition, thereby achieving the purpose of safe and rapid plug - removal.

[0006] The technical solution of the present invention is as follows:

[0007] A self - circulating rapid plug - removal device for hydrate blockage in deep - water gas pipelines includes an inhaled inhibitor storage chamber, a composite inhibitor storage chamber, a methanol storage chamber, and a methane storage chamber that are connected in sequence;

[0008] A rotary nozzle is provided on the side of the inhalation inhibitor storage chamber, and an inhibitor inhalation pipeline is provided at the bottom.

[0009] A methane-to-methanol reaction chamber is provided in the methane storage chamber, and a power supply device is connected to the rear end.

[0010] Preferably according to the present invention, the deep-water gas pipeline hydrate blockage self-circulation rapid deblocking device is cylindrical as a whole, with a length of 1.4 - 1.6 m and a diameter of 80 - 85% of the diameter of the pipeline to be deblocked, and the material is titanium alloy.

[0011] Preferably according to the present invention, the inhalation inhibitor storage chamber, the composite inhibitor storage chamber, the methanol storage chamber, and the methane storage chamber are connected by a communication valve.

[0012] Preferably according to the present invention, the inhalation inhibitor storage chamber has a length of 18 - 22 cm, the composite inhibitor storage chamber has a length of 28 - 32 cm, the methanol storage chamber has a length of 48 - 52 cm, and the methane storage chamber has a length of 48 - 52 cm.

[0013] More preferably, the inhalation inhibitor storage chamber has a length of 20 cm, the composite inhibitor storage chamber has a length of 30 cm, the methanol storage chamber has a length of 50 cm, and the methane storage chamber has a length of 50 cm.

[0014] Preferably according to the present invention, the inhalation inhibitor storage chamber is filled with a composite inhibitor; the methane storage chamber is filled with a carbon tetrachloride solution; the composite inhibitor storage chamber is filled with ethylene glycol; the methanol storage chamber is filled with methanol. The composite inhibitor is a mixture of methanol and ethylene glycol.

[0015] Preferably according to the present invention, a first liquid level detection sensor is provided at the top of the inhalation inhibitor storage chamber, a second liquid level detection sensor is provided at the top of the composite inhibitor storage chamber, and a pipeline pressure detection sensor is provided at the top of the methanol storage chamber.

[0016] Preferably according to the present invention, the methane-to-methanol reaction chamber occupies 50% of the volume of the methane storage chamber and is filled with AuPd / ZSM-5-C16 catalyst and hydrogen peroxide.

[0017] Preferably according to the present invention, the methane-to-methanol reaction chamber has a gas suction port at the top and a gas discharge port at the bottom. The gas suction port and the gas discharge port extend out of the methane storage chamber and can inhale or discharge gas from the outside.

[0018] Preferably according to the present invention, the power supply device provides power for the spraying of the rotary nozzle and the movement of the entire device, and an acoustic wave detection system and a displacement sensor are arranged inside. The acoustic wave detection system can obtain the distance between the device and the hydrate blockage section, and the displacement sensor can control the forward movement distance of the device.

[0019] A method for quickly unblocking a hydrate blockage in a deep-water gas pipeline using the above-mentioned self-circulating and quickly unblocking device for hydrate blockage in a deep-water gas pipeline includes the following steps:

[0020] (1) Lower the self-circulating and quickly unblocking device for hydrate blockage in a deep-water gas pipeline to the hydrate blockage position of the pipeline to be unblocked through the power supply device, and then rotate and spray the composite inhibitor inhaled into the inhibitor storage cavity onto the blocked hydrate through the rotary nozzle;

[0021] (2) The blocked hydrate begins to decompose under the action of the inhibitor, generating methane gas, resulting in an increase in the pressure of the pipeline to be unblocked. The pressure of the pipeline to be unblocked is monitored in real time through the pipeline pressure monitoring sensor. If it is higher than the set pressure (the set pressure usually equals the initial pressure of the pipeline), the gas suction port will automatically absorb external methane gas into the methane storage cavity, thereby reducing the pipeline pressure to the set pressure;

[0022] (3) After the second liquid level monitoring sensor monitors that the liquid level in the composite inhibitor storage cavity is lower than the set value, open the connecting valve to supply the methanol in the methanol storage cavity to the composite inhibitor storage cavity to form a composite inhibitor, and stop supplying when the liquid level reaches the set value H2;

[0023] When the first liquid level monitoring sensor monitors that the liquid level in the inhaled inhibitor storage cavity is lower than the set value H1, it will automatically open the connecting valve to supply the composite inhibitor in the composite inhibitor storage cavity to the inhaled inhibitor storage cavity, and stop supplying when the liquid level reaches the set value H2;

[0024] (4) Repeat steps (1) to (3) repeatedly to form a self-circulation until the hydrate blockage in the pipeline to be unblocked is solved.

[0025] Preferably according to the present invention, in step (1), after the rotary spraying, the composite inhibitor will accumulate at the lower part of the pipeline due to gravity, and it is recycled to the inhaled inhibitor storage cavity through the inhibitor suction pipeline for recycling.

[0026] Preferably according to the present invention, in step (2), after the external methane gas enters the methane storage chamber, a part of the methane will enter the methane-to-methanol reaction chamber, and methanol is prepared through a reaction using methane as a raw material. Another part of the methane will dissolve in the carbon tetrachloride solution in the methane storage chamber; when the methane concentration in the methane-to-methanol reaction chamber is lower than the methane concentration in the carbon tetrachloride solution, the methane in the carbon tetrachloride solution will spontaneously enter the methane-to-methanol reaction chamber for supply and replenishment.

[0027] More preferably, the methane gas released by the decomposition of the hydrate blockage section is captured through a built-in porous sieve in the methane-to-methanol reaction chamber, and the reaction of methane with hydrogen peroxide is catalyzed by the AuPd / ZSM-5-C16 catalyst (hydrophobically modified zeolite-supported bimetallic nanoparticles) to produce methanol; at the same time, the heat released by the reaction (ΔH≈-126kJ / mol) is used to supplement the heat required for hydrate decomposition, and the prepared methanol can be stored in the methanol storage chamber through a connecting valve for recycling;

[0028] The specific reaction formula is:

[0029] Preferably according to the present invention, in step (3), H1 is 20-30% of the diameter of the deep-water gas pipeline hydrate blockage self-circulation rapid blockage removal device, and H2 is 70-80% of the diameter of the deep-water gas pipeline hydrate blockage self-circulation rapid blockage removal device.

[0030] The technical features of the present invention:

[0031] There are two self-circulations in the deep-water gas pipeline hydrate blockage self-circulation rapid blockage removal device provided by the present invention.

[0032] The first self-circulation is: the self-circulation of the rotary injection - inhalation - re-injection of the composite inhibitor at the front end of the device.

[0033] The second self-circulation is: the self-circulation of the composite inhibitor injection - hydrate decomposition - methane inhalation - methanol preparation - inhibitor replenishment.

[0034] The process of the second self-circulation is as Figure 1 shown, specifically: the injection of the composite inhibitor in the pipeline causes the decomposition of the hydrate blockage cross-section to generate methane. Methane is controlled to be inhaled as a raw material for methanol preparation in the reaction chamber, and at the same time, the pressure in the pipeline can be regulated to prevent a large amount of methane gas generated by the rapid decomposition of the hydrate from causing a pressure increase and leading to pipeline burst. The prepared methanol can be supplemented to the methanol storage chamber as a hydrate decomposition inhibitor for supply, and subsequently, the hydrate at the blockage position is continuously decomposed through rotary injection. In addition, the heat generated during the reaction can supplement the heat required for hydrate decomposition.

[0035] The beneficial effects of the present invention:

[0036] 1. The self - circulating rapid plug - removal equipment for hydrate blockage in deep - water gas pipelines provided by the present invention forms a self - circulation of front - end compound inhibitor rotary injection - inhalation - re - injection, effectively improving the efficiency and utilization rate of the compound inhibitor in decomposing hydrates, enhancing the plug - removal efficiency, avoiding the over - use of the compound inhibitor, and reducing the plug - removal cost.

[0037] 2. The self - circulating rapid plug - removal equipment for hydrate blockage in deep - water gas pipelines provided by the present invention forms a self - circulation of compound inhibitor injection - hydrate decomposition - methane inhalation - methanol preparation - inhibitor supplementation, effectively solving the safety problem of pipeline internal pressure control. And this self - circulation can realize the in - situ preparation of the compound inhibitor, without the need to repeatedly supplement the compound inhibitor raw materials during use. At the same time, it can also increase the concentration of the compound inhibitor, further improve the plug - removal efficiency, shorten the plug - removal time, and reduce the plug - removal cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the self - circulation of each reagent when the self - circulating rapid plug - removal equipment for hydrate blockage in deep - water gas pipelines of the present invention is in use.

[0039] Figure 2 It is a schematic structural diagram of the self - circulating rapid plug - removal equipment for hydrate blockage in deep - water gas pipelines of the present invention;

[0040] In the figure: 1 - inhibitor inhalation pipeline, 2 - rotary nozzle, 3 - compound inhibitor storage chamber, 4 - connecting valve, 5 - methanol storage chamber, 6 - pipeline pressure monitoring sensor, 7 - methane storage chamber, 8 - methane - to - methanol reaction chamber, 9 - power supply device, 10 - gas suction port, 11 - second liquid level monitoring sensor, 12 - inhaled inhibitor storage chamber, 13 - gas discharge port, 14 - first liquid level monitoring sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment 1

[0043] As Figure 2As shown in the figure, a self-circulating rapid plugging removal device for hydrate blockage in a deep-water gas pipeline. The overall device is cylindrical, with a length of 1.5 m and a diameter of 5 / 6 of the diameter of the pipeline to be unblocked. It is made of titanium alloy and includes an inhalation inhibitor storage chamber 12, a composite inhibitor storage chamber 3, a methanol storage chamber 5, and a methane storage chamber 7 connected in sequence;

[0044] A rotary nozzle 2 is provided on the side of the inhalation inhibitor storage chamber 12, and an inhibitor inhalation pipeline 1 is provided at the bottom;

[0045] A methane-to-methanol reaction chamber 8 is provided in the methane storage chamber 7, and a power supply device 9 is connected to the rear end.

[0046] The inhalation inhibitor storage chamber 12, the composite inhibitor storage chamber 3, the methanol storage chamber 5, and the methane storage chamber 7 are connected by a communication valve 4. Among them, the length of the inhalation inhibitor storage chamber 12 is 20 cm, the length of the composite inhibitor storage chamber 3 is 30 cm, the length of the methanol storage chamber 5 is 50 cm, and the length of the methane storage chamber 7 is 50 cm.

[0047] The inhalation inhibitor storage chamber 12 is filled with a composite inhibitor; the methane storage chamber 7 is filled with a carbon tetrachloride solution; the composite inhibitor storage chamber 3 is filled with ethylene glycol; the methanol storage chamber 5 is filled with methanol. Among them, the composite inhibitor is a mixture of methanol and ethylene glycol.

[0048] A first liquid level detection sensor 14 is provided at the top of the inhalation inhibitor storage chamber 12, a second liquid level detection sensor 11 is provided at the top of the composite inhibitor storage chamber 3, and a pipeline pressure detection sensor 6 is provided at the top of the methanol storage chamber 5.

[0049] The methane-to-methanol reaction chamber 8 has a gas suction port 10 at the top and a gas discharge port 13 at the bottom. The gas suction port 10 and the gas discharge port 13 extend out of the methane storage chamber 7 and can inhale or discharge gas from the outside. The methane-to-methanol reaction chamber 8 occupies 50% of the volume of the methane storage chamber and is filled with AuPd / ZSM-5-C16 catalyst and hydrogen peroxide, which can catalyze the reaction of methane with hydrogen peroxide to generate methanol.

[0050] The power supply device 9 provides power for the spraying of the rotary nozzle 2 and the movement of the entire device. An acoustic wave detection system and a displacement sensor are provided inside. The acoustic wave detection system can obtain the distance between the device and the hydrate blockage cross-section, and the displacement sensor can control the forward movement distance of the device.

[0051] Example 2

[0052] A method for rapidly removing blockage using the self-circulating rapid plugging removal device for hydrate blockage in a deep-water gas pipeline described in Example 1 includes the following steps:

[0053] (1) Lower the hydrate blockage self - circulation rapid plug - removal equipment for deep - water gas pipelines into the hydrate blockage position of the pipeline to be unblocked through the power supply device 9, and then rotate - spray the composite inhibitor inhaled into the inhibitor storage cavity 12 onto the blocked hydrate through the rotary nozzle 2;

[0054] After the rotary spraying, due to the action of gravity, the composite inhibitor will accumulate at the lower part of the pipeline. It can be recycled by being recovered into the inhibitor inhalation cavity 12 again through the inhibitor inhalation pipeline 1;

[0055] (2) The blocked hydrate begins to decompose under the action of the composite inhibitor, generating methane gas, which causes the pressure of the pipeline to be unblocked to rise. The pressure of the pipeline to be unblocked is monitored in real - time by the pipeline pressure monitoring sensor 6. If it is higher than the set pressure (the set pressure is usually equal to the initial pressure of the pipeline), the gas suction port 10 will automatically absorb the external methane gas into the methane storage cavity 7, thereby reducing the pipeline pressure to the set pressure;

[0056] After the external methane gas enters the methane storage cavity 7, a part of the methane will enter the methane - to - methanol reaction cavity 8, and methanol is prepared through a reaction with methane as the raw material. Another part of the methane will dissolve in the carbon tetrachloride solution in the methane storage cavity 7; when the methane concentration in the methane - to - methanol reaction cavity 8 is lower than that in the carbon tetrachloride solution, the methane in the carbon tetrachloride solution will spontaneously enter the methane - to - methanol reaction cavity 8 for supply and replenishment;

[0057] Specifically, the methane - to - methanol reaction cavity 8 captures the methane gas released by the decomposition of the hydrate blockage section through the built - in porous sieve, and uses the AuPd / ZSM - 5 - C16 catalyst (hydrophobic - modified zeolite - supported bimetallic nanoparticles) to catalyze the reaction of methane with hydrogen peroxide to generate methanol; at the same time, the heat released by the reaction (ΔH≈ - 126kJ / mol) is used to supplement the heat required for hydrate decomposition, and the prepared methanol can be stored in the methanol storage cavity 5 through the connecting valve 4 for recycling;

[0058] The reaction formula is:

[0059] (3) When the second liquid - level monitoring sensor 11 monitors that the liquid level in the composite inhibitor storage cavity 3 is lower than the set value H1, open the connecting valve 4 to supply the methanol in the methanol storage cavity 5 to the composite inhibitor storage cavity 3 to form a composite inhibitor, and stop the supply when the liquid level reaches the set value H2;

[0060] When the first liquid level monitoring sensor 14 detects that the liquid level in the inhalation inhibitor storage chamber 12 is lower than the set value H1, it will automatically open the connection valve 4 to supply the composite inhibitor in the composite inhibitor storage chamber 3 into the inhalation inhibitor storage chamber 12, and stop the supply when the liquid level reaches the set value H2;

[0061] Among them, H1 is 25% of the diameter of the self-circulation rapid plugging removal equipment for hydrate blockage in the deep-water gas pipeline, and H2 is 75% of the diameter of the self-circulation rapid plugging removal equipment for hydrate blockage in the deep-water gas pipeline

[0062] (4) Repeat steps (1) to (3) repeatedly to form a self-circulation until the hydrate blockage in the pipeline to be unblocked is solved.

[0063] In this embodiment, the front-end self-circulation can improve the utilization efficiency of the inhibitor, and the equipment can achieve automatic pressure regulation and self-circulation to supplement the inhibitor, which can save time in both the preliminary plugging removal preparation work and the speed during the plugging removal process. The efficiency is 30-50% higher than the existing plugging removal method of injecting a large amount of thermodynamic inhibitors.

[0064] In summary, the self-circulation rapid plugging removal equipment for hydrate blockage in the deep-water gas pipeline provided by the present invention forms a self-circulation of composite inhibitor injection - hydrate decomposition - methane inhalation - methanol preparation - inhibitor supplementation, effectively solving the safety problem of pipeline pressure control. And this self-circulation can realize the in-situ preparation of the composite inhibitor, without repeatedly supplementing the raw materials of the composite inhibitor during use, while also increasing the concentration of the composite inhibitor, further improving the plugging removal efficiency, shortening the plugging removal time, and reducing the plugging removal cost.

Claims

1. A self-circulating rapid unblocking device for hydrate blockage in deep-water gas pipeline, characterized in that: It includes an inhalation inhibitor storage chamber, a composite inhibitor storage chamber, a methanol storage chamber and a methane storage chamber which are connected in sequence; The side of the inhalation inhibitor storage chamber is provided with a rotating nozzle, and the bottom is provided with an inhibitor inhalation pipeline; The methane storage chamber is provided with a methane-to-methanol reaction chamber, and the rear end is connected with a power supply device.

2. The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment according to claim 1, characterized in that: The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment is cylindrical in shape as a whole, with a length of 1.4 to 1.6 m and a diameter of 80 to 85% of the diameter of the pipeline to be unblocked, and is made of titanium alloy.

3. The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment according to claim 1, characterized in that: The inhalation inhibitor storage chamber, the composite inhibitor storage chamber, the methanol storage chamber and the methane storage chamber are connected via a connecting valve.

4. The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment according to claim 1, characterized in that: The length of the inhalation inhibitor storage chamber is 18 to 22 cm, the length of the composite inhibitor storage chamber is 28 to 32 cm, the length of the methanol storage chamber is 48 to 52 cm, and the length of the methane storage chamber is 48 to 52 cm; Further preferably, the length of the inhalation inhibitor storage chamber is 20 cm, the length of the composite inhibitor storage chamber is 30 cm, the length of the methanol storage chamber is 50 cm, and the length of the methane storage chamber is 50 cm.

5. The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment according to claim 1, characterized in that: The inhalation inhibitor storage chamber is filled with a composite inhibitor; the methane storage chamber is filled with a carbon tetrachloride solution; the composite inhibitor storage chamber is filled with ethylene glycol; and the methanol storage chamber is filled with methanol.

6. The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment according to claim 1, characterized in that: A first liquid level detection sensor is disposed on the top of the inhalation inhibitor storage chamber, a second liquid level detection sensor is disposed on the top of the composite inhibitor storage chamber, and a pipeline pressure detection sensor is disposed on the top of the methanol storage chamber.

7. The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment according to claim 1, characterized in that: The methane to methanol reaction chamber has a gas suction port at the top and a gas discharge port at the bottom.

8. The deepwater gas pipeline hydrate blockage self-circulation rapid unblocking equipment according to claim 1, characterized in that: The power supply device is internally provided with an acoustic wave detection system and a displacement sensor.

9. A method for quickly removing blockage by using the deepwater gas pipeline hydrate blockage self-circulation rapid blockage removal device according to any one of claims 1 to 9, comprising the following steps: (1) The deepwater gas pipeline hydrate blockage self-circulating rapid unblocking equipment is lowered to the hydrate blockage position of the pipeline to be unblocked through a power supply device, and then the composite inhibitor in the inhibitor storage chamber is sucked into the blocked hydrate through a rotating nozzle to perform a rotational spraying operation; (2) The blocked hydrate begins to decompose under the action of the inhibitor, producing methane gas, which causes the pressure of the pipeline to be unblocked to increase. The pipeline pressure monitoring sensor monitors the pressure of the pipeline to be unblocked in real time. If it is higher than the set pressure (the set pressure is usually equal to the initial pressure of the pipeline), the gas suction port will automatically absorb external methane gas into the methane storage chamber, thereby reducing the pipeline pressure to the set pressure; (3) When the second liquid level monitoring sensor detects that the liquid level in the composite inhibitor storage chamber is lower than the set value, the connecting valve is opened to supply methanol in the methanol storage chamber to the composite inhibitor storage chamber to form a composite inhibitor, and the supply is stopped when the liquid level reaches the set value H2; When the first liquid level monitoring sensor detects that the liquid level in the inhalation inhibitor storage chamber is lower than the set value H1, it will automatically open the connecting valve to supply the composite inhibitor in the composite inhibitor storage chamber to the inhalation inhibitor storage chamber, and stop supplying when the liquid level reaches the set value H2; (4) Repeating steps (1) to (3) to form a self-circulation process until the hydrate blockage in the pipeline to be unblocked is resolved.

10. The blocking removal method according to claim 9, characterized in that: In step (3), H1 is 20-30% of the diameter of the self-circulating rapid unblocking equipment for deepwater gas pipeline hydrate blockage, and H2 is 70-80% of the diameter of the self-circulating rapid unblocking equipment for deepwater gas pipeline hydrate blockage.

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