Gas lift sludge discharge device of subsea pipeline rear ditching equipment

Abstract

The utility model discloses a gas lift sludge discharge device of subsea pipeline rear ditching equipment, the gas lift sludge discharge device of subsea pipeline rear ditching equipment comprises a gas lift suction valve and a gas lift sludge raising arm, the gas lift sludge raising arm is arranged at one end of the gas lift suction valve, the gas lift sludge raising arm is connected with the gas lift suction valve through a throat pipe, the gas lift suction valve is connected with a high-pressure air inlet pipe, and the throat pipe is connected with the gas lift suction valve. And the gas lift suction valve is provided with a gas pressure measuring instrument for detecting the internal pressure of the gas lift suction valve, and one end, far away from the gas lift mud raising arm, of the gas lift suction valve is connected with a gas lift suction arm. According to the air-lift sludge discharging device of the subsea pipeline rear ditching equipment, the air-lift suction valve is connected with the air-lift suction arm, a mud-water mixture carried by high-pressure air in the air-lift suction valve enters the air-lift sludge raising arm along the air-lift suction arm through the air-lift suction valve, and suction operation of the mud-water mixture is achieved. High-pressure gas is used for large-flow sediment suction, the high-pressure gas is circumferentially and uniformly distributed and ejected, and the gas lift sludge discharge efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the field of marine petroleum engineering, in particular to an air lift mud discharge device of trenching equipment behind a sea pipeline. Background Art

[0002] The mud discharge device in the high-efficiency deep trenching equipment for submarine pipelines plays a key role in the deep trenching construction process of submarine pipelines. The efficiency of the mud discharge device design is directly related to the trenching efficiency and trenching effect of the trencher.

[0003] Traditional gas lift mud removal devices generally have a separate air pipe directly inserted under the mud suction pipe. The negative pressure formed by high-pressure gas in the mud discharge pipe drives the mud and water mixture out of the pipe. Because the air pipe occupies part of the cross-sectional area of ​​the mud suction pipe, the overall mud suction and discharge effect is not high, and the air pipe is easily eroded and worn by sand-containing seawater.

[0004] Therefore, it is urgent to design an air lift mud discharge device for trenching equipment behind the submarine pipeline to solve the problem of high-pressure gas discharge of mud-water mixture mentioned above. Utility Model Content

[0005] In order to solve the technical problems mentioned in the background technology that the air pipe occupies part of the cross-sectional area of ​​the mud suction pipe, so the overall mud suction and discharge effect is not high, and the air pipe is easily washed and worn by sand-containing seawater, an air lift mud discharge device for trenching equipment behind the submarine pipeline is provided to solve the problem of high-pressure gas discharge of mud-water mixture.

[0006] To achieve the above objectives, the specific technical solutions of the air lift mud removal device of the trenching equipment behind the submarine pipeline of the present invention are as follows:

[0007] A gas lift mud discharge device for trenching equipment behind a subsea pipeline comprises a gas lift suction valve and a gas lift mud raising arm. The gas lift mud raising arm is arranged at one end of the gas lift suction valve and is connected to the gas lift suction valve via a throat pipe. The gas lift suction valve is connected to a high-pressure air inlet pipe to allow high-pressure gas to enter the gas lift suction valve. The gas lift suction valve is provided with an air pressure measuring instrument to detect the internal pressure of the gas lift suction valve. The gas lift suction valve is connected to the gas lift suction arm at one end away from the gas lift mud raising arm.

[0008] Furthermore, the gas lift mud arm includes a mud pipeline and a mounting flange. The mounting flange is arranged at one end of the mud pipeline and is connected to the throat. An extension flange is provided at the end of the mud pipeline away from the mounting flange, and a first lifting lug is provided on the outer wall of the mud pipeline.

[0009] Furthermore, the gas lift suction valve includes a first pipeline and a second pipeline, the first pipeline is provided inside the second pipeline, the first pipeline is a mud-water mixture channel, and a high-pressure gas channel is between the first pipeline and the second pipeline.

[0010] Furthermore, a high-pressure gas inlet and an air pressure measuring port are provided on the second pipeline at intervals. The high-pressure gas inlet is connected to the high-pressure air inlet pipe, and the air pressure measuring port is connected to an air pressure measuring instrument.

[0011] Furthermore, a second lifting lug is provided on the second pipeline to suspend and place the gas lift suction valve.

[0012] Furthermore, the throat pipe includes a contraction pipe section, an upper connecting flange and a lower connecting flange, and the upper connecting flange and the lower connecting flange are respectively arranged at two ends of the contraction pipe section.

[0013] Furthermore, the upper connecting flange is connected to the mounting flange, and the lower connecting flange is connected to the first connecting flange at the end of the second pipeline.

[0014] Furthermore, the gas lift suction arm includes a straight pipe section and a diffuser section, the diffuser section is arranged on the straight pipe section, the diffuser section is connected to a fixed flange at one end away from the straight pipe section, and a mud suction hole is provided at one end of the straight pipe section away from the diffuser section.

[0015] Furthermore, an anti-clogging baffle and a baffle are provided inside the straight pipe section, and the anti-clogging baffle and the baffle are located on one side of the mud suction hole.

[0016] Furthermore, the fixed flange connected to the diffuser section is connected to the second connecting flange at the end of the second pipeline.

[0017] The air lift mud removal device of the utility model for trenching equipment behind the submarine pipeline has the following advantages:

[0018] The gas lift suction valve is connected to the gas lift suction arm. The high-pressure gas in the gas lift suction valve carries the mud-water mixture along the gas lift suction arm and enters the gas lift mud arm through the gas lift suction valve, thus achieving the suction operation of the mud-water mixture. This application mainly utilizes high-pressure gas to perform large-flow sediment suction, and designs and manufactures an efficient gas lift suction valve and a wear-resistant throat pipe, effectively solving the original problem. The high-pressure gas is evenly distributed around the circumference, and the throat pipe is made of high-strength high-chromium cast iron, which is wear-resistant and strong. After theoretical calculation and practical application, the gas lift mud removal efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall structural diagram of the air lift mud removal device of the utility model's trenching equipment behind the submarine pipeline;

[0020] Figure 2 This is a structural diagram of the air lift mud arm of the air lift mud discharge device of the trenching equipment behind the submarine pipeline of the utility model;

[0021] Figure 3 This is a structural diagram of the throat of the air lift mud removal device of the trenching equipment behind the submarine pipeline of the utility model;

[0022] Figure 4This is a structural diagram of the air lift suction valve of the air lift mud removal device of the trenching equipment behind the submarine pipeline of the utility model;

[0023] Figure 5 This is a working diagram of the air lift suction valve of the air lift mud removal device of the trenching equipment behind the submarine pipeline of the utility model;

[0024] Figure 6 This is a structural schematic diagram of the air lift suction arm of the air lift mud removal device of the trenching equipment behind the submarine pipeline of the utility model;

[0025] Figure 7 This is a working schematic diagram of the air lift suction arm of the air lift mud removal device of the submarine pipeline rear trenching equipment of the present invention.

[0026] Description of the marks in the figure:

[0027] 1. Gas lift mud arm; 11. Mud lifting pipeline; 12. Mounting flange; 13. Extension flange; 14. First lifting lug; 2. Throat; 21. Contraction pipe section; 22. Upper connecting flange; 23. Lower connecting flange; 3. Gas lift suction valve; 31. First pipeline; 32. Second pipeline; 33. High-pressure gas inlet; 34. Air pressure measuring port; 35. Second lifting lug; 36. First connecting flange; 37. Second connecting flange; 4. Gas lift suction arm; 41. Straight pipe section; 42. Diffuser section; 43. Fixed flange; 44. Anti-clogging partition; 45. Barrier; 46. Mud suction hole; 5. High-pressure air inlet pipe; 6. Air pressure measuring instrument. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is intended to be within the scope of the present invention and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0030] Please refer to the attached Figure 1 To the attached Figure 7 The utility model describes an air lift mud discharge device of trenching equipment behind a submarine pipeline.

[0031] like Figure 1As shown, the gas lift mud discharge device of the trenching equipment behind the subsea pipeline in the utility model includes an gas lift suction valve 3 and a gas lift mud arm 1. The gas lift mud arm 1 is arranged at one end of the gas lift suction valve 3. The gas lift mud arm 1 is connected to the gas lift suction valve 3 through a throat pipe 2. The gas lift suction valve 3 is connected to a high-pressure air inlet pipe 5 to allow high-pressure gas to enter the gas lift suction valve 3. The gas lift suction valve 3 is provided with an air pressure measuring instrument 6 to detect the internal pressure of the gas lift suction valve 3. The end of the gas lift suction valve 3 away from the gas lift mud arm 1 is connected to the gas lift suction arm 4.

[0032] The gas lift suction valve 3 is connected to the gas lift suction arm 4. The mud-water mixture carried by the high-pressure gas in the gas lift suction valve 3 flows along the gas lift suction arm 4 and enters the gas lift mud arm 1 through the gas lift suction valve 3, thereby achieving the suction operation of the mud-water mixture. This application mainly utilizes high-pressure gas to perform large-flow sediment suction, designs an efficient gas lift suction valve 3, and designs and manufactures a wear-resistant throat pipe 2, effectively solving the original problem. The high-pressure gas is evenly distributed around the circumference, and the throat pipe 2 is made of high-strength high-chromium cast iron, which is wear-resistant and strong. After theoretical calculation and practical application, the gas lift mud removal efficiency is higher.

[0033] Further, if Figures 1 to 5 As shown, the gas lift mud arm 1 includes a mud lifting pipeline 11 and a mounting flange 12. The mounting flange 12 is arranged at one end of the mud lifting pipeline 11 and is connected to the throat pipe 2. An extension flange 13 is provided at the end of the mud lifting pipeline 11 away from the mounting flange 12, and a first lifting ear 14 is provided on the outer wall of the mud lifting pipeline 11; the gas lift suction valve 3 includes a first pipeline 31 and a second pipeline 32. The first pipeline 31 is provided inside the second pipeline 32. The interior of the first pipeline 31 is a mud-water mixture channel, and a high-pressure gas channel is provided between the first pipeline 31 and the second pipeline 32; a high-pressure gas inlet 33 and an air pressure measuring port 34 are provided at intervals on the second pipeline 32. The high-pressure gas inlet 33 is connected to the high-pressure air inlet pipe 5, and the air pressure measuring port 34 is connected to the air pressure measuring instrument 6.

[0034] In this embodiment, preferably, a mounting flange 12 is welded to one end of the mud raising pipeline 11, and the mounting flange 12 is connected to the throat pipe 2. An extension flange 13 is welded to the end of the mud raising pipeline 11 away from the mounting flange 12, and the extension flange 13 is used to extend the mud raising pipeline 11; a first lifting lug 14 is vertically welded to the mud raising pipeline 11, and the first lifting lug 14 is used to realize the overall lifting of the gas lift mud raising arm 1.

[0035] Preferably, the gas lift suction valve 3 as a whole is composed of a first pipeline 31 and a second pipeline 32. The first pipeline 31 is arranged inside the second pipeline 32. The sucked mud and water mixture flows into the first pipeline 31. High-pressure gas is added between the first pipeline 31 and the second pipeline 32, thereby driving the mud and water mixture to flow along the first pipeline 31.

[0036] A high-pressure gas inlet 33 and an air pressure measuring port 34 are provided on the outer wall of the second pipeline 32. Preferably, the high-pressure gas inlet 33 and the air pressure measuring port 34 are arranged at intervals, and along the outflow direction of the mud-water mixture, the high-pressure gas inlet 33 is located above the air pressure measuring port 34. The high-pressure gas inlet 33 is connected to the high-pressure air inlet pipe 5 to enable high-pressure gas to enter between the first pipeline 31 and the second pipeline 32. The air pressure measuring port 34 is connected to the air pressure measuring instrument 6 to monitor the pressure value of the high-pressure gas.

[0037] Further, if Figure 1 and Figure 3 As shown, a second lifting lug 35 is provided on the second pipeline 32 to suspend the gas lift suction valve 3; the throat pipe 2 includes a contraction pipe section 21, an upper connecting flange 22 and a lower connecting flange 23, and the upper connecting flange 22 and the lower connecting flange 23 are respectively arranged at both ends of the contraction pipe section 21; the upper connecting flange 22 is connected to the mounting flange 12, and the lower connecting flange 23 is connected to the first connecting flange 36 at the end of the second pipeline 32.

[0038] In this embodiment, a second lifting lug 35 is provided on the outer wall of the second pipeline 32. Preferably, the second lifting lug 35 is vertically welded to the outer wall of the second pipeline 32, thereby enabling the gas lift suction valve 3 to be suspended and lowered. The throat pipe 2 comprises a contraction pipe section 21, an upper connecting flange 22, and a lower connecting flange 23. Because the gas-liquid mixture flows through the throat pipe 2, it must be wear-resistant. The throat pipe 2 is made of high-chromium cast iron and is cast in one piece, making it wear-resistant, durable, and easy to replace.

[0039] Preferably, the contraction pipe section 21 is provided with an upper connecting flange 22 at one end connected to the mounting flange 12, and the contraction pipe section 21 is provided with a lower connecting flange 23 at one end connected to the first connecting flange 36, thereby realizing the connection of the air lift mud arm 1 to the air lift suction valve 3, and the contraction pipe section 21 is closed from the side of the lower connecting flange 23 to the side of the upper connecting flange 22.

[0040] High-pressure gas enters the space between the first pipeline 31 and the second pipeline 32 from the high-pressure air inlet pipe 5, and is sprayed from a circle of air holes on the end surface toward the contraction section 21 of the throat pipe 2 along the circumference, forming a strong negative pressure in the center of the first pipeline 31 of the air lift suction valve 3. The negative pressure drives the mud-water mixture to flow upward and is ejected along the air lift mud arm 1, completing the entire suction process.

[0041] Further, if Figure 6 and Figure 7As shown, the gas lift suction arm 4 includes a straight pipe section 41 and a diffuser section 42. The diffuser section 42 is arranged on the straight pipe section 41. The diffuser section 42 is connected to a fixed flange 43 at one end away from the straight pipe section 41. The straight pipe section 41 is provided with a mud suction hole 46 at one end away from the diffuser section 42. An anti-clogging baffle 44 and a baffle 45 are provided inside the straight pipe section 41. The anti-clogging baffle 44 and the baffle 45 are located on one side of the mud suction hole 46. The fixed flange 43 connected to the diffuser section 42 is connected to the second connecting flange 37 at the end of the second pipeline 32.

[0042] In this embodiment, preferably, the air lift suction arm 4 is composed of a straight pipe section 41 and a diffuser section 42. The diffuser section 42 is connected to the straight pipe section 41. A fixed flange 43 is welded to the end of the diffuser section 42 away from the straight pipe section 41. A mud suction hole 46 is opened at the end of the straight pipe section 41 away from the diffuser section 42 to absorb the mud-water mixture.

[0043] An anti-clogging baffle 44 and a baffle 45 are welded on the inner wall of the straight pipe section 41. Preferably, the anti-clogging baffle 44 and the baffle 45 are welded on one side of the mud suction hole 46 to prevent the mud suction hole 46 from being blocked; a fixed flange 43 is connected to the diffuser section 42 and is connected to the second connecting flange 37 at the end of the second pipeline 32.

[0044] The working principle of the air lift mud removal device of the trenching equipment behind the submarine pipeline in the utility model is as follows:

[0045] High-pressure gas enters the air lift suction valve 3 between the first pipeline 31 and the second pipeline 32 from the high-pressure air inlet pipe 5, and is sprayed from a circle of air holes on the end surface along the circumference to the contraction pipe section 21 of the throat pipe 2, forming a strong negative pressure at the center of the inner tube of the air lift suction valve 3. The negative pressure drives the mud, sand and water mixture to flow upward from the suction port of the air lift suction arm 4 and be ejected along the air lift mud arm 1, completing the entire suction process.

[0046] Based on the gas lift mud removal device of the trenching equipment behind the subsea pipeline, the utility model is connected to the gas lift suction arm 4 through the gas lift suction valve 3. The mud and water mixture carried by the high-pressure gas in the gas lift suction valve 3 flows along the gas lift suction arm 4 and enters the gas lift mud arm 1 through the gas lift suction valve 3, thereby achieving the suction operation of the mud and water mixture. This application mainly utilizes high-pressure gas to perform large-flow mud suction, designs an efficient gas lift suction valve 3, and designs and manufactures a wear-resistant throat pipe 2, effectively solving the original problem. The high-pressure gas is evenly distributed on the circumference, and the throat pipe 2 is made of high-strength high-chromium cast iron, which is wear-resistant and strong. After theoretical calculation and practical application, the gas lift mud removal efficiency is higher.

[0047] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An air lift mud removal device for trenching equipment behind a submarine pipeline, characterized in that: It includes a gas lift suction valve and a gas lift mud arm. The gas lift mud arm is arranged at one end of the gas lift suction valve. The gas lift mud arm is connected to the gas lift suction valve through a throat pipe. The gas lift suction valve is connected to a high-pressure air inlet pipe to allow high-pressure gas to enter the gas lift suction valve. The gas lift suction valve is provided with an air pressure measuring instrument to detect the internal pressure of the gas lift suction valve. The gas lift suction valve is connected to the gas lift suction arm at one end away from the gas lift mud arm.

2. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 1, characterized in that: The gas lift mud arm includes a mud lifting pipeline and a mounting flange. The mounting flange is arranged at one end of the mud lifting pipeline and is connected to the throat. An extension flange is arranged at the end of the mud lifting pipeline away from the mounting flange, and a first lifting lug is arranged on the outer wall of the mud lifting pipeline.

3. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 1, characterized in that: The gas lift suction valve includes a first pipeline and a second pipeline. The first pipeline is arranged inside the second pipeline. The first pipeline is a mud-water mixture channel. A high-pressure gas channel is located between the first pipeline and the second pipeline.

4. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 3, characterized in that: A high-pressure gas inlet and an air pressure measuring port are provided on the second pipeline at intervals. The high-pressure gas inlet is connected to the high-pressure air inlet pipe, and the air pressure measuring port is connected to an air pressure measuring instrument.

5. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 4, characterized in that: A second lifting lug is provided on the second pipeline for hanging and lowering the gas lift suction valve.

6. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 1, characterized in that: The throat pipe comprises a contraction pipe section, an upper connecting flange and a lower connecting flange, wherein the upper connecting flange and the lower connecting flange are respectively arranged at two ends of the contraction pipe section.

7. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 6, characterized in that: The upper connecting flange is connected to the mounting flange, and the lower connecting flange is connected to the first connecting flange at the end of the second pipeline.

8. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 1, characterized in that: The gas lift suction arm includes a straight pipe section and a diffuser section. The diffuser section is arranged on the straight pipe section. The diffuser section is connected to a fixed flange at one end away from the straight pipe section. The straight pipe section is provided with a mud suction hole at one end away from the diffuser section.

9. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 8, characterized in that: Anti-clogging baffles and barriers are provided inside the straight pipe section, and the anti-clogging baffles and barriers are located on one side of the mud suction hole.

10. The air lift mud removal device for trenching equipment behind a submarine pipeline according to claim 8, characterized in that: The fixed flange connected to the diffusion section is connected to the second connecting flange at the end of the second pipeline.

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