Mud blocking system and mud blocking method for offshore ditching operation

Abstract

The invention discloses an offshore ditching operation mud blocking system which comprises an air curtain system, a gas input pipeline, a gas output pipeline, a compressed air system, a first valve assembly, a metering assembly and a control system. The gas pipeline and the gas output pipeline are respectively provided with a first valve assembly and a metering assembly, the gas curtain system is provided with a plurality of gas holes, the gas holes are used for guiding out gas flow output by the compressed air system to form a bubble curtain, and the metering assembly is used for measuring pressure, temperature and / or flow of the gas input pipeline and the gas output pipeline. The control system is connected with the compressed air system, the first valve assembly and the metering assembly. Bubbles generated by the device can form a bubble curtain to surround suspended soil particles generated by ditching, silt generated by ditching can be effectively prevented from diffusing outwards, surface fish eggs are prevented from being polluted by the silt, and the marine ecological environment is protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ocean engineering, in particular to a mud blocking system for offshore trenching operation and a mud blocking method. BACKGROUND

[0002] During the process of offshore trenching operation, suspended soil particles are generated, which are affected by the sea current and spread to the surrounding area, causing harm to the ecological environment of the trenching site.

[0003] At present, the offshore trenching device has a mud blocking curtain, which is lowered into the water to block the mud around the trenching machine. However, the existing mud blocking curtain is heavy, and the length of the curtain cloth needs to be adjusted according to the water depth, and it is not convenient to deploy and retract.

[0004] Therefore, there is an urgent need for a mud blocking system for offshore trenching operation. SUMMARY

[0005] One of the purposes of the present application is to provide a mud blocking system for offshore trenching operation, which can isolate the local construction water area from the non-operation area, thereby preventing the spread of mud flow and effectively protecting the ecological environment of the construction site. Another purpose of the present application is to provide a mud blocking method.

[0006] The first aspect of the present application provides a mud blocking system for offshore trenching operation, comprising an air curtain system, a gas input pipeline, a gas output pipeline, a compressed air system, a first valve assembly, a metering assembly and a control system, the air curtain system is connected with the compressed air system through the gas input pipeline and the gas output pipeline, the gas pipeline and the gas output pipeline are respectively provided with the first valve assembly and the metering assembly, the air curtain system is provided with a plurality of air holes, the air holes are used to guide the airflow output by the compressed air system to form an air bubble curtain, the metering assembly is used to measure the pressure, temperature and / or flow of the gas input pipeline and the gas output pipeline, and the control system is connected with the compressed air system, the first valve assembly and the metering assembly respectively.

[0007] The offshore ditching operation mud blocking system, preferably, the air curtain system comprises a plurality of air curtain pipes, a plurality of connecting pipes, a rotation controller, a second valve assembly, a catenary and a support, the air curtain pipes are connected end to end to form a plurality of nodes, the nodes are communicated through the connecting pipes to form a frame of the entire air curtain system, the top of the frame is connected with the support through the catenary, the air curtain pipe comprises an inner pipe and an outer pipe, the inner pipe is provided with an inner pipe air hole, the outer pipe is provided with an outer pipe air hole, the outer pipe is sleeved outside the inner pipe, adjacent inner pipes are connected end to end, the outer pipe is connected with the rotation controller, the rotation controller is connected with the control system, so that the rotation controller drives the outer pipe to rotate, adjusts the coincidence degree of the inner pipe air hole and the outer pipe air hole, controls the opening size of the outer pipe air hole, and the air curtain pipe is provided with the second valve assembly.

[0008] The offshore ditching operation mud blocking system, preferably, the compressed air system comprises a power supply and a compressed air pump, the power supply is connected with the compressed air pump, the compressed air pump is connected with the control system, and the compressed air pump is also connected with the gas input pipe and the gas output pipe respectively.

[0009] The offshore ditching operation mud blocking system, preferably, the gas input pipe comprises a first input pipe, a second input pipe and a connecting pipe, the input port of the first input pipe and the input port of the second input pipe are connected with the output port of the connecting pipe respectively, the input port of the connecting pipe is connected with the compressed air pump, the output port of the first input pipe and the output port of the second input pipe are connected with the air curtain pipe respectively, the first input pipe, the second input pipe and the connecting pipe are provided with the first valve assembly, and the first input pipe and the second input pipe are respectively provided with the metering assembly.

[0010] The offshore ditching operation mud blocking system, preferably, the first valve assembly comprises a first valve, a second valve, a third valve and a fourth valve, the first valve is arranged on the first input pipe, the second valve is arranged on the second input pipe, the third valve is arranged on the connecting pipe, and the fourth valve is arranged on the gas output pipe.

[0011] The offshore ditching operation mud blocking system, preferably, the metering assembly comprises a pressure gauge, a thermometer and / or a flowmeter.

[0012] The second application of the application provides a mud blocking method for offshore ditching operation by using the offshore ditching operation mud blocking system, which comprises the following steps: Checking whether the gas input pipe and the gas output pipe are leaking or not; The gas curtain system is placed at the designated position by the lifting equipment on the ship and is lowered to the designated depth; The third valve, the first valve and the fourth valve are opened, other valves are closed, the compression pump is opened to supply gas, the pipes of the gas curtain system generate bubbles from bottom to top in sequence until all the pipes of the gas curtain system generate bubbles to form a gas curtain, so that the sludge generated by trenching is blocked.

[0013] The step of checking whether the gas input pipe and the gas output pipe leak is preferably specifically as follows: The third valve, the first valve and the fourth valve are opened, other valves are closed, the outer pipe is rotated, the coincidence degree of the gas holes of the inner pipe and the outer pipe is adjusted to 0, the compression gas pump is opened, the readings of the thermometer, the pressure gauge and the flow meter on the first input pipe and the readings of the pressure gauge and the flow meter on the gas output pipe are observed, and whether the pipes leak is judged. The third valve, the second valve and the fourth valve are opened, other valves are closed, the coincidence degree of the gas holes of the inner pipe and the outer pipe is adjusted to 0, the compression gas pump is opened, the readings of the thermometer, the pressure gauge and the flow meter on the second input pipe and the readings of the pressure gauge and the flow meter on the gas output pipe are observed, and whether the pipes leak is judged.

[0014] The beneficial effects are: The bubbles generated by the device can form a bubble curtain to block the suspended soil particles generated by trenching, effectively block the outward diffusion of the silt generated by trenching, prevent the surface fish eggs from being polluted by silt, and protect the marine ecological environment.

[0015] The device is simple in design, convenient to use, low in cost and good in application effect. DETAILED DESCRIPTION

[0016] Figure 1 The figure is a structural schematic view of the device.

[0017] In the figure: 1, first gas curtain pipe; 2, second gas curtain pipe; 3, third gas curtain pipe; 4, fourth gas curtain pipe; 5, fifth gas curtain pipe; 6, sixth gas curtain pipe; 7, seventh gas curtain pipe; 8, eighth gas curtain pipe; 9, ninth gas curtain pipe; 10, tenth gas curtain pipe; 11, eleventh gas curtain pipe; 12, twelfth gas curtain pipe; 13, first thermometer; 14, first pressure gauge; 15, first flow meter; 16, second thermometer; 17, second pressure gauge; 18, second flow meter; 19, third pressure gauge; 20, third flow meter; 21, third valve; 22, first valve; 23, second valve; 24, fourth valve; 25, compressed air pump; 26, control system; 27-1, outer tube air hole; 27-2, inner tube air hole; 28, inner tube; 29, outer tube; 30-1, first connecting pipe; 30-2, second connecting pipe; 30-3, third connecting pipe; 30-4, fourth connecting pipe; 31, suspension chain; 32, support; 33, rotation controller; 34, power supply; 35, first input pipe; 36, second input pipe; 37, connecting pipe; 38, gas output pipe; 39, first valve; 40, second valve; 41, third valve; 42, fourth valve; 43, fifth valve; 44, sixth valve. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] In the description of the present application, it should be noted that the positions or location relationships indicated by the terms "upper", "lower" and the like are based on the positions or location relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the systems or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" to "twelfth" and the like are used to distinguish the parts, and have no special meaning unless otherwise stated. The above terms cannot be understood as indicating or implying relative importance.

[0020] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "setting" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] This invention provides a silt-blocking system for offshore trenching operations, comprising an air curtain system, a gas input pipe, a gas output pipe, a compressed air system, a first valve assembly, a metering assembly, and a control system. The air curtain system is connected to the compressed air system via the gas input pipe and the gas output pipe. The first valve assembly and the metering assembly are respectively installed on the gas pipe and the gas output pipe. The air curtain system has multiple air holes for discharging the airflow output by the compressed air system to form a bubble curtain. The metering assembly measures the pressure, temperature, and / or flow rate of the gas input pipe and the gas output pipe. The control system is connected to the compressed air system, the first valve assembly, and the metering assembly. This invention uses bubbles generated by the device to form a bubble curtain, effectively containing suspended silt particles generated during trenching and preventing the outward spread of silt, thus preventing surface fish eggs from being contaminated by silt and protecting the marine ecological environment.

[0022] The following section uses a mud-blocking system for offshore trenching operations as an example to illustrate the entire technical process in detail.

[0023] Example 1 like Figure 1 As shown, a mud-blocking system for offshore trenching operations includes an air curtain system, a gas input pipe 38, a gas output pipe 38, a compressed air system, a first valve assembly, a metering assembly, and a control system 26. The air curtain system is connected to the compressed air system through the gas input pipe and the gas output pipe 38. The first valve assembly and the metering assembly are respectively provided on the gas pipe and the gas output pipe 38. The air curtain system has multiple air holes for discharging the airflow output by the compressed air system to form a bubble curtain. The metering assembly is used to measure the pressure, temperature, and / or flow rate of the gas input pipe and the gas output pipe 38. The control system 26 is connected to the compressed air system, the first valve assembly, and the metering assembly.

[0024] The air curtain system comprises a first air curtain pipeline 1, a second air curtain pipeline 2, a third air curtain pipeline 3, a fourth air curtain pipeline 4, a fifth air curtain pipeline 5, a sixth air curtain pipeline 6, a seventh air curtain pipeline 7, an eighth air curtain pipeline 8, a ninth air curtain pipeline 9, a tenth air curtain pipeline 10, an eleventh air curtain pipeline 11, a twelfth air curtain pipeline 12, a rotating controller 33, a second valve assembly, a catenary 31 and a support 32, wherein the first air curtain pipeline 1, the second air curtain pipeline 2, the third air curtain pipeline 3 and the fourth air curtain pipeline 4 are connected head-to-tail to form a node, the fifth air curtain pipeline 5, the sixth air curtain pipeline 6, the seventh air curtain pipeline 7 and the eighth air curtain pipeline 8 are connected head-to-tail to form a node, the ninth air curtain pipeline 9, the tenth air curtain pipeline 10, the eleventh air curtain pipeline 11 and the twelfth air curtain pipeline 12 are connected head-to-tail to form a node, and each node connected head-to-tail is connected through a plurality of connecting pipelines to form a cubic frame of the entire air curtain system.

[0025] The connecting pipeline comprises a first connecting pipeline 30-1, a second connecting pipeline 30-2, a third connecting pipeline 30-3 and a fourth connecting pipeline 30-4, the first connecting pipeline 30-1 is arranged at the intersection side of the second air curtain pipeline 2 and the third air curtain pipeline 3, the second connecting pipeline 30-2 is arranged at the intersection side of the third air curtain pipeline 3 and the fourth air curtain pipeline 4, the third connecting pipeline 30-3 is arranged at the intersection side of the fourth air curtain pipeline 4 and the first air curtain pipeline 1, and the fourth connecting pipeline 30-4 is arranged at the intersection side of the first air curtain pipeline 1 and the second air curtain pipeline 2.

[0026] The top of the frame is connected with the support 32 through the catenary 31, the first air curtain pipeline 1, the second air curtain pipeline 2, the third air curtain pipeline 3, the fourth air curtain pipeline 4, the fifth air curtain pipeline 5, the sixth air curtain pipeline 6, the seventh air curtain pipeline 7, the eighth air curtain pipeline 8, the ninth air curtain pipeline 9, the tenth air curtain pipeline 10, the eleventh air curtain pipeline 11 and the twelfth air curtain pipeline 12 each comprise an inner pipeline 28 and an outer pipeline 29, the inner pipeline 28 is provided with an inner pipeline air hole, the outer pipeline 29 is provided with an outer pipeline air hole, the outer pipeline 29 is sleeved outside the inner pipeline 28, adjacent inner pipelines 28 are connected head-to-tail to realize the connection between the first air curtain pipeline 1, the second air curtain pipeline 2, the third air curtain pipeline 3, the fourth air curtain pipeline 4, the fifth air curtain pipeline 5, the sixth air curtain pipeline 6, the seventh air curtain pipeline 7, the eighth air curtain pipeline 8, the ninth air curtain pipeline 9, the tenth air curtain pipeline 10, the eleventh air curtain pipeline 11 and the twelfth air curtain pipeline 12, the rotating controller 33 is connected with the control system 26, the rotating controller is arranged close to the node to realize that the rotating controller 33 drives the outer pipeline 29 to rotate, adjusts the coincidence degree of the inner pipeline air hole 27-2 and the outer pipeline air hole 27-1, controls the size of the opening degree of the outer pipeline air hole 27-1, and the air curtain pipeline is provided with the second valve assembly.

[0027] The second valve assembly comprises a first valve 39, a second valve 40, a third valve 41, a fourth valve 42, a fifth valve 43 and a sixth valve 44, the first valve 39 and the fourth valve 42 are arranged on the fourth connecting pipeline 30-4, the second valve 40 and the fifth valve 43 are arranged on the third connecting pipeline 30-3, and the third valve 41 and the sixth valve 44 are arranged on the second connecting pipeline 30-2.

[0028] The compressed air system comprises a power supply 34 and a compressed air pump 25, the power supply 34 is connected with the compressed air pump 25, the compressed air pump 25 is connected with the control system 26, and the compressed air pump 25 is also connected with the gas input pipeline and the gas output pipeline 38 respectively.

[0029] The gas input pipeline comprises a first input pipeline 35, a second input pipeline 36 and a connecting pipeline 37, the input port of the first input pipeline 35 and the input port of the second input pipeline 36 are connected with the output port of the connecting pipeline 37 respectively, the input port of the connecting pipeline 37 is connected with the compressed air pump 25, the output port of the first input pipeline 35 and the output port of the second input pipeline 36 are connected with the gas curtain pipeline respectively, and the first input pipeline 35, the second input pipeline 36 and the connecting pipeline 37 are provided with a first valve assembly, and the first input pipeline 35 and the second input pipeline 36 are respectively provided with the metering assembly.

[0030] The first valve assembly comprises a first valve 22, a second valve 23, a third valve 21 and a fourth valve 24, the first valve 22 is arranged on the first input pipeline 35, the second valve 23 is arranged on the second input pipeline 36, the third valve 21 is arranged on the connecting pipeline 37, and the fourth valve 24 is arranged on the gas output pipeline 38.

[0031] The metering assembly comprises a first pressure gauge 14, a second pressure gauge 17, a third pressure gauge 19, a first temperature gauge 13, a second temperature gauge 16, a first flow gauge 15, a second flow gauge 18 and a third flow gauge 20.

[0032] The first flow gauge 15, the first pressure gauge 14 and the first temperature gauge 13 are sequentially arranged on the first input pipeline 35 in the gas flow direction; The second flow gauge 18, the second pressure gauge 17 and the second temperature gauge 16 are sequentially arranged on the second input pipeline 36 in the gas flow direction; The third pressure gauge 19 and the third flow gauge 20 are sequentially arranged on the gas output pipeline 38 in the gas flow direction.

[0033] Embodiment 2 As Figure 1 A mud blocking method for offshore trenching operation using the offshore trenching operation mud blocking system, comprising the following steps: S1: Check if the gas input pipe and the gas output pipe 38 are leaking.

[0034] The step S1 specifically comprises steps S11 and S22, which respectively comprise the following steps: S11: Open the third valve 21, the first valve 22 and the fourth valve 24, close other valves, rotate the outer pipe 29, adjust the coincidence degree of the inner pipe air hole 27-2 and the outer pipe air hole 27-1 to 0, open the compressed gas pump, observe the readings of the thermometer, pressure gauge and flow meter on the first input pipe 35, and the readings of the pressure gauge and flow meter on the gas output pipe 38, and determine if there is leakage. S12: Open the third valve 21, the second valve 23 and the fourth valve 24, close other valves, adjust the coincidence degree of the inner pipe air hole 27-2 and the outer pipe air hole 27-1 to 0, open the compressed gas pump 25, observe the readings of the thermometer, pressure gauge and flow meter on the second input pipe 36, and the readings of the pressure gauge and flow meter on the gas output pipe 38, and determine if there is leakage.

[0035] S2: Put the air curtain system to the designated position by the lifting equipment on the ship, and lower it to the designated depth.

[0036] From the third pressure gauge 19, the second thermometer 16 and the pipe behind the first thermometer 13, and the air curtain system enters the water.

[0037] S3: Open the third valve 21, the first valve 22 and the fourth valve 24, close other valves, open the compressed pump 25 to supply gas, and the pipes of the air curtain system successively generate bubbles from bottom to top, until all the pipes of the air curtain system generate bubbles, to form an air curtain, so as to realize the blocking of the sludge generated by the trenching.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A mud-blocking system for offshore trenching operations, characterized in that, The system includes an air curtain system, a gas input pipe, a gas output pipe, a compressed air system, a first valve assembly, a metering assembly, and a control system. The air curtain system is connected to the compressed air system via the gas input pipe and the gas output pipe. The first valve assembly and the metering assembly are respectively installed on the gas pipe and the gas output pipe. The air curtain system has multiple air holes for discharging the airflow output by the compressed air system to form a bubble curtain. The metering assembly is used to measure the pressure, temperature, and / or flow rate of the gas input pipe and the gas output pipe. The control system is connected to the compressed air system, the first valve assembly, and the metering assembly.

2. The silt-blocking system for offshore trenching operations according to claim 1, characterized in that, The air curtain system includes multiple air curtain pipes, multiple connecting pipes, a rotation controller, a second valve assembly, a catenary, and a support. The air curtain pipes are connected end-to-end to form multiple nodes, which are connected by the connecting pipes to form the framework of the entire air curtain system. The top of the framework is connected to the support via the catenary. Each air curtain pipe includes an inner pipe and an outer pipe. The inner pipe has an inner pipe air hole, and the outer pipe has an outer pipe air hole. The outer pipe is fitted over the inner pipe, and adjacent inner pipes are connected end-to-end. The outer pipe is connected to the rotation controller, which is connected to the control system to enable the rotation controller to drive the outer pipe to rotate, adjust the degree of overlap between the inner and outer pipe air holes, and control the opening size of the outer pipe air holes. The air curtain pipe is equipped with a second valve assembly.

3. The silt-blocking system for offshore trenching operations according to claim 2, characterized in that, The compressed air system includes a power supply and a compressed air pump. The power supply is connected to the compressed air pump, the compressed air pump is connected to the control system, and the compressed air pump is also connected to the gas input pipe and the gas output pipe.

4. The silt-blocking system for offshore trenching operations according to claim 3, characterized in that, The gas input pipeline includes a first input pipeline, a second input pipeline, and a connecting pipe. The input ports of the first input pipeline and the second input pipeline are respectively connected to the output port of the connecting pipe. The input port of the connecting pipe is connected to the compressed air pump. The output ports of the first input pipeline and the second input pipeline are respectively connected to the air curtain pipeline. The first valve assembly is provided on the first input pipeline, the second input pipeline, and the connecting pipe. The metering assembly is provided on the first input pipeline and the second input pipeline.

5. The silt-blocking system for offshore trenching operations according to claim 4, characterized in that, The first valve assembly includes a first valve, a second valve, a third valve, and a fourth valve. The first valve is disposed on the first input pipe, the second valve is disposed on the second input pipe, the third valve is disposed on the connecting pipe, and the fourth valve is disposed on the gas output pipe.

6. The silt-blocking system for offshore trenching operations according to claim 5, characterized in that, The metering components include pressure gauges, thermometers, and / or flow meters.

7. A method for preventing mud in marine trenching operations using the mud-blocking system according to any one of claims 1 to 6, characterized in that, Includes the following steps: Check the gas inlet and outlet pipes for leaks. The air curtain system is placed in the designated location and lowered to the designated depth using the ship's lifting equipment; Open the third, first, and fourth valves, close the other valves, and start the compressor pump to supply air. The air curtain system's pipes generate bubbles sequentially from bottom to top until all pipes of the air curtain system generate bubbles to form an air curtain, thereby containing the sludge generated during trenching.

8. The mud-blocking method for offshore trenching operations according to claim 7, characterized in that, The step of "checking whether the gas input pipe and gas output pipe are leaking" specifically includes the following steps: Open the third valve, the first valve, and the fourth valve, close the other valves, rotate the outer pipe to adjust the overlap between the inner pipe vent and the outer pipe vent to 0, turn on the compressed air pump, and observe the readings of the thermometer, pressure gauge, and flow meter on the first input pipe, as well as the readings of the pressure gauge and flow meter on the gas output pipe to determine if there is a leak. Open the third, second, and fourth valves, close the other valves, adjust the overlap between the inner and outer air holes to 0, turn on the compressed air pump, and observe the readings of the thermometer, pressure gauge, and flow meter on the second input pipe, as well as the readings of the pressure gauge and flow meter on the gas output pipe, to determine if there is a leak.

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