Collecting system for dirty oil in underwater oil control cover and construction method of collecting system

Abstract

The invention discloses a sump oil collecting system in an underwater oil control cover and a construction method thereof.The sump oil collecting system in the underwater oil control cover comprises the oil control cover, the oil control cover is arranged above an oil leakage point of an underwater Christmas tree, sump oil in the oil control cover is extracted through a pump front filter arranged in the oil control cover, the sump oil is conveyed to an oil remover through a sump oil pump, and the oil remover is used for removing the sump oil in the oil control cover; the oil remover separates dirty oil from seawater, the separated dirty oil is recycled into the dirty oil tank, and the seawater is discharged back to the sea through the water discharging pipe. According to the system for collecting the dirty oil in the underwater oil control cover, the dirty oil is gathered to the top of the oil control cover through the oil control cover, the dirty oil is conveyed into the degreaser through the pump front filter by means of the dirty oil pump, after an oil-water mixture is treated through the degreaser, qualified water is discharged into the sea, and the rest of the dirty oil is conveyed to the land through the recovery ship to be treated. The problem that the water content in sump oil is too large can be solved, the volume of oil-water mixed liquid is reduced, the volume of the sump oil tank is reduced, the sewage treatment economy is improved, and marine pollution is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore oil engineering, and particularly relates to a system for collecting contaminated oil inside an underwater oil control cover and a construction method thereof. Background Art

[0002] Currently, when oil spills occur in underwater production facilities, the main method of recovery is to use an oil containment boom to enclose the oil spill on the sea surface, and then use oil-absorbing materials that can adsorb the oil spill to adsorb and recover the oil spill on the sea surface, or clean the oil spill through chemical oil dispersants and combustion methods.

[0003] However, the recovery of oil spills using an oil containment boom and oil-absorbing materials has the disadvantages of limited recovery capacity and large construction volume; cleaning oil spills through chemical oil dispersants and combustion methods will damage the sea water and do not meet environmental protection requirements.

[0004] Therefore, there is an urgent need to design a system for collecting contaminated oil inside an underwater oil control cover to solve the above-mentioned problems. Summary of the Invention

[0005] To solve the technical problems mentioned in the background art that the oil containment boom, oil-absorbing materials, chemical oil dispersants, and combustion methods have limited ability to clean oil spills and do not meet environmental protection requirements, a system for collecting contaminated oil inside an underwater oil control cover is provided to solve the problem of recovering oil spills.

[0006] To achieve the above object, the specific technical solution of the system for collecting contaminated oil inside an underwater oil control cover of the present invention is as follows: A system for collecting contaminated oil inside an underwater oil control cover includes an oil control cover, which is arranged above the oil spill point of an underwater Christmas tree. The contaminated oil inside the oil control cover is extracted by a pre-pump filter arranged inside the oil control cover, and the contaminated oil is transmitted to an oil separator by an oil pump. The oil separator separates the contaminated oil from the sea water, and the separated contaminated oil is recovered into an oil storage tank, and the sea water is discharged back into the sea through a drain pipe.

[0007] Further, the side of the oil control cover away from the sea surface is arranged on the seabed so that the oil spill point of the underwater Christmas tree is located inside the oil control cover.

[0008] Further, a pre-pump filter is connected to one end of the oil control cover away from the underwater Christmas tree, and the pre-pump filter is connected to the oil pump through an oil transfer hose.

[0009] Further, the upper part of the oil control cover is arranged in a conical structure, and the pre-pump filter is located inside the conical structure of the oil control cover.

[0010] Further, the oil pump is arranged on an oil recovery ship, and one end of the oil pump away from the pre-pump filter is connected to the oil separator to separate the contaminated oil from the sea water.

[0011] Further, an oil storage tank is arranged inside the oil recovery ship, and the oil storage tank is connected to the oil outlet of the oil separator so that the separated contaminated oil is recovered in the oil storage tank.

[0012] Furthermore, a drain pipe is connected to the drain outlet of the oil separator to discharge the separated seawater back into the sea.

[0013] A construction method for an internal oil pollution collection system of an underwater oil control cover mainly includes the following steps: S1. Move the oil pollution recovery ship to a position near the oil leakage point of the underwater Christmas tree. S2. Fix the oil control cover to the seabed and install a pre-pump filter connected to an oil pump inside the oil control cover. S3. Start the oil pump to pump the oily sewage into the oil separator, and the oil separator separates seawater from the oil pollution. S4. The separated oil pollution is stored in an oil pollution tank, and the seawater is directly discharged into the sea through a drain pipe.

[0014] Furthermore, the oil pollution recovery ship is equipped with a recovery device, and the recovery device is connected to the oil control cover so that the oil control cover can be recovered onto the oil pollution recovery ship.

[0015] The internal oil pollution collection system of the underwater oil control cover of the present invention has the following advantages: The oil pollution is converged to the top of the oil control cover through the oil control cover, and the oil pump is used to transport the oil pollution to the oil separator through the pre-pump filter. After the oil-water mixture is treated by the oil separator, the qualified water is discharged into the sea, and the remaining oil pollution is transported to land for treatment by the recovery ship. This application can solve the problem of excessive water content in the oil pollution, reduce the volume of the oil-water mixture, reduce the volume of the oil pollution tank, improve the economy of sewage treatment, and reduce marine pollution. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the internal oil pollution collection system of the underwater oil control cover of the present invention.

[0017] Explanation of the markings in the figure: 1. Oil control cover; 2. Pre-pump filter; 3. Oil transfer hose; 4. Oil pollution recovery ship; 5. Oil pump; 6. Oil separator; 7. Oil pollution tank; 8. Drain pipe. Detailed Embodiments

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0019] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0020] The following will describe the system for collecting contaminated oil inside the underwater oil control cover of the present invention with reference to the attached Figure 1 description of the system for collecting contaminated oil inside the underwater oil control cover of the present invention.

[0021] As Figure 1 shown, the system for collecting contaminated oil inside the underwater oil control cover in the present invention includes an oil control cover 1, the oil control cover 1 is arranged above the oil leakage point of the underwater Christmas tree, and the contaminated oil inside the oil control cover 1 is extracted by a pre-pump filter 2 arranged inside the oil control cover 1. The contaminated oil is transported to an oil-water separator 6 by an oil pump 5. The oil-water separator 6 separates the contaminated oil from seawater. The separated contaminated oil is recycled into an oil storage tank 7, and the seawater is discharged back into the sea through a drain pipe 8.

[0022] The contaminated oil is converged to the top of the oil control cover 1 through the oil control cover 1, and the contaminated oil is transported to the oil-water separator 6 through the pre-pump filter 2 by using the oil pump 5. After the oil-water mixture is treated by the oil-water separator 6, the qualified water is discharged into the sea, and the remaining contaminated oil is transported to land for treatment by a recovery ship. This application can solve the problem of excessive water content in the contaminated oil, reduce the volume of the oil-water mixture, reduce the volume of the oil storage tank, improve the economy of sewage treatment, and reduce marine pollution.

[0023] Further, as Figure 1 shown, one side of the oil control cover 1 away from the sea surface is arranged on the seabed so that the oil leakage point of the underwater Christmas tree is located inside the oil control cover 1; one end of the oil control cover 1 away from the underwater Christmas tree is connected with a pre-pump filter 2, and the pre-pump filter 2 is connected with the oil pump 5 through an oil delivery hose 3; the upper part of the oil control cover 1 is set as a conical structure, and the pre-pump filter 2 is located inside the conical structure of the oil control cover 1.

[0024] In this embodiment, when the underwater Christmas tree arranged on the seabed leaks contaminated oil, the hollow oil control cover 1 is covered on the leakage position of the underwater Christmas tree, and then the leaked contaminated oil is collected. Preferably, the oil control cover 1 is composed of a middle cylindrical wall and a top conical structure. Since the leaked contaminated oil will move from the seabed to the sea surface, the conical structure of the oil control cover 1 can collect the leaked contaminated oil at the top of the oil control cover 1.

[0025] The bottom end of the oil control cover 1 is fixed on the seabed so that the oil leakage point of the underwater Christmas tree is located inside the oil control cover 1, ensuring that the oil control cover 1 can effectively collect the leaked contaminated oil; a connection port is provided at the vertex of the conical structure of the oil control cover 1, and the pre-pump filter 2 is connected to the connection port through an oil delivery hose 3 so that the pre-pump filter 2 is arranged inside the conical structure.

[0026] Preferably, the pre-pump filter 2 has the property of being lipophilic and hydrophobic, thereby initially filtering the water in the oil-water mixture in the oil control hood 1 to ensure that the waste oil enters the oil separator 6 through the pre-pump filter 2 for the final oil-water separation operation.

[0027] Further, as Figure 1 shown, the waste oil pump 5 is arranged on the waste oil recovery ship 4. One end of the waste oil pump 5 far from the pre-pump filter 2 is connected to the oil separator 6 to separate the waste oil from seawater. A waste oil tank 7 is arranged inside the waste oil recovery ship 4, and the waste oil tank 7 is connected to the oil outlet of the oil separator 6 to recover the separated waste oil in the waste oil tank 7. A drain pipe 8 is connected to the water outlet of the oil separator 6 to discharge the separated seawater back into the sea (A).

[0028] In this embodiment, preferably, the waste oil pump 5 is arranged on the deck of the waste oil recovery ship 4. The waste oil pump 5 is connected to the pre-pump filter 2 through an oil transfer hose 3, and the waste oil pump 5 is connected to the oil separator 6 through a delivery pipe. The waste oil pump 5 is started to suck the waste oil initially filtered by the pre-pump filter 2 into the oil separator 6 for the final water removal work.

[0029] The oil separator 6 is arranged on the deck of the waste oil recovery ship 4. A waste oil tank 7 is arranged inside the waste oil recovery ship 4, and the waste oil tank 7 is connected to the oil outlet of the oil separator 6 to recover the waste oil separated by the oil separator 6 in the waste oil tank 7. The seawater separated by the oil separator 6 is discharged back into the sea through the drain pipe 8 connected to the water outlet of the oil separator 6.

[0030] This application also provides a construction method for a waste oil collection system in an underwater oil control hood, which mainly includes the following steps: S1. Drive the waste oil recovery ship 4 to the vicinity of the oil leakage point of the underwater Christmas tree; S2. Fix the oil control hood 1 to the seabed and set a pre-pump filter 2 connected to the waste oil pump 5 inside the oil control hood 1; S3. Start the waste oil pump 5 to pump the oily sewage into the oil separator 6, and the oil separator 6 separates the seawater from the waste oil; S4. The separated waste oil is stored in the waste oil tank 7, and the seawater is directly discharged into the sea through the drain pipe 8; S5. The waste oil recovery ship 4 is provided with a recovery device, and the recovery device is connected to the oil control hood 1 to recover the oil control hood 1 onto the waste oil recovery ship 4; S6. After the collection operation is completed, transport the waste oil tank 7 to land for treatment.

[0031] The sewage oil collection system based on the underwater oil control cover converges the sewage oil to the top of the oil control cover 1 through the oil control cover 1, and uses the sewage oil pump 5 to transport the sewage oil to the oil separator 6 through the pre-pump filter 2. After the oil-water mixture is treated by the oil separator 6, the qualified water is discharged into the sea, and the remaining sewage oil is transported to the land for treatment by the sewage oil recovery ship 4. This application can solve the problem of excessive water content in the sewage oil, reduce the volume of the oil-water mixture, reduce the volume of the sewage oil tank 7, improve the economy of sewage treatment, and reduce marine pollution.

[0032] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A dirty oil collection system in an underwater oil control hood, characterized in that: It includes an oil control hood, which is arranged above the oil leakage point of the underwater oil tree. The dirty oil in the oil control hood is extracted through the pre-pump filter arranged in the oil control hood, and the dirty oil is transmitted to the oil remover by the dirty oil pump. The oil remover separates the dirty oil from seawater. The separated dirty oil is recovered into the dirty oil tank, and the seawater is discharged back to the sea through the drain pipe.

2. The dirty oil collection system in the underwater oil control cover according to claim 1 is characterized in that: The oil control cover is arranged on the seabed on the side away from the sea surface so that the oil leakage point of the underwater oil tree is located inside the oil control cover.

3. The dirty oil collection system in the underwater oil control cover according to claim 1 is characterized in that: The end of the oil control cover away from the underwater oil tree is connected with a pre-pump filter, and the pre-pump filter is connected to the dirty oil pump through an oil delivery hose.

4. The dirty oil collection system in the underwater oil control cover according to claim 1 is characterized in that: The upper part of the oil control cover is arranged as a conical structure, and the pre-pump filter is located in the conical structure of the oil control cover.

5. The dirty oil collection system in the underwater oil control cover according to claim 3 is characterized in that: The waste oil pump is arranged on the waste oil recovery ship, and one end of the waste oil pump away from the pre-pump filter is connected to the oil remover to separate the waste oil from the seawater.

6. The dirty oil collection system in the underwater oil control cover according to claim 5 is characterized in that: A waste oil tank is provided in the waste oil recovery vessel, and the waste oil tank is connected to the oil outlet of the oil remover so that the separated waste oil can be recovered in the waste oil tank.

7. The dirty oil collection system in the underwater oil control cover according to claim 5 is characterized in that: The drain outlet of the oil skimmer is connected to a drain pipe to discharge the separated seawater back to the sea.

8. A construction method for a dirty oil collection system in an underwater oil control hood, characterized in that: The main steps include: S1. Drive the oil recovery vessel to the vicinity of the oil leakage point of the underwater Christmas tree; S2. Fix the oil control cover to the seabed, and set a pre-pump filter connected to the dirty oil pump in the oil control cover; S3, start the waste oil pump to pump the oily waste water into the deoiler, and the deoiler separates the seawater from the waste oil; S4. The separated waste oil is stored in the waste oil tank, and the seawater is discharged directly into the sea through the drain pipe.

9. The construction method of the dirty oil collection system in the underwater oil control cover according to claim 8 is characterized in that: The oil recovery vessel is provided with a recovery device, which is connected to the oil control cover so that the oil control cover can be recovered to the oil recovery vessel.

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