Marine riser and expansion bend inner surface spraying system and spraying process method

Abstract

The invention discloses a marine riser and expansion bend inner surface spraying system and a spraying process method. The system comprises a plurality of groups of coating conveying units, an umbilical tube injection and recovery unit and a spraying unit, the paint conveying unit comprises a storage tank, a plunger pump and a branching device which are connected in sequence; one outlet of the branching device is connected with the material storage tank, the other outlet of the branching device passes through a material conveying pipe, and the material conveying pipes of all the paint conveying units are inserted into the umbilical cord pipe; the umbilical tube is wound on the umbilical tube roller; the other end of the umbilical tube penetrates through the umbilical tube injection and recovery unit and then is connected with the spraying unit; the spraying process method comprises the steps of spraying system debugging, spraying unit injection, primary spraying in the pipeline, secondary spraying in the pipeline and the like. The service life of the old submarine pipeline is effectively prolonged, long-period safe operation of an oil field is guaranteed, investment is reduced, and the yield is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas field development, and in particular relates to a spraying system and a spraying process method for the inner surface of a marine riser and an expansion bend. Background Art

[0002] For submarine pipelines with high safety operation risks, the inner wall corrosion repair technology can not only prevent the continuation of internal corrosion, but also strengthen the pipeline to a certain extent, extend the service life of the submarine pipeline, and significantly reduce conventional operation and maintenance technologies, such as internal detection technology, corrosion inhibitor and scale inhibitor injection, etc., effectively ensuring the long-term safe operation of the oil field. The pipeline repair process replaces the pipeline replacement process, and the oil field shutdown cycle is significantly shortened, and the maintenance cost of the submarine pipeline is significantly reduced.

[0003] At present, due to the particularity of the laying process, there is no coating system on the inner wall of the submarine pipeline. The most effective way to prevent corrosion of the inner wall of the submarine pipeline is to add an internal coating system. How to form a continuous and complete coating system on the inner wall of the submarine pipeline riser is an important technical means to ensure that the riser can continue to be used, and it is also an important part of the integrity of the entire submarine pipeline transportation system. Summary of the invention

[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a spraying system and a spraying process method for the inner surface of a marine riser and an expansion bend.

[0005] The present invention is achieved through the following technical solutions:

[0006] A system for spraying the inner surface of a marine riser and an expansion bend, comprising a plurality of groups of paint delivery units, an umbilical tube injection and recovery unit and a spray unit; the paint delivery unit comprises a storage tank, a plunger pump and a splitter connected in sequence; one outlet of the splitter is connected to the storage tank through an overflow pipe, and the other outlet thereof is through a delivery pipe; the delivery pipes of all paint delivery units are inserted into an umbilical tube; the umbilical tube is wound around an umbilical tube drum; the other end of the umbilical tube passes through an umbilical tube injection and recovery unit and is then connected to a spray unit; the spray unit comprises a mixer and a nozzle, the inlet of the mixer is connected to the delivery pipes of all paint delivery units, and the outlet of the mixer is connected to the nozzle; the umbilical tube injection and recovery unit comprises an injection and recovery mechanism and a guide mechanism.

[0007] In the above technical solution, a pressure gauge and a flow meter are arranged in sequence on the pipeline between the plunger pump and the splitter according to the direction of liquid flow.

[0008] In the above technical solution, a safety valve is provided on the overflow pipe.

[0009] In the above technical solution, the feed pipe and the umbilical tube are connected via a sliding joint.

[0010] In the above technical solution, the guide mechanism is fixed to the top of the injection recovery mechanism, and the bottom of the injection recovery mechanism is rigidly connected to the riser.

[0011] In the above technical solution, the guide mechanism is a guide rail structure bent in a right angle shape, and the bend has a smooth transition.

[0012] A spraying process method for a marine riser and an expansion bend inner surface spraying system, comprising the following steps:

[0013] S1. Spraying system debugging

[0014] Before the nozzle is lowered into the riser and expansion bend, the plunger pump is turned on to allow multiple groups of components to pass through the paint delivery unit and reach the nozzle through the mixer. During the debugging process, the gas in the pipeline is discharged so that the multiple groups of components are fully mixed and evenly thrown out from the nozzle;

[0015] S2, spray unit injection

[0016] The spray unit is injected into the recovery unit through an umbilical pipe and enters the opening of the riser, passes through the riser and the expansion elbow, and reaches the horizontal pipeline;

[0017] S3, first spraying inside the pipeline

[0018] According to the coating thickness requirements, the motor speed is set, and then the recovery speed of the spray unit is adjusted. The internal spraying operation starts during the horizontal pipeline pulling back, so that the inner surface of the expansion elbow and the riser are evenly covered with the coating. When the nozzle returns to the riser outlet, one spraying is completed;

[0019] S4. Spray the inside of the pipe again

[0020] According to the coating requirements, after the coating is dry, repeat steps S1 to S3 to spray again.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides a system and a method for spraying the inner surface of a marine riser and an expansion bend, which realizes the coating repair operation of the inner surface of the marine riser and the expansion bend, and can perform in-situ repair of the marine riser and the expansion bend whose corrosion margin is close to the threshold, replacing the traditional replacement of the riser or the expansion bend, effectively increasing the service life of old submarine pipelines, ensuring the long-term safe operation of the oil field, reducing investment, and ensuring production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] in:

[0025] 1. Storage tank; 2. Piston pump; 3. Pressure gauge; 4. Flow meter; 5. Divider; 6. Overflow pipe; 7. Safety valve; 8. Feed pipe; 9. Umbilical tube roller; 10. Umbilical tube; 11. Mixer; 12. Nozzle; 13. Guide mechanism; 14. Injection recovery unit; 15. Riser; 16. Expansion elbow; 17. Horizontal pipe

[0026] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0028] like Figure 1 As shown, a marine riser and expansion bend inner surface spraying system comprises a plurality of coating delivery units, a spraying unit and an umbilical pipe injection and recovery unit;

[0029] The paint delivery unit comprises a material storage tank 1, a plunger pump 2 and a splitter 5 which are sequentially connected by pipelines, and a pressure gauge 3 and a flow meter 4 are sequentially arranged on the pipeline between the plunger pump 2 and the splitter 5 according to the direction of liquid flow; one outlet of the splitter 5 is connected to the material storage tank 1 through an overflow pipe 6, and a safety valve 7 is arranged on the overflow pipe 6; the other outlet of the splitter 5 is connected to a delivery pipe 8; the delivery pipes 8 of all paint delivery units are inserted into an umbilical tube 13; the umbilical tube 13 is wound on an umbilical tube roller 9; the delivery pipe 8 is connected to the umbilical tube 10 through a sliding joint; the other end of the umbilical tube 13 passes through the umbilical tube and is injected into the recovery unit to form a rear connection spray unit;

[0030] The paint delivery unit turns on the plunger pump and uses pressurized air as the power to pump the paint in the storage tank into the flexible umbilical tube through the flow meter, splitter, and sliding joint. The paint consists of two components, which are transported by two pipelines respectively and transported independently before entering the mixer and spraying. When the instantaneous pressure is too high, reflux is achieved through the safety valve and overflow pipe.

[0031] The spraying unit includes a mixer 11 and a spray head 12, the inlet of the mixer 11 is connected to the feed pipes 8 of all the paint delivery units, and the outlet of the mixer 11 is connected to the spray head 12;

[0032] In this embodiment, two sets of paint delivery units are provided. The spray unit first drives the internal delivery pipe to deliver components A and B through the umbilical tube to mix in the mixer. The nozzle has micropores. After the paint hits, the nozzle rotates. While rotating, the nozzle evenly sprays the mixed paint on the inner surface of the pipeline.

[0033] The umbilical tube injection recovery unit comprises a guide mechanism 13 and an injection recovery mechanism 14;

[0034] The guide mechanism is fixed to the top of the injection recovery mechanism, and the bottom of the injection recovery mechanism is rigidly connected to the standpipe 15;

[0035] The guide mechanism 13 is a guide rail structure that is bent at a right angle, and the bend is smoothly transitioned. The umbilical tube 10 passes through the guide mechanism 13 to achieve the conversion from horizontal to vertical. After the umbilical tube 10 vertically passes through the injection recovery mechanism 14, it vertically enters the riser 15, passes through the expansion elbow 16, and reaches the horizontal tube 17; the guide mechanism 13 can be any structure that can achieve direction conversion, such as a frame structure, etc.

[0036] The injection recovery mechanism 14 is a clamping device. The injection recovery mechanism 14 drives the motor through the motor control module. The motor adopts a stepping motor. The motor keeps synchronous operation. The motor drives the clamping block to reciprocate and rotate. The friction between the clamping block and the umbilical tube is relied on to realize the injection / recovery of the umbilical tube.

[0037] The injection recovery mechanism 14 is a conventional commercially available device, and any device that can achieve the clamping function can be applied to this application, such as the HR-5100 model product of the foreign NOV Hydra Rig company and the ZRT540 model developed by the domestic Hongyuan Petroleum Equipment Company. Both devices can meet the requirements of this application.

[0038] Example 2

[0039] A spraying process method using the marine riser and expansion bend inner surface spraying system of Example 1 comprises the following steps:

[0040] S1: Debugging the spraying system. Before the nozzle is lowered into the riser and expansion bend, start the plunger pump to allow components A and B to pass through the paint delivery unit and reach the nozzle through the mixer. During the debugging process, exhaust the gas in the pipeline so that components A and B are fully mixed and evenly thrown out from the spraying location.

[0041] S2: Spray unit injection, using the umbilical pipe injection / recovery unit to inject the spray unit from the riser opening, pass through the riser and expansion elbow, and reach the horizontal pipeline.

[0042] S3: The first spraying is the spraying inside the pipeline. According to the thickness requirements of the coating, the recovery speed of the drive motor is set. The internal spraying operation starts during the horizontal pipeline pulling back, so that the inner surface of the expansion elbow and the riser are evenly covered with the coating. When the nozzle returns to the riser outlet, one spraying is completed.

[0043] S4: The second / third coat of spraying, according to the coating requirements, after the coating surface is dry, refer to S1, S2, S3 to implement the second / third coat of coating.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0046] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A marine riser and expansion bend inner surface spraying system, characterized in that: The invention comprises a plurality of paint delivery units, an umbilical tube injection recovery unit and a spraying unit; the paint delivery unit comprises a material storage tank (1), a plunger pump (2) and a splitter (5) which are connected in sequence; one outlet of the splitter (5) is connected to the material storage tank (1) through an overflow pipe (6), and the other outlet thereof is connected to a material delivery pipe (8); The feed pipes (8) of all paint delivery units are inserted into the umbilical tube (10); the umbilical tube (10) is wound around the umbilical tube roller (9); the other end of the umbilical tube (10) passes through the umbilical tube and is injected into the recovery unit to form a rear connection spraying unit; The spraying unit comprises a mixer (11) and a spray head (12), wherein the inlet of the mixer (11) is connected to the feed pipes (8) of all the paint delivery units, and the outlet of the mixer (11) is connected to the spray head (12); The umbilical tube injection recovery unit comprises an injection recovery mechanism (14) and a guide mechanism (13).

2. The marine riser and expansion bend inner surface spraying system according to claim 1, characterized in that: A pressure gauge (3) and a flow meter (4) are arranged in sequence on the pipeline between the plunger pump (2) and the splitter (5) according to the direction of liquid flow.

3. The marine riser and expansion bend inner surface spraying system according to claim 1, characterized in that: A safety valve (7) is provided on the overflow pipe (6).

4. The marine riser and expansion bend inner surface spraying system according to claim 1, characterized in that: The feed pipe (8) and the umbilical tube (10) are connected via a sliding joint.

5. The marine riser and expansion bend inner surface spraying system according to claim 1, characterized in that: The guide mechanism is fixed to the top of the injection recovery mechanism, and the bottom of the injection recovery mechanism is rigidly connected to the standpipe (15).

6. The marine riser and expansion bend inner surface spraying system according to claim 1, characterized in that: The guide mechanism (13) is a guide rail structure that is bent into a right angle, and the bend has a smooth transition.

7. A spraying process using the spraying system for the inner surface of a marine riser and an expansion bend according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Spraying system debugging Before the nozzle is lowered into the riser and expansion bend, turn on the plunger pump to allow multiple groups of components to pass through the paint delivery unit and reach the nozzle through the mixer. During the debugging process, exhaust the gas in the pipeline so that the multiple groups of components are fully mixed and evenly thrown out from the nozzle; S2, spray unit injection The spray unit is injected into the recovery unit through an umbilical pipe and enters the opening of the riser, passes through the riser and the expansion elbow, and reaches the horizontal pipeline; S3, first spraying inside the pipeline According to the coating thickness requirements, the motor speed is set, and then the recovery speed of the spray unit is adjusted. The internal spraying operation starts during the horizontal pipeline pulling back, so that the inner surface of the expansion elbow and the riser are evenly covered with the coating. When the nozzle returns to the riser outlet, one spraying is completed; S4. Spray the inside of the pipe again According to the coating requirements, after the coating is dry, repeat steps S1 to S3 to spray again.

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