Corrosion protection method for beach oilfield pipeline

Abstract

The invention provides a corrosion protection method for a beach oilfield pipeline, and belongs to the field of pipeline corrosion prevention. According to the technical scheme, the method comprises the following steps that S1, a nano material and an organic solvent are mixed in a mixing tank according to the proportion, and an anti-corrosion coating solution is formed; s2, the anti-corrosion coating solution in the step S2 is evenly sprayed on the inner wall of the pipeline through a spraying mechanism, and a nanometer material protection layer is formed; and S3, alternately washing seawater and fresh water on the nano-material protection layer on the inner wall of the pipeline by using a circulating mechanism, and accelerating the fixation of the nano-material protection layer. The invention has the following beneficial effects: the protective film prepared from the nano material has high stability, can protect the pipeline for a long time, can effectively reduce the corrosion rate of the surface of the inner wall of the pipeline, prolongs the service life of the pipeline, and accelerates the fixation of the nano protective layer by alternately washing the nano material with seawater and fresh water.

Description

Technical Field

[0001] The invention relates to the field of pipeline anticorrosion, and in particular to a corrosion protection method for pipelines in offshore oil fields. Background Art

[0002] Pipeline corrosion is a serious problem in offshore oilfield production. Due to the presence of salt and sulfur compounds in the marine environment, pipelines will gradually corrode, causing the pipeline wall to become thinner and eventually rupture, resulting in accidents such as oil and gas leakage. At present, the traditional pipeline corrosion protection method is mainly spraying anti-corrosion paint and coating, but these methods have problems such as short service life, easy detachment of coating, and high cost. Summary of the invention

[0003] The purpose of the present invention is to provide a protective film made of nanomaterials with high stability, which can protect pipelines for a long time, effectively reduce the corrosion rate of the inner wall surface of the pipeline, and increase the service life of the pipeline. At the same time, seawater and fresh water are used to alternately flush the nanomaterials to accelerate the fixation of the nano protective layer, which is used for corrosion protection of offshore oil field pipelines.

[0004] The present invention is achieved by the following measures: A corrosion protection method for a beach oil field pipeline, characterized in that it comprises the following steps: S1. Mixing the nanomaterial and the organic solvent in a mixing tank according to a certain proportion to form an anti-corrosion coating solution; S2, using a spraying mechanism to evenly spray the anti-corrosion coating solution in step S1 onto the inner wall of the pipeline to form a nano material protective layer; S3. Use a circulation mechanism to alternately flush seawater and fresh water onto the nanomaterial protective layer on the inner wall of the pipe to accelerate the fixation of the nanomaterial protective layer.

[0005] The specific features of the present invention also include: The nano material is any one of copper oxide, aluminum oxide, zinc oxide, nano silver, nano carbon tube or nano polymer.

[0006] The organic solvent is any one of N,N-dimethylformamide (DMF), ethanol, methanol and acetone.

[0007] The amount of the nano material used is 1% to 5% of the amount of the organic solvent used.

[0008] In step S1, the nanomaterial and the organic solvent are placed in a mixing tank and mixed by a stirrer; A driving motor is arranged on the top of the mixing tank, the motor shaft end of the driving motor is arranged inside the mixing tank, and the agitator is arranged thereon, a feeding port and an exhaust port are arranged on the top of the mixing tank, and a discharging port is arranged on the bottom of the mixing tank.

[0009] The spraying mechanism comprises a high-pressure pump, a high-pressure hose is provided at the discharge end of the high-pressure pump, a feed hose is provided at the feed end of the high-pressure pump, a filter and a stop valve are provided on the high-pressure hose, and a high-pressure spray gun is provided at the end of the high-pressure hose; Preferably, the nozzle of the high-pressure spray gun has a porous structure to ensure that the solution is evenly sprayed on the inner wall surface of the pipeline. At the same time, the high-pressure spray gun can also rotate and move to conveniently cover the entire inner wall surface of the pipeline.

[0010] The circulation mechanism comprises a fresh water tank, a sea water tank and a water pump; By using the circulation device, fresh water and sea water are used to alternately flush the inner wall surface of the pipeline, so as to fix the nano material protective layer. Flushing with fresh water can clean the inner wall surface of the pipeline and remove possible sediments and impurities. At the same time, flushing with sea water can provide an environment with suitable salinity and pH value to help fix the nano material protective layer, so as to maintain the effectiveness of the protective layer.

[0011] The beneficial effects of the present invention are as follows: the protective film prepared by the nano material of the present invention has high stability, can protect the pipeline for a long time, can effectively reduce the corrosion rate of the inner wall surface of the pipeline, and improve the service life of the pipeline. At the same time, the nano material is alternately flushed with sea water and fresh water, which accelerates the fixation of the nano protective layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of a mixing tank in an embodiment of the present invention.

[0013] Figure 2 Schematic diagram of the structure of the spraying mechanism in the embodiment of the present invention.

[0014] Among them, the figures are marked as: 1. driving motor; 2. feeding port; 3. exhaust port; 4. mixing tank; 5. agitator; 6. high-pressure hose; 7. high-pressure spray gun; 8. high-pressure pump. DETAILED DESCRIPTION

[0015] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0016] Example 1 See also Figure 1 and 2 , a corrosion protection method for offshore oil field pipelines, comprising the following steps: S1. Place copper oxide nanoparticles and N,N-dimethylformamide (DMF) in a mixing tank according to a certain proportion, and stir for 2 hours to fully mix them to form an anti-corrosion coating solution; S2, using a spraying mechanism to evenly spray the anti-corrosion coating solution in step S1 onto the inner wall of the pipeline to form a nanomaterial protective layer; S3. Use a circulation mechanism to alternately flush seawater and fresh water onto the nanomaterial protective layer on the inner wall of the pipe to accelerate the fixation of the nanomaterial protective layer.

[0017] The nano material is any one of copper oxide, aluminum oxide, zinc oxide, nano silver, nano carbon tube or nano polymer.

[0018] The organic solvent is any one of N,N-dimethylformamide (DMF), ethanol, methanol and acetone.

[0019] The amount of the nano material used is 1% to 5% of the amount of the organic solvent used.

[0020] In step S1, the nanomaterial and the organic solvent are placed in a mixing tank and mixed by a stirrer; A driving motor is arranged on the top of the mixing tank, the motor shaft end of the driving motor is arranged inside the mixing tank, and the agitator is arranged thereon, a feeding port and an exhaust port are arranged on the top of the mixing tank, and a discharging port is arranged on the bottom of the mixing tank.

[0021] The spraying mechanism comprises a high-pressure pump, a high-pressure hose is provided at the discharge end of the high-pressure pump, a feed hose is provided at the feed end of the high-pressure pump, a filter and a stop valve are provided on the high-pressure hose, and a high-pressure spray gun is provided at the end of the high-pressure hose; Preferably, the nozzle of the high-pressure spray gun has a porous structure to ensure that the solution is evenly sprayed on the inner wall surface of the pipeline. At the same time, the high-pressure spray gun can also rotate and move to conveniently cover the entire inner wall surface of the pipeline; The spraying device uses a high-pressure pump and a spray gun. The high-pressure pump delivers the anti-corrosion coating solution to the spray gun at a pressure of 5MPa. The nozzle of the spray gun has a porous structure to ensure that the solution is evenly sprayed on the inner wall surface of the pipe. At the same time, the spray gun can rotate and move to cover the entire inner wall surface of the pipe. After the spraying is completed, the inner wall surface of the pipe is rotated so that the solution evenly covers the entire inner wall surface of the pipe. After the solution dries, a copper oxide protective layer with a thickness of 10 microns is formed.

[0022] The circulation mechanism comprises a fresh water tank, a sea water tank and a water pump; By using the circulation device, fresh water and sea water are used to alternately flush the inner wall surface of the pipeline, so as to fix the nano material protective layer. Flushing with fresh water can clean the inner wall surface of the pipeline and remove possible sediments and impurities. At the same time, flushing with sea water can provide an environment with suitable salinity and pH value to help fix the nano material protective layer, so as to maintain the effectiveness of the protective layer.

[0023] Example 2 A corrosion protection method for offshore oilfield pipelines comprises the following steps: S1. Mixing the nanomaterial and the organic solvent in a mixing tank according to a certain proportion to form an anti-corrosion coating solution; S2, using a spraying mechanism to evenly spray the anti-corrosion coating solution in step S1 onto the inner wall of the pipeline to form a nano material protective layer; S3. Use a circulation mechanism to alternately flush seawater and fresh water onto the nanomaterial protective layer on the inner wall of the pipe to accelerate the fixation of the nanomaterial protective layer.

[0024] Example 3 See also Figure 1 and 2 , a corrosion protection method for offshore oil field pipelines, comprising the following steps: S1. Mixing the nanomaterial and the organic solvent in a mixing tank according to a certain proportion to form an anti-corrosion coating solution; S2, using a spraying mechanism to evenly spray the anti-corrosion coating solution in step S1 onto the inner wall of the pipeline to form a nano material protective layer; S3. Use a circulation mechanism to alternately flush seawater and fresh water onto the nanomaterial protective layer on the inner wall of the pipe to accelerate the fixation of the nanomaterial protective layer.

[0025] The nano material is any one of copper oxide, aluminum oxide, zinc oxide, nano silver, nano carbon tube or nano polymer.

[0026] The organic solvent is any one of N,N-dimethylformamide (DMF), ethanol, methanol and acetone.

[0027] The amount of the nano material used is 1% to 5% of the amount of the organic solvent used.

[0028] In step S1, the nanomaterial and the organic solvent are placed in a mixing tank and mixed by a stirrer; A driving motor is arranged on the top of the mixing tank, the motor shaft end of the driving motor is arranged inside the mixing tank, and the agitator is arranged thereon, a feeding port and an exhaust port are arranged on the top of the mixing tank, and a discharging port is arranged on the bottom of the mixing tank.

[0029] The spraying mechanism comprises a high-pressure pump, a high-pressure hose is arranged at the discharge end of the high-pressure pump, a feed hose is arranged at the feed end of the high-pressure pump, a filter and a stop valve are arranged on the high-pressure hose, and a high-pressure spray gun is arranged at the end of the high-pressure hose.

[0030] Controlled Experimental Design: Two sections of pipes made of the same material were selected as experimental objects and randomly divided into two groups. The length of each pipe was 100 meters and the diameter was 10 centimeters. The pipes in the control group were not treated in any way and were naturally exposed to the actual use environment; the inner wall surface of the pipes in the experimental group was sprayed with a nanomaterial protective layer using the above method and fixed using a circulation device.

[0031] Before and after the experiment, the corrosion degree of the inner wall surfaces of the two groups of pipes was tested and the results were recorded.

[0032] During the experiment, the two groups of pipelines were subjected to the same use and maintenance operations, including the same fluid medium, temperature and pressure.

[0033] Experimental group: Method for fixing the protective layer of nanomaterials using a circulation device Pipeline length: 100 meters; Cycle time: 30 minutes; Fresh water flow rate: 1.5L / min; Seawater flow rate: 0.5L / min; Nano material protective layer thickness: 10 microns; Experimental period: 30 days; Control group: natural fixation method; Pipeline length: 100 meters; No fixation methods were used; Experimental period: 30 days; After the experimental period, we can conduct a comparative analysis of the two groups of samples to prove that the method of fixing the nanomaterial protective layer by the circulation device is superior to the natural fixation method. The specific analysis may include the following aspects: 1. Corrosion of the inner wall surface of the pipeline: The corrosion of the inner wall surface of the pipeline was measured by electrochemical testing and other methods, and the corrosion rate and degree of the two groups of samples were compared to prove that the method of fixing the nanomaterial protective layer in the circulation device can significantly slow down the corrosion rate of the inner wall of the pipeline.

[0034] 2. Pipeline service life: Compare the service life of the two groups of samples to prove that the method of fixing the nanomaterial protective layer in the circulation device can significantly extend the service life of the pipeline.

[0035] 3. Economic benefits: Compare the costs and benefits of the two methods to prove that the method of fixing the nanomaterial protective layer in a circulating device can be more economically advantageous.

[0036] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A corrosion protection method for offshore oilfield pipelines, characterized in that: The following steps are involved: S1. Mixing the nanomaterial and the organic solvent in a mixing tank according to a certain proportion to form an anti-corrosion coating solution; S2, using a spraying mechanism to evenly spray the anti-corrosion coating solution in step S1 onto the inner wall of the pipeline to form a nano material protective layer; S3. Use a circulation mechanism to alternately flush seawater and fresh water onto the nanomaterial protective layer on the inner wall of the pipe to accelerate the fixation of the nanomaterial protective layer.

2. The corrosion protection method for offshore oilfield pipelines according to claim 1, characterized in that: The nano material is any one of copper oxide, aluminum oxide, zinc oxide, nano silver, nano carbon tube or nano polymer.

3. The corrosion protection method for offshore oilfield pipelines according to claim 1, characterized in that: The organic solvent is any one of N,N-dimethylformamide (DMF), ethanol, methanol and acetone.

4. The corrosion protection method for offshore oilfield pipelines according to claim 1, characterized in that: The amount of the nano material used is 1% to 5% of the amount of the organic solvent used.

5. The corrosion protection method for offshore oilfield pipelines according to claim 1, characterized in that: In step S1, the nanomaterial and the organic solvent are placed in a mixing tank and mixed by a stirrer.

6. The corrosion protection method for offshore oilfield pipelines according to claim 1, characterized in that: A driving motor is arranged on the top of the mixing tank, the motor shaft end of the driving motor is arranged inside the mixing tank, and the agitator is arranged thereon, a feeding port and an exhaust port are arranged on the top of the mixing tank, and a discharging port is arranged on the bottom of the mixing tank.

7. The corrosion protection method for offshore oilfield pipelines according to claim 1, characterized in that: The spraying mechanism comprises a high-pressure pump, a high-pressure hose is arranged at the discharge end of the high-pressure pump, a feed hose is arranged at the feed end of the high-pressure pump, a filter and a stop valve are arranged on the high-pressure hose, and a high-pressure spray gun is arranged at the end of the high-pressure hose.

8. The corrosion protection method for offshore oilfield pipelines according to claim 1, characterized in that: The circulation mechanism comprises a fresh water tank, a sea water tank and a water pump.

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