Simulation device and method for detecting corrosion of oil-water interface of multi-phase mixed transportation pipeline online

Abstract

The invention relates to a simulation device and method for detecting the corrosion of an oil-water interface of a multi-phase mixed transportation pipeline online. The device comprises an H-type oil-water interface corrosion simulation electrolytic cell, a corrosion testing system, a liquid level control system and a circulating water bath heating system, wherein the H-type oil-water interface corrosion simulation electrolytic cell is used for simulating complicated corrosion reaction of the oil-water interface; the corrosion testing system is used for carrying out a corrosion weight loss test and an electrochemical test on the oil-water interface of the H-type oil-water interface corrosion simulation electrolytic cell; the liquid level control system is used for adjusting a liquid leveldifference of the oil-water interface in the H-type oil-water interface corrosion simulation electrolytic cell according to experiment requirements; and the circulating water bath heating system is used for heating the H-type oil-water interface corrosion simulation electrolytic cell to reach pre-set temperature. Therefore, the device has very great significance on researches of oil-water interface corrosion and protection technologies of the deep water multi-phase mixed transportation pipeline.

Description

technical field [0001] The invention relates to the field of multiphase flow corrosion risk assessment and protection of deep water pipelines, in particular to an online detection device and method for multiphase mixed pipeline oil-water interface corrosion simulation. Background technique [0002] In recent years, with the increasing prosperity of offshore oil and gas field development, many failure accidents have occurred in submarine pipelines. In view of the characteristics of oil-water two-phase conditions with high corrosion risks in deep-water oil pipelines, the water-phase corrosion at the bottom of the pipeline and the oil-water two-phase interface corrosion There are also many research methods and means of typical risks. However, so far, the corrosion simulation of oil-water two-phase mixed pipelines in oil fields still needs to be improved. [0003] At present, the more commonly used method is to use high-temperature and high-pressure reactors to simulate the oil...

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Problems solved by technology

However, so far, the corrosion simulation of oil-water two-phase mixed pipelines in oil fields still needs to be improved.

[0003] At present, the more commonly used method is to use high-temperature and high-pressure reactors to simulate the oil-water two-phase mixed transportation environment of deep-water oil pipelines, and use stirring in the reactor to simulate the corrosion effect of different flow rates on metals. Laminar flow state is simulated, and there is no intuitive research on the corrosion mechanism of the oil-water interface; the other is to use the corrosion simulation loop device to study the influence of multiphase flow flow patterns or wetting characteristics on the corrosion behavior of pipes, but it is limited by actual factors. Due to the complex flow pattern in the loop, it is difficult to realize the simulation process of a stable laminar flow state, and there is a lack of intuitive and accurate research on the corrosion behavior and mechanism of the oil-water interface; moreover, the operation and maintenance of the large-scale oil-gas-water multiphase flow loop corrosion simulation device The force is large, and it consumes a lot of manpower and material resources, which has also become one of the factors restricting the exploration of the law of multiphase flow corrosion.

In addition, domestically, a small electrolytic cell is used to simulate the alternate wetting state of oil and water, but it is driven by a stepping motor, which has problems such as slow start and lost steps. The stepping motor adopts open-loop control, which makes it difficult to accurately control the liquid level ; and it uses a single electrolytic cell, the vibration generated by the stepping motor will directly affect the fluctuation of the liquid level, further affecting the formation of the corrosion product film and the electrochemical test process; at the same time, because the electrochemical test is too general, the corrosion mechanism of the oil-water interface is lacking. systematic research

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