油气水混输管道内腐蚀及直接评价方法研究

发布时间：2018-05-06 18:00

本文选题：混输管道 + 多相流　；参考：《西南石油大学》2017年硕士论文

【摘要】：多相流混输技术在油气田的开采中运用的越来越广泛,在油气水混输的介质中气相介质中常常含有CO2、H2S,管道产生内腐蚀是无法避免的,油气混输管道一旦发生腐蚀损坏,将会造成严重的经济损失,并且管道的维修也十分困难。所以有必要及时有效的预测和预防油气混输管道内腐蚀的发生。国内外专家学者已经通过理论及实验,对引起管道内壁腐蚀的机理、多种影响因素进行了大量的研究。本文在大量调研内腐蚀相关文献的基础上,分析油气水混输管道内腐蚀类型、腐蚀机理及影响因素并简要说明了防护方法。论文针对含C02的油气水混输管道内腐蚀及直接评价方法两个问题展开。分别采用了理论分析及数值仿真进行研究。论文主要研究内容如下:运用多相流仿真软件OLGA,收集分析管道相关的运行参数、路由参数及输送介质组分。结合OLGA中的腐蚀模块,分析选择适合油气混输管道的CO2腐蚀预测模型。深入分析管道操作条件中管道出口压力、入口温度、CO2分压、及处理量对内腐蚀速率的影响。管道内介质条件中含水率、气液比及氯离子含量对内腐蚀速率的影响。地形条件中管道的上坡倾角及下坡倾角对内腐蚀速率的影响。以及分析管道类型中不同管道内径对内腐蚀速率的影响。基于灰色关联法,分析温度、压力、CO2分压、PH值、持液率、气体表观速度、液体表观速度、流型、Cl-含量、管道内壁传热系数、气体密度、液体密度、管道倾角、气体对管壁最大剪切力、液体对管壁最大剪切力十五个因素对混输管道内腐蚀速率的影响权重。对于不适合进行内检测的混输管道,有必要对可能发生内腐蚀破坏的管道进行直接评价。本文结合NACE提出的内腐蚀直接评价方法(ICDA),结合实例对油气水混输管道内腐蚀直接评价关键件技术进行研究,确定重点检查的子评价区间,以及子区间中需要详细检测的具体位置。
[Abstract]:Multiphase mixing and transporting technology is more and more widely used in the exploitation of oil and gas fields. Co _ 2C _ 2H _ 2S is often found in the gas-phase medium of oil, gas and water mixed transportation, so the internal corrosion of the pipeline is unavoidable, once the pipeline is corroded and damaged, Will cause serious economic losses, and pipeline maintenance is also very difficult. So it is necessary to predict and prevent the corrosion in oil and gas pipeline. Experts and scholars at home and abroad have done a lot of research on the mechanism and influence factors of pipeline inner wall corrosion through theory and experiment. On the basis of a large number of literatures on internal corrosion, this paper analyzes the corrosion types, corrosion mechanism and influencing factors of oil-gas-water mixed pipeline, and briefly explains the protection methods. In this paper, the internal corrosion and direct evaluation method of C _ 2-containing oil-gas / water mixed pipeline are discussed. Theoretical analysis and numerical simulation are used respectively. The main contents of this paper are as follows: the multiphase flow simulation software OLGA is used to collect and analyze the pipeline operation parameters, routing parameters and transport media components. Combined with the corrosion module in OLGA, the CO2 corrosion prediction model suitable for oil and gas mixed pipeline is analyzed and selected. The effects of outlet pressure, inlet temperature and CO _ 2 partial pressure on internal corrosion rate in pipeline operation were analyzed. The effects of water content, gas / liquid ratio and chloride content on the internal corrosion rate in the medium. The influence of slope dip angle and downslope dip angle on internal corrosion rate in topographic condition. The influence of different inner diameter of pipeline on internal corrosion rate is also analyzed. Based on the grey correlation method, the temperature, pressure, CO _ 2 partial pressure and PH value, liquid holdup, gas apparent velocity, liquid apparent velocity, flow pattern Cl-content, heat transfer coefficient of inner wall of pipe, gas density, liquid density, pipe inclination angle were analyzed. The influence weight of the maximum shear force of gas on the pipe wall and the maximum shear force of liquid on the corrosion rate of the mixed pipeline is fifteen factors. It is necessary to directly evaluate the pipeline which may be damaged by internal corrosion for the mixed pipeline which is not suitable for internal inspection. Combined with the direct evaluation method of internal corrosion put forward by NACE, this paper studies the key part technology of direct evaluation of internal corrosion in oil-gas-water mixed pipeline with practical examples, and determines the sub-evaluation interval of key inspection. And the specific location of the subinterval that needs to be detected in detail.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE988.2

【相似文献】