深水油气田气液混输长输管道水合物生成规律研究

发布时间：2018-07-05 02:53

本文选题：深海温 + 深海长输管线　；参考：《东北石油大学》2017年硕士论文

【摘要】：巴西某深海油气田处于刚刚探明开发方案设计阶段,为减少运行设备降低运营成本,舍弃了 FPSO平台选择井口至海岸的集输方式,但是深海长距离输送面临着深海温度低,管内压力高的影响,使得在输送过程中管道内极易生成水合物,水合物的积累会造成管线堵塞,对管道的安全运行构成了巨大的威胁,因此,针对目标油气田水下长输管线进行水合物的生成预测尤为重要。目前,对于陆地长输管道水合物的预测及防治措施已经相对成熟。但深海长输管道与陆地长输管道之间最大的差别便是存在温度的变化,温度梯度的存在,会影响整个长输管道运行过程中管内流体的流动规律,导致对水合物的生成情况无法准确的预测。本文主要针对存在温度梯度场的情况下,对巴西目标油气田水深1900m直至陆地的长输管道进行水合物预测,应用OLGA全动态数值模拟软件研究在4种温度梯度存在的情况下水合物的生成量及生成位置,并通过对4种情况下水合物生成的最大值位置的生成速率及生成量进行数据监测,研究温度梯度对水合物生成的影响。并且在温度梯度存在的情况下,针对目标油气田不同开采阶段的几种典型输量及含水率进行水合物生成量及生成位置进行预测,并且本文也探索性的研究了气液混输管道输量对水合物生成位置的沉积及冲刷作用。为巴西目标油气田深海长输管道水合物的防治措施的设计具有现实的指导意义。
[Abstract]:A deep sea oil and gas field in Brazil is just in the design stage of proven development plan. In order to reduce the operating equipment and reduce the operating cost, FPSO platform has been abandoned to choose the gathering and transportation mode from the well head to the coast, but the deep-sea long-distance transportation is faced with low deep-sea temperature. The influence of high pressure in the pipe makes it easy to form hydrate in the pipeline during the transportation process. The accumulation of hydrate will cause pipeline blockage and pose a great threat to the safe operation of the pipeline. It is very important to predict the formation of hydrates for long distance underwater pipelines in target oil and gas fields. At present, the prediction and prevention measures of gas hydrate in long distance terrestrial pipeline have been relatively mature. However, the biggest difference between deep-sea long-distance pipeline and land long-distance pipeline is the existence of temperature change, and the existence of temperature gradient will affect the flow of fluid in the whole long distance pipeline. The formation of hydrate can not be accurately predicted. In this paper, based on the existence of temperature gradient field, the hydrate prediction is carried out for the pipeline with a depth of 1900 m to the land in the target oil and gas field in Brazil. The formation and location of hydrates in the presence of four temperature gradients were studied by using OLGA full dynamic numerical simulation software, and the formation rate and formation amount of the maximum position of hydrate formation under four conditions were monitored. The effect of temperature gradient on hydrate formation was studied. Under the condition of the existence of temperature gradient, the hydrate formation quantity and the formation position of the gas hydrate are predicted according to several typical transportation and water cut in different production stages of the target oil and gas field. The deposition and scour of gas-liquid mixed pipeline on hydrate formation position are also studied in this paper. It has practical guiding significance for the design of hydrates prevention measures for deep sea long distance pipeline in Brazil's target oil and gas fields.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE832

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