Abstract
The technology of depressant utilization, which essentially depends on the method of its addition to oil, has a substantial impact on the efficiency of the main pipeline. Direct injection of a pour point depressant into the reservoir enables to maintain optimal conditions for oil processing, namely, to cool the oil at an optimal rate and, which is especially important, in static conditions. But in this case, significant capital investments will be required for mixing devices, devices for cooling oil, for the construction of additional tanks, etc. The addition of pour point directly into the pipeline (before or after the head pumping and heating stations) cannot provide optimal cooling conditions. This process does not significantly improve the rheological properties of oil as compared to the introduction of a depressant directly into the reservoir. The introduction of a pour point depressant directly into the pipeline will significantly reduce capital costs for processing highly paraffinic oil and the advantages of this method are obvious. The proposed method of depressant utilization will reduce their consumption, and energy consumption for heating oil. This goal is achieved by the fact that the pour point depressant is not added to the entire volume of highly paraffinic oil pumped through the pipeline, but only to the annular near-wall layer of oil in the pipe, thus creating a low-viscosity near-wall layer of the pumped highly paraffinic oil. This paper presents a scheme for the implementation of the proposed method and formulas for thermal calculations of the pipeline sections considering depressant addition to oil.
Highlights
Introduction and literature reviewThe technology of depressant utilization, which essentially depends on the method of its addition to oil, has a substantial impact on the efficiency of the main pipeline [1-6]
The first method of depressant addition to oil enables to maintain the optimal conditions of oil treatment with a depressant, i.e. to cool oil at an optimal cooling rate and under static conditions
The use of depressants in pipeline transport of highly paraffinic oils is in most cases less economically profitable compared to other methods [11], for example, with oil preheating before pumping, oil thermal treatment, etc
Summary
Introduction and literature reviewThe technology of depressant utilization, which essentially depends on the method of its addition to oil, has a substantial impact on the efficiency of the main pipeline [1-6]. The first method of depressant addition to oil enables to maintain the optimal conditions of oil treatment with a depressant, i.e. to cool oil at an optimal cooling rate and under static conditions. When a pour point is added directly into the pipeline before or after the head pumping and heating stations, it is not possible to provide optimal cooling conditions, which will somewhat worsen the oil rheological properties. In this case, capital costs will be many times higher than in the first method. Since the advantages of the second method are obvious, only the second method will be considered in this paper
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