Exploitation of hydrocarbon fields is characterized by water content increase in the extracted products over the development time. The increase in water cut of the extracted products complicates the operation of field pipelines. The transported products of field are stratified into phases under the influence of low flow rates in pipeline, differences in densities of phase, changes in thermobaric conditions. This leads to the formation of stagnant zones along the pipeline, which intensifies the rate of corrosion processes, causes a decrease in the flow section of pipelines and increases energy consumption for transportation.
The article is devoted to improvement of algorithms for predicting characteristics of the mode of operation of field pipelines in conditions of risk of formation water accumulations. Approach allows for a cost-justify the choice of the optimal period between two cleanings of field pipelines with characteristics of the pipeline section, its profile, and mode of operation, dynamics of formation of water clusters and their impact on pressure losses and the costs of cleaning operation of pipeline. In developing the new approach, the main parameters affecting on formation of water clusters have been identified. Using a dynamic hydraulic simulator, multivariate simulation for selected parameters is performed. On the basis of the array of data obtained, a simplified mathematical model of the process of formation of water clusters in field pipelines is formed. Model allows predicting the volume of water clusters and pressure losses in the pipeline without use of a resource-intensive simulator for dynamic hydraulic modeling. Results of proposed approach for determining the inter-treatment period have been presented by examples in comparison with the previously applied criterion, which took into account only the increase in pressure losses in pipeline.
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