埋地成品油管道泄漏后油品渗流扩散规律

The Oil Seepage and Diffusion in Soil after Oil Leaking from Buried Pipelines

由于管道腐蚀、自然灾害以及第三方破坏,管道泄漏事故频发。为了研究油品在含水土壤中的渗流扩散规律,建立了埋地管道截面区域油品泄漏过程的"泄漏-渗流-扩散"数值模型。基于实际泄漏工况数据,分析了导压系数、泄漏孔大小、泄漏流量、管道直径、泄漏位置、埋深、重力、土壤含水饱和度等影响渗流扩散范围的敏感性。并预测了给定埋地管道条件下,泄漏油品扩散的范围及到达地面的时间。研究结果可为处理埋地管道泄漏事故提供参考。

The diffusion of leaking oil is significant for research on prediction of leakage area and establishment of repairing scheme. This paper builds the prediction model for leakage intensity of pipeline buried in soil and the ＇leakage-seepage-diffusion＂ numerical simulation model. Based on the working data of leakage, the leakage velocity is calculated. The anisotropy of both seepage and diffusion is obtained, including the sensitivity of the water saturation, the porosity, the diffusion resistance, the leakage velocity, the pipeline diameter, the leakage location, and the size of leakage hole on the diffusion area. Based on the distribution of water saturation, this paper predicts the diffusion area of leakage, time of arrival at the land surface and adjacent waters, and the volume of oil leaking into waters. The results can offer reference for disposing of pipeline leakage in aqueous areas.