The operation equipment in the well site of salt cavern gas storage is complicated. The potential leakage sources, such as wellhead, valve group and pipelines, are widely distributed, so the probability of micro-leakage events in the well site is very large under the long-term gas injection and production conditions. Aiming at the characteristics of well site layout and the existing problems of present gas detectors, such as low accuracy, multiple points, environmental influencing factors and poor stability, a high-precision monitoring and point location optimization method for natural gas micro-leakage at the well site was proposed. Firstly, an opposite-beam laser methane detector was selected after compared with different combustible gas monitoring methods, and used to monitor the gas micro-leakage at the key zones of well site which have the most probable leakage in real time. Then, a micro-leakage monitoring probability simulation model was established and the gas leakage diffusion law in the well site under different conditions were studied, such as different wind directions, wind speeds, gas leakage points and leakage rates. Finally, a high-precision monitoring method and a point location optimization scheme were proposed under the constraint conditions of economy and monitoring probability after compared with different layout paths. The detecting precision of leak gas concentration can be up to 1.0 ppm m after the improvement of the model. The real-time monitoring and effective early warning of micro-leakage in the well site of salt cavern gas storage can be realized, which can effectively reduce the risk of leakage event after the failure of gas storage leak proofness and ensure the long-term safety monitoring and efficient operation for salt cavern gas storage.

中文翻译：

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盐穴储气库井场天然气微泄漏高精度监测及点位优化方法

盐穴储气库井场作业设备复杂。井口、阀组、管道等潜在泄漏源分布广泛，在长期注采条件下，井场发生微泄漏事件的概率很大。针对井场布置特点以及现有气体检测仪存在的精度低、点位多、环境影响因素大、稳定性差等问题，提出了一种井场天然气微泄漏高精度监测及点位优化方法。提出了井址。首先，通过对不同可燃气体监测方法的比较，选择对射激光甲烷检测仪，用于对井场最有可能泄漏的关键区域进行瓦斯微泄漏实时监测。然后建立微泄漏监测概率模拟模型，研究不同风向、风速、瓦斯泄漏点和泄漏率等条件下井场瓦斯泄漏扩散规律。最后，在经济性和监测概率约束条件下，与不同布设路径进行比较，提出了高精度监测方法和点位优化方案。模型改进后，泄漏气体浓度检测精度可达1.0 ppm·m。可实现盐穴储气库井场微泄漏的实时监测和有效预警，可有效降低储气库防漏失效后发生泄漏事件的风险，确保长期安全盐穴储气库的监测和高效运行。