深层天然气扩散系数模拟实验装置的研制

The development of an experimental measuring apparatus for simulating the diffusion coefficient of naturalgas in depth

为了更准确地测定烃类气体在岩石中的扩散系数,为评价天然气藏的散失与保存评价提供参数,研制了深层天然气扩散系数模拟实验装置。文章介绍了装置的硬件结构、技术参数、实验流程等,以寒武系牛蹄塘组页岩、二叠系茅口组致密灰岩等样品为例,进行高温、高压条件下岩石的扩散系数模拟实验,计算了它们的扩散系数。研究结果表明,该深层天然气扩散系数模拟实验装置测试数据可靠,为研究深层天然气保存条件评价提供了技术手段。

In order to measure the diffusion coefficient of hydrocarbon gases in rocks more accurately and provide parameters for the evaluation of the loss and preservation of natural gas accumulations,the authors developed an experiment apparatus to simulate the diffusivity of natural gas in depth.The hardware structure,technical parameters of the apparatus and the experimental flow for simulating the deep natural gas diffusion coefficient were described.Taking the shale of Cambrian Niutitang formation and the dense limestone of Permian Maokou formation as examples,the authors simulated the natural gas diffusion in rocks under high temperature and high pressure,and calculated their diffusion coefficients.The results show that the test data of the deep natural gas diffusion coefficient are reliable by using the apparatus,which provides a technical means for the evaluation of deep gas preservation conditions.