摘要
单相渗流、总吸附水量相关法不能够模拟气水两相渗流,为此,建立了气水两相渗流模型,分析了气体钻井过程中当地层存在气饱和砂岩、气饱和泥页岩夹层时泥页岩的自发吸水规律。采用有限差分法对所建模型进行了求解,并绘制了含水饱和度、孔隙水压力和孔隙气压力的时空分布曲线。对比垂直向上、向下自发吸水规律可知,重力作用可以忽略不计,将计算的吸水质量与试验结果进行对比,结果较为吻合,从而验证了所建模型的正确性。
Single phase flow and total water absorption method can＇t simulate the water-gas two phase flow, therefore a water-gas two-phase flow model is established. During gas drilling when there are gas saturated sandstone and gas-saturated shale in the formation, the shale spontaneous water imbibition was analyzed. The model is solved using finite difference method. The profiles of water saturation, pore pres sure and gas pressure were plotted. Comparisons between vertical upward and downward spontaneous wa ter imbibition indicate that gravity is negligible. The agreement between the calculated and experimental results shows that the model is very good.
出处
《石油钻探技术》
CAS
北大核心
2009年第6期31-34,共4页
Petroleum Drilling Techniques
基金
国家高技术研究发展计划("863"计划)项目"气体钻井技术与装备"(编号:2006AA06A103)部分研究内容
