相态变化对气藏流体结垢的影响  

An influence of phase behavior changes on scale formation in fluids of gas reservoirs

作　　者：李丽[1] 刘建仪[1] 张威 张广东[1] 李超 叶长青 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]陕西核工业工程勘察院,陕西西安710000 [3]西部钻探吐哈钻井公司,新疆哈密838200 [4]中国石油西南油气田公司采气工程研究院,四川广汉638000

出　　处：《石油学报》2012年第5期864-870,共7页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.50604011)资助

摘　　要：采用高温、高压地层流体无机盐结垢综合测试装置,结合建立的多相平衡结垢预测模型,对实际气藏流体的无机盐结垢规律进行了研究,重点分析了气藏及井筒中不同位置处相态变化对无机盐结垢的影响。研究结果表明,地层水的蒸发及酸性气体的溶解、析出是无机盐结垢程度的主要相态影响因素。实际气藏流体的无机盐结垢情况是流体各组分相态变化和化学反应的综合结果。地层流体的相态变化及无机盐结垢规律在地层中主要受地层压力的影响,在井筒中主要受温度的影响。不考虑相态变化将导致无机盐结垢量的预测值明显偏低,且随压力降低和温度增加,预测偏差不断增大。Combined a scaling prediction model for multiphase equilibrium developed, the present paper studied scaling conditions and variation laws of inorganic salts in formation fluids of in-situ gas reservoirs using a high-temperature and high-pressure formation-flu- id scaling test device. The influence of phase behavior changes at different positions of a wellbore or reservoir on laws of inorganic salt scaling was emphatically analyzed. The results showed that the evaporation of formation water and the solution and precipitation of acid gases are the main influence factors of phase changes in inorganic salt scaling. The scaling state of an actual gas-reservoir fluid results from comprehensive influences of chemical reactions and phase changes of various fluid components. Phase changes and scal- ing rules of formation fluids are mainly determined by reservoir pressure in reservoirs and by temperature in wellbores. If the influ- ence of phase behavior changes were not taken into consideration, the prediction scaling amount would be obviously lower, and with the decrease of pressure and the increase of temperature, the deviation would increase continually.

关 键 词：气藏流体 结垢测试 相态变化 无机盐结垢 预测模型 

分 类 号：TE372[石油与天然气工程—油气田开发工程]