迪那2气藏凝析水结垢规律实验研究  

Experimental study on scaling law of condensate water in Dina 2 gas reservoir

作　　者：沈建新[1] 刘建仪[2] 刘举[1] 吴红军[1] 谢泱 孙涛[1] 曹立虎[1] SHEN Jianxin;LIU Jianyi;LIU Ju;WU Hongjun;XIE Yang;SUN Tao;CAO Lihu(PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China)

机构地区：[1]中国石油塔里木油田分公司,新疆库尔勒841000 [2]油气藏地质及开发工程国家重点实验室西南石油大学,四川成都610500

出　　处：《中国海上油气》2022年第1期94-101,共8页China Offshore Oil and Gas

基　　金：“十三五”国家科技重大专项“库车坳陷深层-超深层天然气田开发示范工程(编号:2016ZX05051)”部分研究成果。

摘　　要：针对目前国内外对凝析水结垢规律认识不清的问题,采用自研的高温高压凝析水结垢量测试实验装置,通过正交实验方法,测试了高温高压条件下凝析水发生结垢反应前后成垢离子含量变化,研究了地层条件下凝析水离子变化规律以及CO_(2)对凝析水结垢的影响。实验结果表明:凝析水的蒸发导致凝析水中离子含量总体上升,随温度升高,非成垢离子含量升高,成垢离子含量只有在垢物析出时才开始下降,主要形成CaCO_(3)垢与CaSO_(4)垢,与实际井筒垢样全岩分析结果一致;压力降低使得水蒸发加剧,引起成垢离子含量增加,溶解在水中的CO_(2)逸出,其分压降低,易形成CaCO_(3)垢;CO_(2)对CaCO_(3)垢形成的影响存在临界值,对CaSO_(4)垢形成的影响无临界值。本研究可为生产现场井筒内凝析水结垢规律分析及防垢、除垢工艺技术优选提供支撑。At present,since the scaling law of condensate water is still a confused understanding in China and the World,the change law of ions in condensate water under subsurface formation condition and the effect of CO_(2)on condensate water scaling are studied in this paper.The experiment is carried out in a self-developed high temperature and high pressure(HTHP)condensate water scaling apparatus,and the orthogonal experimental method is used to test the content change of scaling ions in condensate water before and after the scaling reaction under HTHP condition.The experiment results show that The evaporation of condensate water leads to the overall increase of ion content in the condensate water.With the increase of temperature,the content of non-scaling ions increases,and the content of scaling ions only starts to decrease when the scale precipitates.Scales in condensate water are mainly the CaCO_(3)scale and CaSO_(4)scale.The experiment result is consistent with the results of whole rock analysis of actual scale samples taking from the wellbore;With the decrease of pressure,the evaporation of water intensifies,the content of scaling ion increases,the dissolved CO_(2)in water escapes,its partial pressure decreases,and CaCO_(3)scales can be easily generated;there is a critical value for the effect of CO_(2)on the generation of CaCO_(3)scales,but no critical value for the effect of CO_(2)on the generation of CaSO_(4)scales.The study results provide a support for analysis of the scaling law of condensate water in the well onsite and optimization of anti-scaling and descaling techniques.

关 键 词：凝析水 离子含量 结垢 CO_(2)含量 

分 类 号：TE999[石油与天然气工程—石油机械设备]