高温高压下碳酸钙的溶解度及朝阳沟注水油田低渗透储层结垢问题  

Solubilily of CaCO_3 in Water at High Temperatures and High Pressures and Scaling Problems in Water Flooding Low Permeable Reservoirs of Chaoyanggou in Daqing

作　　者：赵子刚[1] 徐启[2] 史连杰[2] 汤文玲[3] 

机构地区：[1]大庆石油学院石油工程系,黑龙江大庆163318 [2]中国石油大庆油田公司采油十厂,黑龙江大庆163221 [3]中国石油吉林油田分公司勘探开发研究院,吉林松原138001

出　　处：《油田化学》2003年第1期4-6,共3页Oilfield Chemistry

摘　　要：大庆朝阳沟低渗透水驱油田一些注水井注水压力不断上升,采油井井底结垢,垢样含63.4%CaCO3、22.0%Fe2O3、14.6%有机物及其他。讨论了生成CaCO3垢的基本化学反应。实验测定并发表了温度分别为25、50、75、90℃±0.1℃,压力分别为0.1、9、19、29MPa(测量误差±5%,0.1MPa时除外)时,CaCO3在蒸馏水中的溶解度数据(单位mg/L)。概括性地讨论了相同离子和盐对CaCO3溶解度的影响。基于测得的溶解度数据及注入水、地层水矿化离子种类和含量,认为在朝阳沟油田,注水井井底温度25℃、压力约19MPa(注水压力9MPa),只要严格控制注入水的离子种类和含量,一般不会产生CaCO3结垢;采油井井底温度约45℃,压力≤0.2MPa,易产生CaCO3结垢。图2表1参2。At water flooding Chaoyanggou oil fields in Daqing, the water injection pressure in a lot of wells increases continuously and scale is formed in the bottom of production wells with scaling substances: 63.4% CaCO3, 22.0% Fe2O3, and 14.6% organics and others. The basic chemical reactions for CaCO3 scale creation are presented. The solubility of CaCO3 (in mg/L) in distilled water is determined and published for temperatures 25,50,75 and 90℃±0.1 C and pressures 0.1,9,19, and 29 MPa (with relative measuring error±5% besides of the case of 0.1 MPa), respectively. The similar ion and the salt coexisted as influencing factors for CaCO3 scaling are discussed in general. Based on the solubility data determined and the species and concentrations of ions in the injection and formation waters, its is ascertained that at Chaoyanggou oil fields in the bottom of injection wells with temperature ～25℃ and pressure ～19 MPa (injection pressure 9 MPa) CaCO3 scale does not appear commonly if the species and concentrations of scaling ions in injection water are under proper control; in the bottom of production wells with termperature ～45℃ and pressure ≤0.2 MPa CaCO3 scale creates readily.

关 键 词：碳酸钙 溶解度 高温高压条件 结垢 注水油藏 大庆朝阳沟油田 

分 类 号：TE358.5[石油与天然气工程—油气田开发工程]