蒸汽深部封窜用热触变聚合物-黏土复合体系性能研究  

Composite System of Thermal Thixotropic Polymer and Clay for Indepth Channel Plugging of Steam Huff Puff Viscous Oil Wells

作　　者：纪文娟[1] 戴彩丽[1] 张志武 任树亮[1] 张艳辉[1] 赵福麟[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,山东青岛266555 [2]中国石油大庆油田海拉尔石油勘探开发指挥部,黑龙江大庆163453

出　　处：《油田化学》2011年第2期172-176,共5页Oilfield Chemistry

基　　金：2010年教育部新世纪优秀人才支持计划;山东省杰出青年基金(项目编号JQ201013);山东省"泰山学者"建设工程(项目编号ts20070704);中国石油大学(华东)研究生创新基金资助项目(S10-05)

摘　　要：针对稠油蒸汽吞吐油藏发生的汽窜现象,室内分别用旋转黏度计、流变仪、管倒置法和突破真空度法测定了蒸汽深部封窜剂热触变聚合物-黏土复合体系的黏温性、流变性、热触变温度和强度等性能。研究结果表明:3%热触变聚合物与黏土复合体系在达到热触变温度后(75℃左右)黏度急剧增大,形成冻胶。复合体系(1%～3%热触变聚合物与0～4%黏土)的热触变温度为75～88℃,强度为0.01～0.03 MPa,随着热触变聚合物或黏土质量分数的增加,热触变温度降低,触变前的黏度及触变后的强度均增大。触变前,复合体系黏度随剪切速率变化不明显,具有一定的抗剪切性;触变后,体系黏度随剪切速率的增大先升高后降低。复合体系在200℃条件下2 h内不发生脱水现象,能封堵高温窜流蒸汽。填砂管物模实验表明触变前复合体系具有良好的注入性,能进入地层深部;触变后具有较好的封堵性,封堵率高达95%。In order to prevent from indepth steam channeling during steam simulation,the performances of the composite system,composed of thermal thixotropic polymer and clay,in the viscosity-temperature,rheological behavior,thermal thixotropic temperature（TTT）and gel strength,were studied by rotational viscometer,rheometer,inverting test tube and breakthrough vacuum method,respectively.It is demonstrated that the gel was formed when temperature was up to the TTT（75℃）.The TTT of the composite system（1%～3% polymer＋0～4% clay） was about 75～88℃,and the gel strength was 0.01～0.03MPa.With the increase of the content of the polymer or the clay,the TTT decreased,while the viscosity of the composite system and the gel strength increased.The composite system had high shearing resistance,which reflected on the unchanged viscosity with changing shearing rate before forming gel,and viscosity increased first and then decreased with increasing shearing rate after forming gel.Composite system can be applied to shut off channeling steam because of its resistance to high temperature up to 200℃ and not dehydration within 2 h.The results of the physical model test showed that the composite system could enter into the indepth formation because of it＇s good injection,and the plugging rate of the formed gel was over 95%.

关 键 词：热触变聚合物 稳定化钠土 蒸汽吞吐 深部封窜 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程] TE39