一种延迟交联铬冻胶的研制及性能评价  

Development and Performance Evaluation of Delayed Cross-linking Chromium Gel

作　　者：刘文静[1] 贾寒[2] 曹金园 张立萍 刘雪辉 蒋坤鹏 周洪涛[2] 

机构地区：[1]中国石油大学胜利学院,山东东营257097 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]克拉玛依市正诚有限公司,新疆克拉玛依834000 [4]青岛昊博油田技术服务有限公司,山东青岛266580

出　　处：《油田化学》2016年第2期235-239,共5页Oilfield Chemistry

基　　金：克拉玛依正诚有限公司项目“低渗裂缝油藏选择性调剖技术研究”(项目编号12370502000229)

摘　　要：为获得成胶时间可调、耐温抗盐性能好的高强度铬冻胶,通过加入能显著改善成胶效果的添加剂研制了能满足50数90℃油藏温度的铬冻胶调剖剂。采用强度代码GSC法和突破真空度法研究了部分水解聚丙烯酰胺(HPAM)和交联剂重铬酸钠(Na_2Cr_2O_7)加量、还原剂Na_2SO_3和硫化物HN质量比、温度和矿化度等因素对铬冻胶成胶时间和冻胶强度的影响,并考察了冻胶体系对岩心的封堵和驱油效果。结果表明,随HPAM加量的增大,冻胶成胶时间缩短,强度增大;随Na_2Cr_2O_7加量的增大,冻胶成胶时间缩短,强度先增加后降低;随Na_2SO_3和硫化物HN质量比的降低,冻胶成胶时间延长,强度降低;铬冻胶的最佳配方为:0.5%HPAM、0.24%Na_2Cr_2O_7、0.16%Na_2SO_3和0.30%HN;体系中添加HN后,成胶时间由5 h延长至17 h,冻胶强度(突破真空度BV值)由0.076降至0.070 MPa;温度升高,冻胶成胶时间缩短,BV值增加;矿化度增加,冻胶成胶时间延长,BV值降低;对高渗管的封堵率大于96%,可提高原油采收率21.6%数22.8%。冻胶的耐温抗盐性良好,热稳定性较好,适合矿化度低于50 g/L、温度为50数90℃油藏的调剖堵水。In order to obtain the chromium gel with adjustable gelling time,good heat resistance and salt tolerance,and high intensity,chromium gel profile control agent which could be used for the reservoir with 50—90℃ was developed by adding additive to significantly improve the gel performance. GSC method based on the strength code and breakthrough vacuum method was used in this paper. The effects of HPAM mass fraction,Na2Cr2O7 mass fraction,the mass ratio of Na_2SO_3 to HN,temperature and salinity on gelation time and gel strength were investigated. And core displacement experiment was studied to simulate the stratum plugging effect. The results showed that with the increase of HPAM concentration,the gelling time shortened and gel strength increased,with the increase of Na_2Cr_2O_7 concentration,the gelling time shortened and gel strength increased first and then reduced at high concentration,with the decrease of Na_2SO_3 and sulfide HN mass ratio,the gelling time delayed and gel strength reduced. The optimum formula of chromium gel was obtained as follows： 0.5% HPAM,0.24% Na_2Cr_2O_7,0.16% Na_2SO_3 and 0.30%HN. The gelling time extended from 5 h to 17 h after HN was added,and the gel strength（breakthrough vacuum BV value）decreased from 0.076 to 0.070 MPa. The gelling time shortened and BV value increased when the temperature increased.While the gelling time prolonged and BV value reduced with increasing salinity. For high permeability tube,the plugging rate was more than96%,and the oil recovery was improved by 21.6%—22.8%. The gel had good heat resistance,salt tolerance and thermal stability. It was suitable for the profile control water plugging of reservoir with salinity lower than 50 g/L and temperature in the range of 50—90℃.

关 键 词：聚丙烯酰胺冻胶 铬冻胶 延迟交联 热稳定性 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]