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

刘文静 贾 寒 曹金园 张立萍 刘雪辉 蒋坤鹏 周洪涛

LIU Wenjing JIA Han CAO Jinyuan ZHANG Liping LIU Xuehui JIANG Kunpeng ZHOU Hongtao

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 （Na2Cr2O7） 加量、 还原剂 Na2SO3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 Na2Cr2O7加量的增大， 冻胶成胶时间缩短， 强度先增加后降低； 随 Na2SO3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% Na2Cr2O7、 0.16%Na2SO3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%～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。图4表6参15

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 Na2SO3 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 Na2Cr2O7 concentration，the gelling time shortened and gel strength increased first and then reduced at high concentration，with the decrease of Na2SO3 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% Na2Cr2O7，0.16% Na2SO3and 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 than 96%，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℃.

10.19346/j.cnki.1000-4092.2016.06.010