海上油田耐温耐钙镁盐调驱体系研制

Experimental Study on Thermophilic， Calcium-tolerant and Magnesium-tolerant Profile Control Agents in Offshore Reservoir

魏子扬 戴彩丽 王 闯 张艳辉 黎 慧 王 凯

WEI Ziyang DAI Caili WANG Chuang ZHANG Yanhui LI Hui WANG Kai

常规冻胶体系在钙镁离子含量较高的海上油田的稳定性较差。为了提高冻胶的耐钙镁盐能力， 制备了一种由耐温非离子聚合物 KF、 有机醛类交联剂 REL和有机酚类交联剂 MNE和稳定剂 WZ组成的耐温耐盐有机交联聚合物体系。利用成冻强度代码法和突破真空度法考察了聚合物质量分数、 交联剂质量分数、 稳定剂质量分数、 温度、 矿化度等因素对体系性能的影响。在此基础上优化出了 130℃条件下适于某油田的冻胶体系配方：0.3%～0.6%耐温聚合物 KF+0.3%～0.9%交联剂 REL+交联剂 0.3%～0.9%MNE+2%稳定剂 WZ， 该体系成胶时间4～50 h 可调， 成冻强度在 0.040～0.089 MPa 可调。配方为 0.6%聚合物 KF+0.6%交联剂 REL+0.6%交联剂MNE+2%稳定剂 WZ的成胶体系在高温 （130℃）、 高矿化度 （一价盐 2.0×105 mg/L或二价盐 8.0×103 mg/L） 条件下老化 30 d体积保留率大于 90%； 经不同程度的岩心剪切后放置在 130℃条件下老化 30 d未发生脱水现象， 且水驱10 PV封堵率仍保持 90%以上， 显示出较好的耐温抗盐性能和持续封堵能力。图6表5参10

For high temperature offshore reservoir with high content of calcium and magnesium ion，the stability of the conventional gel systems is poor. To improve the gel’ s tolerance to calcium and magnesium，thermophilic and halotolerant organically cross-linked polymer system was prepared with thermophilic nonionic polymer KF，organic aldehyde cross-linking agent REL， organic phenol cross-linking agent MNE and stabilizer WZ. The effect of polymer， cross-linking agents and stabilizer concentrations，temperature，salinity on gelling property was evaluated with the method of gel strength classification and breakthrough vacuum method. The best formula of the system for the reservoir was confirmed. The appropriate recipe at the temperature of 130℃was as follows，the KF dosage was 0.3%—0.6%，the REL dosage was 0.3%—0.9%，the MNE dosage was 0.3%—0.9%，and the WZ dosage was 2%. The gelation time could be controlled in the range of 4—50 h and the gel strength could be controlled in the range of 0.040—0.089 MPa. The lab experiment showed that the gel system containing 0.6% KF，0.6% REL，0.6% MNE and 2%WZ was thermophilic and halotolerant，while the volume retention was more than 90% after placed for 30 days in the environment of high temperature of 130℃ and high salinity of 2.0×105 mg/L monovalent salt or 8.0×103 mg/L divalent salt.The crosslinking system also had good shear resistance property and the volume retention was 100% after 30 days in the environment of high temperature（130℃）after different extent of shearing. Moreover，the system had consistent performance of flushing resistance，while plugging rate was still above 90% after 10 PV water flooding.

10.19346/j.cnki.1000-4092.2016.06.009