抗盐聚合物交联体系在高温高盐条件下的稳定性研究

Stability Research of Polymer/Crosslinker Gelling Systems under High Temperature and High Salinity Condition

海玉芝 吕成远 崔茂蕾 谭中良 周国华 张淑洁

HAI Yuzhi，LV Chengyuan，CUI Maolei，TAN Zhongliang，ZHOU Guohua，ZHANG Shujie

为了扩展交联聚合物体系在高温、高盐油藏的应用，考察了有机醛交联剂GWG 分别与常规聚合物（KYPAM和KYPAM-6）、疏水缔合聚合物（AM-NVP和AM-DMDA）、抗盐聚合物（HPAM3 和NY-1）形成的交联体系的长期稳定性，优选了抗盐聚合物HPAM3 及其交联体系配方，研究了含氧量、矿化度、硬度、温度等对交联 体系长期稳定性的影响。研究结果表明，对于聚合物1000 mg/L+GWG 50 mg/L的交联体系，在含氧量＜0.1 mg/L、100℃的条件下，普通型聚合物及疏水缔合聚合物在交联老化30 d 左右就缩水破胶，抗盐聚合物HPAM3 的交联体系具有较好的稳定性，在老化150 d 后的黏度仍为62.6 mPa·s。当氧含量低于0.1 mg/L 时，500～1800 mg/LHPAM3+35～80 mg/L GWG 的交联体系在100℃老化90 d 后仍具有较好的成胶性能和稳定性能；在氧含量＜0.5 mg/L 时，1500 mg/L HPAM3 +50 mg/L GWG+200 mg/L 硫脲的交联体系的耐温抗盐性能优良，可耐温105℃、耐盐200000 mg/L（含Ca2+500 mg/L），该交联体系在100℃下老化90 d 后的黏度为124 mPa·s，远高于浓度2500mg/L HPAM3溶液的黏度（42.7 mPa·s）。图4 表3 参15

In order to expand the application of crosslinked polymer system in high temperature and high salinity reservoirs，the long term stability of the crosslinked polymer system，composed of organic aldehyde crosslinker（GWG）and common polymer（KYPAM and KYPAN-6）or hydrophyobically associating polymer（AM-NVP and AM-DMDA）or salt resistant polymer（HPAM3 and NY-1），was studied. The gelling system with polymer HPAM3 was selected and the influences of oxygen content，salinity， divalent ion and temperature on long term stability were studied under condition of temperature of 100℃ and oxygen content less than 0.1 mg/L. the results showed that only crosslinked system composed of 1000 mg/L salt resistant polymer HPAM3 and 50 mg/L GWG had good stability，the viscosity was of 62.6 mPa·s after aged for 150 days，while the crosslinked system containing KYPAM， KYPAM-6，AM-NVP and AM-DMDA was broken after aged for 30 days. When the oxygen content was controlled less than 0.1 mg/L，the crosslinked system composed of 500—1800 mg/L HPAM3 and 35—80 mg/L GWG had good crosslinking ability and stability after aged for 90 days at the high temperature of 100℃. As oxygen content was less than 0.5 mg/L，the crosslinked system composed of 500 mg/L HPAM3，50 mg/L crosslinker and 200 mg/L thiourea could endure temperature of 105℃ and salinity of 200000 mg/L（including 500 mg/L Ca2+），and the viscosity of the system remained at 124 mPa·s after aged for 90 days at the temperature of 100℃，which was higher than that of polymer HPAM3 solution with the concentration of 2500 mg/L（42.7 mPa·s）.

10.19346/j.cnki.1000-4092.2016.04.022