耐温抗盐悬浮隔板凝胶堵剂研究

Study on Temperature and Salt Resistant Suspension Separator Gel Blocking Agent

传统溶洞型油藏可固化颗粒注入性较差,密度选择性差,同时无机颗粒堵剂刚性大、变形能力弱、通过能力差,树脂类堵剂无选择性封堵作用等一系列问题,使得塔河油田堵水效果不佳。针对塔河油田堵水现状,通过系统考察凝胶体系成胶强度和脱水率来筛选合成了一种耐温抗盐性复合凝胶体系,通过耐温抗盐性机理分析等方法对样品迚行评价,得到最佳配方:0.8%AM/AMPS+0.04%酚类交联剂+0.04%醛类交联剂+0.04%多酚+0.3%硫脲+0.1%POP+0.5%轻质纤维BX。结果表明,此凝胶体系具有良好的耐温抗盐性、热稳定性和悬浮稳定性,在130℃时,30 d脱水率低于10%,凝胶成胶时间大于8 h,可耐矿化度达到223 000 mg/L。

The traditional karst cave reservoirs have poor injectability and poor density selectivity of solidified particles. At the same time, the inorganic particle plugging agent has large rigidity, weak deformation ability, poor passing ability, and resin plugging agent has not selective sealing effect. Due to above problems, the water blocking effect of Tahe oilfield is not good. Aiming at the current situation of water shut-off in Tahe oilfield, the gelatinization strength and dehydration rate of gel system were systematically investigated to screen out an temperature-resistant and salt-resistant gel system, and the gel system was evaluated by analyzing the properties of temperature and salt tolerance.The best formula was obtained as follows: 0.8% AM/AMPS+0.04% phenolic crosslinker+0.04% aldehyde crosslinker+0.04% polyphenol+0.3% thiourea +0.1% POP+0.5% lightweight fiber BX. The test results showed that the gel system had good temperature and salt resistance, thermal stability and suspension stability. At 130 ℃, the dehydration rate was less than 10% at 30 ℃, the gel gelling time was greater than 8 h, and its salinity tolerance reached223 000 mg/L.