边底水油藏蒸汽吞吐耐温冻胶泡沫的研制与评价
Speciality Petrochemicals(2022)
Abstract
针对边底水稠油油藏开采后期蒸汽吞吐效果不佳、汽窜和边底水入侵等问题,研制了一种具有耐温、耐盐性能的冻胶泡沫封堵体系.通过组分优选及性能评价,确定其组成为:3 g/L KYPAM聚合物+0.1% 硫脲+0.5%SDS起泡剂+0.2% 酚醛交联剂A+0.1% 有机锆交联剂B+0.3% 黄原胶.在150℃,NaCl矿化度为30 g/L条件下,该冻胶泡沫具有良好的稳定性,其泡沫半衰期可长达15 d.室内岩心封堵实验表明,该冻胶泡沫对高渗岩心具有较好的封堵性能,向渗透率为1000 mD的岩心内注入1.2 PV冻胶泡沫,封堵率可达99.92%.该体系的耐冲刷性良好,在水驱7 PV后,仍保持较高的封堵压差,具有良好的堵水调剖作用.
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