摘要
针对胜利油田水敏性油藏，研发了一种低分子有机季铵盐类黏土矿物膨胀防治剂SLAS-3，实验研究了SLAS-3预防和治理蒙脱石和天然岩心膨胀的效果。蒙脱石在蒸馏水中的膨胀性强，强碱性可明显抑制其膨胀；在20g／L的SLAS-3水溶液中，蒙脱石的膨胀率（以煤油为比较介质）保持在108％左右，不受pH（1～14）影响。在蒸馏水中达到膨胀平衡的岩心，经20g／L的SLAS-3水溶液处理后，其渗透率恢复率在室温时为85．17％，250℃时为94．41％。岩心先用20g／L的SLAS-3水溶液处理，再与蒸馏水作用并达到膨胀平衡，其渗透率保持率在室温时为95．53％，250℃时为96．36％。X射线衍射分析结果表明，在蒸馏水中蒙脱石晶层基面间距为1．9nm，经浓度≥15g／L的SLAS-3水溶液处理后缩小至1．24～1．25nm。SLAS-3能够改变黏土矿物基面间距，防治蒙脱石矿物水化膨胀。图6表1参5。
A new clay stabilizer SLAS-3, comprising a low molecular organic quartemary ammonium salt, is synthesized for water sensitive sandstone reservoirs in Shengli oil fields and is evaluated experimentally for prevention and elimination of clay swelling on Camontmorillonite （Ca-M） and reservoir cores. Ca-M is prone to swell in distilled water （DW） and high alkalinity restrains its swelling obviously. In 20 g/L SLAS-3 aqueous solution, Ca-M keeps a swelling capacity, determined with kerosene as comparative medium, of about 108%, which is independent of pH value （1-14）. For reservoir cores, swelled in DW to equilibrium at first and then treated with 20 g/L SLAS-3 solution, their permeability recovery reaches 85.17% of the original value at room temperature and 94.41%-at 25012. For reservoir cores, treated with 20 g/L SLAS-3 solution at first and then swelled in DW to equilibrium, permeability recovery values of 95.53% and 96.36% are observed at room temperature and 250℃, respectively. An X-ray diffraction analysis shows that the interplanar spacing d （001） of Ca-M is of 1.91 nm in DW and 1.24-1.25 nm in ≥ 15 g/L SLAS- 3 solution. Clay stabilizer SLAS-3 alterates the d（O01） value of Ca-M and thus can be used for inhibiting or eliminating hydration/ swelling of Ca-M.
出处
《油田化学》
CAS
CSCD
北大核心
2007年第4期320-323,共4页
Oilfield Chemistry
基金
中国石油化工集团科技攻关项目"王庄油田水敏性稠油油藏开发关键技术研究"
合同号P04055
关键词
蒙脱石
岩心
水敏性
水化膨胀
黏土稳定剂
防膨性能
防膨机理
montmorillonite
reservoir cores
water sensitivity
hydration/swelling
clay stabilizer
antiswelling capability
antiswelling mechanism
