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油基钻井液乳液稳定性影响因素研究
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Abstract:
为充分了解油基钻井液乳液稳定性影响因素，选择了界面张力值低的乳化剂PF-EMUL-2与PF-COAT-2配制乳液。研究了乳化剂浓度、油水比、内相盐浓度与种类、基液种类以及重晶石对乳液稳定性的影响。研究发现，3 wt% PF-EMUL-2与1 wt% PF-COAT-2复配时，随着油水比增大，乳液稳定性增强，与Na+离子相比，Ca2+离子能提高乳液滴的界面膜强度。高温老化后重晶石吸附部分乳化剂，造成乳化能力下降，因此高密度钻井液中需加入较多的乳化剂稳定乳液。这些研究为控制油基钻井液体系的稳定性提供理论基础。
In order to fully understand the influence on the stability of oil-based drilling fluid emulsion, emulsifiers PF-EMUL-2 and PF-COAT-2 were selected to prepare emulsion. The influence of emul-sifier concentration, oil-water ratio, concentration and type of internal salt, type of base liquid and barite on emulsion stability were studied. The results show that, the emulsion stability increases with the increase of oil-water ratio, and compared with Na+, Ca2+ ions can improve the interfacial film strength of emulsion droplets. The study also shows that barite adsorbs some emulsifiers after high-temperature aging, which results in a decrease of emulsifying affection, so more emulsifiers should be added to stabilize the emulsion in high-density drilling fluid. All the studies provide theoretical basis for controlling the stability of oil-based drilling fluid system.
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