渤海油田弱凝胶与泡沫复合调驱体系优化

采用流变、常规量筒法、扫描电镜及显微镜,研究了优选出的3种弱凝胶与SD发泡剂的复配体系的起泡性能、黏度、稳定性以及微观结构。结果表明,起泡剂与弱凝胶复配之后,体系的各项性能得到明显改善。复配体系半衰期增大,泡沫黏度增大,稳定性增强,明显优于单一体系。在弱凝胶与泡沫复合调驱体系中,凝胶易在气泡表面形成吸附膜,将泡沫包裹在内部,增强了气液界面的黏度,使得泡沫不容易发生聚并破裂,从而增强了泡沫的稳定性以及黏度,使得其半衰期也增大。

Optimization of Weak Gel-Foam Composite Systems for Bohai Oilfield

The foaming ability,viscosity,stability and microstructure of the weak gel-SD foamer composite systems were studied by rheology,cylinder measurement,scanning electron microscopy （SEM）and microscopy.The results demonstrated that the properties of weak gel-SD foamer composite systems was improved obviously compared to the single flooding technology.When half-life period of the compounded system became longer,and the viscosity of foam increased,the foam stabilitywas enhanced.In the weak gel-foam composite system,an adsorption film of weak gel on the foam was formed easily, which meant that the foam was wrapped in the inside.The interfacial viscosity between gaseous and liquid phases was enhanced,preventing the foams to coalescence and breakup.Therefore,the viscosity and stability of foam were reinforced and the half-life period became longer.