基于Gemini表面活性剂及纳米材料的高效泡排剂

Efficient foam unloading agent based on Gemini surfactant and nanomaterials

针对部分低压产水气井温度高、矿化度高以及含高浓度H_2S气体的特点,通过合成特殊梳状结构的Gemini阴离子表面活性剂,并将其作为起泡剂分子,再加入改性后的一定尺寸、疏水程度的纳米粒子充当固态稳泡剂,制备出高效泡排剂。该高效泡排剂一方面利用特殊梳状结构的Gemini阴离子表面活性剂可以在气液界面形成致密排列的结构,增强泡膜的稳定性;另一方面固态稳泡剂——纳米粒子可以吸附在气水界面形成稳定的空间壁垒,从而阻止气泡的聚并和歧化;该体系极大程度的发挥了表面活性剂和纳米粒子之间的协同作用从而达到提高泡沫稳定性的作用。室内实验研究结果表明:该泡排剂在温度为150℃、矿化度为250000ppm、H_2S浓度为400ppm下起泡性、稳泡性优良,而压力的增加则会提高泡沫稳定性,可以满足高温、高矿化度及含酸性腐蚀气体产水气井的泡排施工要求。

The high efficient foam unloading agent was developed to solve the problem of unloading of low pressure gas well with high gas temperature,salinity and high concentration of H2S gas.The Gemini anionic surfactant with special comb structure was syn-thesized as foaming agent molecule,and the modified nanoparticles with certain size and degree of hydrophobicity was adopted as solid foam stabilizer.On the one hand,the special comb structure Gemini surfactant can form compact arrangement in the gas-liquid interface,on the other hand nanoparticles which act as the solid foam stabilizer can adsorb onto the gas-liquid interface to form the stable space barriers,so as to prevent bubble coalescence and disproportionation,the system heavily played the synergy effect be-tween surfactant and nanoparticles to enhance the foam stability.The experiment results show that the foam unloading agent showed good foaming and foam stabilizing ability when the temperature is as high as150丈,salinity resistance up to250000ppm and H2S concentration up to400ppm,however the pressure increase will improve foam stability,which proved that the foam unloading agent can meet the site foam unloading construction requirements of gas well with high gas temperature,salinity and high concentration of H2S gas.