一种自生泡沫凝胶复合堵剂的室内研究

针对常规泡沫稳定性差，封堵效果有限的缺点，提出了自生泡沫/凝胶复合堵水剂。该体系的生气剂为NH₄Cl和NaNO₂，凝胶为水玻璃，酸催化剂为一种强酸弱碱钠盐，起泡剂为十二烷基苯磺酸钠，确定出了体系的基本配方为3.0%硅酸钠+2.0%胶凝剂QX+2.5%NH₄Cl+2.0%NaNO₂+0.5%ABS。利用高温高压反应釜对体系的产气特性进行了研究，结果表明该体系具有延迟产气的特点，在12h后才开始大量产气，体系的胶凝时间长达16h，胶凝后具有一定的抗压强度，可提高对地层的封堵能力；岩芯流动实验表明，该自生泡沫/凝胶体系可有效地封堵含水岩芯，封堵率为88.1%，对含油岩芯封堵效果较差，因而是一种较好的选择性堵剂。

THE LAB TEST OF A NEW TYPE SELF-GENERATED FOAM GEL COMPOUND WATER-CONTROL AGENT

Aiming at the bad stability and limited blocking effectiveness of conventional foam system,the self-generated foam gel compound water-control agent is proposed.In this system，NH₄Cl-NaNO₂ is chosen as the self-generated gas agent，sodium silicate is chosen as the gel agent,acid-catalyst is a kind of Alkalescent-strong acid sodium salt,foam agent is sodium dodecyl benzene sulfonate.By means of high-temperature and high-pressure reaction vessel,the properties of self-generated gas system is researched，the result indicates that this system has the characteristic of delayed gas generation，it can react violently after 12hours；the jellification time is 16hours，it has a certain compressive strength after jellification which can enhance blocking ability;core flow test shows that the system can block aquiferous core effectively,the efficiency of shut off is 88.1%,the plugging performance to oily core is noneffective,so it is a kind of well selective water-control agent.