低黏吸附型酸化缓速剂的合成及性能评价

为改善深度酸化效果，降低储层二次伤害风险，合成了一种低黏吸附型酸化缓速剂。采用AM、非离子型表面活性剂（FLZ-1）、C-18、SSS 4种单体，通过自由基水溶液聚合得到一种低黏且具有吸附作用的酸化缓速剂。通过单因素法筛选出最佳的合成条件，利用傅里叶红外光谱仪和核磁共振波谱仪对产物的结构进行表征，结果与设计的结构相符。通过考察酸化缓速剂添加量对缓速酸性能的影响，结果表明当缓速剂添加量质量分数为0.7%时，缓速效果较好且具有较低的表观黏度（10mPa·s以下），有利于酸液的注入与返排。并在75℃下对缓速剂与其他酸液常用助剂的配伍性进行评价，结果显示配伍性良好，且各种助剂之间不影响各自的使用效果。排水采气、X射线光电子能谱和扫描电镜的结果表明，缓速剂在酸岩反应的过程中在岩石表面发生了吸附。

Synthesis and characterization of low viscosity adsorption acid retarder

In the process of acidification, acid solution has different treatment effects on strata with different permeability. In order to improve the recovery rate of low permeability strata, the acid retarder with low viscosity and adsorption was obtained by free radical aqueous solution polymerization of four kinds of monomers, AM, FLZ-1, dmdaac-18 and SSS. The best synthetic conditions were determined by single factor method. The structure of the product was characterized by Fourier infrared spectrometer, NMR spectrometer. The results were in agreement with the designed structure. By investigating acidification retarding agent added amount of retarded acid, the results showed that when the dosage and mass fraction of retarder was 0.7%, the slow effect is better and had lower apparent viscosity (below 10mPa·s), which was beneficial to the injection and backflow of acid. The compatibility of retarding agent and other acid additives was evaluated at 75℃. The results showed good compatibility, and the various additives did not affect each use efficiency. And the results of gas drainage, XPS and scanning electron microscopy (SEM) showed that the retarder adsorbed on the rock surface during the acid rock reaction.