复合解堵剂对大庆油田三元复合驱注入井的解堵效果

Plug Removal Effect of Compound Plug Removal Agent in Alkali-surfactant-polymer Flooding Injection Wells of Daqing Oilfield

管公帅 康燕 傅海荣 王佳

GUAN Gongshuai，KANG Yan，FU Hairong，WANG Jia

为改善大庆油田聚合物/碱/表面活性剂三元复合驱主段塞注入后期部分注入井注入压力升高、注入量降低的问题，制备了由无机铵类化合物降解剂和复合酸组成的复合解堵剂体系，研究了该复合解堵剂对三元复合驱注入井堵塞物的室内解堵效果，并在大庆油田进行了现场解堵增注试验。结果表明，复合解堵剂对注入井堵塞 物的溶解效果较好，溶解率大于98%；现场应用时先注入降解剂处理地层中的聚合物团块堵塞，再注入复合酸处理剩余的垢质及机械杂质等堵塞物，对14 口三元复合驱注入井解堵后，初期平均压力降低2.2 MPa、平均日注入量增加12.5 m3、平均有效期183 d。该复合解堵剂对主段塞后期及副段塞阶段因堵塞导致注入能力降的三元复合驱注入井有较好的降压增注效果。表5 参13

In order to solve the problem of increased injection pressure and declined injection volume during late injection period of main slug of some alkali-surfactant-polymer（ASP）flooding injection wells in Daqing oilfield，a compound plug removal agent composed of inorganic ammonium degradation agent and compound acid was prepared. The plug removal effect on the plug from ASP injection well was studied in lab and blocking test was applied on the injection wells of Daqing oilfield. The results showed that this compound plug remover agent had good dissolve effect on the plug of injection wells with more than 98% dissolving rate. When the plug removal agent was applied on site，the degradation agent was injected first which used to degrade the clumps blocking of polymer，then the compound acid was injected which used to treat the residual scale and mechanical impurity. After the plug of 14 wells with ASP injection was removed，the average pressure of the wells in early days decreased 2.2 MPa，the average daily injection increased 12.5 m3，and the average period of validity reached to 183 days. The compound plug removal agent had a better decompression and augmented injection effect to ASP flooding injection wells which injectability declined because of plug in late injection period of main slug and side slug.

10.19346/j.cnki.1000-4092.2016.03.013