污水配制聚合物交联体系在江苏油田的应用

通过室内实验和油田先导性试验研究了污水配制聚合物交联体系的应用可行性。室内实验证明助凝剂可在较宽的 pH范围内促进污水配制HPAM 酚醛交联体系的交联反应。凡是可与聚合物交联体系组分或凝胶发生作用的污水特殊组分在达到一定浓度后 ,均可造成交联体系的凝胶强度降低或导致不成胶。凝胶强度随 pH、矿化度和聚合物水解度的增加而降低 ,聚合物的分子量和浓度的影响则反之。可使成胶时间变长的因素均会导致凝胶强度变弱。在真 1 2区块使用污水配制聚合物交联体系进行调驱处理的先导性试验获得了成功。真 4 9井的注入压力从 1 1 .5MPa升至 1 5.5MPa ,吸水剖面获得了明显调整。在弱凝胶处理后的约 6个月中总增油量达到了 1 30 0t,获得了较好的经济效益。图 5参 8

The application of a thin polyacrylamide gel formed with produced water in Jiangsu oil field.

This paper discusses the application of a thin polyacrylamide (HPAM) gel formed with produced water in Zhen12 Unit, Jiangsu oil field. The result of experiments indicates that some coagulant aids could help the gelation of the phenol formaldehyde/polymer in produced water. Whatever in produced water could react with the components in a polymer crosslinking system would result in the gel intensity weak or no gelation happened at a certain concentration. The study of the gel property shows that the gel intensity decreases with the increase of pH, salinity and the hydrolysis degree of the HPAM. On the contrary, it increases with the rise of the molecule weight of HPAM and the polymer concentration. Whatever makes the gelation time long would result in the gel intensity weak. The pilot test to apply a thin polyacrylamide gel formed with produced water in Unit Zhen12, Jiangsu oil field, is successful. First, the injection pressure increased from 11.5 MPa to about 15.5 MPa after the test. Then the water injection profile was improved greatly in the well. Finally, the oil increment in six months reached about 1,300t after the weak gel treatment.