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港西4区聚合物驱的目的层属河流相沉积,油层非均质性严重。为了改善注水井吸水剖面并验证聚合物对油层的适用性及经聚合物调整吸水剖面后注水井能够顺利进行聚合物驱。经室内试验确定了“温和型”调剖的设计参数。现场试验表明,采用柠檬酸铝交联工艺,改善了不利的吸水剖面,但未严重降低注水井的吸水性能。单井注入试验确定聚合物在油层中的吸附量;机械剪切降解程度;适用的聚合物类型和最高注入浓度等的关键设计参数。根据室内试验和单井注入性试验,确定了井组的聚合物驱方案。通过调剖和单井注入试验,有4口井见到了明显的增油效果,平均注1吨聚合物可增产原油264吨。
The target layer of polymer flooding in Port 4 Area of Hong Kong is river facies sedimentation, and the reservoir heterogeneity is serious. In order to improve the water injection profile of injection well and verify the applicability of polymer to the reservoir, polymer injection can be successfully carried out after polymer injection profile adjustment. After indoor test to determine the “moderate” profile control of the design parameters. Field tests showed that the cross-linking process with aluminum citrate improved the unfavorable water absorption profile, but did not seriously reduce the water absorption performance of injection wells. Single well injection tests determine the amount of polymer adsorbed in the reservoir; the degree of mechanical shear degradation; the key design parameters for the appropriate polymer type and maximum injected concentration. Based on the laboratory tests and single well injection tests, the polymer flooding scheme for the well group was determined. Through the profile control and single well injection test, 4 wells have seen significant oil increase effect. The average injection of 1 ton of polymer can increase 264 tons of crude oil.