油层复合保护技术中酸液的影响

The Influence of Acid Solution on Oil Reservoir to Complex Protective Technique

针对杏南油田太19区块新投注水井吸水厚度低的问题,结合近几年杏南油田在注水井投注前注入保护剂的经验,在室内模拟实验评价基础上,将油层清洗、酸化、粘土防膨三种技术相结合形成了复合处理技术,开发了油层复合保护剂。室内实验表明,复合保护剂中酸液与储层的配伍性在很大程度上决定了其使用效果。如果酸液选择合理,能够有效地提高储层的渗流能力。现场应用4口井,启动压力得到有效降低、吸水指数提高,取得了较好的降压、增注效果。

To the problem of low absorbed water thickness of new water injection wells in No 19 Tai block of Xingnan Oilfield,according to the experience of injecting protection reagent before wells are injected, on the basis of simulation experiment estimation,through combining three kind techniques of the oil layer washing,acidifying and clay expand inhibitor, the complex protection reagent of oil reservoir was developd Experiment indicates that the match degree of acid solution of complex protection reagent to reservoir decides applied results If acid solution is selected properly, it can improve the capability of seepage flow in oil layer effectively This technique was applied to 4 wells, the start up pressure was reduced effectively and water absorbability was improved, the good effect of reducing pressure and increasing injection water is made