Research And Application Of Depressurization And Increasing Injection Technology For The Multi-hydracid Of Western Oilfield In Xiliu 10 Fault Block

Huabei oilfield after 40 years of development,acidification is the oil field to improve the formation physical property and improve the important means of injection increase and oil increase,such as hydrochloric acid and mud acid,compound acid,acid in huabei oilfield has a more mature formula system and construction technology,also has obtained the good effect of measures,but in Xi Liu 10 block in the development process,because of poor reservoir property in western wellblock,the traditional acid system measures the effect is not ideal,the conventional mud acid and formation rock mineral reaction speed to deal with small scope,produce secondary sediment pollution formation,and the problem of oil,the casing corrosion,has affected the development effect of the block.And the fault block is a high temperature reservoir,which is a major technical problem troubling reservoir acidification.According to the above problem,this paper based on Xi Liu 10 block reservoir characteristics and the present development in the western wellblock of characteristic analysis,on the basis of the research of the low permeability reservoirs at home and abroad,the introduction of research of hydrogen acid acidification technology,through the indoor experiment to analysis and evaluation of formula,the final optimization for the west Xi Liu 10 wellblock is high temperature injection Wells of low permeability sandstone reservoir step-down augmented injection hydrogen acid acidification technology of green environmental protection,has obtained the good effect of augmented injection,at the same time,the research on the optimization of multiple hydrogen acid acidification process,separate injection Wells with fixed string set of photosensitive device insulation layers more acidizing technique,Aiming at injection Wells with multiple layers,thin layers and high difficulty of mechanical stratification,forming chemical temporary plugging homogeneous acidification technology,solving problems such as high difficulty of separate injection Wells and casing variable Wells,high cost of measures and long period.The technology will be tested in the field.Field test track evaluation results show that: the west Xi Liu block 10 wellblock of 10 injection Wells application experiment was carried out,and corresponding 36 well,the well see efficiency 65.2%,increased 250000 side note,increased 12200 tons of oil,and achieve the purpose of the augmented injection increased oil,not only improves the production efficiency,at the same time for the block "note enough water,fine water injection,water injection" provides a new technical support,open up new ways in order to ensure the development effect.