Reasons for reserve losses of injection wells in Carbonate fractured-vuggy reservoirs and countermeasures for treatment:a case study of Block A in Tahe Oilfield
Water flooding to replace oil is one of the important ways to stabilize the production of fracture-vuggy reservoirs in Tahe Oilfield.In recent years,the proportion of water injection wells that fail to replace oil has been increasing year by year,and the reserve losses in water injection wells has become prominent.Based on the production characteristics and geological characteristics of single wells,the quantitative analy-sis of reserve changes in each stage is carried out through energy indicator curves and water injection indica-tor curves.The dynamic and static combination,and integration of geological modeling and numerical simu-lation are used to analyze the reasons for reserve losses.According to different types of reserves losses,dif-ferent countermeasures are put forward to recover out-of-control reserves and increase production capaci-ty.Reserve losses are mainly divided into two categories:remote reserve losses and internal reserve losses.As for the remote reserve losses,the goal is to restore the remote fluid supply,while for the internal reserves losses,the goal is to expand the production reserves around the well.The actual treatment effect is consist-ent with the prediction scheme of numerical simulation,and the treatment effect is good.
Tahe Oilfieldfractured-vuggy reservoirsquantitative analysisintegration of geological mod-eling and numerical simulationreserve loss
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