Analysis Of Mid-low Permeability Reservoir And Potential Damage In Jin 150 Blocks

The Jin 150 fault block is located in the east of the Jingu 1 well in the southern part of the western slope of the western depression in the Liaohe Basin,with 45 Jin-Jin in the north and 271 Jin-Jin in the south,with a nearly east-west strike.Nearly 2.1 km long things,nearly0.8 km wide north-south,oil-bearing area of 1.4 square kilometers,geological reserves of243×10~4 tons.The research target is Mesozoic oil layer.The overall structure is a nose-break structure that is southeastward and southwestern.The strata are steep in the axial direction,steep in the southeast and gentle in the southwest.The two systems are nearly east-west and near-northeast.Block in 2001 August Jin 150 well test mining Mesozoic "aquifer" by the oil and gas flow into the development.In the initial stage,due to the construction capacity,the daily output of fault block gradually increased.Due to the rapid decrease of formation pressure and the rapid decrease of output during the later period,the development trend gradually declined exponentially.Due to the reservoir structure and PHysical properties,the block has prominent development contradictions and strong reservoir sensitivity.After many years of water injection,the reservoirs are currently under pressure and oil wells are characterized by low liquid and low yield.At the same time,the fault block structure,reservoir and remaining oil distribution are not clear,which will bring some difficulties for further adjustment.Therefore,it is necessary to further implement the structure of the area and carry out the study on fine reservoir description of Jin-150 Mesozoic.Based on the analysis of the geological characteristics of the Jin150 reservoir and the damage mechanism of the reservoir during the injection process,the sensitivity experiment of the Jin150 reservoir is carried out and the potential damage of the injected water is analyzed.The results show that water sensitivity damage is the main factor in the injection of brocade 150 blocks,and the damage caused by suspension and oil content in injected water.Based on the above research,the paper makes a comprehensive evaluation of the development effect of the block,and puts forward a concrete plan to improve the development effect,in order to improve the recovery rate of the block and provide reference for water injection development of low-bore low-permeability sandstone reservoir.