Research And Application Of Seepage Mechanism Of Oil Reservoirs In Low Permeability Glutenite

The glutentite oil reservoirs are widely distributed all over the world,with huge reserves and broad development prospects.The Upper Wuerhe Formation of Permian in Jin Long 2 Well area is low permeability glutentite oil reservoirs,which is characterized by low porosity,low permeability and abnormally overpressure.The stress-sensitivity effects,starting pressure gradients and strong heterogeneities cause complex seepage mechanism.At present,there is still a lack of understanding of the seepage mechanism of glutentite reservoirs at home and abroad.Therefore,it is necessary to look deeper into the oil reservoirs' seepage mechanism in Jin Long 2 well area,to provide a theoretical basis for the follow-on development of this block.First of all,Large amounts of literature investigations show the petrological characteristics of reservoirs in the Jin Long 2 Well area.Based on the data obtained through the core porosity and permeability experiments of pore and permeability rates,analysis of experimental data related to pore and permeability are been made to make sure the heterogeneity degree in Jin Long 2 Well,which is the further understanding of glutentite reservoirs.Secondly,Through indoor simulation research of typical seepage characteristics of low-permeability oil reservoirs,the experimental study was mainly focused on the stress sensitivity,starting pressure gradient and re-enrichment of remaining oil,the changes of stress sensitivity effect,starting pressure gradient and the re-enrichment law of remaining oil in the Jin Long 2 Well area are defined.Based on the experiments,the main influencing factors of oil reservoirs seepage mechanism in low permeability glutentite are summarized.Finally,Combining with main influencing factors of oil reservoirs seepage mechanism in low permeability glutentite and previous research results,a productivity prediction model considering stress sensitivity and starting pressure gradient is established.The model combines with actual data in the study area,comparing the influence degree to the capacity of different factors.According to the characteristics of the strong heterogeneity of glutentite reservoirs,established the numerical model with different influencing factors.Thus numerical models which compares and analyses the changes of production capacity under various conditions are established under different influencing factors.Based on large amounts of literature investigation and indoor simulation studies,the thesis combines numerical simulation method to study the seepage mechanism of low permeability of glutentite reservoirs.Establish the prediction model of production capacity of vertical well and horizontal well.It is clear that the main influencing factors and the change of production capacity of the seepage flow in jinlong 2 well area provide theoretical basis for the follow-up development of the research area and provide reference for similar oilfield development...