Research On Low Permeability Sandstone Reservoir Effective Percolation Ability Evaluation Method Of Shengli Oil Field

China has a new proven geological reserves of low-permeability oil field has more than 50 million tons,widely distributed in various oil region in the country.Currently,10 percent of the country's onshore oil reserves are in the low permeability oil and gas fields,has proven reserves of more than half of the low permeability reserves,accounting for 61.2% of the total proven reserves,low permeability sandstone reservoir is a victory for the main oil region one of the reservoir type,the region's proven geological reserves of low-permeability oil 626 million tons,accounting for the total proven oil reserves of 13.9 percent,is one of the important positions in increasing reserves Shengli Oil Field.Field Development Practice shows that the presence of low-permeability oil field development and the effects of hypertonic very different fields,the use of low-permeability reservoirs degree is still low,only about 50 percent,has been lower use of oil recovery,development there are various technical difficulties.The reason is that different from the low permeability reservoirs,reservoir permeability characteristics,such as poor physical properties of low permeability reservoir permeability,low porosity,pore throat tiny,poor connectivity,reservoir heterogeneity severe,and thus,low permeability reservoir which is different from the high permeability reservoir seepage law.In the evaluation of the characteristics of low permeability reservoir parameters,the air permeability of the rock has been an important evaluation parameters,based on the size of the air permeability of the reservoir is divided.But the analysis of the current situation and development of the experimental data from different blocks of indoor low permeability reservoirs,recognizing the different blocks of the same penetration level demonstrated by the effective flow capacity is different,by the size of the air permeability reservoir divided effective flow capacity has certain limitations.The issue from the start to establish a scientific test methods,factors of reservoir rock properties,fluid properties,reservoir rock microscopic pore structure and other low permeability effective flow capacity mechanism analysis,scientific screening,in line with the eventual establishment of a low Shengli Oil Field permeability sandstone reservoirs,reflecting the effective flow capacity with many key factors related to the evaluation model.Effective flow capacity and low permeability reservoir evaluation models were tested with actual reservoir,through optimal adjustment of the relevant parameters,to further improve the method,to provide technical and theoretical support for the effective development of low permeability sandstone reservoirs.