| The effective development and utilization of dense reservoir is an important factor to measure a country’s oil production.Dense reservoir has the properties of high density and poor conductivity,which make it difficult to feed liquid to the crack.So the traditional fracturing process will be difficult to increase the oil production.In order to achieve effective fracturing,we should strengthen the communication of the primary and secondary cracks from three-dimensional direction.This new fracturing technology is called volume fracturing.Because of the complex conditions of cracks and the characteristics of the seepage in the dense reservoir,the correlation between reservoir and construction parameters is very poor.So the parameters of traditional fracturing process are not suitable for fracturing volume.Improper construction parameters will lead to the failure of fracturing.So the optimal parameters is eager to be confirmed.In order to solve the problem of optimal parameters,we usually use the mathematical statistics to analyze the parameters of primary and secondary cracks and brittleness index.It helps us to determine the volume of reservoir reconstruction modelChoose the long 7 density reservoir as the research object in the article.Based on the geological characteristics of the dense reservoir,the fracturing parameters and fracture morphology,use Fracro PT three-dimensional fracturing software and 3D SRV calculation software to study the factors which affect fracturing volume.By reference grey relation theory and the orthogonal design method,to determine the sensitive factors affecting transformation volume and optimizing the parameter combination.Studies show that the long 7 density reservoir has its optimal construction conditions.get the reasonable fracturing parameters,the delivery rate is 6~8m3/min,the reasonable pad fluid proportion is 15%~20%,the total fracturing fluid volume is 800~1000m3,the sand liquid ratio is 8%~12%.The optimizing results are used in other wells in the same area,and get a better stimulation effect. |
