Policy Research Of Tight Oil Developed By Pseudo-natural Energy In X Block In Changqing Oilfield

X wellblock in Changqing Oilfield is developed by using horizontal well and multi-stage fracturing technology development,blocks with few difference of geological characteristics have completely different dynamic characteristics.Considering the horizontal well fracturing due to fracturing fluid retention,this paper carries out the study of production mechanism and seepage law,and provides feasible suggestions for the follow-up development.Based on the existing geological,logging and production data,this paper uses the statistical data,reservoir engineering and numerical simulation methods on the evaluation and analysis of the current production conditions.The results showed that the cause of production differences is that the process of energy release process is different.And according to the different stage of releasing energy,the development process is segmented,divided into the liquid elastic period,rock and fluid elastic period and dissolved gas period;the influence factors of production capacity are analyzed,and the main factors affecting the cumulative output of the first two years are the fracturing fluid volume,viscosity,dissolved gas oil ratio and well spacing.This paper also studies the seepage law and optimizes well spacing,row spacing,half fracture length and its late stage energy supplement uses water stimulation combined with refracturing and carbon dioxide injection,which can significantly improve the development effect.This article has been clear about the natural energy development mechanism which provides important theoretical basis of policy research of tight oil developed by pseudo-natural energy.