Research on Technical Measures to Improve the Development Effect of Jizhong Major Sandstone Reservoir in Huabei Oilfield

As the main contributor to the production of Huabei Oilfield, the major sandstone reservoirs in Jizhong area have entered into middle and late development stages with high water cut, and the development effect has gradually deteriorated. Therefore, effective technical policies are the key to improving the development effect of reservoirs. Combining the characteristics of different sandstone reservoir types, existing problems and remaining oil potential, this paper has formed an adjustment technology that can effectively improve the development effect in the middle and late development stages of sandstone reservoirs in Jizhong area, through carrying out research on layer recombination and subdivision, differentiated adjustment of injection-production well pattern, the potential exploration of injection-production profile and other technology, which has been applied in more than 10 blocks. After the adjustment, the natural decline of these blocks has slowed down from 14.9% to 11.3%, the comprehensive decline from 8.7% to 2.3%, and the increase rate of water cut decreased by 1.9 percentage points.