关键词: 油层评价, 最优化, 采油量, 重复压裂, 胜利油田

Abstract: The effect to increase oil production of fracturing will lost with the reducing of fracture inflow ability because of pollution,blockage etc.after a period in a well.Refracture should be carried on under the condition that a lot of formation energy and reserve has been remained.In this paper,the effective permeability,Yong's ratio,formation stress profile,energy and remained reserve have been evaluated to 8 wells in south Zhuang 74 block in Shengli Wu Haozhuang oil field according to the characteristics of low-permeability,high solidification point,temprature and depth,as well as fast decreasing production after a high initial value in first fracturing.It is considered that the wells have the condition to be refractured.The geometric configuration and flowing ability of the fracture after first fracturing has been caculated and evaluated by using DST well test,fracturing and reservoir simulation.The plan has been given on the principles and results to chose wells,formations,fracturing fluids and proppants.The optimium fracture half length is 110-120m according to this study.The plan has reached good results that fracture flow capacity increases 4 times and the net income is 1,669,000 Yuan 133 days after the fracture plan being finished.

Key words: formation evaluation, optimization, oil production, multiple fracturing, Shengli oilfield