Exploration of geology-engineering integration in hard-to-recover oil reserves in the Shengli Oilfield
【Abstract】Effective development of hard-to-recover oil reserves is an important measure to enhance oil development in China. The hard-to-recover reserves of low permeability and heavy oil in the Shengli Oilfield are nearly 6 × 108 t, accounting for more than 10% of the nation. Effective development faces many challenges such as complex oil-water system, lack of supporting technologies, and low productivity. Sinopec took Shengli Oilfield as a pilot project. After more than two years of cooperative development practice, it has explored a number of effective methods such as “innovation of cooperative mechanism”, “searching for sweet spots in low-grade reserves”, “geology–engineering integration”, “fine reservoir stimulation to increase productivity”. It has preliminarily achieved the goal of “management, recovery, and prodution”, the hard-to-recover oil reserves. The cumulative produced oil reserves are 4 860 × 104 t, established productivity is over 50 × 104 t, the drilling cycle is shortened by more than 60%, single well production is increased by about 40%, and the break-even oil price is dropped from 75/bbl to within 50/bbl. The practice of producing hard-to-recover oil reserves in Shengli Oilfield has initially formed a unique contracted productivity establishment plan and created an efficient model of geology–engineering integration of the whole industry chain, which has opened up a new direction for the sustainable development of mature oil areas with high degree of exploration.
【Keywords】 hard-to-recover oil reserves; low permeability; heavy oil; cooperative development; geology-engineering integration;
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