Abstract
AbstractIn the late period of ultra-high water cut (water cut >95%), the production status of multi-layer sandstone reservoirs is uneven due to the reservoir heterogeneity, and there are still remaining oil enrichment sites with relatively high oil saturation. Study have been carried out to control production decline and water cut increase, so that the remaining potential will be better tapped. On the basis of the precise structure and reservoir anatomy, the remaining oil distribution was accurately positioned and quantified. According to the distribution characteristics of the remaining oil in different types of sand bodies, the comprehensive strategies of digging the remaining oil were adopted, such as controlling water in thick oil layers, intensively mining in thin poor layers and efficiently tapping in fault zones. The practice of comprehensive exploitation in the test area shows that the good effect of controlling the rise of water cut and slowing down the production decline can be achieved in the late stage of ultra-high water cut through the integrated application of conventional measures and scale application of new technology. The production decline in the test area slows down by 4% points, the annual water cut rise slows down by 0.2% points, the oil production has increased by 735,000 tons during five years, and the input-output ratio has reached 1:2.5 at the condition of oil price of $40, which achieved good development effect and economic benefits. The comprehensive development strategies in test areas can be used to direct the development of multi-layer sandstone oilfields in the ultra-high water cut period.KeywordsSandstone oil fieldThe late stage of ultra-high water cutWater floodingComprehensive tapping potential
Published Version
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