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Abstract
The bottom water heavy oil reservoir has high natural energy, and the bottom water body multiple of the reservoir is 300 times or even higher. The natural energy of the reservoir can keep the superior condition that the formation energy does not decrease under the condition of large liquid volume and high recovery rate. In view of this reservoir condition, we take C oilfield as an example to carry out the oilfield development effect under the condition of large liquid volume and high-speed production, and analyze the influence of high-speed production and medium low-speed production on recovery rate of similar heavy oil bottom water-reservoir. The results show that the rising trend of water cut in oilfield is the same whether high-speed development with large liquid volume or conventional low-speed development is adopted. Under the condition of high liquid production, the sweep efficiency of water flooding is high in the same period of time, which has certain advantages of enhanced oil recovery. The development mode of early large liquid production is explored, which provides certain guidance for the efficient development of heavy oil reservoir with bottom water.
Highlights
The natural energy of the reservoir can keep the superior condition that the formation energy does not decrease under the condition of large liquid volume and high recovery rate. In view of this reservoir condition, we take C oilfield as an example to carry out the oilfield development effect under the condition of large liquid volume and high-speed production, and analyze the influence of high-speed production and medium low-speed production on recovery rate of similar heavy oil bottom water-reservoir
C oilfield is dominated by thin-layer heavy oil reservoir with strong bottom water
Based on the production law of heavy oil bottom water-reservoir, this paper summarizes the development effects of different development strategies in the early stage of oilfield development
Summary
C oilfield is dominated by thin-layer heavy oil reservoir with strong bottom water. The average effective thickness of oil layer is 11 m. The comprehensive water cut is 96.1% and the recovery degree is 10.3% The core of this kind of reservoir development is how to expand sweep, increase reserves and effectively produce. Taking Minghuazhen Formation sand body of C oilfield as the key research object, this paper studies the influence of liquid production rate on oil recovery. It mainly includes the following aspects: 1) analyzing the historical production dynamic characteristics of sand body in upper Ming section of C oilfield; 2) analyzing the influence of fluid production rate on oil recovery by using mathematical model analysis; 3) comparing the production effect of high and low speed in actual oilfield
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