Abstract
The water flooding characteristic curve method is one of the essential techniques to predict recoverable reserves. However, the recoverable reserves indicated by the existing water flooding characteristic curves of low-amplitude reservoirs with strong bottom water increase gradually, and the current local recovery degree of some areas has exceeded the predicted recovery rate. The applicability of the existing water flooding characteristic curves in low-amplitude reservoirs with strong bottom water is lacking, which affects the accurate prediction of development performance. By analyzing the derivation process of the conventional water flooding characteristic curve method, this manuscript finds out the reasons for the poor applicability of the existing water flooding characteristic curve in low-amplitude reservoir with strong bottom water and corrects the existing water flooding characteristic curve according to the actual situation of the oilfield and obtains the improvement method of water flooding characteristic curve in low-amplitude reservoir with strong bottom water. After correction, the correlation coefficient between frac{{k_{ro} }}{{k_{rw} }} and S_{w} is 95.92%. According to the comparison between the actual data and the calculated data, in 2021/3, the actual water cut is 97.29%, the water cut predicted by the formula is 97.27%, the actual cumulative oil production is 31.19 × 104t, and the predicted cumulative oil production is 31.31 × 104t. The predicted value is consistent with the actual value. It provides a more reliable method for predicting low-amplitude reservoirs' recoverable ability with strong bottom water and guides the oilfield's subsequent decision-making.
Highlights
According to the comparison between the actual data and the calculated data, in 2021/3, the actual water cut is 97.29%, the water cut predicted by the formula is 97.27%, the actual cumulative oil production is 31.19 × 1 04t, and the predicted cumulative oil production is 31.31 × 1 04t
The corresponding a and b values can be obtained, and the water content calculated by the formula (31) is compared with the actual water content (Fig. 5)
The calculated cumulative oil production is in good agreement with the actual cumulative oil production (Fig. 6)
Summary
Water flooding characteristic curve of Maкcимoв M. (6) the initial conditions are satisfied Sw = Swi , foe = 1 (Replace Sw = Swi into (1). Under the condition that the formation pressure is maintained by water injection and the reservoir is relatively homogeneous, it can be seen from the material balance equation that: Sw = Np 1 − Swi + Swi (12) N. The oil–water relative permeability ratio formula is: Kro∕Krw = r∕ Sw − Swi ∕m (17). The higher the water content, the better the fitting degree It is suitable for lowamplitude reservoirs with strong bottom water. Through the formula derivation the relationship between kkrrwo and Sw is obtained. Using new water flooding characteristic curve to predict cumulative oil production NP. This section uses the water flooding characteristic curve in Sect.
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