Abstract
The oil production predicted by means of the conventional water-drive characteristic curve is typically affected by large deviations with respect to the actual value when the so-called high water-cut stage is entered. In order to solve this problem, a new characteristic relationship between the relative permeability ratio and the average water saturation is proposed. By comparing the outcomes of different matching methods, it is verified that it can well reflect the variation characteristics of the relative permeability ratio curve. Combining the new formula with a reservoir engineering method, two new formulas are derived for the water flooding characteristic curve in the high water-cut stage. Their practicability is verified by using the production data of Mawangmiao and Xijiakou blocks. The results show that the error between the predicted cumulative oil production and production data of the two new water drive characteristic curves is less than the error between the B-type water drive characteristic curve and the other two water drive characteristic curves. It is concluded that the two new characteristic curves can be used to estimate more accurately the recoverable reserves, the final recovery and to estimate the effects of water flooding
Highlights
Calculating the formulas for the traditional water flooding characteristic curves A and B is straightforward, as is understanding the physical significance of the essential quantities [1]
The standard water flooding characteristic curve accurately predicts the dynamic index of the development of the oil field during the middle-middle and high water cut periods, but not once the oil field enters the high water cut period [2,3]
This study presents a new relative permeability ratio characterization relationship that is highly correlated with the curved region of the rear section of the normalized relative permeability ratio curve
Summary
Calculating the formulas for the traditional water flooding characteristic curves A and B is straightforward, as is understanding the physical significance of the essential quantities [1]. The new water driving characteristic curve is proved to be capable of forecasting an oil field’s development performance under periods of extreme water scarcity, as well as recoverable reserves and recovery factors. It may provide a more dependable basis for accurately forecasting the development performance of the JH oil field during a period of high water cut. Non-exponential bending, on the other hand, will occur during the early and late stages of production in waterflooding oil fields As a result, this formula does not apply to periods of low, high, or ultra-high water cut. Formula (2) is used to compare this conclusion to the normalized phase permeability data for the actual block of the JH oilfield (Fig. 1)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
