Comparative analysis of water drive curve and identification of stable water drive segment in strong bottom water sandstone reservoir of the Tahe Oilfield
The Triassic strong bottom-water sandstone oil reservoirs in Block A of the Tahe Oilfield are buried deep,with abundant natural energy and complex interlayer distribution.During the late development stage,the phenomenon of bottom-water coning is prominent,leading to a rapid production decline and significant changes in water cuts.There are many uncertainties in the application of conventional waterflooding curves.Regarding the application of waterflooding curves,this study first statistically analyzed the water cut rise characteristics of the oil reservoirs in Block A of the Tahe Oilfield,categorized the water cut change curve patterns of each well,and summarized four main water cut rise patterns.Subsequently,a comparative analysis was conducted on the application effects of different waterflooding curves,and it was revealed that there were significant errors in the selection of the stable waterflooding intervals.Therefore,to accurately identify the stable waterflooding intervals,the derivative curve of the waterflooding curve was used to recognize the stable waterflooding intervals,which can greatly reduce errors.Consequently,a waterflooding pattern chart for Block A of the Tahe Oilfield was established.The statistical results show that the precision of curve fitting for the stable waterflooding intervals identified by the derivative curve is higher than the average fitting precision of straight-line segments in conventional waterflooding curves.
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