油田合理储采比界限预测方法

doi:10.7657/XJPG20200316

摘要/Abstract

摘要：

为了评价油田目前的储采状况是否合理,根据储采比定义、产量递减率与产液量的关系、产量递减率与含水率的关系,建立了储采比与产液增长率、含水率上升值以及储采平衡系数的关系,预测不同开发方式下储采比变化趋势。此外,建立了理想状况下不同年份储采比变化公式和合理储采比界限预测图版,结合油田开发实际,将油田开发到极限含水率时的储采比分为合理、相对合理、不合理和极不合理4类,通过油田开发到极限含水率时的合理储采比范围,确定合理储采比界限。对某开发区块A进行计算,假设其他条件保持不变,在含水率达到96.2%时,储采比降至负值,说明目前的储采比偏低,确定合理储采比界限约为8.2.为确定油田合理储采比界限提供了新的参考,通过评价油田目前储采状况合理性,为开发方案调整提供依据。

关键词: 储采比, 开发方式, 预测方法, 储采平衡系数, 递减率, 产液量, 含水率

Abstract:

In order to evaluate whether the reserve-production ratio of an oilfield is reasonable or not, according to the definition of reserve-production ratio,the relationship among production decline rate and liquid production, the relationship between production decline rate and watercut, the paper establishes the relationships between the reserve-production ratio and produced fluid, watercut rise and reserve-production equilibrium coefficient, respectively, and predicts the trends of reserve-production ratio in different development modes. Additionally, the paper establishes an annual reserve-production ratio formula under the ideal conditions and charts of rapid prediction of reasonable reserve-production ratio, divides the reserve-production ratio at the limit watercut into 4 categories including reasonable, relative reasonable, unreasonable and extremely unreasonable reserve-production ratio and then determines the reasonable reserve-production ratio. Applying this method into a block and assuming that other conditions remain unchanged, the reserve-production ratio is already negative when the watercut reaches 96.2%, indicating a relatively low reserve-production ratio. Finally, the reasonable reserve-production ratio is determined as 8.2, which provides new references for reasonable reserve-production ratio limit determination in oilfields and countermeasures for development plan adjustment based on the rationality evaluation of the current reserve-production status of oilfields.

Key words: reserve-production ratio, development method, prediction method, reserve-production equilibrium coefficient, decline rate, liquid production, watercut

中图分类号:

TE341

王禄春, 赵鑫, 李金东, 孙志杰, 薛睿. 油田合理储采比界限预测方法[J]. 新疆石油地质, 2020, 41(3): 355-358.

WANG Luchun, ZHAO Xin, LI Jindong, SUN Zhijie, XUE Rui. A Method to Predict Reasonable Reserve-Production Ratio Limit for Oilfields[J]. Xinjiang Petroleum Geology, 2020, 41(3): 355-358.

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