巴林油田统一场成分流体模型

A. Al-Muftah
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引用次数: 0

摘要

巴林油田的特点是流体性质在横向和纵向上都有很大的变化,油的重力范围在- 9到80°API之间。低API原油主要分布在构造侧翼和上部储层单元内,而高API原油则是来自Hith和Arab等深层地层的凝析油。最深的储层是含气的Khuff。它的API值为50°,与巴林油田的其他部分形成了一种独立的流体类型。本文的目的是为整个粗重力范围导出一个单一的成分预测器。这个统一的模型排除了Aruma和Khuff凝析油中的沥青,它们的成分不同。该研究的一个成果是,通过对巴林油田大量试井的平均数据进行数学重组,预测储层流体与试井气油比(GOR)和API比重的关系。观察到储层流体中甲烷组分随饱和压力的强烈变化趋势,因此可以构建重组的储层流体,从而预测饱和压力、地层体积分数(FVF)和粘度。该流体模型用于初始化天然气厂评价、混相驱评价的成分模型,并确定饱和压力等于储层压力时的最大GOR。统一流体模型的另一个结果是在给定目标饱和压力和API的情况下构建储层流体组成。该信息用于构建用于实验室合成原油和天然气的代表性流体,用于活体油实验。作为该过程的一部分,进行了一系列质量检查,以确定遇到的流体是否在历史生产原油的范围内(例如,受到空气或举升气体的污染),并能够构建用于油藏模拟的流体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unified Field Compositional Fluid Model for the Bahrain Field
The Bahrain Field is characterized by large lateral and vertical variations in fluid properties, with oil gravity ranging between −9 and 80 °API. The lower API crudes are encountered mostly on the structural flanks and within the upper reservoir units, while the highest API crudes are condensates from deeper formations such as Hith and Arab. The deepest reservoir is the gas-bearing Khuff. It has 50 °API condensate and forms a separate fluid type from the rest of the Bahrain Field. The objective of this paper is to derive a single compositional predictor for the entire range of crude gravities. Excluded from this unified model are bitumens from Aruma and Khuff condensates, which are compositionally different. One outcome of this study was to predict the reservoir fluid as a function of well test Gas Oil Ratio (GOR) and API gravity by mathematical recombination of averaged data from abundant well tests across the Bahrain Field. A strong trend of methane fraction in the reservoir fluid versus saturation pressure has been observed, and thus it has been possible to construct the recombined reservoir fluid and then predict saturation pressures, Formation Volume Fraction (FVF), and viscosity. This fluid model was used to initialize compositional models for gas plant evaluations, miscible flood evaluations, and to determine the maximum GOR at which saturation pressure equals reservoir pressure. Another outcome of the unified fluid model was to construct a reservoir fluid composition given a target saturation pressure and API. This information is used to construct representative fluids for laboratory synthesis of crudes and gas for live oil experiments. As part of the process, a number of quality checks were constructed to determine if the fluid encountered is in range of historic produced crudes (e.g. contamination by air or lift gas) and enable construction of fluids for reservoir simulation.
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