Predicting gas-cap and tar-mat formation conditions in hydrocarbon reservoirs. Application of Continuous Thermodynamics

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2024-10-29 DOI:10.1016/j.fluid.2024.114276

Ana Cristina Ramirez-Gallardo, I. Garcia-Cruz, C. Lira-Galeana

引用次数: 0

Abstract

A method to predict the gas/oil (GOC) and oil/tar (OTC) fluid contacts of reservoir fluid columns containing heavy fractions and asphaltenes is presented. A new formulation and solution to the gravitational equilibrium equations in terms of the method of moments, and the use of an equation of state for semicontinuous mixtures are shown to provide a robust and consistent method to describe the variation of pressure, reservoir fluid composition and heavy-ends molecular weights with depth, as well as the location of the fluid contacts of a petroleum reservoir. Use of the new method is first illustrated by locating the GOC of a (continuous) ideal reservoir described by Raoult´s law, and by predicting the GOC and OTC of two reservoir systems where measured data are available. The good agreement of the new method with measured gradients shows the adequacy of the proposed approach.

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预测碳氢化合物储层中的气帽和焦油毡形成条件。连续热力学的应用

介绍了一种预测含有重馏分和沥青质的储层流体柱的气/油（GOC）和油/焦油（OTC）流体接触的方法。通过对矩量法重力平衡方程的新表述和求解，以及对半连续混合物状态方程的使用，可以提供一种稳健、一致的方法来描述压力、储层流体成分和重馏分分子量随深度的变化，以及石油储层流体接触点的位置。新方法的使用首先通过确定一个由拉乌尔定律描述的（连续）理想储层的 GOC 位置，然后通过预测两个有测量数据的储层系统的 GOC 和 OTC 来说明。新方法与测量梯度的良好一致性表明了所建议方法的适当性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.