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在委内瑞拉Monagas北部大油藏进行了水驱(自从1993年以来)和注气(自从1998年以来),以便保持产量。目前采油量约为1·3355×104m3/d。这些非均质严重的高压高温油藏埋藏较深,并且流体组分随深度变化。为了增加这些油藏的储量,分析了应用提高采收率(EOR)工艺的可行性。提出了一种综合方法以便评价和选择能够在Monagas北部实施的EOR工艺。该方法以经济标准、采收率和风险分析为基础,为三个阶段。在第一阶段,综合应用预选所有可应用EOR工艺的多种分析方法。第二阶段用1D和2D数值模拟模型,通过进行平面、垂向和驱替波及效率评价来确定每个预选EOR工艺的不确定性。在第三阶段,以全油藏规模评价每种EOR工艺,并且进行风险分析,风险分析随着第二阶段的结果而变化。本文介绍了评价和选择用于非均质严重和复杂油藏EOR工艺的具体方法,该方法把常规分析、数值模拟和风险分析综合成决策工具。
Water flooding (since 1993) and gas injection (since 1998) were carried out in the large northern Monagas, Venezuela, in order to maintain production. The current oil production is about 1.3355 × 104m3 / d. These heterogeneous, severe HPHT reservoirs are buried deeper and the fluid composition varies with depth. In order to increase the reserves of these reservoirs, the feasibility of applying an EOR process was analyzed. An integrated approach is proposed to evaluate and select EOR processes that can be implemented in the north of Monagas. The method is based on economic criteria, recovery rates and risk analysis and is in three phases. In the first phase, a comprehensive selection of pre-selected methods for all analytical EOR processes is available. The second phase uses 1D and 2D numerical simulation models to determine the uncertainty of each preselected EOR process by performing planar, vertical, and displacement-sweep efficiency evaluations. In the third stage, each EOR process is evaluated on a full reservoir scale and a risk analysis is performed. The risk analysis changes with the results of the second stage. This paper presents specific methods for evaluating and selecting EOR processes for heterogeneous severe and complex reservoirs that combine routine analysis, numerical modeling and risk analysis into decision tools.