Water production analysis and reservoir simulation of the Jilake gas condensate field

Abstract

The development of the Jilake gas condensate field is dominated by production of old wells, with complication of well status, serious impact of edge-bottom water, and difficulty in development and adjustment. Through integration of formation water salinity analysis, color and density change of oil samples, diagnostic curve characteristic of modern production decline analysis and characteristic analysis of production water, the reason for water production is analyzed as follows: gas wells with low water production are affected by local connate water, while gas wells with high water production are influenced by the bottom-edge water. Integrated with domestic and overseas modeling of oil rim gas condensate reservoir, the fine geological model is built by Petrel geo-modeling software, and the approaches of non-equilibrium initialization and parameters initial value assignment is used to form the initialization model of the gas condensate field, in order to correctly portrait the oil rim and local connate water. On the basis of single-well water production analysis, the geological model is corrected through performance dynamic history match. The result provides a base and foundation for later development adjustment of this gas condensate field. 摘要: 针对吉拉克凝析气田目前基本采用老井生产, 井况复杂, 边底水影响严重, 开发调整难度大等实际情况, 基于对气田综合地层水矿化度、油样颜色变化和油样密度变化、现代产量递减分析诊断曲线以及单井产水特征等的研究, 对气藏单井产水原因进行了分析, 认为低产水井受局部非均质性形成的共存水影响、高产水井受边底水影响而产水。为了正确表征油环及局部共存水的分布特点, 综合国内外带油环凝析气藏建模方法, 利用Petrel软件建立该气藏精细地质模型, 并采用非平衡初始化方法及赋初始参数场的形式建立了气藏初始化模型。在单井产水分析基础上, 通过数值模拟历史拟合对模型进行修正, 为后期气藏开发调整提供了基础和依据。 Key words: water production analysis, gas condensate field, reservoir simulation, oil rim, bottom-edge water