水侵枯竭气藏型储气库运行初期合理配注方法

发布时间：2019-05-08 09:12

【摘要】：在早期建设的水侵枯竭气藏型地下储气库投产之初,以节点压力综合评价方法确定的注气能力来进行配注。但由于对储气库短期高速渗流特征认识不清,注气量大且速度过快,导致气驱水前缘非均匀稳定外推,对有效库容恢复和扩容达产效率均会产生不利影响。为此,通过室内机理分析和注采动态跟踪研究,明确了地层亏空程度、气水分布特征、地层倾角、注气井控半径是影响储气库配注的主要地质因素。利用气水地层渗流基本理论和物质平衡原理,以注气驱替气水界面稳定运移气体临界渗流速度和注气井控范围内地层吸气能力为约束,借鉴国外储气库注气量优化设计经验,建立了水侵枯竭气藏型储气库投产运行初期合理配注方法,成功指导了国内某地下储气库投产方案的设计。该储气库实际运行效果表明:经过3个周期运行,注气驱替效果好,稳定扩容,达容率超过85%,预计第4周期将达到90%。结论认为,所建立的配注方法具有一定的适用性,为国内同类型储气库投产方案设计提供了科学依据。
[Abstract]:At the beginning of the early construction of the underground gas storage with water invasion and depletion gas reservoir, the gas injection capacity determined by the comprehensive evaluation method of nodal pressure was used to mix the gas. However, due to the lack of clear understanding of the short-term high-speed seepage characteristics of gas storage, large gas injection rate and excessive speed, the uneven and stable extrapolation of the front edge of gas flooding will have adverse effects on the recovery of effective reservoir capacity and the efficiency of capacity expansion. Therefore, through the analysis of indoor mechanism and the study of injection-production dynamic tracking, it is clear that the main geological factors affecting the injection distribution of gas storage are the formation porosity, the gas-water distribution characteristics, the formation dip angle and the control radius of the gas injection well. Based on the basic theory of percolation in gas-water formation and the principle of material balance, the critical velocity of steady migration of gas at the gas-water interface and the suction capacity of formation within the control range of gas injection well control are constraints, and the experience of gas injection optimization design in foreign gas storage is used for reference. The rational injection method was established in the initial stage of the operation of the gas storage with water invasion and depletion, and the design of the commissioning scheme of an underground gas storage in China was successfully guided. The actual operation results of the gas storage show that after three cycles of operation, the gas injection displacement effect is good, the capacity expansion is stable, the capacity reach rate is more than 85%, and the fourth cycle is expected to reach 90%. It is concluded that the established injection allocation method has certain applicability and provides a scientific basis for the design of the commissioning scheme of the same type of gas storage in China.
【作者单位】：中国石油勘探开发研究院廊坊分院;中国石油天然气集团公司油气地下储库工程重点实验室;中国石油新疆油田公司勘探开发研究院;中国石油长庆油田公司储气库管理处;中国石油大港油田公司第四采油厂;
【基金】：中国石油天然气集团公司重大科技专项“地下储气库地质与气藏工程关键技术研究与应用”(编号:2015E—4002)
【分类号】：TE972

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