西湖凹陷气藏出水规律及控制因素

发布时间：2018-04-03 21:06

本文选题：水驱气藏　切入点：水侵识别　出处：《岩性油气藏》2017年06期

【摘要】：东海西湖凹陷已开发的气藏以水驱气藏为主,大部分气井投产后2~3年开始出水,产量递减快,因此,正确认识边底水气藏的出水规律及控制因素,是成功开发该类气藏的关键。以西湖凹陷生产动态数据为基础,利用产水特征参数判别法和不稳定试井水侵识别法研究了气井的产水特征及水气比上升规律,形成了水驱气藏早期水侵综合识别方法,明确了不同类型水驱气藏的含水上升规律及主控因素。依据气井无水采气期长短及含水上升规律,可将水驱气藏产水特征曲线归结为3种类型,分别为尖峰状竖型、梯状台阶型、凹状缓慢型,其中尖峰状竖型主要受水体大小影响,以强边水气藏为主;梯状台阶型主要受隔夹层发育程度及韵律特征影响,以隔夹层不发育的底水气藏为主;凹状缓慢型主要受储层及水体大小影响,以弱水驱气藏为主。水驱气藏出水规律及控制因素的研究,为水驱气藏开发技术政策的制定奠定了基础。
[Abstract]:The developed gas reservoirs in Xihu sag in the East China Sea are mainly water-driven gas reservoirs, most of which come out of water 2 ~ 3 years after putting into production, and the production decreases rapidly. Therefore, the key to the successful development of this kind of gas reservoirs is to correctly understand the outlet law and control factors of the marginal and bottom water gas reservoirs.Based on the production dynamic data of Xihu sag, the characteristics of water production and the rising law of water-gas ratio of gas wells are studied by using the method of distinguishing characteristic parameters of water production and identification of water invasion in unstable test wells, and the comprehensive identification method of water invasion in early stage of water-drive gas reservoirs is formed.The water cut rising law and main controlling factors of different types of water drive gas reservoirs are defined.According to the length of gas recovery period and the rising rule of water cut in gas wells, the water production characteristic curves of water-driven gas reservoirs can be divided into three types, namely, the peak vertical type, the ladder step type, the concave slow type, among which the sharp peak vertical type is mainly affected by the water body size.The ladder type is mainly influenced by the development degree and rhythm of the interlayer, the bottom water gas reservoir which is not developed by the interlayer, the concave type is mainly affected by the reservoir and the water body size, and the weak water drive gas reservoir is the main type.The study of water flow law and control factors of water drive gas reservoir lays a foundation for the formulation of water drive gas reservoir development technology policy.
【作者单位】：中海石油(中国)有限公司上海分公司研究院;
【基金】：国家重大科技专项“东海厚层非均质性大型气田有效开发关键技术”(编号:2016ZX05027004)资助
【分类号】：TE37

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