新疆石油地质 ›› 2020, Vol. 41 ›› Issue (3): 302-306.doi: 10.7657/XJPG20190607

• 油藏工程 • 上一篇    下一篇

克拉2气田水侵规律及模式

吴永平, 杨敏, 李明, 孙勇, 张永宾, 王好   

  1. 中国石油 塔里木油田分公司 勘探开发研究院,新疆 库尔勒 841000
  • 收稿日期:2019-01-29 修回日期:2019-07-08 出版日期:2020-06-01 发布日期:2019-12-01
  • 作者简介:吴永平(1979-),男,青海湟中人,高级工程师,博士,石油地质,(Tel)0996-2174787(E-mail)wuyp- tlm@petrochina.com.cn
  • 基金资助:
    国家科技重大专项(2016ZX05051-004);国家科技重大专项(2016ZX05015006-004)

Laws and Models of Water Invasion in Kela 2 Gas Field

WU Yongping, YANG Ming, LI Ming, SUN Yong, ZHANG Yongbin, WANG Hao   

  1. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China
  • Received:2019-01-29 Revised:2019-07-08 Online:2020-06-01 Published:2019-12-01

摘要:

克拉2气田是中国探明储量最大的整装超高压干气气藏,2010年以来该气田因地质原因,先后有7口井出水,使气田长期稳产面临极大风险,深化气田的水侵规律认识,确定其水侵模式,显得尤为重要。对克拉2气田水侵总体特征进行分析,确定西南部、北部、中部和东部4个不同水侵模式区域。针对不同区域的见水井,分别对井旁断裂发育程度、高渗条带与隔夹层匹配关系和距边底水距离进行分析,明确水侵主控因素;通过断层封堵性评价、动态追踪试井和套后饱和度时间推移对比,确定主要来水方向;结合生产动态特征和地质模型历史拟合,落实见水井的水侵模式,将单井水侵模式划分为底水纵窜横侵型、边水横侵型和底水上侵型3种类型。通过数值模拟,对未见水井进行水侵模式预判,并针对不同的水侵特点,提出具体防水治水开发对策,以保障克拉2气田持续高效开发。

关键词: 克拉2气田, 水侵模式, 水侵规律, 开发对策, 数值模拟

Abstract:

Kela 2 gas field in Tarim basin is a massive ultra-high-pressure dry gas reservoir with the largest proved reserves in China. Since 2010, water breakthrough due to geological conditions has been found in seven wells, which brings risks to the steady production of the gas field. Therefore, it is very important to understand the laws and to identify the models of water invasion in the gas field. This paper analyzes the general characteristics of water invasion in the gas field, and determines four regions with different water invasion models. Regarding the watered-out wells in the different regions, the fracture development degree, the relationship between high-permeable zone and interlayer and the distance from high-permeable zone to edge/bottom water are analyzed and the main factors controlling water invasion in watered-out wells are identified. The main direction of incoming water is determined through fault plugging capacity evaluation, dynamic tracking well test analysis and post-casing saturation time comparison. Combined with production performance and history matching of geological model, the water invasion models are determined and the model in single well can be divided into three types such as vertical channeling and lateral invasion of bottom water, lateral invasion of edge water and invasion upwards of bottom water. Based on the numerical simulation of the gas reservoir, the water invasion models in non-watered-out wells can be predicted and a detailed development strategy is proposed to ensure the continuous and efficient development of the Kela 2 gas field.

Key words: Kela 2 gas field, water invasion model, water invasion law, development strategy, numerical simulation

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