石油与天然气地质 ›› 2016, Vol. 37 ›› Issue (1): 125-128.doi: 10.11743/ogg20160117

• 油气开发 • 上一篇    下一篇

致密砂岩气藏井网加密潜力快速评价方法

严谨1,2, 史云清1,2, 郑荣臣1,2, 王树平1,2   

  1. 1. 中国石化海相油气田开发重点实验室, 北京 100083;
    2. 中国石化石油勘探开发研究院, 北京 100083
  • 收稿日期:2015-04-24 修回日期:2015-12-25 出版日期:2016-02-08 发布日期:2016-03-02
  • 第一作者简介:严谨(1973-),女,高级工程师,气藏工程研究。E-mail:yanjin.syky@sinopec.com。
  • 基金项目:
    国家科技重大专项(2011ZX05045);中国石化科技攻关项目(P12101)。

Quick evaluation methodology of infill drilling potential in tight sandstone gas reservoirs

Yan Jin1,2, Shi Yunqing1,2, Zheng Rongchen1,2, Wang shuping1,2   

  1. 1. SIINOPEC Key Laboratory for Marine Oil and Gas Exploration, Beijing 100083, China;
    2. Petroleum Exploration & Production Research Institute, SINOPEC, Beijing 100083, China
  • Received:2015-04-24 Revised:2015-12-25 Online:2016-02-08 Published:2016-03-02

摘要: 致密砂岩气藏地质条件复杂,采收率较低,国内外开发实践表明井网加密已成为此类气田提高采收率的关键技术。针对致密砂岩气藏开发井数多、快速评价井网加密潜力数值模拟方法不经济、地质统计法和移动窗口法评价结果与实际差异较大等问题,综合地质研究与气井动态资料,采用不稳定流动分析方法,建立井网密度与单井增加可采储量的关系。从加密井单井增加可采储量出发,结合经济学原理,建立了加密效益函数,能够快速准、确预测出开发区是否具有加密潜力及加密潜力大小,为气田调整挖潜决策提供可靠依据。实例应用结果表明,大牛地气田DK13井区山西组1段天然气在目前成本和价格下,经济最佳井网密度为2.2口/km2,经济极限井网密度为7.06口/km2,加密潜力较大。

关键词: 动态分析, 井网密度, 可采储量, 采收率, 致密砂岩气藏

Abstract: Recovery factor of tight sandstone gas reservoir is low due to disadvantageous geological condition.Domestic and overseas development practices indicate the importance of infill drilling for EOR.Several methods including numerical simulation,geostatistical analysis and moving split-window are available for rapid evaluation of in-fill drilling potential.However,the numerical simulation method is high in cost,and the geostatistical analysis and moving split-window methods are not accurate.In this paper,a functional relationship is established between well spacing density and incremental recoverable reserve of single well based on geological data and dynamic behavior analysis.The infill drilling profit function is developed based on economic principles.The proposed quick evaluation method can be used to evaluate the potential of infill drilling and support decision making in development adjustment and potential tapping of tight gas reservoirs.Case study result shows great infill drilling potential in DK13 Block in Daniudi gas field, the optimal economic well spacing density is 2.2 wells/km2, the economic limit well spacing density is about 7.06 wells/km2 under current oil price and operation cost.

Key words: dynamic analysis, recoverable reserve, well spacing density, recovery, tight sandstone gas reservoir

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