摘要
大牛地气田属致密砂岩气田,剩余未动用储量品位差、有效厚度薄、纵向叠合程度低,采用水平井开发效果较好,但国内没有成熟的开发技术和经验。因此,优化研究水平井开发技术政策,完善气藏工程配套技术显得尤为重要。为此,基于经验公式、动态分析、数值模拟、经济评价等方法,对水平井整体开发动用条件下的产能评价、单井设计、井网井距等开发技术政策进行了优化研究,明确了层系划分原则,确定了多种产能评价方法,明确了气井配产比例为无阻流量的1/5-1/3,水平段长1 000-1 200 m,轨迹应垂直于最大主应力方向并尽量位于储层中部,压裂缝设计应参照定量计算模型,井网采用排状交错井网,井距800-1 200 m,废弃地层压力8 MPa,采收率40%。形成的气藏工程优化技术,已应用于大牛地气田水平井整体开发方案中,为方案成功实施提供了技术保障。
Daniudi gas field is a typical tight sandstone gas reservoir. The remaining non-produced reserves are characterized by poor quality,thin net pay thickness and poor vertical superimposition of pay zones. For these types of reservoirs,it is critical to optimize technical policy of horizontal well development and perfect gas reservoir engineering technique series. Empirical formula,dynamic performance analysis,numerical simulation and economic evaluation were used to optimize technical policies including productivity evaluation,single well design,well pattern and spacing and other aspects regarding horizontal well development. We defined the principles of strata series classification and selected mutiple methods of productivity evaluation. The study shows that the gas production should be proportionally 1 /5 - 1 /3of open-flow capacity,and the lateral should be 1 000 - 1 200 meter long. The well trajectory should be perpendicular to the maximum principal stress and be located as close as possible to the center part of the reservoir. The fracturing design should refer to the quantitative calculation model. The well pattern should be staggered line-drive with a well spacing of 800 - 1 200 meter. The abandonment formation pressure should be 8 MPa. All these factors would finally yield a recovery factor of 40 %. The optimized parameters have been applied to the Daniudi gas field,and they provided a strong technical foundation for the successful implementation of the development plan in this tight sandstone gas reservoir.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2016年第2期261-266,共6页
Oil & Gas Geology
基金
国家科技重大专项(2011ZX05045)
关键词
开发技术政策
低渗透
气藏工程
水平井
大牛地气田
鄂尔多斯盆地
technical policy for development
low permeability
gas reservoir engineering
horizontal well
Daniudi gas field
Ordos Basin
