摘要
受海上低渗气藏DST测试费用高、难度大的限制,用MDT压降流度评价低渗气藏产能成为海上气田主要手段之一,但MDT测取的通常是钻井液滤液流度,进行产能评估时不准确。在分析低渗气藏钻井液滤液侵入机理的基础上,提出了利用MDT压降流度计算气相渗透率的方法,推导了两者的理论关系式,并以东海低渗气田稳态法实验数据为基础建立了地区经验关系式。通过与东海低渗气藏DST测试结果及岩心分析结果的对比,验证了本文方法的正确性,从而为海上气田探井随钻过程中气藏产能评估提供了一种新的途径和方法。
Drawdown fluidity tested by MDT prevails as the high cost and low feasibility of DST in offshore low permeability gas reservoir. However, the measurement of MDT often refers to mud filtrate fluidity and cannot accurately evaluate productivity. A method to calculate gas phase permeability with drawdown fluidity tested by MDT is presented based on the analysis of mud filtrate invasion mechanism in low-perme- ability gas reservoir and their relations are derived. An empirical formula is established based on the exper- imental data from steady-state method in low permeability gas reservoir of the East China Sea. The method is validated by compared with the DST result and core analysis of low-permeability gas reservoir in the East China Sea, This method provides a new way to evaluate productivity of gas reservoir during drilling process in offshore gas field.
出处
《中国海上油气》
CAS
CSCD
北大核心
2015年第6期53-56,共4页
China Offshore Oil and Gas
关键词
低渗气藏
产能
MDT
压降流度
气相渗透率
稳态法
low permeability gas reservoir
productivity
MDT
drawdown fluidity
gas phase permeability
steady-state method
