摘要
低渗砂岩气藏的地质特征主要表现为非均质性严重、孔喉半径小、泥质含量高和含水饱和度高 ;其开发特点为 :气井自然产能普遍较低且分布极不均衡 ,生产压差大 ,稳产条件差 ,大部分井投产前需要进行加砂压裂改造 ;其相应的开发对策是开展气藏精细描述 ,确定各类储层的分布范围 ;在布井方式上采用非均匀高点布井和加密井网布井方式 ;加强钻井、完井过程中的气层保护措施 ;提高加砂压裂效果 ,改善储层渗流能力 ;做好开发早中期工作 ,开采后期采用增压开采和排水采气开采方式以延长气井生产寿命。
The main geologic characteristics of low permeability sandstone gas reservoirs are high antisotropic,small pore-throats radius,high shale content and high water saturation.Its exploitation's characteristics are:the natural productivity of gas wells are generally low and distribution is non-equilibrium,the producing pressure differential is high ,the condition of stable production are bad,it is necessary for a majority of gas wells to sand fracturing before they are putted into production.Its offtake strategy are:the techniques of gas reservoirs fine description are used to determine the distribution area of all sorts of reservoirs,dense well pattern in high-permeability area and infill drilling are used in hole pattern,the technologies of preventing gas reservoir are emphasized during drilling and well completion,the effect of sand fracturing is increased to improve permeable capacity of gas reservoir,and adopting superchange method and drainage gas recovery method prolong producing time of gas well in late production period.
出处
《钻采工艺》
CAS
2004年第4期103-106,共4页
Drilling & Production Technology
关键词
砂岩气藏
气井
非均质性
布井方式
储层
胶结物
low permeability sandstone gas reservoir, geologic characteristics,offtake strategy,gas well deliverability
