长岭火山岩气藏水平井开发技术

火山岩气藏一般具有岩石类型繁多、岩性岩相复杂、孔喉结构杂乱、低孔低渗、储层非均质性极其严重等特征.针对火山岩气藏地质特征复杂和开发难度大的特点,对吉林长岭火山岩气田地质特征进行深入研究,分析论证了水平井在提高单井产能、产能替换比、面积替换比和单井控制储量等方面的技术要素.将这些技术要素与直井进行对比,结果表明,利用水平井技术开发火山岩气藏是可行的.

Development techniques of the horizontal wells in Changling volcanic gas reservoir

For recent years,the volcanic gas reservoirs are discovered in China and developed in succession.Normally,the volcanic gas reservoirs are characterized by various rock types,complex lithologies and lithofacies,multifarious pore and throat structures,low porosity and permeability,and extremely serious heterogeneity,etc.Due to the complex geologic characters and huge development difficulty of the volcanic gas reservoirs,Changling volcanic gas reservoirs being taken as an example,and the technical factors of the horizontal wells increasing single-well productivity,productivity replacement ratio,area replacement ratio and single-well control reserves are analyzed.Comparing the technical factors of the horizontal well with those of vertical well,it is shown that the horizontal wells are more effective in the development of volcanic gas reservoirs and the vertical wells.