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近年来在松辽盆地和准噶尔盆地火山岩气藏勘探取得重大突破,探明储量超过3000亿方,远景资源量超过万亿方。火山岩气藏埋藏深,地质条件复杂,储层物性差,平面非均质性强,应用常规直井有效开发面临巨大挑战。2007年完钻的升深-平1井是国内第一口火山岩气藏水平井,取得良好的开发效果。文中调研了目前已完钻22口火山岩气藏水平井实施效果和生产动态。从气藏地质、钻井工程和储层改造等三个方面出发分析水平井的适应性:火山岩气藏水平井开发单井控制储量达到一定规模,气井钻遇Ⅰ一类储层,开发效果较好;欠平衡钻井、地质导向等新技术的应用有利于提高气井开发效果;水平井分段压裂改造能有效改善井底渗流条件,大幅提高单井产量。开发实践说明水平井对于火山岩气藏开发具有一定的优势,在气藏条件较好的区块中可以适度规模应用水平井开发。
In recent years, significant breakthroughs have been made in the exploration of volcanic gas reservoirs in the Songliao Basin and Junggar Basin, with proved reserves exceeding 300 billion cubic meters and long-term resources exceeding one trillion cubic meters. Volcanic gas reservoirs are deep buried, complicated geological conditions, poor reservoir physical properties and planar heterogeneity, and the application of conventional vertical wells is facing great challenges. Completion of drilling in 2007 - Ping 1 well is the first horizontal volcanic gas reservoir wells, and achieved good development results. In this paper, we have investigated the implementation effect and production dynamics of horizontal wells drilled in 22 volcanic gas reservoirs. The adaptability of horizontal wells is analyzed from three aspects: gas reservoir geology, drilling engineering and reservoir reconstruction. The single well control reserves of horizontal wells in volcanic gas reservoirs reach a certain scale, and the well drills a class Ⅰ reservoir and develops well . The application of new technologies such as underbalanced drilling and geosteering can improve the development effect of gas wells. The fracturing of horizontal wells can effectively improve the bottom hole seepage conditions and greatly increase the single well output. Development practice shows that horizontal wells have certain advantages for the development of volcanic gas reservoirs, and can be developed on a moderate scale using horizontal wells in blocks with good gas reservoir conditions.