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火山岩天然气藏多数须压裂增产才具工业开采价值,但火山岩中的孔隙、溶孔及天然裂缝个性差异大,国内外均没有成熟的压裂工艺,增产投资高、风险大、效果差。如何准确诊断压裂难点和研究实施有针对性的处理措施,已成为火山岩气藏勘探开发取得突破的关键。在研究火山岩复杂结构对压裂G函数影响的基础上,归纳出常规滤失型、低滤失型、微裂缝发育型、微裂缝极发育型和高裂缝型5种典型G函数特征,形成了保证人造主裂缝形成工艺、处理近井复杂摩阻高工艺、压裂施工参数优化工艺、选择合适的加砂泵注程序等针对性的控制处理措施。经过在松辽盆地北部徐家围子气田超过100口井的应用,压裂成功率、施工规模及单井增产效果均取得突破,有效地提高了火山岩气藏压裂成功率和效果。
Most of volcanic gas reservoirs are subject to fracturing and stimulation to increase industrial production value. However, there are large differences in porosity, dissolved pores and natural fractures in volcanic rocks. There is no mature fracturing technology at home and abroad, with high investment, high risk and poor effect. How to accurately diagnose the fracturing difficulties and to research and implement the targeted treatment measures have become the key breakthroughs in the exploration and development of volcanic gas reservoirs. Based on the study of the influence of complex structure of volcanic rock on the fracturing G function, five typical G-function features of conventional filtration-loss type, low-loss type, microcrack development type, micro-fracture polar development type and high fracture type are summarized. To ensure that man-made main crack formation process, processing well near the complex friction resistance, fracturing construction parameters optimization process, select the appropriate sand pump injection program and other targeted control measures. After more than 100 wells in Xujiaweizi gas field in the northern part of Songliao Basin, breakthroughs were made in fracturing success rate, construction scale and stimulation effect of single well, which effectively improved the fracturing success rate and effect of volcanic gas reservoirs.