CAJ | 학술논문

水平井结合水力压裂技术已经成为高效开发页岩气藏的有效手段。为此，建立并求解了综合考虑页岩气解吸、扩散和渗流特征的页岩气藏压裂水平井五区复合渗流模型，获得了Laplace空间的产量解析解。运用Stehfest数值反演技术得到了实空间的无因次产量，绘制并分析了无因次产能递减曲线。研究结果表明：产能递减曲线可划分为6个流动阶段；窜流系数主要影响解吸扩散及以后的流动阶段；导流能力主要影响早期裂缝线性流动阶段；压裂区宽度越大，产能越大；压裂区渗透率主要对中后期的产能曲线产生影响，渗透率越大，压裂之后形成的缝网与天然微裂缝沟通的越好，产能越大。研究结果可为页岩气藏分段压裂水平井产能递减分析提供科学依据。
수평정결합수력압렬기술이경성위고효개발혈암기장적유효수단。위차，건립병구해료종합고필혈암기해흡、확산화삼류특정적혈암기장압렬수평정오구복합삼류모형，획득료Laplace공간적산량해석해。운용Stehfest수치반연기술득도료실공간적무인차산량，회제병분석료무인차산능체감곡선。연구결과표명：산능체감곡선가화분위6개류동계단；찬류계수주요영향해흡확산급이후적류동계단；도류능력주요영향조기렬봉선성류동계단；압렬구관도월대，산능월대；압렬구삼투솔주요대중후기적산능곡선산생영향，삼투솔월대，압렬지후형성적봉망여천연미렬봉구통적월호，산능월대。연구결과가위혈암기장분단압렬수평정산능체감분석제공과학의거。
Horizontal wells with hydraulic fracturing technology have become an efficient way to produce from shale gas reservoir. Therefore,a composite mathematical model of five regions for fractured horizontal wells in shale gas reservoirs is established in this paper with consideration of desorption,diffusion and percolation characteristics. Then the analytical solution is deduced in Laplace space. Based on the Stehfest numerical inversion algorithms,the analytical solution of dimensionless production in real space is obtained,and dimensional production decline curve is plotted and analyzed. The results show that decline curve can be divided into six different flow regimes according to the characteristics;interporosity flow coefficient mainly influences the shape of desorption and later stages;hydraulic fracture conductivity mainly influences the shape of early linear flow stage,permeability of the stimulated region mainly influences the shape of mid-to late stage. The greater the width of stimulated region is,the higher the production is,and the greater the permeability is,the higher the production is,because the fracture network after being hydraulic fractured is connected well with natural fractures. The results obtained can provide scientific basis for reasonable analysis to production analysis for fractured horizontal wells in shale gas reservoirs.