摘要
碳酸盐岩酸压施工中在裂缝壁面产生按一定密度排列的蚓孔,会对产能有一定影响,但是以往酸压直井产能预测模型很少考虑蚓孔的影响,且忽略了酸压裂缝和蚓孔之间的相互干扰,这和实际不相符。在前人研究的基础上,考虑酸压主裂缝上蚓孔的分布对于产能的影响,将蚓孔与人工裂缝做同样的离散化处理并根据复位势理论、势的叠加原理以及数值分析理论,建立了考虑蚓孔的直井产能预测模型。对比不考虑蚓孔和考虑蚓孔情况下的产能,同时对油藏中酸压裂缝长度、蚓孔分布密度以及蚓孔平均长度等影响产能的因素进行了模拟分析,得出其对产能的影响规律,为合理预测酸压井产能提供更科学的预测方法。
During acid fracturing of a carbonate reservoir, acid wormholes, which are generated at fracture face and arranged in certain density, can affect productivity. However, in the past,this effect was rarely considered for the productivity prediction model of acid-fracturing vertical well, and the interference between induced fracture and wormhole was neglected. Based on previous research, with the effect of wormholes distributing on major fractures on productivity considered, the discretization was carried out for both wormholes and induced fractures. And then a productivity prediction model of vertical well was established according to the complex potential theory, potential superposition principle and numerical analysis theory. The productivity considering the effect was compared with the one without this consideration. In addition, some other productivity-influencing factors including induced-fracture length, distribution density, and average length of wormhole were simulated and analyzed. Hence, the law of wormhole influencing productivity was obtained. It provides a scientific method for predicting properly the productivity of acid-fracturing wells.
出处
《天然气勘探与开发》
2015年第3期53-58,11-12,共6页
Natural Gas Exploration and Development
关键词
酸压直井
产能模拟
酸蚀蚓孔
不稳定流动
acid-fracturing vertical well,productivity simulation,acid wormhole,unsteady flow
