摘要
酸液在酸压裂缝内流动时 ,有少数较大的岩石孔隙或天然裂缝首先受到过量酸液的溶蚀而迅速增长形成蚓孔 ,使滤失主要在蚓孔内发生。因此研究天然裂缝性油藏酸液滤失 ,必须考虑酸蚀蚓孔的影响。基于裂缝性油藏酸压中酸液的流动反应特性 ,建立了酸蚀蚓孔的增长模型、酸液在蚓孔内流动反应模型和滤失的酸液在地层中流动模型 ,提出了便于现场应用的裂缝性油藏酸压滤失计算方法 ;就影响蚓孔增长及滤失的裂缝净压力、蚓孔密度和酸液粘度等因素进行了实例计算分析 。
When acid fluids flow in artificial fractures, some larger pores or natural fractures are dissolved by acid to enlarge into wormholes so that acid mainly leaks through wormholes. Therefore, it must be considered the effects of acidizing wormholes on acid leak-off in naturally-fractured reservoirs. Based on the characteristics of acid flowing in naturally-fractured reservoirs, the model of acidizing wormhole growth, the model of acid flowing and reaction in wormholes and the model of acid flowing in the matrix are developed. The computing method of acid leak-off with the effects of acidizing wormholes is put forward. The effects of net fracture pressure, wormhole population and acid viscosity to wormhole growth and acid leak-off are studied by case calculation that has important meanings for controlling the leak-off of acid fracturing
出处
《西南石油学院学报》
CSCD
2004年第2期50-53,共4页
Journal of Southwest Petroleum Institute
基金
四川省天然气开采重点实验室项目 (省室基金 0 15 )
关键词
天然裂缝
裂缝性油藏
酸压
蚓孔
滤失
数学模型
natural fracture
naturally-fractured reservoirs
acid fracturing
wormhole
leak-off
mathematical model
