裂缝性致密砂岩储层钻井液侵入深度的定量计算方法  

A quantitative calculation method of the invasion depth of drilling fluids into the fractured tight sandstone reservoirs

作　　者：范翔宇[1,2] 龚明[2] 夏宏泉[2] 王俊瑞[2] 李枝林 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室·西南石油大学,四川省成都市610500 [2]西南石油大学石油工程学院 [3]中国石油川庆钻探工程公司钻采工程技术研究院

出　　处：《天然气工业》2012年第6期60-64,110-111,共5页Natural Gas Industry

基　　金：国家科技重大专项(编号:2008ZX05000-049)研究成果之一;;西南石油大学"青年骨干教师培养计划"基金资助

摘　　要：在裂缝性致密砂岩储层中,钻井液侵入裂缝是导致储层损害的主要因素之一。然而,目前国内外对该类储层钻井液侵入深度的分析还缺乏深入探讨。为此,在分析致密砂岩裂缝发育特征及钻井液侵入对其电性特征影响的基础上,给出了钻井液侵入深度的定性分析表;进而采用体积模型法和数理统计法,建立起了不同裂缝系统的钻井液侵入深度定量计算模型。最后,精细计算了塔里木盆地中部某区9口井17个层位的裂缝性致密砂岩储层的钻井液侵入深度。结果表明,所建立的模型因很好地结合了地质、钻井、测井等客观实际(综合考虑了地层裂缝特性、岩性、电性、物性、含流体性质),计算精度较高,有效地解决了裂缝性致密砂岩储层钻井液侵入深度的定量计算问题。该成果对类似储层的污染评价、射孔设计以及开发过程中增产措施的决策都具有指导和借鉴作用。In the fractured tight sandstone reservoirs,one of the main factors causing the formation damage is the invasion of drilling fluids.However,further study and analysis has not yet been done on the invasion depth of the drilling fluids into the said type reservoirs.Based on the analysis of the characteristics of fracture development in tight sandstone reservoirs and the effects of the drilling fluid invasion on the electrical properties of the fractured tight sandstones,the qualitative analysis list of the drilling fluid invasion depth is made.Then by using the volume model method and mathematical statistics,the quantitative calculation models for drilling fluid invasion depth into different fracture systems are set up.By use of the models,the drilling fluid invasion depths of the 19 fractured tight sand formations in 9 wells of the middle Tarim Basin were precisely calculated.The results show that the models have not only combined the actual geological,drilling and logging data but taken into account the formation fracture properties,lithologies,electrical properties,physical properties,and the features of the formation fluids.With high calculation precision,these models realize the quantitative calculation of the invasion depth of drilling fluid into the fractured tight sandstone reservoirs,providing very important guidance and reference for the pollution evaluation,perforation design,and the making of stimulation strategies in the later development process.

关 键 词：致密砂岩 裂缝(地质) 钻井液 侵入深度 定性分析 定量计算 实例 

分 类 号：TE254[石油与天然气工程—油气井工程]