油基钻井液对超深裂缝性致密砂岩气藏的保护能力评价  

Damage evaluation on oil-based drill-in fluids for ultra-deep fractured tight sandstone gas reservoirs

作　　者：朱金智[1] 游利军[2] 李家学[1] 康毅力[2] 张俊杰[1] 张杜杰[2] 黄超[1] 

机构地区：[1]中国石油塔里木油田公司 [2]"油气藏地质及开发工程"国家重点实验室.西南石油大学

出　　处：《天然气工业》2017年第2期62-68,共7页Natural Gas Industry

基　　金：国家自然科学基金项目"富有机质页岩氧化致裂增渗加速气体传输机理研究"(编号:51674209);国家自然科学基金项目"基于逾渗和固液两相流理论的裂缝性储层工作液漏失损害预测与控制"(编号:51604236)

摘　　要：以塔里木盆地山前白垩系巴什基奇克组某超深、裂缝性致密砂岩气藏为研究对象,探究油基钻井液对其储层的损害机理,以便于完善油基钻井液储层保护能力评价方法和优选原则。为此开展了钻井液滤液损害、钻井液体系动态损害以及滤饼承压能力室内实验,完善了该钻井液储层保护能力的室内评价方法。首先进行固相粒度分析前进行钻井液预处理,然后模拟动态损害过程评价钻井液返排渗透率恢复率,最后开展滤饼承压能力评价。实验结果表明:1主要的储层损害方式为固相侵入、液相圈闭损害;2油基钻井液滤液对基块损害程度为强;3钻井液体系对裂缝动态损害程度达到中等偏强—强,钻井液滤饼仅对100μm及以下缝宽裂缝具有封堵能力。结论认为,应用油基钻井液保护该类储层应优先保证油基钻井液滤饼承压能力,同时兼顾动态损害渗透率恢复率和液相圈闭损害程度。In order to explore the damage mechanisms and improve the method to evaluate and optimize me periormance oi iormauon damage control of oil-based drill-in fluids, this paper took an ultra-deep fractured tight gas reservoir in piedmont configuration, located in the Cretaceous Bashijiqike Fm of the Tarim Basin, as an example. First, evaluation experiments were conducted on the filtrate inva- sion, the dynamic damage of oil-based drill-in fluids and the loading capacity of filter cakes. Meanwhile, the evaluating methods were optimized for the formation damage control effect of oil-based drill-in fluids in laboratory： pre-processing drill-in fluids before grading analysis; using the dynamic damage method to simulate the damage process for evaluating the percentage of regained permeability; and evaluating the loading capacity of filter cakes. The experimental results show that （1） oil phase trapping damage and solid phase invasion are the main formation damage types; （2） the damage degree of filtrate is the strongest on the matrix; and （3） the dynamic damage degree of oil-based drill-in fluids reaches medium strong to strong on fractures and filter cakes show a good sealing capacity for the fractures less than 100μm. In conclusion, the filter cakes＇ loading capacity should be first guaranteed, and both percentage of regained permeabil- ity and liquid trapping damage degree should be both considered in the oil-based drill-in fluids prepared for those ultra-deep fractured tight sandstone gas reservoirs.

关 键 词：超深 裂缝性 致密砂岩气藏 油基钻井液 漏失 承压能力 储层损害 评价方法 塔里木盆地 白垩纪 

分 类 号：TE254[石油与天然气工程—油气井工程]