缝洞型碳酸盐岩储层漏失模型及控制对策  

Lost Circulation Models and Mud Loss Control Measures in Fractured and Cavernous Carbonate Reservoirs

作　　者：闫丰明[1] 康毅力[2] 孙凯[1] 杜春朝[3] 

机构地区：[1]中原石油勘探局钻井一公司 [2]油气藏地质及开发工程国家重点实验室.西南石油大学 [3]中国石化西北油田分公司

出　　处：《钻井液与完井液》2012年第3期78-80,97-98,共3页Drilling Fluid & Completion Fluid

基　　金：973计划课题"深井复杂储层漏失与井壁失稳机理及预测"(2010CB226705);国家科技重大专项:复杂地层漏失诊断及完井方法研究(2011ZX05005-006-008HZ);碳酸盐岩缝洞型储层保护技术配套(2008ZX05049-03-07HZ)

摘　　要：缝洞型碳酸盐岩储层工程地质条件复杂,缝洞发育,漏失极易发生且漏失损害严重,以塔河油田12区为例,该区块奥陶系已完钻的95口井中47%的井发生漏失,30%发生不同程度放空,漏失通道形态及组合方式是漏失模型及漏失控制对策的依据,建立了(闭合)缝-洞-缝-洞、(开启)缝-洞-缝-洞、洞-缝-洞-缝3种抽象化储层漏失模型,分析认为,溶洞的大小、离井壁的远近程度决定了漏失控制的难易程度,只有在漏失通道的狭窄处实施封堵,才能有效地控制缝洞型储层的漏失问题。研究表明,缝洞型储层的难点在于不能准确地预测储层的漏失通道尺寸及存在方式、位置、形态、大小等特征,关键在于又快又好地封堵裂缝;针对不同类型的缝洞型储层漏失,系统给出了不同类型储层的相应漏失控制对策。Geological engineering situation is complicated in fractured and cavernous carbonate reservoirs, which has highrisk of lost circulation.For example, in No.12 block of Tahe oilfield, each of the lost circulation and traveling empty happensin 47% and 30% wells of total 95 wells.Lost circulation model and mud loss control measures depend on the shape andcombination mode of loss channels, and the fracture-cavity-fracture-cavity (closed), fracture-cavity-fracture-cavity (open),cavity-fracture-cavity mud loss models are established.The analyzing results show that mud loss control, whether easy ornot, depends on the size of cavities and the distance to the borehole, and the most effective measures of sealing is to seal the narrowest section of loss channels.The researches show that the difficulties of loss control in fractured and cavernousreservoirs lies in that the size, location and shape of loss channels can not be forecasted accurately, and the key to control mudloss is sealing fractures as fast as possible.Aiming at different types of fractured and cavernous reservoirs lost circulations,corresponding mud loss control measures are developed separately.

关 键 词：缝洞型储层 溶洞 漏失通道 漏失模型 控制对策 

分 类 号：TE282[石油与天然气工程—油气井工程]