裂缝性和基质性碳酸盐岩在堵漏前后的应力敏感性研究  

The Study of Stress Sensitivity for Fractured and Matrix Carbonate Rocks before and after Sealing

作　　者：杨沛[1] 陈勉[1] 侯冰[1] 金衍[1] 刘晓民[2] 张伟[1] 

机构地区：[1]石油工程教育部重点实验室(中国石油大学),北京102249 [2]中国石化西北油田分公司工程技术研究院,新疆乌鲁木齐830011

出　　处：《石油钻探技术》2011年第6期31-34,共4页Petroleum Drilling Techniques

基　　金：教育部新世纪优秀人才支持计划项目"气体钻井气液介质转换过程中的井壁失稳机理与对策研究"(编号:NCET-08-0840)资助

摘　　要：塔中奥陶系碳酸盐岩储层裂缝和孔隙发育,钻进过程中极易发生漏失,当采用堵漏浆进行封堵时,堵漏材料会充填裂缝和孔隙,此时不同类型碳酸盐岩的渗透率会产生不同的变化。通过试验,对比研究了裂缝性和基质性碳酸盐岩在堵漏浆浸泡处理前后的应力敏感性,同时对比分析了二者的渗透率恢复率与有效应力的关系,并从作用机理上探讨了二者应力敏感行为的差异性。研究表明,裂缝性碳酸盐岩在堵漏浆处理前后的应力敏感性都要远高于基质性碳酸盐岩。堵漏材料对孔隙和裂缝空间造成影响程度的不同,是二者渗透率随有效应力加载和卸载过程中产生明显差异的主要原因。Fluid loss can easily occur in fracture and matrix in Tazhong Ordovician carbonate reservoir.When using plugging slurry for sealing,lost circulation material will fill fractures and matrix,the permeability of different carbonate reservoir changed differently.The stress sensitivity of fracture and matrix carbonate rock before and after plugging slurry soaking were investigated by experiments.The relationship between the permeability recovery ratio and effective stress was analyzed.The difference in stress-sensitive behavior of these two was discussed.Studies have shown that the stress sensitivity of fractured carbonate rocks is higher than that of matrix carbonate rocks.The different degree of impact of plugging material on fracture and matrix is the main reason for the obvious difference of permeability during loading and unloading.

关 键 词：碳酸盐岩 堵漏 裂缝 孔隙 渗透率 应力敏感性 

分 类 号：TE28[石油与天然气工程—油气井工程]