无固相有机盐钻井液在南海西部HK29-1-2井的应用  

Application of Clay-free Organic Salt Drilling fluid in Well HK29-1-2 West of South China Sea

作　　者：程玉生[1] 杨洪烈[1] 张明[1] 胡文军[1] 卜继勇[1] 王国辉[1] 

机构地区：[1]中海油田服务股份有限公司油田化学事业部

出　　处：《钻井液与完井液》2011年第6期27-29,93,共3页Drilling Fluid & Completion Fluid

摘　　要：HK29-1-2井位于南海西部莺歌海北部,目的层为中-低孔、低-特低渗储层,具有中等偏强盐敏性、中等偏弱碱敏性,且具有明显的水锁特征。根据该区块的地层特征和储层敏感性,室内实验优选构建了无固相有机盐钻井液,现场应用表明,该钻井液具有较好的防水锁效应;体系滤液活度远远低于地层水,不容易侵入地层;抑制性好,避免水敏现象的发生;无固相,防止了固相对于储层的伤害;体系通过降低滤液活度协同膜效应的方式,阻止二价金属离子进入储层生成沉淀堵塞孔喉;抗温性好,可达150℃,调整后抗温性能可提高至180℃;机械钻速与邻井相比大幅度提高。The characteristics of target zones of well HK29-1-2 are medium-low porosity and low-ultra low permeability,medium strong salt sensitivity and medium weak alkali sensitivity,and water block apparently.The clay-free organic salt drilling fluid is developed based on the formations,and the experimental results show that it has high performance of inhibition because the filtrate activity of filtrate is much lower than the formation water,which can protect reservoirs from water block and deposit block that made by bivalent metallic ion,and the high temperature resistance is increased from 150 ℃ to 180 ℃.The ROP is enhanced sharply compared with the offset wells.

关 键 词：无固相有机盐钻井液 低渗储集层 防止地层损害 水锁 南海西部 

分 类 号：TE254.3[石油与天然气工程—油气井工程]