抗高温高密度饱和盐水钻井液在川西地区的应用  

APPLICATION OF HIGH-TEMPERATURE HIGHDENSITY SATURATED-BRINE DRILLING FLUID SYSTEM AT WEST SICHUAN

作　　者：罗宇峰[1] 

机构地区：[1]川庆钻探工程有限公司钻井液技术服务公司

出　　处：《钻采工艺》2017年第5期98-101,共4页Drilling & Production Technology

摘　　要：随着油气勘探向着深部地层发展,钻井液面临严峻挑战,尤其是在高温、高密度、饱和盐环境下,钻井液极易发生流变性与失水造壁性失控。国内外对同时具备抗高温、高密度、饱和盐三者同存条件下的钻井液体系研究成果较少。文章通过大量基础研究,在钻井液中引入了抗温抗盐降滤失剂、高温稳定剂、除氧剂,采用激光粒度分析仪和扫描电镜优选刚性填充粒子和柔性填充粒子,最终形成了一套具有较好综合性能的抗高温高密度饱和盐钻井液体系。该钻井液体系在川西邓井关构造DT1井进行了现场应用,成功解决了国内首例井底高温(200℃)、钻井液高密度(2.22 g/cm^3)、饱和盐(210 000 mg/L)污染三者共存的特殊地质情况井的钻进作业,证明了该钻井液体系能够很好的解决高温、高密度、饱和盐环境下钻井液流变性、抑制性和失水造壁性的技术难题。With the petroleum exploration going to the deeper formations,the drilling fluid technology is facing severe challenges, especially in high-temperature, high-density and saturated brine environment. The rheology and the wall-building performance of the drilling fluid is prone to out of control. At present,few research achievements have been obtained in development of drilling fluid systems for applications combining high temperature,high density and saturated brine. Through a large number of basic studies,high-temperature salt-tolerant filtration reducer,high-temperature stabilizing agent,and oxygen-removing agent were introduced into the drilling fluid system. By laser particle size analyzer and SEM the optimum rigid and flexible particles were chosen. Eventually a drilling fluid system with supreme comprehensive performance for high temperature,high density and saturated brine conditions was developed. It has been applied in Well DT1 at Dengjingguan structure in West Sichuan,successfully drilled the well under special geologic conditions of high temperature( 200℃),high density( 2. 22g/cm^3) requirement,and saturated brine( 210000mg/L) together,proving it has solved the problems regards rheology,inhibition and wall-building performance of the drilling fluid system under those conditions.

关 键 词：高温 高密度 饱和盐 邓井关 

分 类 号：TE254[石油与天然气工程—油气井工程]