摘要
为了解决沥青质稠油对钻井液的污染问题,从沥青氧化硬化化学反应理论出发,对13种沥青处理剂进行了沥青质稠油硬化试验,优选出硬化剂LYJ-5;并在钻井液中进行了硬化试验,对硬化剂与稠油反应时产生的温度、压力进行了室内试验评估;然后,对沥青质稠油硬化剂进行了现场试验验证。室内试验表明,LYJ-5可以使沥青质稠油的软化点由52℃提高至127℃;在有、无钻井液存在2种情况下,LYJ-5可以将稠油沥青的软化点提高52℃和75℃。在F17井的现场试验表明,应用LYJ-5之后每小时钻井液污染量降低至应用前的19.15%,部分沥青出现硬化聚集现象,使后续的测井和下套管施工更加顺利。综合研究表明,LYJ-5可以大幅度提高沥青质稠油的软化点,显著降低沥青质稠油对钻井液的污染,因而可对沥青层钻进提供强有力的技术支持。
To decrease drilling fluid contamination caused by asphaltic heavy oil influx ,a hardening a-gent LYJ 5 was developed based on the chemical theory that asphalt get harder after oxidation .Solidifying test was conducted in drilling fluid environment ,the effect of temperature and pressure on solidifying per-formance was evaluated ,then the selected hardening agent was applied in oilfield .LYJ 5 could increase the softening point of asphalt from 52 ℃ to 127 ℃ and the softening point temperature was raised by 52 ℃ in drill fluid and 75 ℃ without drilling fluid respectively .Its application in Well F17 showed the contaminated drilling fluid volume per hour decreased by 19.15% after adding LYJ 5 ,solidifying and accumulation of as-phalt was observed at outlet ,making wire line logging and casing running smooth .It was concluded from comprehensive study that LYJ 5 could increase the softening point of asphaltic heavy oil significantly ,re-duce the drilling fluid contamination caused by asphaltic heavy oil ,and could guarantee safety drilling in as-phaltic heavy oil bearing formation .
出处
《石油钻探技术》
CAS
CSCD
北大核心
2014年第1期50-54,共5页
Petroleum Drilling Techniques
基金
国家科技重大专项"中东富油气区复杂地层井筒关键技术"(编号:2011ZX05031-004)
中国石化科技攻关项目"海外重点区块复杂地层钻完井关键技术研究"(编号:P12077)部分成果
关键词
沥青质
稠油
实验室试验
硬化剂
现场试验
YD油田
asphaltene
viscous crude oil
laboratory testing
hardening agent
field test
YD Oilfield
