Development and Application of A Hardening Agent for Asphaltic Heavy Oil in Drilling Fluid
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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。Abstract: To decrease drilling fluid contamination caused by asphaltic heavy oil influx,a hardening agent 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 performance 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 asphalt 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,reduce the drilling fluid contamination caused by asphaltic heavy oil,and could guarantee safety drilling in asphaltic heavy oil bearing formation.
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Keywords:
- asphaltene /
- viscous crude oil /
- laboratory testing /
- hardening agent /
- field test /
- YD Oilfield
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