Development of a New Diagnostic Method for LostCirculation in Directional Wells
作者机构：Craft & Hawkins Department of Petroleum Engineering Louisiana State University Baton Rouge LA 70803 USA University of Tulsa 800South Tucker Drive Tulsa OK 74104 USA YU Technologies Inc. 7633 E63rd Place Tulsa OK 74133 USA
出 版 物：《Journal of Energy and Power Engineering》 (能源与动力工程（美国大卫英文）)
年 卷 期：2016年第10卷第12期
页 面：751-764页
学科分类：08[工学] 0807[工学-动力工程及工程热物理]
主 题：Lost circulation, thermal modeling, drilling microchip, locating loss zone.
摘 要：Failure to manage and minimize lost circulation can greatly increase the cost of drilling and the risk of well *** lost circulation remedial procedures are not working as planned because the locations of loss zones are incorrectly *** lack of this critical piece of information prevents treatments from being applied directly to the points of losses and, thus,resulting in low efficiency and extended NPT （non-productive time）. This paper presents an integrated method for identifying thelocations of loss zones with continuous temperature measurement data enabled by drilling microchip technology. A transient thermalmodel in predicting the temperature profiles in the wellbore and formation during mud loss is developed as a forward calculationprocedure of the loss zone mapping method. For a deep well with moderate to severe loss, there are significant changes in the mudcirculating temperature profiles as mud loss persists. Certain characteristics ofwellbore thermal behavior are evaluated and identifiedas good indicators of loss zones. Case studies are conducted to demonstrate the practical applications of the method in both onshoreand offshore drilling applications. The results from these case studies are important in setting cement plugs, applying expandabletubular systems, and spotting LCM （lost circulation material） pills. Additional uses of this method include identifying highlypermeable zones for reservoir or formation evaluation purposes. This method can be used as a routine monitoring process performedregularly without any interference of the drilling operations at the time.
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