LS?241.3mm松散地层取心工具的研制与应用

辽河油田沙一到馆陶含油砂层大多埋藏较浅,油层呈油砂状,有的还含有不等径砾石。常规取心工具取心时,因岩心极易冲蚀致使取心收获率大多在30%~50%之间。针对这一问题,对原有取心工具进行了认真分析,研制出新型松散地层取心工具,并在实践中获得成功,将同类地层的取心收获率提高到80%以上。对于提高辽河油田取心质量起到了重要作用。

A NOVEL CORING TOOL FOR IMPROVING CORING OPERATION IN LOOSE FORMATION

Coring in loose and unconsolidated formation is very difficult in Liaohe Oilfield, because of the drilling fluid erosion and interbeded gravel, and the core recovery is only 30%~50%. A new coring tool is designed based on the analysis of factors that influence core recovery. It applies many unique designs, e.g., larger coring diameter to improve core strength, coring barrel made of polyvinyl chloride (PVC) to reduce friction, self-locking design, special bit structure with "U" slots to reduce fluid erosion, and use of centralizing bearings, etc. It has been used in nine wells.The core recovery reaches as high as 80% in this area.