Coring Challenges and Solutions in the YD Oilfield
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摘要: YD油田早期探井的岩心资料不全,且岩心收获率偏低.为补全岩心资料,提高该油田的岩心收获率,针对该油田取心井段地层溶洞发育、易破碎,地层岩性非均质强,软硬地层交错且高含H2S等特点,在分析该油田钻井取心技术难点的基础上,结合该油田的钻井取心实践,从取心工具的选择、井眼准备、下钻、取心参数的优化、割心及起钻等方面,提出了提高YD油田岩心收获率的技术对策,并在YD油田APP3井和F09井钻井取心时进行了现场试验,2口井的岩心收获率得到大幅提高.这表明,该取心技术对策可以解决YD油田钻井取心存在的技术难点.Abstract: In the YD Oilfield, early wildcat wells provided only limited core data and there was low core recovery. In order to acquire enough core data and to improve the core recovery in this oilfield, coring challenges were first analyzed, since the coring intervals were prone to break due to existence of dissolved caves and the fact they contained alternating hard and soft formations with high heterogeneity and high H2S. Then, considering these challenges and the practice of coring in this oilfield, a specific coring solution was proposed for the YD Oilfield, that included consideration of aspects of coring tools selection, wellbore preparation, runing in hole, coring parameters optimization, core cutting and pulling out of hole. In addition, this article also demonstrates the coring drilling experiences in Well APP3 and F09. The solution was applied in Wells APP3 and F09,and their core recovery rate in these wells significantly improved. The results indicate that the proposed solution could effectively address the challenges of coring in this oilfield.
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Keywords:
- coring /
- core recovery rate /
- coring tools /
- YD Oilfield
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