| 摘要: |
| 针对石油钻井地层岩石研磨性试验评价问题,根据金刚石钻头的磨损机制,改装试验装置,研制标准磨损件,优选试验规程,提出以标准磨损件研磨破碎单位体积岩石的磨损体积作为岩石研磨性指标,建立一套岩石研磨性测定方法。试验测定石油钻井地层代表性岩石的研磨性指标。通过研磨性试验,优选出标准磨损件的金刚石体积分数为25％,粒度为0.3 mm,胎体配方为酚醛树脂55％、Cu 25％、Cr2O3 8％、ZnO 6％、SiC 5％、空隙1％(体积分数)。优选出的试验钻压为500 N,转速为198 r/min,排量为0.2 L/s。试验中代表性岩石的研磨性指标数值为0.80～45.78,取以2为底的对数值作为研磨性级值,将中国石油钻井地层岩石的研磨性分为6级。 |
| 关键词: 金刚石钻头 岩石研磨性 测定方法 标准磨损件 研磨性指标 研磨性分级 |
| DOI：10.3969/j.issn.1673-5005.2016.04.009 |
| 分类号::TE 921.1 |
| 文献标识码:A |
| 基金项目:教育部博士点基金项目(20100133110002) |
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| A modified determination method of rock 's abrasiveness for well drilling using diamond bits |
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ZOU Deyong1, YUAN Jun1, XING Chen1, MENG Xiangyu1,2, LIU Xiaoao1
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(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.CNOOC Energy Technology-Safety & Environmental Protection Company, Tianjin 300456, China)
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| Abstract: |
| In order to classify the rock 's abrasiveness in oil well drilling using diamond or PDC bits, a conventional equipment used for rock 's abrasiveness testing was modified based on the wear mechanisms of diamond bits, and a new kind of standard wear specimen made of diamond bit materials was manufactured. The volume worn of the standard wear specimen for breaking per unit volume of rocks was taken as the abrasiveness index, and a new experimental method was proposed. An optimized diamond volume fraction of the standard wear specimen was determined as 25% with size of 0.3 mm diamond grains, and the matrix was formulated with phenolic resin 55%, Cu 25%, Cr2O3 38%, ZnO 6%, SiC 5% and with 1% volume of pores. For the standard wear testing, the suggested weight on the wear specimen is of 500 N, and the rotation speed is 198 r/min with a circulation rate of drilling fluid of 0.2 L/s. The abrasiveness index of the representative rock samples from different formations encountered in oil well drilling has been determined, which was found to be in the range of 0.80 to 45.78. The logarithm value of the abrasiveness index was used for the classification of the rock 's abrasiveness, defined as the abrasiveness grade value. The rocks encountered in oil well drilling in China can be divided into six grades according to the abrasiveness grade values. |
| Key words: diamond bit rock abrasiveness determination method standard wear specimen abrasiveness index abrasiveness classification |
