模拟地层条件的岩石抗钻特性  

Study on anti-drilling performance of rock under simulated formation conditions

作　　者：沈海超[1] 刘畅[1] 王建宁[1] 郑力[1] 田院生 万州亮[1] 

机构地区：[1]中国石化集团国际石油勘探开发有限公司,北京100029

出　　处：《西安石油大学学报（自然科学版）》2015年第6期22-25,32,共5页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中石化国际石油勘探开发有限公司科研项目"亚北极海域维宁区块优快钻井配套研究"(编号:VENI073-2009)

摘　　要：可钻性级值及单轴抗压强度不能全面、客观分析地层条件下岩石抗钻特性,而利用三轴抗压强度指导钻头选型及钻速预测又受到缺乏连续地层强度特性剖面的制约。针对这一问题,基于模拟地层条件的三轴抗压强度实验、波速实验及微钻头可钻性实验,通过多元回归分析,分别建立了三轴抗压强度、可钻性级值多因素关系模型。在此基础上,利用测井资料建立了抗钻特性参数连续剖面,揭示了抗压强度分层规律。俄罗斯远东鄂霍次克海域V区块实例研究表明:以三轴抗压强度为基础的PDC钻头优化设计取得了钻井提速显著、钻头寿命明显延长的综合效果。To use drillability grade value and uniaxial compressive strength( UCS) cannot completely and objectively evaluate the anti-drilling performance of rock,and meanwhile to use triaxial compressive strength( TCS) for guiding the type selection of bit and the prediction of drilling rate is restricted by the lack of continuous profile of TCS. For this reason,the relationship models of TCS and drillability grade value are constructed by multiple regression method respectively on the basis of triaxial compression tests,acoustic velocity tests and micro-bit tests under simulated formation conditions. Then the profiles of TCS and drillability grade value are respectively established and classified by geologic horizon. The case of Block V in the Russian Far East Okhotsk Sea Area shows that the bits designed and selected by TCS greatly improve drilling rate and obviously prolong the lifetime of the bits.

关 键 词：岩石抗钻特性 地层条件 三轴抗压强度 可钻性 钻头设计及选型 

分 类 号：TE21[石油与天然气工程—油气井工程]