基于切削理论的数字钻探参数与岩石单轴抗压强度关系研究

来源期刊:中南大学学报(自然科学版)2021年第5期

论文作者:王琦 江贝 马凤林 刘悦 李术才 何满潮 魏华勇

文章页码:1601 - 1610

关键词:钻探参数;岩石碎屑区;碎屑压力;单轴抗压强度;随钻测试

Key words:drilling parameters; rock crushing zone; crushing pressure; uniaxial compressive strength; drilling measurement

摘    要:为实现岩石力学参数的现场实时测试,利用数字钻探技术准确获取岩石单轴抗压强度,考虑钻进过程中岩石碎屑对切削荷载的影响,建立基于岩石碎屑区的切削力学模型。基于该模型得到数字钻探参数与碎屑区边界压力(碎屑压力)的关系式,结合数字钻探试验结果建立数字钻探参数与岩石单轴抗压强度关系模型(DP-σc模型),将该模型应用于岩石单轴抗压强度的随钻测试,并验证基于DP-σc模型实时获取岩石单轴抗压强度的有效性。研究结果表明:通过随钻测试反演得到的岩石单轴抗压强度与室内单轴压缩试验结果差异率平均值小于5%,建立的DP-σc模型应用于岩石单轴抗压强度的随钻测试是合理、有效的。

Abstract: In order to realize the real-time testing of rock mechanics parameters and accurately obtain rock uniaxial compressive strength by using digital drilling technology, the cutting mechanics model based on rock crushing zone was established, considering the influence of rock crushing zone on cutting load during drilling. The relationship between digital drilling parameters and rock crushing zone boundary pressure(crushing pressure) was obtained. Combined with the digital drilling test results, the relationship model of digital drilling parameters and rock uniaxial compressive strength (DP-σc model) was obtained, which was applied to the drilling measurement of rock uniaxial compressive strength. Based on this, the validity of drilling measurement of rock uniaxial compressive strength based on DP-σc model was verified. The results show that the average difference rate of rock uniaxial compressive strength obtained by drilling test and uniaxial compression test is less than 5%. The DP-σc model is effective and reasonable when it is applied in the drilling measurement of rock uniaxial compressive strength.

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