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首页> 外文期刊>Zeitschrift der Deutschen Gesellschaft fur Geowissenschaften: ZDGG >Geomechanical behaviour of pelitic rocks with diagenetically caused different strengths becoming effective in deep geothermal boreholes
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Geomechanical behaviour of pelitic rocks with diagenetically caused different strengths becoming effective in deep geothermal boreholes

机译：庞特岩石与成岩岩石岩石的地质力学行为在深层地热钻孔中变得有效

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摘要

A different state of strength due to the diagenetic consolidation in pelitic rocks (mudstone, brittle shales, schists) causes problems with borehole stability during the drilling process of deep holes. Breakouts of the wall take place as well as convergence of the diameter of the borehole. Based on several projects of deep geothermal boreholes in the Upper Rhine region the interaction between the regional stress field, the strength and deformability of the fine-grained rocks and the varying conditions due to the drilling operations was investigated. The regional stress field directly influences the loading capacity around the borehole. The anisotropy of the regional stress field is of similar importance for the borehole stability as the effects of the pore fluid pressure conditions in the rock formation, because these change during the drilling operations in a complex manner, and therefore they change the strength and deformability of the pelitic rocks at the wall of the borehole. These interactions between pore fluid pressure and geomechanical rock behaviour in relation to drilling operational experiences were systematically tested by triaxial tests in the lab. These can be used as basic results for a first approach to a drilling conception, which may avoid expensive operations due to borehole instabilities.
机译：由于鹈鹕岩石（泥岩，脆性Shales，Schists）中的成岩固结导致的不同的强度状态导致深孔钻井过程中钻孔稳定性的问题。墙壁的突破发生以及钻孔直径的收敛。基于上莱茵河地区深层地热钻孔的几个项目，研究了区域应力场与细粒岩石的强度和可变形性与钻孔操作引起的不同条件之间的相互作用。区域应力场直接影响钻孔周围的负载能力。区域应力场的各向异性对于钻孔稳定性与岩石形成中的孔隙流体压力条件的影响相似，因为这些变化在钻孔操作中以复杂的方式，因此它们改变了强度和可变形性骨灰岩石在钻孔的墙壁上。通过实验室的三轴试验系统地测试了孔隙流体压力和地质力学岩石行为之间的这些相互作用。这些可以用作钻孔概念的第一种方法的基本结果，这可能避免由于钻孔不稳定性导致的昂贵的操作。

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