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首页> 美国政府科技报告 >Significance of Drilling- and Coring-Induced Fractures in Mesaverde Core, Northwestern Colorado.
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Significance of Drilling- and Coring-Induced Fractures in Mesaverde Core, Northwestern Colorado.

机译：科罗拉多西北部mesaverde岩心中钻井和取心诱导裂缝的意义。

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Several types of mechanically induced fractures occur in Mesaverde core form the US Department of Energy's Multiwell Experiment wells. Two types of fractures have significance to the determination of in situ stresses. (1) Scribe-line fractures originate at orientation grooves on the surface of the core and are initiated by scribing knives in the core barrel minutes after the core is cut free from the surrounding rock. In sandstone, they strike parallel to the maximum in situ horizontal stress direction that has been determined in these wells by anelastic strain recovery measurements. (2) Drilling- or coring-induced petal and petal-centerline fractures form just below the advancing core bit. Their strike is controlled primarily by the in situ stress, but locally may be influenced by shear stress created by bit rotation. Large shear stress may reorient petal fracture strikes in the direction of bit rotation, oblique to the maximum in situ horizontal stress direction. In most situations, however, orientations of these two types of fractures may be used to determine the orientation of the in situ stresses relative to natural fractures, and ultimately whether a stimulation fracture will parallel or intersect natural fracture permeability systems in a reservoir. 15 refs., 17 figs. (ERA citation 13:041630)

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