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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >Laboratory and field verification of a new approach to stress measurements using a dilatometer tool
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Laboratory and field verification of a new approach to stress measurements using a dilatometer tool

机译：使用膨胀仪工具进行应力测量的新方法的实验室和现场验证

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摘要

A new method is proposed for in-situ stress measurements. The stresses are estimated from the borehole pressure required to open axial fractures emanating from the borehole, similar to hydrofarcture stress measurements. However, the borehole is pressurized by inflation of a dilatometer, such as a packer and a sleeve, and the borehole pressure to reopen the fractures is detected from circumferential deformation of the borehole. The fractures are induced by hydraulic fracturing or sleeve fracturing in advance. To demonstrate this method, we developed a new dilatometer tool. The tool consists essentially of a packer around which deformation transducers sensitive to circumferential strain are affixed at 10 deg-30 deg intervals. The packer is inflated to touch the borehole wall, and then the packer pressure is increased step-wise and the resultant strains recorded. Initially, the circumferential strain developed around the borehole is radially symmetric. However, this becomes strongly asymmetric once the fractures begin to open. Thus, the records of strain at different locations around the borehole indicate both the reopening pressure and the orientation of fractures. In the case of a vertical borehole, the detected reopening pressure allows us to estimate the maximum horizontal stress on condition that the minimum horizontal stress is estimated using other approaches.
机译：提出了一种新的现场应力测量方法。类似于水文应力测量，应力是根据打开井眼产生的轴向裂缝所需的井眼压力估算的。但是，通过诸如封隔器和套筒之类的膨胀计的膨胀对钻孔加压，并且从钻孔的周向变形中检测出重新打开裂缝的钻孔压力。裂缝是预先通过水力压裂或套管压裂引起的。为了演示此方法，我们开发了一种新的膨胀仪工具。该工具主要由一个封隔器组成，在封隔器周围以10度至30度的间隔固定对周向应变敏感的变形传感器。给封隔器充气以接触井眼壁，然后逐步增加封隔器压力并记录所产生的应变。最初，围绕钻孔产生的圆周应变是径向对称的。但是，一旦骨折开始张开，这就变得非常不对称。因此，井眼周围不同位置的应变记录表明了重新张开压力和裂缝的方向。在垂直井眼的情况下，在使用其他方法估算最小水平应力的情况下，检测到的重新开启压力使我们能够估算最大水平应力。

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