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Journal ArticleDOI

Induced Stress and Interaction of Fractures During Hydraulic Fracturing in Shale Formation

01 Nov 2015-Journal of Energy Resources Technology-transactions of The Asme (American Society of Mechanical Engineers)-Vol. 137, Iss: 6, pp 062902
About: This article is published in Journal of Energy Resources Technology-transactions of The Asme.The article was published on 2015-11-01. It has received 29 citations till now. The article focuses on the topics: Hydraulic fracturing & Oil shale.
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Journal ArticleDOI
TL;DR: In this paper, a comprehensive numerical model is developed to study the fracture propagation direction during volume fracturing of unconventional reservoirs, based on elastic and fracturing mechanics of a rock, as well as the maximum circumferential stress criterion and boundary element method.

64 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed a mathematical model to estimate the stimulated reservoir volume (SRV) through simulating the main process during shale fracturing, where multiple simultaneous hydraulic fractures propagate, perturbing the formation stress and raising the reservoir pressure; meanwhile, the stress change and pressure rise may jointly make natural fractures occur failure, and the SRV is estimated based on the volume of the naturally fractured zone that experiences tensile or shear failure.

52 citations

Journal ArticleDOI
TL;DR: In this paper, an accurate and robust correlation for static Young's modulus to be estimated directly from log data without the need for core measurements was developed, which was tested for different cases with different lithology such as calcite, dolomite and sandstone.
Abstract: The estimation of the in situ stresses is very crucial in oil and gas industry applications. Prior knowledge of the in situ stresses is essential in the design of hydraulic fracturing operations in conventional and unconventional reservoirs. The fracture propagation and fracture mapping are strong functions of the values and directions of the in situ stresses. Other applications such as drilling require the knowledge of the in situ stresses to avoid the wellbore instability problems. The estimation of the in situ stresses requires the knowledge of the Static Young’s modulus of the rock. Young’s modulus can be determined using expensive techniques by measuring the Young’s modulus on actual cores in the laboratory. The laboratory values are then used to correlate the dynamic values derived from the logs. Several correlations were introduced in the literature, but those correlations were very specific and when applied to different cases they gave very high errors and were limited to relating the dynamic Young’ modulus with the log data. The objective of this paper is to develop an accurate and robust correlation for static Young’s modulus to be estimated directly from log data without the need for core measurements. Multiple regression analysis was performed on actual core and log data using 600 data points to develop the new correlations. The static Young’s modulus was found to be a strong function on three log parameters, namely compressional transit time, shear transit time, and bulk density. The new correlation was tested for different cases with different lithology such as calcite, dolomite, and sandstone. It gave good match to the measured data in the laboratory which indicates the accuracy and robustness of this correlation. In addition, it outperformed all correlations from the literature in predicting the static Young’s modulus. It will also help in saving time as well as cost because only the available log data are used in the prediction.

46 citations


Cites background from "Induced Stress and Interaction of F..."

  • ...Zhou et al. (2015) studied the interaction between the hydraulic fractures in shale formations numerically....

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References
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Journal ArticleDOI
TL;DR: In this paper, the distribution of stress produced in the interior of an elastic solid by the opening of an internal crack under the action of pressure applied to its surface is considered, and the conditions for rupture are deduced.
Abstract: The distribution of stress produced in the interior of an elastic solid by the opening of an internal crack under the action of pressure applied to its surface is considered. The analysis is given for 'Griffith' cracks (section 2) and for circular cracks (section 3), it being assumed in the latter case that the applied pressure varies over the surface of the crack. For both types of crack the case in which the pressure is constant over the entire crack surface is considered in some detail, the stress components being tabulated and the distribution of stress shown graphically. The effect of a crack (of either type) on the stress produced in an elastic body by a uniform tensile stress is considered and the conditions for rupture deduced.

1,097 citations