Hydraulic fracture vertical propagation behavior in transversely isotropic layered shale formation with transition zone using XFEM-based CZM method

2021 ◽  
Vol 248 ◽  
pp. 107707
Author(s):  
Peng Tan ◽  
Yan Jin ◽  
Huiwen Pang
Keyword(s):  
Transition Zone ◽  
Hydraulic Fracture ◽  
Transversely Isotropic ◽  
Propagation Behavior ◽  
Vertical Propagation ◽  
Shale Formation

Analysis of hydraulic fracture initiation and vertical propagation behavior in laminated shale formation

Fuel ◽  
2017 ◽  
Vol 206 ◽  
pp. 482-493 ◽  
Author(s):  
Peng Tan ◽  
Yan Jin ◽  
Ke Han ◽  
Bing Hou ◽  
Mian Chen ◽  
...  
Keyword(s):  
Hydraulic Fracture ◽  
Fracture Initiation ◽  
Propagation Behavior ◽  
Vertical Propagation ◽  
Shale Formation

Observing the effects of transition zone properties on fracture vertical propagation behavior for coal measure strata

2019 ◽  
Vol 126 ◽  
pp. 69-82
Author(s):  
Liming Wan ◽  
Bing Hou ◽  
Peng Tan ◽  
Zhi Chang ◽  
Yeerfulati Muhadasi
Keyword(s):  
Transition Zone ◽  
Coal Measure ◽  
Propagation Behavior ◽  
Vertical Propagation

Research on hydraulic fracture initiation and vertical propagation behavior in laminated tight formation

2020 ◽  
Author(s):  
anan wu
Keyword(s):  
Hydraulic Fracture ◽  
Vertical Plane ◽  
Fracture Initiation ◽  
Bedding Plane ◽  
Vertical Stress ◽  
Hydraulic Fractures ◽  
Research Knowledge ◽  
Propagation Behavior ◽  
Vertical Propagation ◽  
Tight Formation

<p>Research on hydraulic fracture initiation and vertical propagation</p><p>behavior in laminated tight formation</p><p>Anan Wu<sup>1</sup>, Bing Hou<sup>*1</sup>, Fei Gao<sup>2</sup>，Yifan Dai<sup>1</sup>，Mian Chen<sup>1</sup></p><ul><li>(1. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum-Beijing, Beijing, China No.1 Cementing Company, Bohai Drilling Engineering Company Limited, CNPC, China. Renqiu,062550)</li> </ul><p> </p><p><strong>Abstract: </strong>The extent of hydraulic fracture vertical propagation extent is important in evaluating simulated reservoir volume for laminated tight reservoirs. Given that it is affected by the discontinuities (beddings, natural fractures, and other factors), fracture geometry is complex in the vertical plane and is different from a simple fracture in a homogeneous formation. Because the tight formation bedding is very developed, hydraulic fracture is difficult to spread vertically. Now,the propagation mechanism of hydraulic fracture in the vertical plane has not been well understood. To clarify this mechanism, several groups of large-scale tri-axial tests were deployed in this study to investigate the fracture initiation and vertical propagation behavior in laminated tight formation. The influences of multiple factors on fracture vertical propagation were studied.</p><p>we carried out the indoor hadraulic fracturing physical simulation experiments of the bedding-developed rocks. Tight cores obtained from the core well were wrapped with cement into 30 cm cubes, and samples were drilled and cemented. Before the experiment ,three-dimensional axial stress was applied to simulate the stratigraphic environment. When the stress was balanced, a certain flowing rate was set for hadraulic fracturing. After the fracturing work was completed, the cement block was opened to observe the hydraulic fracture propagation pattern.</p><p>The results showed that the ultimate fracture geometries could be classified into three categories: simple bedding fracture, slight turning fracture, stair-like fracture, and multilateral fishbone-like fracture network. Here comes some research knowledge:(1)When the difference between the vertical stress and the minimum horizontal principal stress is less than 12Mpa, the hydraulic fracture will only expand along the rock bedding plane Furthermore. (2)when the vertical stress difference is close to 14 MPa, hydraulic fractures will generate vertical fractures that will communicate multiple beddings of the rock. (3)Increasing flowing rate will cause a slight turning or jumping fractures and improve the complexity of fractures to a certain extent. (4)because of the influence of beddings and lithology,the fracture pressure is usually high.</p><p><strong>Key words:</strong> Hydraulic fracturing, tight reversior Bedding plane, fracture morphology.</p>

Calculation of hydraulic fracture induced stress and corresponding fault slippage in shale formation

Fuel ◽  
2019 ◽  
Vol 254 ◽  
pp. 115525 ◽  
Author(s):  
Kui Liu ◽  
Arash Dahi Taleghani ◽  
Deli Gao
Keyword(s):  
Hydraulic Fracture ◽  
Induced Stress ◽  
Shale Formation

A homogenization approach for modeling a propagating hydraulic fracture in a layered material

Geophysics ◽  
2017 ◽  
Vol 82 (6) ◽  
pp. MR153-MR162 ◽  
Author(s):  
Egor V. Dontsov
Keyword(s):  
Elastic Properties ◽  
Hydraulic Fracture ◽  
Local Stress ◽  
Transversely Isotropic ◽  
Horizontal Stress ◽  
Layered Material ◽  
Elastic Response ◽  
Effective Parameters ◽  
Fine Mesh ◽  
Minimum Horizontal Stress

Shales are known to have a finely layered structure, which greatly influences the overall material’s response. Incorporating the effect of all these layers explicitly in a hydraulic fracture simulator would require a prohibitively fine mesh. To avoid such a scenario, a suitable homogenization, which would represent the effect of multiple layers in an average sense, should be performed. We consider a sample variation of elastic properties and minimum horizontal stress versus depth that has more than a hundred layers. We evaluate methodologies to homogenize the stress and the elastic properties. The elastic response of a layered material is found to be equivalent to that of a transversely isotropic material, and the explicit relations for the effective parameters are obtained. To illustrate the relevance of the homogenization procedure for hydraulic fracturing, the propagation of a plane strain hydraulic fracture in a finely layered shale is studied. To reduce the complexity of the numerical model, elastic layering is neglected and only the effect of the stress layers is analyzed. The results demonstrate the ability of the homogenized stress model to accurately capture the hydraulic fracture behavior using a relatively coarse mesh. This result is obtained by using a special asymptotic solution at the tip element that accounts for the local stress variation near the tip, which effectively treats the material at the tip element as nonhomogenized.

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