Multiple Fracture Initiation in Openhole Without Mechanical Isolation: First Step to Fulfill an Ambition

2014 ◽  
Author(s):  
Frank F. Chang ◽  
Kirk Bartko ◽  
Steve Dyer ◽  
Gallyam Aidagulov ◽  
Roberto Suarez-Rivera ◽  
...  
Keyword(s):  
Fracture Initiation ◽  
Multiple Fracture ◽  
Mechanical Isolation

A Laboratory Study of Multiple Fracture Initiation from Perforation Clusters by Cyclic Pumping

2018 ◽  
Vol 52 (3) ◽  
pp. 827-840 ◽  
Author(s):  
Zai-Le Zhou ◽  
Guang-Qing Zhang ◽  
Yue-Kun Xing ◽  
Zong-Yang Fan ◽  
Xi Zhang ◽  
...  
Keyword(s):  
Laboratory Study ◽  
Fracture Initiation ◽  
Multiple Fracture

Successful Coiled Tubing Open-Hole Notching Technique: A Novel Approach to Enhance Multiple Fracture Initiation

2020 ◽  
Author(s):  
Frank Fakuen Chang ◽  
Danish Ahmed ◽  
Mohammad Arifin ◽  
Devesh Pathak ◽  
Adzlan Ayob
Keyword(s):  
Fracture Initiation ◽  
Multiple Fracture ◽  
Coiled Tubing ◽  
Novel Approach ◽  
Open Hole

Multiple-fracturing and viewing of the same frozen sample at different depths using a low temperature FESEM

1996 ◽  
Vol 54 ◽  
pp. 820-821
Author(s):  
M.V. Parthasarathy ◽  
C. Daugherty
Keyword(s):  
Temperature Field ◽  
Low Temperature ◽  
Field Emission ◽  
Multiple Fracture ◽  
Precise Control ◽  
Cold Stage ◽  
Different Depths ◽  
Transfer Device

The versatility of Low Temperature Field Emission SEM (LTFESEM) for viewing frozen-hydrated biological specimens, and the high resolutions that can be obtained with such instruments have been well documented. Studies done with LTFESEM have been usually limited to the viewing of small organisms, organs, cells, and organelles, or viewing such specimens after fracturing them.We use a Hitachi 4500 FESEM equipped with a recently developed BAL-TEC SCE 020 cryopreparation/transfer device for our LTFESEM studies. The SCE 020 is similar in design to the older SCU 020 except that instead of having a dedicated stage, the SCE 020 has a detachable cold stage that mounts on to the FESEM stage when needed. Since the SCE 020 has a precisely controlled lock manipulator for transferring the specimen table from the cryopreparation chamber to the cold stage in the FESEM, and also has a motor driven microtome for precise control of specimen fracture, we have explored the feasibility of using the LTFESEM for multiple-fracture studies of the same sample.

Effective Stimulation of Very Thick, Layered Carbonate Reservoirs Without the Use of Mechanical Isolation

2009 ◽  
Author(s):  
Chris E. Shuchart ◽  
Shalawn Jackson ◽  
Janette Mendez-Santiago ◽  
Nancy Hyangsil Choi ◽  
John K. Montgomery ◽  
...  
Keyword(s):  
Carbonate Reservoirs ◽  
Mechanical Isolation ◽  
Stimulation Of

scholarly journals An Extension Strain Type Mohr–Coulomb Criterion

2021 ◽  
Author(s):  
Manfred Staat
Keyword(s):  
Failure Modes ◽  
Peak Stress ◽  
Fracture Initiation ◽  
Failure Surface ◽  
Confining Pressure ◽  
Biaxial Compression ◽  
Simple Extension ◽  
Strain Criterion ◽  
Shear Component ◽  
Extension Strain

AbstractExtension fractures are typical for the deformation under low or no confining pressure. They can be explained by a phenomenological extension strain failure criterion. In the past, a simple empirical criterion for fracture initiation in brittle rock has been developed. In this article, it is shown that the simple extension strain criterion makes unrealistic strength predictions in biaxial compression and tension. To overcome this major limitation, a new extension strain criterion is proposed by adding a weighted principal shear component to the simple criterion. The shear weight is chosen, such that the enriched extension strain criterion represents the same failure surface as the Mohr–Coulomb (MC) criterion. Thus, the MC criterion has been derived as an extension strain criterion predicting extension failure modes, which are unexpected in the classical understanding of the failure of cohesive-frictional materials. In progressive damage of rock, the most likely fracture direction is orthogonal to the maximum extension strain leading to dilatancy. The enriched extension strain criterion is proposed as a threshold surface for crack initiation CI and crack damage CD and as a failure surface at peak stress CP. Different from compressive loading, tensile loading requires only a limited number of critical cracks to cause failure. Therefore, for tensile stresses, the failure criteria must be modified somehow, possibly by a cut-off corresponding to the CI stress. Examples show that the enriched extension strain criterion predicts much lower volumes of damaged rock mass compared to the simple extension strain criterion.

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