Numerical simulation of dual‐laterolog measurements in the presence of dipping, anisotropic, and invaded rock formations

2005 ◽  
Author(s):  
Wei Yang ◽  
Carlos Torres‐Verdín
Keyword(s):  
Numerical Simulation ◽  
Rock Formations ◽  
Dual Laterolog

Numerical simulation and fracture evaluation method of dual laterolog in organic shale

2014 ◽  
Vol 100 ◽  
pp. 1-13 ◽  
Author(s):  
Maojin Tan ◽  
Peng Wang ◽  
Jun Li ◽  
Qiong Liu ◽  
Qinshan Yang
Keyword(s):  
Numerical Simulation ◽  
Evaluation Method ◽  
Dual Laterolog ◽  
Organic Shale

Numerical simulation of the dual laterolog for carbonate cave reservoirs and response characteristics

2011 ◽  
Vol 8 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Mao-Jin Tan ◽  
Jie Gao ◽  
Xiao-Chang Wang ◽  
Song-Yang Zhang
Keyword(s):  
Numerical Simulation ◽  
Response Characteristics ◽  
Dual Laterolog

Numerical Simulation of Dual Laterolog in Cavernous Carbonatite Reservoir

2015 ◽  
Vol 73 ◽  
pp. 758-762
Author(s):  
Jun Zhao ◽  
Di Wang ◽  
Hongwei Gu
Keyword(s):  
Numerical Simulation ◽  
Dual Laterolog

scholarly journals Simulation of DC dual-laterolog measurements in complex formations: A Fourier-series approach with nonorthogonal coordinates and self-adapting finite elements

Geophysics ◽  
2009 ◽  
Vol 74 (1) ◽  
pp. E31-E43 ◽  
Author(s):  
Myung Jin Nam ◽  
David Pardo ◽  
Carlos Torres-Verdín
Keyword(s):  
Fourier Series ◽  
Apparent Resistivity ◽  
Adaptive Finite Element Method ◽  
Fourier Series Expansion ◽  
Electrical Anisotropy ◽  
Rock Formations ◽  
Resistivity Logs ◽  
Dip Angle ◽  
Dual Laterolog ◽  
Deviated Wells

Dual laterolog (DLL) makes use of a galvanic conduction principle to focus electrical currents into rock formations, thereby minimizing shoulder and borehole effects in the measurement of formation resistivity. The tool includes two separate focusing systems: deep-sensing (LLd) and shallow-sensing modes (LLs). Laterolog current-focusing systems were designed for operation primarily in vertical boreholes penetrating horizontal layers; only recently their design has been revised for operation in deviated wells in the presence of electrical anisotropy. We simulated three-dimensional (3D) DLL measurements in dipping, invaded, and electrically anisotropic formations and appraised the corresponding effects on apparent resistivity logs. Simulations were performed by combining the use of a Fourier-series expansion in a nonorthogonal system of coordinates with an existing 2D goal-oriented, higher-order, and self-adaptive finite-element method. This numerical algorithm yields accurate solutions in limited CPU time because only a few Fourier modes are needed to simulate practical applications. For the calculation of focused currents, we introduced an embedded postprocessing method that incorporates a synthetic focusing principle to compute current intensities at each iterative step of optimal mesh refinements. Our numerical method accurately simulates 3D DLL measurements in rock formations that exhibit extreme contrasts of electrical resistivity. Simulations indicate that LLs resistivity logs are more sensitive to both invaded and anisotropic layers than LLd resistivity logs. In deviated wells, shoulder-bed effects on apparent resistivity logs increase with an increase of dip angle, and are emphasized across thin conductive layers. Electrical anisotropy effects on apparent resistivity logs increase substantially with dip angle.

scholarly journals Numerical Simulation of Dual Laterolog Response in Directional Wells and Development of Correction Plate

2017 ◽  
Vol 02 (04) ◽  
pp. 237-248
Author(s):  
Xiao-Wei Ni ◽  
Si-Hui Xu ◽  
Guan-You Xu ◽  
Xuan-Feng Ao ◽  
Jiaming Feng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Dual Laterolog

NUMERICAL SIMULATION AND CHARACTERISTICS ANALYSIS OF DUAL LATEROLOG IN CAVERNOUS RESERVOIRS ON THE BASIS OF 3D-FEM

2017 ◽  
Vol 60 (3) ◽  
pp. 266-274
Author(s):  
WANG Lei ◽  
FAN Yi-Ren ◽  
GAO Yan-Wu ◽  
FAN Zhuo-Ying ◽  
WU Zhen-Guan
Keyword(s):  
Numerical Simulation ◽  
3D Fem ◽  
Characteristics Analysis ◽  
Dual Laterolog

scholarly journals Numerical simulation of the dual laterolog response to fractures and caves in fractured-cavernous formation

2012 ◽  
Vol 39 (6) ◽  
pp. 751-757 ◽  
Author(s):  
Shaogui DENG ◽  
Xuanxue MO ◽  
Chunli LU ◽  
Yang ZHANG ◽  
Lailei LIU
Keyword(s):  
Numerical Simulation ◽  
Dual Laterolog

scholarly journals Research on Anchor Cable and C-Shaped Tube Support Method in Deep Layers Roadway, Experimental Study, and Numerical Simulation

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Renliang Shan ◽  
Shupeng Zhang ◽  
Shengchao Xiao ◽  
Junqi Liang
Keyword(s):  
Numerical Simulation ◽  
Design Method ◽  
Soft Rock ◽  
Shear Resistance ◽  
Rock Properties ◽  
Tube Length ◽  
Support Design ◽  
Anchor Cable ◽  
Rock Formations ◽  
Shaped Tube

In roadways with high ground stress or burial depths, the joints distributed within rock formations are subject to complex stresses and interlayer misalignments frequently. Rock bolts and cable bolts anchored in the rock formations are subject to tensile and shear forces. Most of the bolts used in roadway engineering are local anchored, resulting in insufficient shear strength at the bolt free end close to roadway surface and increasing bolts breaking. The anchor cable and C-shaped tube (ACC) is a highly prestressed cable bolt that can withstand high shear force in its free end. This paper examines the effect of the relationship between C-shaped tube length and joint location on the shear resistance of ACC by double shear tests. To fully exploit the ACC’s shear resistance, the C-shaped tube ends should be at least 30 cm beyond the joint. The effect of preload and concrete spray thicknesses on roadway deformation and plastic zone is investigated by numerical simulation. Results show that ACC and concrete spraying layer can form a stable extruded arch structure, so that the broken and soft rock within the loosen zone is in three-dimensional-stress state, effectively improving surrounding rock properties and controlling its deformation size. Based on these results, the ACC support design method is proposed.

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