Array laterolog and dual laterolog resistivity measurements in horizontal wells: A comparative model study

1999 ◽  
Author(s):  
Tsili Wang ◽  
Lei Xiao ◽  
Alberto Mezzatesta
Keyword(s):  
Horizontal Wells ◽  
Resistivity Measurements ◽  
Model Study ◽  
Comparative Model ◽  
Dual Laterolog

Instabilities in the Agulhas Retroflection Current system: A comparative model study

2000 ◽  
Vol 105 (C2) ◽  
pp. 3233-3241 ◽  
Author(s):  
N. C. Wells ◽  
V. O. Ivchenko ◽  
S. E. Best
Keyword(s):  
Current System ◽  
System A ◽  
Model Study ◽  
Comparative Model

The Experimental and Model Study on Variable Mass Flow for Horizontal Wells With Perforated Completion

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Wei Jianguang ◽  
Lin Xuesong ◽  
Liu Xuemei ◽  
Ma Yuanyuan
Keyword(s):  
Pressure Drop ◽  
Mass Flow ◽  
Variable Mass ◽  
Axial Flow ◽  
Horizontal Wells ◽  
Calculation Model ◽  
Frictional Pressure Drop ◽  
Model Study ◽  
Fluid Boundary ◽  
Variable Mass Flow

The variable mass flow in perforated horizontal wells is very complex. One reason is that the perforation can increase the roughness of the pipe wall which will increase the frictional pressure drop. The other is the fluid boundary layer and velocity profile of axial flow will be changed due to the “mixing” of the inflow with the axial flow. The influences of the perforation parameters and flux rate on the pressure drawdown in horizontal wellbore are investigated. The perforation parameters include perforation phasing, perforation diameter, and perforation density. According to the experiment results, some modes such as friction factor calculation model (the accuracy of the model is 4%), “mixing” pressure drop calculation model (the accuracy of the model is 3%), and total pressure drop calculation model (the accuracy of the model is 2%) are developed.

scholarly journals Sensitivity analysis for the appraisal of hydrofractures in horizontal wells with borehole resistivity measurements

Geophysics ◽  
2013 ◽  
Vol 78 (4) ◽  
pp. D209-D222 ◽  
Author(s):  
David Pardo ◽  
Carlos Torres-Verdín
Keyword(s):  
High Frequency ◽  
Horizontal Well ◽  
Low Frequency ◽  
Horizontal Wells ◽  
Hydraulic Fractures ◽  
Electrically Conductive ◽  
Resistivity Measurements ◽  
Electromagnetic Measurements ◽  
Open Hole ◽  
Thin Disks

We numerically evaluate the possibility of using borehole electromagnetic measurements to diagnose and quantify hydraulic fractures that have been artificially generated in a horizontal well. Hydrofractures are modeled as thin disks perpendicular to the well and filled with either sand-based or electrically conductive proppant. The study focuses on the effect of thickness and length (radius) of hydrofractures to assess their effects on specific configurations of borehole-resistivity instruments. Numerical results indicate that several measurements (e.g., those obtained with low- and high-frequency solenoids) could be used to assess the thickness of a fracture. However, only low-frequency measurements performed with electrodes and large-spacing between transmitter and receivers (18 m) exhibit the necessary sensitivity to reliably and accurately estimate the length of long hydrofractures (up to 150 m) in open-hole wells. In the case of steel-cased wells, the casing acts as a long electrode, whereby conventional low-frequency short-spaced, through-casing measurements are suitable for the accurate diagnosis of long hydrofractures (up to 150 m in length).

Comparative Model Study of Geosynthetic Pull-Out Response

1999 ◽  
Vol 6 (1) ◽  
pp. 53-68 ◽  
Author(s):  
N. Gurung ◽  
Y. Iwao
Keyword(s):  
Pull Out ◽  
Model Study ◽  
Comparative Model
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