Name
Title | ||
|---|---|---|
Numerical Modeling of Eccentered LWD Borehole Sensors in Dipping and Fully Anisotropic Earth Formations |
Abstract | ||
|---|---|---|
Logging-while-drilling (LWD) borehole sensors are used to provide real-time resistivity data of adjacent earth formations for hydrocarbon exploration. This allows for a proactive adjustment of the dipping angle and azimuth direction of the drill and, hence, geosteering capabilities. The analysis of borehole eccentricity effects on LWD sensor response in full 3 3 anisotropic earth formations is important for correct data interpretation in deviated or horizontal wells. In this paper, we present a cylindrical-grid finite-difference time-domain model to tackle this problem. The grid is aligned to the sensor axis to avoid staircasing error in the sensor geometry but, in general, misaligned to the (eccentered) borehole/formation interface. A locally conformal discretization is used to compute effective conductivity tensors of partially-filled grid cells at those interfaces, involving an isotropic medium (borehole) and a full 3 3 anisotropic medium in general (dipped earth formation). The numerical model is used to compute the response of eccentered LWD sensors in layered earth formations with anisotropic dipping beds. |
Year | DOI | Venue |
|---|---|---|
2012 | 10.1109/TGRS.2011.2162736 | IEEE T. Geoscience and Remote Sensing |
Keywords | Field | DocType |
horizontal wells,sensor axis,well logging,hydrocarbon reservoirs,conformal discretization,fully anisotropic earth formations,borehole eccentricity effects,cylindrical-grid finite-difference time-domain model,anisotropic media,eccentered lwd borehole sensors,layered earth formations,deviated wells,staircasing error,real-time resistivity data,numerical analysis,hydrocarbon exploration,dipping earth formations,dipping angle,geosteering capabilities,drilling (geotechnical),geophysical exploration,numerical modeling,azimuth direction,data interpretation,finite-difference time-domain (fdtd) methods,finite difference time-domain analysis,anisotropic dipping beds,logging-while-drilling,isotropic medium,geometry,real time,tensile stress,earth,sensors,finite difference time domain,conductivity,finite difference method,finite difference methods | Isotropy,Anisotropy,Borehole,Geosteering,Well logging,Finite difference method,Exploration geophysics,Logging while drilling,Geology,Geophysics | Journal |
Volume | Issue | ISSN |
50 | 3 | 0196-2892 |
Citations | PageRank | References |
8 | 0.68 | 13 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Hwa Ok Lee | 1 | 22 | 1.79 |
| Fernando L. Teixeira | 2 | 97 | 16.97 |
| Luis E. San Martin | 3 | 8 | 0.68 |
| Michael S. Bittar | 4 | 25 | 2.94 |