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Title: Experiment design study in 3D DC resistivity: Adjoint sensitivities in a horizontal steel-cased borehole.

Abstract

Abstract not provided.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
CARBO CRADA
OSTI Identifier:
1400027
Report Number(s):
SAND2016-10202C
648202
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the SEG Annual Meeting held October 16-20, 2016 in Dallas, TX.
Country of Publication:
United States
Language:
English

Citation Formats

BLANK AUTHORITY TEXT, BLANK AUTHORITY TEXT, and Knox, Hunter Anne. Experiment design study in 3D DC resistivity: Adjoint sensitivities in a horizontal steel-cased borehole.. United States: N. p., 2016. Web.
BLANK AUTHORITY TEXT, BLANK AUTHORITY TEXT, & Knox, Hunter Anne. Experiment design study in 3D DC resistivity: Adjoint sensitivities in a horizontal steel-cased borehole.. United States.
BLANK AUTHORITY TEXT, BLANK AUTHORITY TEXT, and Knox, Hunter Anne. Sat . "Experiment design study in 3D DC resistivity: Adjoint sensitivities in a horizontal steel-cased borehole.". United States. doi:. https://www.osti.gov/servlets/purl/1400027.
@article{osti_1400027,
title = {Experiment design study in 3D DC resistivity: Adjoint sensitivities in a horizontal steel-cased borehole.},
author = {BLANK AUTHORITY TEXT and BLANK AUTHORITY TEXT and Knox, Hunter Anne},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}

Conference:
Other availability
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  • Abstract not provided.
  • The sensitivity analysis showed that the effects of the casing resulted in a reduction of the radial extent and vertical elongation of the sensitivity pattern in the medium. The sensitivities from the pole-pole and pole-dipole arrays showed that they had nor or limited regional coverage. The dipole-dipole arrays was the best configuration to resolve the resistivity of the elements from measurements where the casing was used. It was the most flexible array and could produce different regional responds by altering the lengths and locations of the dipoles. The inversion of synthetic data indicated that images of the medium can bemore » produced. The data were calculated from a model composing of a highly conductive cylinder embedded in a 3-layer medium. The layer could be imaged to about 5--9m away from the casing for a single hole survey while the crosshole configuration was able to reconstruct the layer accurately.« less
  • A study was undertaken to investigate the feasibility of sonic logging in a cased borehole. Results were obtained from a scaled-model laboratory experiment and from computer simulations. The waveforms from the computer model indicate that sonic logging can be successful in bonded and unbonded cased holes. A slowness-time semblance signal processing technique is used to obtain wave velocities from waveforms.
  • A 700 ft. cased hole horizontal well was gravel packed and completed in the Alba Field, Central North Sea. The completion incorporated a number of new technologies adopted for a horizontal cased hole completion including both equipment and fluids. The zone was completed in 2 stages using a horizontal stack pack approach. Perforation packing was optimized by performing a staged acid prepack with the guns in the hole utilizing a low density synthetic gravel substitute in a shear thinning carrier fluid. This was a world first achievement at a cased hole gravel pack using the stack pack approach in amore » horizontal well. A solids free fluid loss control material was evaluated and chosen for the high permeability Alba sands (3 Darcy). Extensive lab testing was performed to ensure minimal damage from various fluids. A 30 ft. physical model was used to optimize annular pack efficiency. A gravel placement computer simulation was used to design pump rate, sand concentration and gel loading in order to optimize annular and perforation pack efficiency.« less