rt scanner · rt scanner rt scanner* triaxial induction service calculates vertical and horizontal...
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Rt Scanner
Rt Scanner* triaxial induction service calculatesvertical and horizontal resistivity (Rv and Rh, respectively) from direct measurements while simultaneously solving for formation dip at any welldeviation. Making measurements at multiple depths of investigation in three dimensions ensures that the derived resistivities are true 3D measurements.The enhanced hydrocarbon and water saturationestimates computed from these measurements result in a more accurate reservoir model and reserves estimates, especially for laminated,anisotropic, or faulted formations.
The compact, one-piece Rt Scanner tool has six triaxial arrays, each containing three colocated coils measuring at various depths into the formation.Rv and Rh are calculated at each of the six triaxialspacings. Three single-axis receivers are used tofully characterize the borehole signal to remove it from the triaxial measurements. In addition to the resistivity measurements, formation dip and azimuthare calculated for structural interpretation.
Shale
Sand
Gamma RaygAPI20 60
MDft
Gamma Ray
gAPI20 60
Sand Fraction0 1.5
Neutron-Density Crossover
Neutron Porosity
60 0%Density
1.65 2.65g/cm3
Rh (deep)0.2 200ohm.m
0.2 200ohm.m
0.2 200ohm.m
Rv (deep)
Induction Resistivity 90 in
Gas Anisotropic
Gas Classic
%100 0Sw Pa
y Clas
sic
Pay A
nisot
ropic
Bound WaterClassic
Water Classic
Gas Classic
%50 0Fluid Volume
Bound WaterAnisotropic
Water Anisotropic
Gas Anisotropic
%50 0
Fluid Volume
0º 120º 240º 360º
Conductive Resistive
Borehole ImageResistivity
The hydrocarbon saturation calculated from Rv and resistivity anisotropy clearly indicates the presence of hydrocarbon that otherwise would have been overlooked using classic resistivity measurement of Rh only.
APPLICATIONS
� Determination of true resistivity,Rt
� Determination of water saturation, Sw
� Low-resistivity pay� Laminated formations� Structural analysis� Thin-bed analysis� Invasion profiling� Reservoir delineation
www.slb.com/oilfield
*Mark of SchlumbergerCopyright © 2007 Schlumberger. All rights reserved. 07-FE-078
Rt Scanner
Along with advanced resistivityand structural information, the Rt Scanner tool delivers standard AIT* Array Induction Imager Toolmeasurements for correlationwith existing field logs. The tool’sinnovative design provides thiscomplete resistivity informationwith no additional hardware. The Rt Scanner tool is also fully combinable with Platform Express* and most openhole services.
Specifications
Output Rv, Rh, AIT logs, spontaneous potential, dip, azimuthMax. logging speed 1,097 m/h [3,600 ft/h]Combinability Platform Express platform and most openhole servicesMax. temperature 150 degC [302 degF]Max. pressure 137,895 kPa [20,000 psi]Outside diameter 9.84 cm [3.875 in]Length 5.97 m [19.6 ft]Weight 183 kg [404 lbm]Max. tension† 111,205 N [25,000 lbf]Max. compression† 26,689 N [6,000 lbf]†Limits derived at 150 degC and 0 psi