geoVISION
Resistivity imaging for productive drilling
geoVISION
Resistivity imaging while drilling helps position wells
in the best place in the reservoir in less time.
eal-time resistivity
measurements from
the geoVISION* imagingwhile-drilling service make
drilling more productive by saving
rig time and reducing costs.
The high resolution of geoVISION
images reveals formation
structure and geological features,
allowing wells to be steered
to the best place in the reservoir
to enhance production and ROI.
R
Multiple depths of investigation
permit detailed geological
analysis to pinpoint reserves
and optimize completion designs
and stimulation strategies.
Welcome to productive drilling*.
FLEXIBLE BHA CONFIGURATIONS
Resistivity measurements from the
geoVISION imaging-while-drilling
service can detect and image
thin-bed resistivities in conductive
BENEFITS
Cuts costs by providing
key inputs for optimizing
completion design and
stimulation strategy
Identifies thin bed pay zones
in conductive mud environments
Facilitates putting horizontal
wells in the best place within
a reservoir by showing wellbore
location relative to structure
Saves rig time by acquiring
data while drilling
Provides accurate
resistivity measurements
in high-resistivity formations
mud environments. This information
provides the detailed geological
analysis required for geosteering
precision in wellbores as small
as 81⁄2 in.
The geoVISION downhole tool can
be configured to make up to five
resistivity measurements. Three
azimuthally focused 1-in button
electrodes, spaced longitudinally
along the axis of the tool, provide
multiple depths of investigation that
permit quantification of invasion
profiles. An integral, cylindrical
electrode delivers a high-resolution,
Gamma Ray
(gAPI)
0
ROP
150 75 25
(ft/h)
lateral resistivity referred to as
ring resistivity. A bit resistivity
measurement allows real-time
coring and casing point selection
in both conductive and resistive
mud environments.
torsional and lateral shock records,
and temperature measurements.
REAL-TIME IMAGING AND DIP
CALCULATION FOR ENHANCED
WELL PLACEMENT
The azimuthally acquired electrode
measurements are displayed
as fullbore images in real time to
graphically describe formation
resistivity. Advanced built-in
processing allows structural dip
to be calculated downhole and
transmitted to the surface in real
time. This provides information
about formation structure and
Placement of the geoVISION tool
in a BHA can be directly above
the bit, near the bit, or above
other components—allowing
broad flexibility in BHA
configuration. In addition to
five resistivity measurements,
the geoVISION tool acquires
azimuthal gamma ray data,
Orientation Top of Hole
0
120
240
360
Resistive
Conductive
Orientation Top of Hole
0
120
240
360
Resistive
Conductive
Dynamic geoVISION Image
Dynamic FMI Image
-5
(º)
95
Gamma Ray
(gAPI)
0
Events
All data acquired are stored in
memory and can be sent to the
surface in real time or downloaded
when the tool is returned to the
surface. Advanced processing
and interpretation can be done
at the computing center by the
same analyst who interprets
FMI* Fullbore Formation
MicroImager images.
Orientation Top of Hole
0
120
240
360
Resistive
Conductive
Orientation Top of Hole
0
120
240
360
Resistive
Conductive
Dynamic geoVISION Image
Dynamic FMI Image
MD
1 : 20
MD
1 : 60
Static geoVISION Image
ROP
150 75 25
(ft/h)
other geological features, which
aids precise placement of a
wellbore within a reservoir.
Static geoVISION Image
Bed boundary
Concretion
Concretion
Resistive fractures
Longitudinal induced conductive fracture
Concretions
Conductive fracture (natural)
Partially healed fracture
Resistive fracture (healed)
The consistency of these geoVISION and FMI images, acquired over the same intervals in Barnett shale, demonstrates the ability
of geoVISION imaging while drilling to provide the resistivity measurements required for detailed geological analysis.
Put wells in the best place with
high-resolution multidepth geoVISION
resistivity measurements.
-5
(º)
Events
95
Reach TD in less time with productive drilling
ACQUISITION OF HIGH-RESOLUTION
BOREHOLE IMAGES WHILE
DRILLING SAVES RIG TIME
AND REDUCES COSTS
The high-resolution borehole
images provided by the geoVISION
service facilitate detailed geological
and geomechanical analyses in
conductive mud environments.
By providing the measurements
required to identify natural fractures
contributing to well productivity—
and both the natural and induced
fractures necessary to understand
the orientation of formation stresses
around the borehole—geoVISION
imaging delivers key information
for devising successful completion
strategies. Because geoVISION
resistivity imaging can be combined
with other services, the need
for an additional logging run can
be eliminated, resulting in rig time
savings and reduced drilling costs.
RESISTIVITY IMAGING-WHILEDRILLING IDENTIFIES FRACTURES
IN BARNETT SHALE
In an 81⁄ 2-in well drilled in the Texas
Barnett shale, geoVISION borehole
images were used to successfully
identify faults, open and healed
fractures, structural and
stratigraphic dip magnitudes
and directions, and minimum
and maximum stress orientations.
A drillpipe-conveyed FMI imager
was also run in the horizontal
section of this well for comparison.
The consistency in interpretation
of the FMI and geoVISION
images provided the validation
and confidence necessary to run
geoVISION services in future
Barnett shale wells.
Quality images provided by the geoVISION service
can help pinpoint reserves in the diverse shale gas
plays found in the continental United States.
Niobrara
Gammon
Bakken
Excello/Mulky
New Albany
Antrim
Green River
Cane Creek
Monterey
Devonian/Ohio
McClure
Floyd and
Conasauga
Lewis and Mancos
Palo Duro
Barnett and
Woodford
Caney and
Woodford
Woodford
Barnett
Fayetteville
Resistivity imaging-while-drilling service
geoVISION Resistivity Specifications
General Specifications
Collar dimensions
Nominal diameter
Maximum diameter
Upper head connection
Lower head connection
Operating temperature
Standard configuration
High-temperature configuration
Tool length and weight
Length
Weight
Mechanical Specifications
Dogleg severity
Rotary mode
Sliding mode
Bending strength ratio (BSR)
Upper connection BSR
Lower connection BSR
Equivalent bending stiffness
Average inertia
Axial and rotational load
Maximum weight on bit
Maximum jarring load
Maximum rotary torque
Hydraulics
Maximum external pressure
Standard flow range
Pressure drop constant (C )
Measurement Performance
Resistivity
Range
Accuracy
0.1 to 250 ohm.m
250 to 500 ohm.m
500 to 5,000 ohm.m
Noise floor
Resistivity response
Vertical resolution
Depth of investigation
Resistivity environments
Water-base mud
Oil-base mud
Gamma ray
Range
Accuracy
Statistical resolution
Vertical resolution
Bit
12 to 24 in
12 in
APPLICATIONS
geoVISION675* system
geoVISION825* system
6.75 in
7.75 in
5 1/2 FH box
4 1/2 Reg pin
8.25 in
9.5 in
6 5/8 in FH box
6 5/8 in Reg box
300 degF [150 degC]
N/A
300 degF [150 degC]
N/A
10.12 ft [3.08 m]
1,200 lbm [544.3 kg]
12.72 ft [3.88 m]
2,400 lbm [1,088.6 kg]
8°/100 ft
16°/100 ft
7°/100 ft
13°/100 ft
2.10
2.68
10 ft of 6.5 × 2.81
84 in4
2.44
2.56
13.5 ft of 8 × 2.81
168 in4
71,000,000/L† lbf
330,000 lbf
16,000 ft.lbf
164,000,000/L† lbf
640,000 lbf
23,000 ft.lbf
18,000 psi
0 to 800 galUS/min
135,000
15,000 psi
0 to 1,200 galUS/min
790,000
Bit and ring
0.2 to 20,000 ohm.m
Azimuthal button electrode
0.2 to 20,000 ohm.m
± 5%
± 10%
± 20%
0.2 mS
Ring
2 to 3 in
7 in
± 5%
± 10%
± 20%
0.2 mS
Medium
2 to 3 in
3 in
Deep
2 to 3 in
5 in
Shallow
2 to 3 in
1 in
Because geoVISION resistivity is a laterolog measurement, the geoVISION tool should be run
under conditions where Rxo is less than or approximately equal to Rt to ensure that the tool
is sensitive to Rt when there is significant invasion.
Correlation with bit resistivity only
0 to 250 gAPI
± 7%
± 3 gAPI at 100 gAPI and 100 ft/h
1.5 in
† L is the distance in ft between the stabilizer above the tool and the stabilizer below it.
Real-time image and dip
calculation to help position
wells in the best place
in the reservoir
Real-time geostopping
for coring and casing point
selection in both oil- and
water-base muds
High-resolution imaging
for fracture identification
and complex interpretations
Invasion profile analysis
Thin bed analysis
FEATURES
Three azimuthally focused
electrode resistivity
measurements
High-resolution focused
ring resistivity
At-the-bit resistivity
Azimuthal gamma ray
High-resolution multidepth
resistivity image with
full coverage
Enhanced resolution
image processing
Combinable with all other
Schlumberger drilling and
measurement services
Runnable directly above the
bit for enhanced geosteering
Resistivity measurements
to 20,000 ohm.m
geoVISION
Resistivity imaging
provides multiple
depths of investigation
for productive drilling.
www.slb.com/vision
*Mark of Schlumberger Copyright © 2007 Schlumberger. All rights reserved. 07-DR-122