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CASE HISTORY
NEO Service Using RPM Enabled Through-Casing Formation
Evaluation,
Identified Pay Zones for Perforation
Location:
Ecuador, Latin America
Results
■ Emulated formation resistivity, neutron
porosity and density using RPM data
■ Enabled formation evaluation analysis to
identify pay zones
■ Reduced deployment risks, rig time, and
costs for the customer
Challenge
■ Wellbore geometry restrictions and depleted
reservoir conditions prohibited openhole log
acquisition
■ Minimize rig time, costs, and HS&E risks of
radioactive source deployment
■ Petrophysical analysis cannot be performed
without conventional formation evaluation
data
Baker Hughes solution
The log on the left indicates a good match between the NEO service emulated logs and the openhole logs in the
shallow section
of the well that helped increase confidence in the NEO service emulated logs. The log on the right
shows the NEO service emulated curves in the bottom section of the well that identified the pay zones for perforation.
A major Ecuadorian exploration company operating
in the Sacha
field of Ecuador required formation
evaluation to perform conventional petrophysical
analysis for identifying oil saturation. Openhole
logging was prohibited due to the wellbore geometry
restrictions and depleted reservoir conditions, which
could increase the probability of radioactive-sourcebearing tools getting stuck. If the radioactive-source got lost in the hole, operating costs
bearing tools
and lost time could have increased significantly and
possibly resulted
in a complete loss of the
exploration block. The operator required
conventional
petrophysical analysis, even though
openhole data acquisition was not feasible.
Baker Hughes deployed the NEO™ neutronemulated openhole
log service to emulate openhole
logs for petrophysical analysis. Data was acquired
through the casing using the multi-detector, pulsed neutron Reservoir Performance Monitor (RPM™)
instrument. Logging through the casing significantly
reduced deployment risks. The RPM instrument,
which uses a pulsed-neutron source—a nonchemical radioactive source—eliminated health,
safety, and environment (HS&E) hazards
associated with radioactive-source deployments,
and reduced rig time and costs.
Baker Hughes acquired openhole and RPM data in
the first (training) well. The NEO service developed
a neural-network model to emulate the openhole
logs using RPM data. On the second (application)
well, validity of the neural-network model was
confirmed by comparing the openhole logs and
emulated openhole logs. In the subsequent
application well, the operator could not acquire
conventional openhole data in the deeper pay
zones.
■ NEO neutron-emulated openhole log service
■ Reservoir Performance Monitor (RPM)
instrument
the shallow section provided the desired
confidence in the emulated dataset.
The petrophysical analysis using the NEO curves
showed average oil saturation of ~42%. After
perforating both zones, the stabilized production
results showed 42% water production, confirming
the results of the petrophysical analysis.
The NEO service emulated formation resistivity,
neutron porosity, and density data in the pay
zones. Good correlation with the openhole data in
Disclaimer of Liability: This information is provided for general information purposes only and is believed to be accurate as of the date hereof; however, Baker Hughes Incorporated and its affiliates do not make any warranties or representations of any kind regarding
the information and disclaim all express and implied warranties or representations to the fullest extent permissible by law, including those of merchantability, fitness for a particular purpose or use, title, non-infringement, accuracy, correctness or completeness of the
information provided herein. All information is furnished “as is” and without any license to distribute. The user agrees to assume all liabilities related to the use of or reliance on such information. BAKER HUGHES INCORPORATED AND ITS AFFILIATES SHALL NOT
BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES FROM ANY CAUSE WHATSOEVER INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE.
© 2015 Baker Hughes Incorporated. All rights reserved. 42745 02/2015
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CASE HISTORY
The density, neutron, and resistivity crossplots indicated a
good correlation between the NEO service emulated data
and the conventional openhole data.
The petrophysical analysis using NEO service deliverables identified the pay
zones for perforation, marked in red.
Disclaimer of Liability: This information is provided for general information purposes only and is believed to be accurate as of the date hereof; however, Baker Hughes Incorporated and its affiliates do not make any warranties or representations of any kind regarding
the information and disclaim all express and implied warranties or representations to the fullest extent permissible by law, including those of merchantability, fitness for a particular purpose or use, title, non-infringement, accuracy, correctness or completeness of the
information provided herein. All information is furnished “as is” and without any license to distribute. The user agrees to assume all liabilities related to the use of or reliance on such information. BAKER HUGHES INCORPORATED AND ITS AFFILIATES SHALL NOT
BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES FROM ANY CAUSE WHATSOEVER INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE.
© 2015 Baker Hughes Incorporated. All rights reserved. 42745 02/2015