Thursday, February 23rd
8:00am – 9:00am US Central Time
Presentation 1: 08:00 AM
Cased Hole Microfrac – Using a Workover Well to Calibrate a Geomechanics Model
Speaker: Abraham Arias (Baker Hughes)
Abstract : This work presents a case study for the acquisition of in-situ stress data on a cased hole well in Neuquén Basin Argentina with microfrac tests. This stress data was required for calibration of the geomechanical model.
The well on this case study was selected for this data acquisition since a workover was planned to abandon old production intervals. The original plan was to evaluate the stress on five intervals: top sealing zone, top reservoir, middle sealing zone, lower reservoir with polymer alteration and lower reservoir without polymer alteration.
Since this evaluation was done on a cased hole, the evaluation process included: cement/casing evaluation log, to confirm zonal isolation of the suggested intervals; 0.5m perforations with high density/deep penetration charges (19 shots) to ensure wellbore communication with reservoir; and finally, the in-situ stress test using a wireline straddle packer tool for the microfrac operation. This tool is capable of taking several microfrac stations per descent with multiple cycles on each station to confirm the stress measurements.
A total of four stations were completed on the two sealing zones, the top reservoir, and the lower reservoir with polymer alteration. Three or four microfrac cycles were made on each station including step rate test for three of them. Using three interpretation methods for the fracture closure analysis: Square root of time, G-function and log-log plot; it was possible to confirm that the minimum horizontal stress on this formation goes from 0.342 to 0.555 psi/ft for the different intervals.
The in-situ stress measurements obtained with the microfrac stations provided the information needed to fully calibrate the geomechanical model of the region, being able to see the different stresses on the sealing and reservoir formations. This case study also confirms that is possible to complete microfrac test in cased hole, being the first time this measurement is performed in such well type at least in Latin-America. And that wells planned to be workover or abandoned can efficiently be used to obtain in-situ stress measurements during workover.
Abraham Arias
is a Reservoir Engineer with 15+ years of experience in the Oil and Gas
industry. Started his career as a Wireline Field Engineer with
Schlumberger in Norway specializing in Formation Testing and Sampling
tools. He has experienced different locations and reservoir environments
going from Norway to US Gulf of Mexico, Onshore in México, Trinidad and
Tobago and Venezuela. For the past 10 years he has been working on
planning and interpretation of Formation Testing and Sampling tools
including his current position as Reservoir Engineer Discipline Lead for
Latin America within Baker Hughes; where he provides solutions for
Testing and Sampling needs, real time support and interpretation for
Wireline as well as LWD formation testers. He holds a BSc in Physics
Engineering from Tec de Monterrey, Mexico. He has published and
presented 8 papers for different conferences and Symposia.
E-mail: [email protected]
Presentation 2: 08:30 AM
Fluid Mapping While Drilling for Optimal Well Landing Decision – A Case Study from Malaysia
Presenters: Aldrick Garcia-Mayans (slb) and Siti Najmi Farhan Zulkipli (PETRONAS )
Abstract: While
still mostly perceived as an exploration/appraisal formation evaluation
technique, fluid mapping while drilling (FMWD) is an immensely powerful
and disruptive geosteering solution. The combination of InSitu and
while-drilling fluid information, producibility data, petrophysical
information allows optimal positioning of wellbores eventually yielding
increased reservoir drainage. Case study review from the Malay Basin.
Field X is a Malaysian prolific oil field with a strong gas cap and
moderate waterdrive from an anticlinal reservoir structure. The operator
has planned a new greenfield campaign to boost declining production.
Thereby drilling new horizontal oil producers from the existing well
centers. The Late Oligocene - Miocene sandstones are well known
homogenous units. However, salinity, resistivity contrast, and long
transition in the swept zone become a major challenge. Active
production, gas cap, aquifer movement, pressure depletion and complex
porosity and permeability distribution cause uncertainties on the actual
fluid contacts. Fluid typing from conventional petrophysical
measurements is inconclusive. Modelling for reservoir mapping
resistivity-based measurements highlighted the challenges to land the
wells in the thin oil pay zone with degrading rock quality at the bottom
and uncertain oil/water contact depth.
Seven wells have been drilled and logged using a workflow of drilling a
highly deviated pilot section through the reservoir sequence to acquire
critical subsurface data, identify actual fluid contacts and set the
appropriate landing point. An FMWD service was integrated in the
bottomhole assembly to provide a comprehensive reservoir fluid
characterization while mitigating operational risks. Conventional long
pump-outs were fragmented into a set of repeat shorter ones at same
depths within a stationary time limit set by the drilling team. Fluid
characterization was thereby safely and efficiently performed by
ensuring proper control of borehole stickiness and without compromising
the formation evaluation objectives or clean-up process.
Acquired fluid information in the sand sequence provided the asset team
with insights of the fluid distribution and contacts in the reservoir,
yielding increased accuracy on the landing position of the subsequent
producing sections, and well producibility.
Bio: Aldrick Garcia Mayans is a Principal Reservoir Engineer for SLB. He is currently the LWD Reservoir Domain Champion for Asia. Located in Jakarta, Indonesia, he joined SLB in 2004 and has held several positions in field operations, management and as Domain Champion in the Well Construction Division.
E-mail: [email protected]
Bio: Siti Najmi Farhan Zulkipli is currently Principal Petrophysicist in PETRONAS based in Kuala Lumpur Malaysia. She joined PETRONAS since 2009 and had experience in operation, formation evaluation, new technology deployment, asset acquisition, full field study, production and surveillance covering a broad subsurface portfolio both in domestic and international PETRONAS assets. She had authored more than 20 technical papers to date and had been an active member for SPE and SPWLA.
E-mail: [email protected]
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