Dear DPS Member,
The next DPS meeting, featuring two presenters, is on June 5th (Thursday). We meet at our usual venue at Kivi Den Haag (Prinsessegracht 23, 2514 AP Den Haag) in the Molkamer on the 1st floor. Pre-meeting coffee is served at 15:30h and talks commence at 16:00h. Social hour will follow after the talks.
Attendance is free of charge.
Talk 1
A New Approach of In Situ Flow Diagnostic using ultra compact instruments: application to oil & gas and geothermal (Virginie Schoepf, Openfield Technology)
Abstract:
Production logs were obtained using a third generation ultra compact Production Logging Tool (PLT) capable of delivering reliable flow data (holdups and phase velocity) for phase allocation over an interval with multiple zones and different fluid properties. Azimuthal phase holdups and velocities are collocated with one foot away auxiliary measurements of pressure, temperature, MML (CCL), tool orientation, and deviation. Applications to oil & gas and geothermal reservoirs will be presented.
High gas rate wells flowing up to 80 MMSCF/D pose challenges for flow allocation. Conventional methods for measuring gas and water holdups, such as local electrical probes, fail in these extreme conditions due to the extremely small droplets and hydrodynamic effects. Approaches based on fluid column density measurements suffer from large inaccuracies due to friction effects. The ultra compact PL tool string was deployed in several gas wells where segregated flow with water recirculation was observed. Thanks to integrating all types of sensors physics, a robust flow diagnostic allowed the operator to understand the water and gas entries, while the conventional sensors could not, and consider remedial actions for water shutoff. That set of measurements a benchmark for future acquisition in the same field or in analogue conditions.
Dynamic characterization of a geothermal reservoir is key to understand early on the reservoir heterogeneity, connectivity and deliverability and to optimize the production of a geothermal power plant. The presentation will show in situ dynamic flow diagnostic inside geothermal wells using a new compact array tool with distinctive physical miniature measurements. Very good data quality was acquired with various sensors physics to provide a comprehensive flow diagnostic. Flow profile acquired across the reservoir section with the PLT string was compared to cumulative permeability from the static description, which highlighted higher level of heterogeneities than assumed.
Bio:
Virginie Schoepf has been the lead petrophysicist in Openfield Technology, a startup specialised in MEMS technology, since June 2019. She has been supporting and developing petrophysical applications in the domain of flow diagnostics. Virginie started her career with SLB in 2000 as a development engineer in Clamart, France in the cement evaluation team. She later moved to a log-analyst role in production petrophysics within Slb DCS in Aberdeen, Scotland. She held the position of petrophysicist ENGIE and BP, working on all aspects of petrophysics from exploration and appraisal to production and late field applications including decommissioning. holds a MS degree in geophysics from Ecole de Physique du Globe de Strasbourg. She is a member of the SPE, SPWLA and IAH.
Talk 2
Obtaining Remaining Oil Saturation For The Johan Sverdrup Field From a Variety of Logging Data, (Brice Fortier, Equinor / SPWLA Distinguished Lecturer)
Abstract:
Johan Sverdrup, situated on the Norwegian continental shelf, stands as the third largest oil field with a recoverable volume spanning approximately between 2.2 to 3.2 billion barrels of oil equivalent (BOE). The field came on production in October 2019. Given the reservoir’s proximity to hydrostatic pressure, maintaining a consistent production pressure hinges on the concept of voidage replacement. The drainage strategy is seawater and produced water re-injection and, in a subsequent phase, water alternating gas (WAG) injection. The reservoir has excellent reservoir properties and multi-Darcy permeability. The ambition is to recover 70% of hydrocarbon in place; therefore, a comprehensive data acquisition strategy is in place to unravel and optimize reservoir drainage.
Dedicated to waterflooding observation, Well 16/2-D-22 plays a crucial role in this strategy. Drilling the well at the right time, a full suite of open hole logs has been acquired to fully characterize formation and fluids. The well has been completed with an unperforated cemented liner. Pulsed-neutron logging is conducted every 3 months to monitor waterfront evolution and evaluate in-situ water saturation (Sw).
Logging results allow us to evaluate the waterfront evolution pace while also confirming that waterflooding primarily occurs laterally along the most permeable layer. These observations are used in the reservoir and petro-elastic models and validate their overall accuracy.
Notably, the pulsed-neutron-derived water saturation within the flooded zone currently deviates from the estimated residual oil saturation obtained from open hole saturation evaluation and core experiments. To address this discrepancy, a comprehensive investigation has been undertaken, utilizing a multitude of data sources, including advanced nuclear magnetic resonance (NMR) techniques, verified by laboratory measurement. This investigation reveals that the residual of drilling oil-based mud, relatively deep into the borehole wall, may still influence pulsed neutron several years after drilling. It is believed that future well-log acquisitions will contribute significantly to our understanding of this phenomenon.
Bio:
Brice Fortier is the discipline leader for petrophysics for Equinor’s operated Johan Sverdrup and Martin Linge fields, based in Stavanger, Norway. He graduated in 2005 from Ecole de Geologie de Nancy with a master’s degree in geology engineering and in 2006 from IFP-School in Paris as a petroleum geologist. Prior to joining Equinor, he worked with Schlumberger in Luanda, Angola as a wireline field engineer then with Data and Consulting Services as a borehole geologist in Aberdeen, Scotland and Stavanger, Norway. He joined Statoil in 2011 as an asset petrophysicist for the Fram and Vega fields. He has been working with Equinor’s Johan Sverdrup field since 2014. Brice also leads the image-log competence group for Equinor and has been contributing in creating customized internal web based applications to optimize petrophysics workflows.
Looking forward to seeing you there
DPS Board