Colloidal Dispersion Gels (CDG) in Dina Cret?ceos Field: From Pilot Design to Field Implementation and Performance
- Ruben Hernan Castro (ECOPETROL, S.A.) | Gustavo Adolfo Maya (Ecopetrol SA) | Jorge Sandoval (Ecopetrol SA) | Juan Manuel Leon (Ecopetrol SA) | Jose Francisco Zapata (Ecopetrol SA) | Adriano Lobo (Ecopetrol SA) | Darwin Oswaldo Villadiego (ECOPETROL, S.A.) | Luis Carlos Perdomo (ECOPETROL, S.A.) | Fernando Ariel Cabrera (TIORCO, Inc.) | Mehdi Izadi (TIORCO, Inc.) | Jorge Luis Romero (TIORCO Inc) | Charles Norman (TIORCO, Inc.) | Eduardo Jose Manrique (TIORCO, Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Enhanced Oil Recovery Conference, 2-4 July, Kuala Lumpur, Malaysia
- Publication Date
- Document Type
- Conference Paper
- Society of Petroleum Engineers
- 2.5.2 Fracturing Materials (Fluids, Proppant), 7.3.3 Project Management, 6.5.2 Water use, produced water discharge and disposal, 6.3.7 Safety Risk Management, 5.4.1 Waterflooding, 5.7.2 Recovery Factors, 4.1.5 Processing Equipment, 3.2.6 Produced Water Management, 5.6.5 Tracers, 2.4.3 Sand/Solids Control, 5.6.4 Drillstem/Well Testing, 7.1.10 Field Economic Analysis, 4.1.2 Separation and Treating, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 4.2.3 Materials and Corrosion, 5.2.1 Phase Behavior and PVT Measurements, 3 Production and Well Operations, 7.1.9 Project Economic Analysis, 5.5.8 History Matching
- Microgels, CDG, Colombia, Dina, EOR
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Dina Cretaceous Field is located in the Upper Magdalena Valley (UMV) Basin, Colombia. Dina Field operated by ECOPETROL S.A. (discovered, 1969) started peripheral water in 1985. Based on high water cuts (96%) and recovery factors of 32%, comprehensive enhanced oil recovery (EOR), screening evaluation began late 2009, identified Colloidal Dispersion Gel (CDG) as an optimum EOR method for the field.
This paper summarizes Dina CDG project from the laboratory to the field evaluation. Laboratory studies include basic fluid/fluid evaluation, static adsorption, CDG formulations, slimtube, and coreflood tests. Pilot area selection was based on a comprehensive reservoir and injection/production data analysis, water management, well integrity, among other factors. Pilot design was based on detailed numerical simulations using sector and full field models. CDG pilot design also considered water handling limitations and potential injectivity constraints due to the narrow margin of maximum injection and reservoir pressures, combined with low reservoir permeability (50 to 200 mD).
Peripheral CDG pilot included one injector and three producers. CDG injection began in June 2011 and as of September 2012, approximately 437,000 bbl of CDG have been injected (5% of pilot PV). CDG injection strategy considered a fix polymer concentration of 400 ppm and a variable polymer/crosslinker ratio ranging from 40:1 to 80:1; to control maximum injection pressure. Field results showed an important increase in oil recoveries (oil productivity up to 300%) and reduction of water cut decrease (10%). After 16 months, no polymer had been produced in offset producers. Main operating challenges experienced during the pilot project included; the improvement in water quality and its impact on CDG injectivity which will also be described.
This study provides guidance to successfully design, implement, and evaluate CDG pilot projects and other potential chemical EOR technologies in waterflooded reservoirs. Lessons learned during pilot testing contributed to defining pilot expansion strategies supported by an integrated decision-risk management approach.
|File Size||1 MB||Number of Pages||12|