Panos Dalamarinis Bio:
Panos Dalamarinis has 15 years of combined research and operational experience in Oil and Gas. Areas of expertise include hydraulic fracturing design for conventional and unconventional reservoirs, production optimization and re-stimulation, and Enhanced Oil Recovery (EOR).
Panos has performed engineered completion designs, optimization studies and real time engineered completions in multiple unconventional basins in onshore US, Europe, Australia and China. He has over 25 scientific papers in international journals and conferences and a book in energy geopolitics. Also holds 4 US patents on the field of hydraulic fracturing and production optimization for unconventional resources.
Currently he is the Technical Advisor at DG Petro Oil & Gas Group of Companies.
Presentation Abstract:
In conventional reservoirs secondary and tertiary oil recovery have been established methods to increase reserves and extend the production life. In unconventional reservoirs with matrix permeability being as low as nano-Darcy traditional EOR methods have to prove their technical, physical, and economic viability. A new concept for EOR which is used to improve injectivity in SWD wells has been successfully applied in the Permian Basin resulting in production uplift and EUR increase.
The concept/idea was simple. The fracture system that is created during hydraulic fracturing operations is the subsurface pathway for the reservoir fluids to the wellbore. This pathway is subject to scale, paraffins and biofilm depositions as are surface flow lines and facilities. Engineered Chlorine Dioxide (CLO2), a strong oxidizer capable of breaking down and keeping all these proppant pack contaminants in solution, was introduced as an EOR/restimulation agent. Reservoir PVT properties, scale tendencies, and production decline rates were considered to develop “fit for purpose” treatments ranging in volumes between 1,500 – 4,000 bbls of total fluid pumped into the wells.
In our first application of Chlorine Dioxide (CLO2) for restimulation and EOR that was presented in the URTeC 3818857 paper, wells at which a similar artificial lift system was installed demonstrating improved production between 70% to 300%. Chlorine Dioxide treatments were pumped in the same wells multiple times over the last three years (with an average frequency of one year) and every time these wells were re-stimulated, production and Downhole Bottom Pressure were restored to the levels observed after the first treatment (as high as 80% when compared to the wells’ IP rates). Furthermore, the application of this Fracture -EOR (F-EOR) method was expanded in Reeves, Culberson, Pecos, and Martin County with more than 60 treatments pumped at approximately 40 wells with oil gravities from as low as 30o to as high as 55o API, with similar success, proving its effectiveness in different environments. The production uplift that was achieved further validated the theory that production decline in unconventional wells is not related exclusively to reservoir depletion but to the skin damage effect developed inside the fracture system, resulting from scale, biofilm, paraffin, and asphaltene deposition, something that Chlorine Dioxide (CLO2) can effectively remove from the near wellbore area, thus restoring the reservoir/wellbore conductivity.
Production results demonstrate that significant production uplift can be achieved, sometimes >500%. With thousands of legacy wells in inventory, operators can mitigate production decline and deferment with Chlorine Dioxide treatments, mitigating the need to constantly drill new wells to achieve production targets.