SPE Online Education
EOR for Carbonate Reservoirs Under Extreme Conditions: From R&D to Field Implementation
Recorded On: 06/01/2021
Carbonate reservoirs contain more than 50% of world’s conventional hydrocarbon reserves and on average have ”ultimate” recovery factors between 30-40%. With the insight that the growth rate of “easy oil” supplies (conventional oil and natural gas that are relatively easy to extract) will struggle to keep up with future demand, enhanced oil recovery (EOR) becomes increasingly important to maintain and extend the production from existing oil reservoirs.
Carbonate reservoirs in the Middle East are highly heterogeneous and have complex pore systems, often with triple porosity systems (matrix-vug-fracture) and mixed to oil-wet matrix characteristics. Both geological heterogeneity and wettability have strong impact on remaining oil saturation and its distribution and hence on oil recovery and sweep efficiency and on the choice of EOR options to be applied in such reservoirs. In addition to geology and wettability, the specific properties of the reservoirs in Abu Dhabi makes EOR challenging. Chemical EOR options have large potential to either target remaining oil saturation in waterflooded areas or bypassed oil in low permeability layers or small pores. However, the reservoirs are at high temperature (~100-130 oC), the formation brine is of high salinity (~200,000 ppm) and contains high concentrations of divalent ions (~18,000 ppm of Ca++ and Mg++). Such harsh conditions of the carbonate reservoirs in Abu Dhabi (high temperature and salinity) pose a major challenge to chemical EOR. Hence there is a general lack of experience or analogue in the industry on EOR in general and chemical EOR in particular for such carbonate reservoirs.
ADNOC has recently developed an EOR roadmap in which we have reviewed the available EOR concepts, their maturity and applicability to Abu Dhabi carbonate reservoirs. A large R&D program has been developed to mature EOR concepts for such harsh reservoir conditions in addition to designing innovative hybrid EOR options to target large volumes of by-passed oil in such reservoirs. This presentation will discuss the journey of bringing EOR from R&D to field implementation for carbonate reservoirs under high-temperature and high-salinity conditions.
This webinar is categorized under the Reservoir technical discipline.
All content contained within this webinar is copyrighted by Dr. Shehadeh Masalmeh and its use and/or reproduction outside the portal requires express permission from Dr. Shehadeh Masalmeh.
Dr. Shehadeh Masalmeh
Senior Advisor Reservoir Engineering and EOR and SCAL Expert, ADNOC
Dr. Shehadeh Masalmeh is currently Senior Advisor Reservoir Engineering and EOR and SCAL Expert with ADNOC. Masalmeh holds a PhD in Physics from Leiden University and joined Shell in 1997 where he worked in the Rijswijk Technology Centre and then had several international assignments.
In his career, he developed extensive expertise on both sandstone and carbonate reservoirs characterization and development, EOR pilot design and implementation, Field development, SCAL, wettability, and a wide range of EOR techniques including miscible gas (both HC and CO2) injection, low salinity flooding, carbonated water, chemical EOR and hybrid EOR processes. Currently he is actively involved in a number of EOR projects covering screening and design, pilots and commercial scale implementation.
Masalmeh has authored and co-authored more than 90 papers and he holds several patents. Masalmeh is the recipient of the 2015 SPE Regional Reservoir Description and Dynamics Award.
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