A systematic approach for reducing scaling effects and enhancing production in depleted carbonate reservoirs

Speaker: Tasos Boulis, Sr. Reservoir Engineer, Occidental Oil & Gas
Speaker Tasos Boulis, Sr. Reservoir Engineer, Occidental Oil & Gas
Tasos Boulis is a Sr. Reservoir Engineer with Occidental Oil & Gas and the North New Mexico asset team. He has 10 years of experience, focusing on unconventional resources, reservoir management and production optimization. Before joining OXY in 2014, he was working for Weatherford International as a Reservoir Engineering consultant, ...

Tasos Boulis is a Sr. Reservoir Engineer with Occidental Oil & Gas and the North New Mexico asset team. He has 10 years of experience, focusing on unconventional resources, reservoir management and production optimization. Before joining OXY in 2014, he was working for Weatherford International as a Reservoir Engineering consultant, where he had the opportunity to work on most of the major unconventional plays in North America and worldwide. Tasos has been a SPE member since 2007 and has authored many SPE papers and articles. He holds a MSc. in Petroleum Engineering from Texas A&M University and a BSc. in Drilling & Mining Engineering from the National Technical University of Athens.

Full Description

Scaling mainly in the form of CaCO3 and/or Fe2S has been a major issue for almost all of OXY’s vertical and horizontal wells in the North New Mexico area and the Yeso formation (carbonates). In the past scaling squeezes with scale inhibitors have given inconsistent results in mitigating scale deposition. Several wells need to be treated regularly to maintain their productivity and the associated costs are significant. Additionally, the evidence of paraffin problems and potentially perforation/fracture closure due to gel residues created the need of a new, more efficient approach that can drastically target these problems.

The OXY North New Mexico asset team, has developed a new methodology which has successfully been applied in more than 20 vertical wells. The new procedure consists of a combination of chemicals and acid treatments that can significantly reduce the scaling and recover the productivity of the wells. The results over the past 1.5 years are very encouraging and the treated wells showed an average incremental oil rate increase of 630% while the projects are paying out within the first month of production after treatment.

 

Organizer Amy Timmons