Acid treatment of carbonate deposits at the Perm Region oil fields

• Main Authors: Vladimir A. Novikov, Dmitry A. Martyushev
• Format: Article
• Language: English
• Published: Perm National Research Polytechnic University 2020-03-01
• Series: Perm Journal of Petroleum and Mining Engineering
• Subjects: acid treatment; carbonate reservoir; hydrochloric acid; acid composition; perm region fields; acid treatment efficiency; x-ray tomography; void structure; carbonate content; insoluble residue; successful acid treatments; hydrodynamic research; productivity index; bottomhole zone permeability; farfield zone permeability
• Online Access: http://vestnik.pstu.ru/get/_res/fs/file2.pdf/9147/Acid+treatment+of+carbonate+deposits+at+the+Perm+Region+oil+fieldsfile2.pdf

Acid treatments are among the most common methods to enhance deliverability of productive wells running on carbonate deposits. Such treatment at the oil fields of OOO LUKOIL-Perm, which are conventionally divided into the Southern, Northern and Nozhovskaya groups depending on their location in the the Perm Region, is complicated by the particular features of the deposit geology, difference in the mineralogical composition of rocks, and properties of formation fluids. To determine the optimal formulation for acid treatment of carbonate deposits for each group of fields, the field application of three most used compositions: DN-9010, FLUXOCORE-210 and NPS-K, was reviewed. During the research, the particular features of the reservoir void structure were studied using X-ray tomography, the mineralogical composition of rocks was determined using KM-04M carbonate metering device, the proportion of successful treatment jobs with each of the acid composition was identified and their efficiency was assessed based on changes in well productivity and the reservoir flow parameters after treatments, obtained from the interpretation of hydrodynamic research data. As a result of the field data analysis, it was established that the number of jobs resulting in the target oil production growth using FLUXOCORE-210 and NPS-K compositions in carbonate sediments of the Southern, Northern and Nozhovskaya oil field groups slightly exceeded the number of successful acid treatments using DN-9010 composition, which was confirmed by hydrodynamic research data where the highest efficiency of NPS-K and FLUXOCORE -210 was identified in comparison with DN-9010. The highest efficiency of NPS-K acid composition was observed at carbonate deposits of Southern and Nozhovskaya groups of fields, while FLUXOCORE -210 showed the best results in the deposits of Northern group of fields.