The Effect of Spent Acid on Carbonate Rock Wettability

Abstract

The Effect of Spent Acid on Carbonate Rock Wettability M.. Saneifar; M.. Saneifar Texas A&M University Search for other works by this author on: This Site Google Scholar M. M. Fahes; M. M. Fahes Texas A&M University Search for other works by this author on: This Site Google Scholar R. L. Hosein; R. L. Hosein Texas A&M University Search for other works by this author on: This Site Google Scholar B. O. Hassna; B. O. Hassna Texas A&M University Search for other works by this author on: This Site Google Scholar A. D. Hill A. D. Hill Texas A&M University Search for other works by this author on: This Site Google Scholar Paper presented at the Trinidad and Tobago Energy Resources Conference, Port of Spain, Trinidad, June 2010. Paper Number: SPE-133166-MS https://doi.org/10.2118/133166-MS Published: June 27 2010 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Saneifar, M.. , Fahes, M. M., Hosein, R. L., Hassna, B. O., and A. D. Hill. "The Effect of Spent Acid on Carbonate Rock Wettability." Paper presented at the Trinidad and Tobago Energy Resources Conference, Port of Spain, Trinidad, June 2010. doi: https://doi.org/10.2118/133166-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Trinidad and Tobago Section Energy Resources Conference Search Advanced Search Abstract This is an experimental study aimed at improving the recovery of spent acid in carbonate gas reservoirs. When acidizing, the spent acid penetrates deeper into the formation beyond the stimulated zone. The spent acid needs to be removed in order to restore the permeability to gas and enhance well performance. One of the most important factors that control spent acid recovery is rock wettability. In this study, we investigate the changes in the wettability of carbonate rocks when invaded by spent acid experimentally. These changes in the wettability are due to the various additives that are added to the acid treatment.In this paper, we explain quantitatively the effect of wettability on spent acid recovery and we present experimental results on the effect of spent acid on carbonate rock wettability.Our results show that carbonate rocks are not strongly water-wet; spent acid (HCl) by itself does not change wettability of the rock; some commonly used additives can change the wettability of the rock either towards stronger water-wetting or less water-wetting.To the best of our knowledge, there is no published data on the effect of spent acid on rock wettability and how that relates to the rate of recovery and its ultimate value. Keywords: saturation, imbibition, water imbibition, relative permeability, permeability, recovery, irreducible water saturation, fluid dynamics, carbonate rock, wettability Subjects: Reservoir Fluid Dynamics, Formation Evaluation & Management, Unconventional and Complex Reservoirs, Flow in porous media, Carbonate reservoirs Copyright 2010, Society of Petroleum Engineers You can access this article if you purchase or spend a download.