Evaluation of Alcohol-Based Treatments for Condensate Banking Removal Guillermo A. Alzate; Guillermo A. Alzate U. Nacional de Colombia Search for other works by this author on: This Site Google Scholar Carlos Alberto Franco; Carlos Alberto Franco BP Amoco Colombia Search for other works by this author on: This Site Google Scholar Alejandro Restrepo; Alejandro Restrepo BP Exploration Colombia Ltd. Search for other works by this author on: This Site Google Scholar Jessica J. Del Pino Castrillon; Jessica J. Del Pino Castrillon Search for other works by this author on: This Site Google Scholar Diogenes Laureano Barreto Alvares; Diogenes Laureano Barreto Alvares Search for other works by this author on: This Site Google Scholar Alfaro Alberti Escobar Murillo Alfaro Alberti Escobar Murillo Search for other works by this author on: This Site Google Scholar Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, Lafayette, Louisiana, USA, February 2006. Paper Number: SPE-98359-MS https://doi.org/10.2118/98359-MS Published: February 15 2006 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Alzate, Guillermo A., Franco, Carlos Alberto, Restrepo, Alejandro, Del Pino Castrillon, Jessica J., Barreto Alvares, Diogenes Laureano, and Alfaro Alberti Escobar Murillo. "Evaluation of Alcohol-Based Treatments for Condensate Banking Removal." Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, Lafayette, Louisiana, USA, February 2006. doi: https://doi.org/10.2118/98359-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Conference and Exhibition on Formation Damage Control Search Advanced Search AbstractThe use of stimulation treatments based on alcohol to remove liquid blockage or condensate banking in the near well zone date from sixties. Among the proposed mechanisms to explain the enhancement in gas effective permeability and also the higher degree of cleaning and liquid removal obtained in laboratory and field studies, are interfacial tension reduction and the miscibility characteristics reached between the treatment fluids and the formation fluids.This paper presents the results for compatibility and displacement tests carried out among reservoir fluids, alcohol and inhibited diesel based treatments and formation cores from main Cupiagua field. These tests are focused about the behavior of these treatments when they are applied in core flooding tests to reduce liquid saturation and also to increase the gas effective saturation in a porous media. The offered results can be interpreted as a preliminary sight about the use of these treatments on lab scale before applying them as stimulation fluids on a field project.The study consists in assess the alcohol-based and inhibited diesel treatments' efficiency through the gas effective permeability before and after of the treatment injection into a core. The objective was focused to study the use of alcohol and inhibited diesel to remove formation damage by liquid blockage and their application in condensate gas reservoirs.The alcohol-based treatments show consistent results about their effectiveness both on core tests carried on Mirador formation, Cupiagua Main Field - Colombia, and Berea sandstone. In general, the results show up an increase on the gas effective permeability, the lower the core permeability the higher the gas effective permeability enhancement reached after the treatment. The alcohol labeled 21-NE-06 and inhibited diesel treatments increase the gas effective permeability both in Berea and Mirador cores. Both Alcohol 21-NE-06 and inhibited diesel based treatments are effective for removing liquid phases that cause a liquid blockage to gas flow. The stimulation degree is higher in Mirador than in Berea cores. Some treatments did not show any stimulation degree, instead, they generate additional gas effective permeability impairment.IntroductionThe reservoirs of condensate gas had been subject of study with emphasis in last years because the growing participation of this kind of hydrocarbons in new reserves. Gas condensate reservoirs as a result of fluids' production process and related with the production rate magnitude diminish their pressure below the dew point pressure. This situation is more evident at near production wells' zone, where due to the reduction of radial gas flow area produces an additional pressure drop. Gas condensate reservoirs are very prompted to show up formation damage at the near well zone. [1–6] If the fluid flowing pressure is below of dew pressure, liquid drop-out accumulations would present in the reservoir, and in a higher degree near to the producing wells. It results in an increasing on reservoir liquid saturation what is called as formation damage by liquid blockage. This liquid blockage remains due to capillary forces and also due to the high gas-liquid mobility ratio.Some authors propose the existence of three flow's regions on gas condensate reservoirs, which appears sequentially or simultaneously along production time depending of pressure profile. When the flow pressure is higher than dew pressure, only exists gas flow. This region exists in any point of the reservoir where this condition is met, but its existence is evident at early production times. When the reservoir pressure drops below dew point pressure, fluid condensation results in the formation of liquid banking. In this region and at early time during liquid condensation process only exists gas flow due to temporal immobility of liquid. Near zone to producer's wells, where the pressure drop is higher and also when the condensation process last for longer times, the liquid saturation achieves mobility levels and then simultaneous flow of gas and condensate exists, Figure 1. Keywords: flow in porous media, enhanced recovery, stimulation degree, condensate reservoir, diesel treatment, permeability, Fluid Dynamics, Berea core, saturation, reservoir Subjects: Reservoir Fluid Dynamics, Improved and Enhanced Recovery, Flow in porous media This content is only available via PDF. 2006. Society of Petroleum Engineers You can access this article if you purchase or spend a download.