Study On Admixtures For Calcium Aluminate Phosphate Cement Useful To Seal CCS Wells

Abstract

Study On Admixtures For Calcium Aluminate Phosphate Cement Useful To Seal CCS Wells F.. Dugonjic-Bilic; F.. Dugonjic-Bilic Technische Universitaet Muenchen Search for other works by this author on: This Site Google Scholar C.. Tiemeyer; C.. Tiemeyer Technische Universitaet Muenchen Search for other works by this author on: This Site Google Scholar J.. Plank J.. Plank Technische Universitaet Muenchen Search for other works by this author on: This Site Google Scholar Paper presented at the SPE International Symposium on Oilfield Chemistry, The Woodlands, Texas, USA, April 2011. Paper Number: SPE-141179-MS https://doi.org/10.2118/141179-MS Published: April 11 2011 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Dugonjic-Bilic, F.. , Tiemeyer, C.. , and J.. Plank. "Study On Admixtures For Calcium Aluminate Phosphate Cement Useful To Seal CCS Wells." Paper presented at the SPE International Symposium on Oilfield Chemistry, The Woodlands, Texas, USA, April 2011. doi: https://doi.org/10.2118/141179-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 on Oilfield Chemistry Search Advanced Search Abstract Conventional Portland cement is known to degrade under the attack of CO2. The failure is caused by formation of CaCO3 which in the presence of wet CO2 can leach as calcium bicarbonate Ca(HCO3)2. This way, channels for further ingress and migration of carbon dioxide are created. Recently, a new binder system based on calcium aluminate phosphate cement has been developed which exhibits outstanding CO2 resistance and temperature stability up to 320 °C. Main limitation of this novel binder system is a lack of additives to retard and control the water loss from the aqueous slurry.In our study, we first present an effective retarding admixture for this cement. Comparison of four different retarders (boric acid, tartaric acid, calcium lignosulfonate and butylene triamine pentamethylene phosphonic acid) revealed that only a combination of boric and tartaric acid at the specific ratio of 2.7:1 (wt./wt.) retards hydration of this cement long enough to guarantee a pumpability time of over 6 h at a pressure of 200 bars and a temperature of 80 °C.Testing of numerous fluid loss additives showed that conventional admixtures based on polyvinyl alcohol, cellulose ether or polyethylene imine do not prevent water loss. This lead to the conclusion that neither film forming additives nor synthetic polymers which physically plug cement filtercake pores will work sufficiently in this specific cement system. Thus, polymers which control fluid loss by adsorption within the pores of the filtercake were probed. This approach proved to be successful. Application of a fluid loss additive based on acrylamide tert-butylsulfonate (ATBS) produced excellent fluid loss control, even at 80 °C. The mechanism behind this performance was found to be reduction of filter cake permeability by adsorption of the high molecular weight polymer onto the positively charged surfaces of cement hydrate phases. Interaction of this admixture with the binder and its working mechanism are presented in detail. Keywords: drilling fluid chemistry, drilling fluid property, casing and cementing, adsorption, drilling fluid selection and formulation, drilling fluid formulation, polymer, cement property, drilling fluids and materials, upstream oil & gas Subjects: Drilling Fluids and Materials, Casing and Cementing, Drilling fluid selection and formulation (chemistry, properties), Cement formulation (chemistry, properties) Copyright 2011, Society of Petroleum Engineers You can access this article if you purchase or spend a download.