Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines

Abstract Most fractured carbonate oil reservoirs have oil-wet rocks. Therefore, the process of imbibing water from the fractures into the matrix is usually poor or basically does not exist due to negative capillary pressure. To achieve appropriate ultimate oil recovery in these reservoirs, a water-b...

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Autores principales:	Ehsan Ghandi, Rafat Parsaei, Masoud Riazi
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Spontaneous imbibition Carbonated smart water Wettability alteration Enhanced oil recovery Dolomite rocks Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/2b863063c17c4ba3ab95f69d097592f9
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spelling	oai:doaj.org-article:2b863063c17c4ba3ab95f69d097592f92021-12-02T10:43:29ZEnhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines10.1007/s12182-019-0355-11672-51071995-8226https://doaj.org/article/2b863063c17c4ba3ab95f69d097592f92019-07-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-019-0355-1https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Most fractured carbonate oil reservoirs have oil-wet rocks. Therefore, the process of imbibing water from the fractures into the matrix is usually poor or basically does not exist due to negative capillary pressure. To achieve appropriate ultimate oil recovery in these reservoirs, a water-based enhanced oil recovery method must be capable of altering the wettability of matrix blocks. Previous studies showed that carbonated water can alter wettability of carbonate oil-wet rocks toward less oil-wet or neutral wettability conditions, but the degree of modification is not high enough to allow water to imbibe spontaneously into the matrix blocks at an effective rate. In this study, we manipulated carbonated brine chemistry to enhance its wettability alteration features and hence to improve water imbibition rate and ultimate oil recovery upon spontaneous imbibition in dolomite rocks. First, the contact angle and interfacial tension (IFT) of brine/crude oil systems were measured for several synthetic brine samples with different compositions. Thereafter, two solutions with a significant difference in WAI (wettability alteration index) but approximately equal brine/oil IFT were chosen for spontaneous imbibition experiments. In the next step, spontaneous imbibition experiments at ambient and high pressures were conducted to evaluate the ability of carbonated smart water in enhancing the spontaneous imbibition rate and ultimate oil recovery in dolomite rocks. Experimental results showed that an appropriate adjustment of the imbibition brine (i.e., carbonated smart water) chemistry improves imbibition rate of carbonated water in oil-wet dolomite rocks as well as the ultimate oil recovery.Ehsan GhandiRafat ParsaeiMasoud RiaziKeAi Communications Co., Ltd.articleSpontaneous imbibitionCarbonated smart waterWettability alterationEnhanced oil recoveryDolomite rocksScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 6, Pp 1361-1373 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Spontaneous imbibition Carbonated smart water Wettability alteration Enhanced oil recovery Dolomite rocks Science Q Petrology QE420-499
spellingShingle	Spontaneous imbibition Carbonated smart water Wettability alteration Enhanced oil recovery Dolomite rocks Science Q Petrology QE420-499 Ehsan Ghandi Rafat Parsaei Masoud Riazi Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines
description	Abstract Most fractured carbonate oil reservoirs have oil-wet rocks. Therefore, the process of imbibing water from the fractures into the matrix is usually poor or basically does not exist due to negative capillary pressure. To achieve appropriate ultimate oil recovery in these reservoirs, a water-based enhanced oil recovery method must be capable of altering the wettability of matrix blocks. Previous studies showed that carbonated water can alter wettability of carbonate oil-wet rocks toward less oil-wet or neutral wettability conditions, but the degree of modification is not high enough to allow water to imbibe spontaneously into the matrix blocks at an effective rate. In this study, we manipulated carbonated brine chemistry to enhance its wettability alteration features and hence to improve water imbibition rate and ultimate oil recovery upon spontaneous imbibition in dolomite rocks. First, the contact angle and interfacial tension (IFT) of brine/crude oil systems were measured for several synthetic brine samples with different compositions. Thereafter, two solutions with a significant difference in WAI (wettability alteration index) but approximately equal brine/oil IFT were chosen for spontaneous imbibition experiments. In the next step, spontaneous imbibition experiments at ambient and high pressures were conducted to evaluate the ability of carbonated smart water in enhancing the spontaneous imbibition rate and ultimate oil recovery in dolomite rocks. Experimental results showed that an appropriate adjustment of the imbibition brine (i.e., carbonated smart water) chemistry improves imbibition rate of carbonated water in oil-wet dolomite rocks as well as the ultimate oil recovery.
format	article
author	Ehsan Ghandi Rafat Parsaei Masoud Riazi
author_facet	Ehsan Ghandi Rafat Parsaei Masoud Riazi
author_sort	Ehsan Ghandi
title	Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines
title_short	Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines
title_full	Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines
title_fullStr	Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines
title_full_unstemmed	Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines
title_sort	enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/2b863063c17c4ba3ab95f69d097592f9
work_keys_str_mv	AT ehsanghandi enhancingthespontaneousimbibitionrateofwaterinoilwetdolomiterocksthroughboostingawettabilityalterationprocessusingcarbonatedsmartbrines AT rafatparsaei enhancingthespontaneousimbibitionrateofwaterinoilwetdolomiterocksthroughboostingawettabilityalterationprocessusingcarbonatedsmartbrines AT masoudriazi enhancingthespontaneousimbibitionrateofwaterinoilwetdolomiterocksthroughboostingawettabilityalterationprocessusingcarbonatedsmartbrines
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Enhancing the spontaneous imbibition rate of water in oil-wet dolomite rocks through boosting a wettability alteration process using carbonated smart brines

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