Surface charge study of EDTA interaction with carbonate rock during chelating agent flooding

Hassan, Amjed; Al-Hashim, Hasan S.

doi:10.1016/j.petrol.2020.107163

Cited by 30 publications

(25 citation statements)

References 47 publications

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“…In the case of a calcite system with a 1 wt % anhydrite scale, an increase in EDTA solution concentration is observed to improve the negative charge magnitude of the system. This agrees with the report of Hassan and Al-Hashim who reported carbonate system surface charge modification using an EDTA chelating agent. In the cases of 5 and 10 wt % anhydrite concentrations, the optimum EDTA concentration for slug treatment was determined to be 5 wt %.…”

Section: Resultssupporting

confidence: 93%

Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

et al. 2022

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Scale formation and deposition in the subsurface and surface facilities have been recognized as a major cause of flow assurance issues in the oil and gas industry. Sulfate-based scales such as sulfates of calcium (anhydrite and gypsum) and barium (barite) are some of the commonly encountered scales during hydrocarbon production operations. Oilfield scales are a well-known flow assurance problem, which occurs mainly due to the mixing of incompatible brines. Researchers have largely focused on the rocks’ petrophysical property modifications (permeability and porosity damage) caused by scale precipitation and deposition. Little or no attention has been paid to their influence on the surface charge and wettability of calcite minerals. Thus, this study investigates the effect of anhydrite and barite scales’ presence on the calcite mineral surface charge and their propensity to alter the wetting state of calcite minerals. This was achieved vis-à-vis zeta-potential (ζ-potential) measurement. Furthermore, two modes of the scale control (slug and continuous injections) using ethylenediaminetetraacetic acid (EDTA) were examined to determine the optimal control strategy as well as the optimal inhibitor dosage. Results showed that the presence of anhydrite and barite scales in a calcite reservoir affects the colloidal stability of the system, thus posing a threat of precipitation, which would result in permeability and porosity damage. Also, the calcite mineral surface charge is affected by the presence of calcium and barium sulfate scales; however, the magnitude of change in the surface charge via ζ-potential measurement is insignificant to cause wettability alteration by the mineral scales. Slug and continuous injections of EDTA were implemented, with the optimal scale control strategy being the continuous injection of EDTA solutions. The optimal dosage of EDTA for anhydrite scale control is 5 and 1 wt % for the formation water and seawater environments, respectively. In the case of barite, in both environments, an EDTA dosage of 1 wt % suffices. Findings from this study not only further the understanding of the scale effects on calcite mineral systems but also provide critical insights into the potential of scale formation and their mechanisms of interactions for better injection planning and the development of a scale control strategy.

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Section: Resultssupporting

confidence: 93%

Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

et al. 2022

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“…Overall, chelating agents can be injected into carbonate rocks to chelate the ions and induce etched surfaces Equations – represent the reaction between chelating agents and carbonate rocks .…”

Section: Mechanism Of the Chelating Agent Reactionmentioning

confidence: 99%

“…45 Overall, chelating agents can be injected into carbonate rocks to chelate the ions and induce etched surfaces. 47 Equations 7−9 represent the reaction between chelating agents and carbonate rocks. 37 H n Y represents the typical structure of chelating agents, and Y n− is the fully ionized form.…”

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confidence: 99%

Chelating Agents as Acid-Fracturing Fluids: Experimental and Modeling Studies

et al. 2021

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Acid-fracturing operations are applied to improve the productivity of carbonate reservoirs by creating rough fracture surfaces that remain conductive for reservoir fluids after the fracture closure. Different acid types have been used over the history of acid fracturing, including weak organic and strong HCl acids. Organic acids have low dissolving power, generating low fracture conductivity, while HCl acid is corrosive and requires numerous additives. For the first time, this study investigates the performance of the chelating agents, namely, ethylenediaminetetraacetic acid (EDTA) and glutamic acid N,N-diacetic acid (GLDA), in creating sufficient fracture conductivity. Several experiments/measurements were performed, such as coreflooding, fracture conductivity, computed tomography scan imaging, fracture face permeability, scratch test strength, impulse hammer hardness, inductively coupled plasma analysis of effluents, and nuclear magnetic resonance (NMR). The lab-scale outcomes were reproduced numerically, and field-scale simulations were carried. EDTA and GLDA treatments resulted in comparable fracture conductivity outcomes to the HCl acid treatment. However, they were associated with less rock strength reduction, which is essential for long-term sustainable fracture conductivity. The connectivity of the fracture and rock matrix was improved, as concluded from the NMR measurements. The study recommends injecting chelating agents in different cycles separated with soaking periods if higher dissolution/conductivity is desirable. Field-scale simulations showed that EDTA and GLDA chelating agents would result in lower dissolution magnitudes compared to HCl acid. Nevertheless, they could etch 60−70% of the created fracture length compared to 20% etched length created by HCl acid.

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“…The injected chemicals may adsorb on the surface of the reservoir rocks and, hence, lead to alteration in the rock wettability. Also, the injected chemicals could induce some ions leaching from the rock lattice and result in modifying the wettability conditions. − Several techniques are used to evaluate the wettability conditions, such as the contact angle, ζ potential, and spontaneous imbibition. − …”

Section: Chelating Agents As Eor Fluidsmentioning

confidence: 99%

Applications of Chelating Agents in the Upstream Oil and Gas Industry: A Review

et al. 2020

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Chelating agents show very effective performance in different applications in the upstream oil and gas industry. This study presents a critical review of the application of chelating agents in acidizing, scale removal, filter cake removal, wettability alteration, enhanced oil recovery (EOR), and hydraulic fracturing treatments. The advantages and disadvantages of using several types of chelating agents for improving the well/reservoir productivity and enhancing the oil recovery from sandstone and carbonate reservoirs are discussed. Also, detailed comparisons between different chelating agents and their applications in many oil and gas areas are presented. Moreover, the combination of chelating agents with different chemicals to achieve better performance is addressed. Hydroxy amino carboxylic acids [such as ethylenediaminetetraacetic acid (EDTA) and glutamic acid diacetic acid (GLDA)] have replaced conventional acids, such as hydrochloric acid (HCl), hydrofluoric acid (HF), and organic acids, at high temperature and salinity conditions to stimulate carbonate and sandstone reservoirs without any side effects on the formation integrity. Furthermore, diethylenetriaminepentaacetic acid (DTPA) and GLDA are effective in removing different types of scales, such as carbonate, sulfate, and sulfides, without releasing hydrogen sulfide (H 2 S) and using corrosion inhibitors. Also, DTPA, EDTA, and GLDA are very active in dissolving filter cake layers formed by different drilling fluids. Aminopolycarboxylic groups can be injected into sandstone and carbonate reservoirs to adjust the wettability conditions and enhance oil recovery. Chelating agents, such as GLDA, EDTA, and DTPA, optimize the fracture conductivity and, meanwhile, minimize the number of additives in hydraulic fracturing, which significantly cut the cost of the operation. Overall, chelating agents are economically attractive chemicals for various upstream operations since produced, and seawater can be used without further treatment.

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Surface charge study of EDTA interaction with carbonate rock during chelating agent flooding

Cited by 30 publications

References 47 publications

Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

Chelating Agents as Acid-Fracturing Fluids: Experimental and Modeling Studies

Applications of Chelating Agents in the Upstream Oil and Gas Industry: A Review

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