EDTA chelating agent/seawater solution as enhanced oil recovery fluid for sandstone reservoirs

Mahmoud, Mohamed; Attia, Mohamed; Al-Hashim, Hasan S.

doi:10.1016/j.petrol.2017.03.019

Cited by 37 publications

(26 citation statements)

References 22 publications

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“…Chelating agents were injected into the reservoir to adjust the wettability conditions. , The reaction between chelating agents and carbonate rocks was represented by eqs –. , H n Y represents the typical structure of the chelating agents. In aqueous solutions, chelating agents reach to the ionized form (Y n – ) by losing protons (H + ) stepwise, as represented by eq .…”

Section: Chelating Agents As Eor Fluidsmentioning

confidence: 99%

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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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Section: Chelating Agents As Eor Fluidsmentioning

confidence: 99%

“…The effect of solution pH on the oil recovery during chelating agent flooding was investigated for sandstone rocks . The increase of oil recovery by ∼31% was reported with 5 wt % EDTA at a pH of 12.2, but only 5.3% oil recovery was obtained when using the same fluid at a pH of 10.7.…”

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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“…Ethylenediaminetetraacetic acid (EDTA) is an aminopolycarboxylic acid and a water-soluble solid, which in processes and synthesis forms a complex precursor for a low-temperature synthesis of cathodic materials. e chelating agents can be defined as chemical compounds that chelate metal ions, such as calcium, magnesium, and iron, and can form complex compounds [13], and the main reason for using EDTA as a chelating agent is its ability to chelate the multivalent cations, which represents the stability in the binding strength between the chelate and the metal ion (cation), i.e., the higher the value is, the more stable the compound is, and the high stability means high affinity of the chelating agent to this cation [13].…”

Section: Introductionmentioning

confidence: 99%

“…It is possible to find in the literature studies involving EDTA as a chelating agent, such as the work of Mahmoud et al [13], where an improved EDTA/seawater system for oil recovery was introduced in sandstone tanks. Improved oil recovery fluid utilizing EDTA/seawater presents high pH low-level chelating agents when prepared in seawater, which present in intermediate layers at the rock/brine and brine/oil interfaces without affecting the integrity of the rock and dissolving the carbonated minerals [14].…”

Section: Introductionmentioning

confidence: 99%

Chelating Effect of Cellulose Acetate Hydrogel Crosslinked with EDTA Dianhydride Used as a Platform for Cell Growth

Melero

Senna

Domingues

et al. 2019

Advances in Materials Science and Engineering

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The use of biomaterials capable of achieving controlled release of drugs or chemical and physical interactions with living organisms causes these new materials to be studied in depth to better target their future applications. An example of this is the use of materials that have in their physical structure elements with chelating effects, capable of interacting with the ions and cations present in the cell culture media, drugs, and other elements capable of interacting with the human body. In this work, cellulose acetate hydrogel (HAC) crosslinked with EDTAD (ethylenediaminetetraacetic acid dianhydride) showed a significant chelating effect capable of altering the adhesion of mesenchymal cells in the first days of in vitro tests. This result became our main question in this work, and by using new cell viability assays, it was verified that the hydrogel interacted with the culture medium, removed the salts present, such as Ca2+ and Mg2+, and promoted a decrease in the amount of cells adhered to the material but not cell death. After saturation of Ca2+ and Mg2+, we obtained an improvement in cell adhesion. Electrochemical impedance spectroscopy (EIS) results also verified the dynamics of linked or mobile loads in the volume and interface regions of HAC-EDTA and the presence of characteristic bands related to the interaction between calcium and magnesium present in the culture medium with HAC-EDTA. The DMA traction test showed that there was no dynamic-mechanical change in the structure of the material at temperatures between 20 and 60°C, which is ideal for this studied biomaterial. The purpose of these tests is to aid in the characterization of future biomaterials, where the physicochemical interaction of some of them is often confused with a false cytotoxicity, which in fact may only be an easily identifiable and adaptable structural feature.

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“…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. During chelating agent injection, the ionized form of the chelating agent will chelate the calcium ions from the carbonate rocks (eq 8).…”

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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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EDTA chelating agent/seawater solution as enhanced oil recovery fluid for sandstone reservoirs

Cited by 37 publications

References 22 publications

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

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

Chelating Effect of Cellulose Acetate Hydrogel Crosslinked with EDTA Dianhydride Used as a Platform for Cell Growth

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

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