Stimulation of Multilayered High-Carbonate-Content Sandstone Formations in West Africa Using Chelant-Based Fluids and Mechanical Diversion

Parkinson, Mark; Munk, Trevor Kenneth; Brookley, J.; Caetano, Agostinho Domingos; Albuquerque, Marcos Antonio; Cohen, David D.; Reekie, Michael Robert

doi:10.2118/128043-ms

Cited by 19 publications

(5 citation statements)

References 5 publications

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“…Among these problems: decomposition of clays in HCl acids, precipitation of fluosilicates, the presence of carbonate can cause the precipitation of aluminum fluorides, silica-gel filming, colloidal silica-gel precipitation, and mixing between various stages of the treatment (Gdanski and Shuchart 1998). Parkinson et al (2010) used Na 3 HEDTA at pH 4 to stimulate Berea sandstone cores and the results compared with mud acid (9 wt% HCl + 1 wt% HF). The results showed that Na 3 HEDTA was more effective in stimulating Berea core than mud acid and HCl.…”

Section: Introductionmentioning

confidence: 99%

Novel Environmentally Friendly Fluids to Remove Carbonate Minerals from Deep Sandstone Formations

2011

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Carbonate minerals are present in sandstone formations. These minerals are either introduced to the formation during drilling/completion operations or naturally present in the rock. There is a need to remove these carbonates to enhance well performance. This especially true if there is a need to use HF-based fluids to prevent the precipitation of calcium and magnesium fluorides.In this study, we introduced GLDA (L-glutamic acid-N,N-diaceticacid) a new environmentally friendly chelate to remove carbonate minerals from sandstone formations. We also compared its performance with available chelates like EDTA (ethylenediaminetetraaceticacid) and HEDTA (hydroxyethylenediaminetriaceticacid). Berea (5 wt% clays) and Bandera (11 wt% clays) sandstone cores were used in the coreflood experiments. The concentration of the chelates used was 0.6M at pH values of 11 and 4. The coreflood experiments were run at a flow rate of 5 cm 3 /min and 300 o F.Coreflood experiments showed that at high pH values (pH =11) GLDA, HEDTA, and EDTA were almost the same in increasing the permeability of both Berea and Bandera sandstone cores. GLDA, HEDTA, and EDTA were compatible with Bandera sandstone cores. The weight loss from the core was highest in case of HEDTA and lowest in case of GLDA at pH 11. At pH 4, 0.6M-GLDA performed better than 0.6M HEDTA in the coreflood experiments. The permeability ratio (final/initial) for Bandera sandstone cores was 2 in the case of GLDA and 1.2 in the case of HEDTA at pH of 4, and 300 o F. At pH 11, HEDTA, EDTA, and GLDA almost were the same in enhancing the permeability of the Bandera sandstone cores. At pH value of 4, GLDA gave the best results in Berea and Bandera sandstone cores.

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Section: Introductionmentioning

confidence: 99%

Novel Environmentally Friendly Fluids to Remove Carbonate Minerals from Deep Sandstone Formations

2011

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“…Chelating agents, such as HEDTA, were used in sandstone stimulation because of the ability to remove cations, such as aluminum, ferric, calcium, magnesium, etc. HEDTA showed very good potential in stimulating high-temperature sandstone formation with a high carbonate content compared to the mud acid. , In addition to the stimulation of sandstone, HEDTA removed the scale from the well and reservoir. Less additives were required in comparison to HCl treatments.…”

Section: Applications Of Chelating Agents In Stimulationmentioning

confidence: 99%

“…HEDTA showed very good potential in stimulating high-temperature sandstone formation with a high carbonate content compared to the mud acid. 44,45 In addition to the stimulation of sandstone, HEDTA removed the scale from the well and reservoir. Less additives were required in comparison to HCl treatments.…”

Section: Applications Of Chelating Agents In Stimulationmentioning

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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“…The result indicated that the chelating fluid is efficient in increasing the permeability of the high-temperature well. Moreover, Parkinson et al (2010) also applied an alternative approach to stimulate the production zone of Pinda formation that is located in West Africa. The Pinda formation was having multilayers of carbonates.…”

Section: Chelating Agentsmentioning

confidence: 99%

A preliminary screening and characterization of suitable acids for sandstone matrix acidizing technique: a comprehensive review

Leong

Mahmud

2018

J Petrol Explor Prod Technol

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Matrix acidizing is a broadly developed technique in sandstone stimulation to improve the permeability and porosity of a bottom-hole well. The most popular acid used is mud acid (HF-HCl). It is a mixture of hydrofluoric acid and hydrochloric acid. However, one of the conventional problems in sandstone acidizing is that mud acid faces significant issues at high temperature such as rapid rate of reaction, resulting in early acid consumption. This downside has given a negative impact to sandstone acidizing as it will result in not only permeability reduction, but can even extend to acid treatment failure. So, the aim of this study is to provide a preliminary screening and comparison of different acids based on the literature to optimize the acid selection, and targeting various temperatures of sandstone environment. This paper has comprehensively reviewed the experimental works using different acids to understand the chemical reactions and transport properties of acid in sandstone environment. The results obtained indicated that fluoroboric acid (HBF 4) could be useful in enhancing the sandstone acidizing process, although more studies are still required to consolidate this conclusion. HBF 4 is well known as a low damaging acid for sandstone acidizing due to its slow hydrolytic reaction to produce HF. This would allow deeper penetration of the acid into the sandstone formation at a slower rate, resulting in higher porosity and permeability enhancement. Nevertheless, little is known about the effective temperature working range for a successful treatment. Considering the pros and cons of different acids, particularly those which are associated with HF and HBF 4 , it is recommended to perform a comprehensive analysis to determine the optimum temperature range and effective working window for sandstone acidizing before treatment operation. Prior to sandstone acid stimulation, it is essential to predict the feasibility of acid selected by integrating the effects of temperature, acid concentration and injection rate. Therefore, this manuscript has thrown light into the research significance of further studies.

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Stimulation of Multilayered High-Carbonate-Content Sandstone Formations in West Africa Using Chelant-Based Fluids and Mechanical Diversion

Cited by 19 publications

References 5 publications

Novel Environmentally Friendly Fluids to Remove Carbonate Minerals from Deep Sandstone Formations

Novel Environmentally Friendly Fluids to Remove Carbonate Minerals from Deep Sandstone Formations

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

A preliminary screening and characterization of suitable acids for sandstone matrix acidizing technique: a comprehensive review

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