Stimulating illitic sandstone reservoirs using in-situ generated HF with the aid of thermochemicals

Gomaa, Ibrahim; Mahmoud, Mohamed

doi:10.1016/j.petrol.2020.107089

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…This was due to the creation of etched surfaces during thermochemical fracturing. Gomaa et al [ 17 , 18 ] found similar results in terms of permeability improvement in different sandstone rocks with a variety of clay contents.…”

Section: Introductionmentioning

confidence: 74%

Mass and Heat Transfer of Thermochemical Fluids in a Fractured Porous Medium

2020

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The desire to improve hydraulic fracture complexity has encouraged the use of thermochemical additives with fracturing fluids. These chemicals generate tremendous heat and pressure pulses upon reaction. This study developed a model of thermochemical fluids’ advection-reactive transport in hydraulic fractures to better understand thermochemical fluids’ penetration length and heat propagation distance along the fracture and into the surrounding porous media. These results will help optimize the design of this type of treatment. The model consists of an integrated wellbore, fracture, and reservoir mass and heat transfer models. The wellbore model estimated the fracture fluid temperature at the subsurface injection interval. The integrated model showed that in most cases the thermochemical fluids were consumed within a short distance from the wellbore. However, the heat of reaction propagated a much deeper distance along the hydraulic fracture. In most scenarios, the thermochemical fluids were consumed within 15 ft from the fracture inlet. Among other design parameters, the thermochemical fluid concentration is the most significant in controlling the penetration length, temperature, and pressure response. The model showed that a temperature increase from 280 to 600 °F is possible by increasing the thermochemical concentration. Additionally, acid can be used to trigger the reaction but results in a shorter penetration length and higher temperature response.

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Section: Introductionmentioning

confidence: 74%

Mass and Heat Transfer of Thermochemical Fluids in a Fractured Porous Medium

2020

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“…Figures 1 and 2 show the surface morphologies of all the clay samples, as acquired from the SEM. The surface of all the clay samples look like a flake [33]. This is a unique characteristic of clay materials [24].…”

Section: Characterization Results Of the Local Clay Samplesmentioning

confidence: 99%

Thermochemical Treatment of Nigerian Raw Clays for Oil and Gas Drilling Operations

Ogolo,

Arinkoola,

Ngene

et al. 2023

ChemEngineering

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Sodium-based bentonite is used for drilling operations because of its high swelling capacity. This type of bentonite clay is not sourced locally in many oil- and gas-producing nations. However, low-swelling clays (calcium- and potassium-based) are in abundant quantities in most of these countries. Hence, there is a need to convert low-swelling bentonite clays to sodium-based bentonite. The method used to convert low-swelling clays is more applicable to calcium-based bentonite. This research investigated a thermochemical treatment method that converted potassium-based bentonite to sodium-based bentonite. The raw clay materials were sourced from Pindinga (P) and Ubakala (U) clay deposits in Nigeria. An X-ray diffractometer (XRD), an energy dispersive X-ray (EDX), and a scanning electron microscope (SEM) were used to characterize the raw clay samples. Mud slurry was prepared by mixing 22 g of the local raw clays, 3 wt.% soda ash, and MgO at concentrations between 1 and 3 wt.% and heating at 90 °C. The result showed that the viscosities of samples P and U increased from 6 to 26 and 8 to 35.5 cP before and after thermochemical treatment, respectively. Also, due to the thermochemical treatment, the samples’ yield point, consistency factor, consistency index, and thixotropy behavior were all significantly improved.

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“…From the aspect of improving treatment procedures, a single-stage sandstone acidizing is developed to reduce HCl requirements, the treatment complexity and the overall treatment rig time (Gomaa et al 2015). The conventional acidizing procedure mainly includes three main steps: preflush, main acid stage and after-flush (Gidley et al 1996;Sutton et al 1972). In single-stage sandstone acidizing, the acid system is injected into formations in one step instead of three steps.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of one-step economical retarded sandstone acid

Yang

2021

J Petrol Explor Prod Technol

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The objective of this study is to experimentally evaluate a new acid combination of HEDP: CH3COOH as a retarded acid to minimize some limitations of high-temperature sandstone acidizing, such as fast acid-rock reaction and secondary precipitation pipeline corrosion. In this work, the acid–base titration, core-powder solubility test, scale deposition test, corrosion rate measurement and corefloods were carried out to evaluate the performances of the acid combination, including acidity characteristics, retarded performance, preventing scale rate, corrosivity and improving permeability. And then the microstructure and mineral content in sandstone samples were observed and analyzed with SEM–EDS. The results of evaluation tests indicated that the new acid combination has excellent performances on retarded rate, preventing scale deposition, permeability enhancement and lower corrosivity, comparing with conventional mud acid. The results of SEM and EDS showed that the microstructure and mineral content of sandstone changed after acid treatment. Compared with mud acid, the new acid system can react more with small particles on sandstone surface and less with the skeleton of samples and the decrease in the contents of Mg, Al, Na, K, Ca and Fe is relatively lower.

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Stimulating illitic sandstone reservoirs using in-situ generated HF with the aid of thermochemicals

Cited by 12 publications

References 19 publications

Mass and Heat Transfer of Thermochemical Fluids in a Fractured Porous Medium

Mass and Heat Transfer of Thermochemical Fluids in a Fractured Porous Medium

Thermochemical Treatment of Nigerian Raw Clays for Oil and Gas Drilling Operations

Experimental study of one-step economical retarded sandstone acid

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