Investigation of the Mechanism and Effect of Citric Acid-Based Deep Eutectic Solvents Inhibiting Hydration and Expansion of Gas Shale Clay Minerals

Bai, Jiajia; Xiao, Fengchao; Chen, Zhaowei; Tao, Lei; Zhang, Na; Shi, Wenyang; Zhu, Quanyin

doi:10.1021/acs.energyfuels.2c03819

Cited by 13 publications

(8 citation statements)

References 50 publications

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“…The efficient gelled acid used in the experiments mainly consists of 20% hydrochloric acid, 0.8% high-effective thickener, 5% corrosion inhibitor, 2% iron stabilizer, and 1% clay stabilizer, which is added based on the formation features of the Sichuan Basin. , Specifically, the high-effective thickener is mainly polymerized by DMC and an allyl octadecyl trimethyl ammonium bromide monomer and a very small amount of diallyl polyethylene glycol. The main experimental materials and facilities are shown in Table .…”

Section: Property Evaluation Experiments Materials and Facilitiesmentioning

confidence: 99%

Evaluation and Application of Efficient Gelled Acid for Carbonate Formation Fracturing

Zhao¹,

Zhang³

et al. 2023

ACS Omega

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In the middle and west of Sichuan Basin, the targeted carbonate formation exhibits features of deep burial and high temperatures at present. In order to obtain better acid fracturing results, the efficient gelled acid developed was investigated based on the carbonate formation characteristics. At the same time, the field application was conducted to prove its adaptability and effectiveness. The high-effective thickener is mainly polymerized by DMC and an allyl octadecyl trimethyl ammonium bromide monomer and a very small amount of diallyl polyethylene glycol. The efficient gelled acid has good compatibility with carbonate formation and formation water, and its thermal stability is great that the viscosity could obtain 25 mPa·s at a temperature of 180 °C after shearing at 30 min. Furthermore, compared with conventional gelled acid, the friction reduction rate of efficient gelled acid is higher of over 7–12%. Also, the induced fracture conductivity is more than 20 D·cm at a closure stress of 60 MPa, which is higher than that of conventional gelled acid with 16.81 D·cm. In addition, during the acidification fracturing of Well PS, the efficient gelled acid system exhibits a good friction reduction property. The flow rate could reach 6 m3·min–1 and the obvious pressure drop could be observed, which indicated that the efficient gelling acid reacted with the carbonate formation, creating acidified fractures. The test production of Well PS is 23 × 104 m3·d–1 and the acid fracturing adopted by the efficient gelled acid obtains a great break at a high-temperature carbonate formation.

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Section: Property Evaluation Experiments Materials and Facilitiesmentioning

confidence: 99%

Evaluation and Application of Efficient Gelled Acid for Carbonate Formation Fracturing

Zhao¹,

Zhang³

et al. 2023

ACS Omega

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“…30 Bai et al created a DES based on citric acid, and the effectiveness of its inhibition was assessed using the bentonite soaking and linear swelling tests. 31 All of these studies demonstrate that DESs are an effective treatment agent to alleviate the instability of shale formation. In general, few research studies have examined the impact of DES components on their inhibitory effectiveness; their inhibitory effectiveness may differ depending on the HBA and HBD used.…”

Section: Introductionmentioning

confidence: 97%

“…Beg et al screened two types of brominated DESs that significantly lower the hydration swelling of clay as well as the rheology and filtrate properties of mud . Bai et al created a DES based on citric acid, and the effectiveness of its inhibition was assessed using the bentonite soaking and linear swelling tests . All of these studies demonstrate that DESs are an effective treatment agent to alleviate the instability of shale formation.…”

Section: Introductionmentioning

confidence: 99%

Deep Eutectic Solvents with Different Alkyl Chain Lengths as Inhibitors for Shale in Water-Based Drilling Fluids

Ao,

Lin,

Ren

et al. 2024

Energy Fuels

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Traditional drilling operations have relied on water-based drilling fluids, but shale's sensitivity to water poses several challenges, such as wellbore instability. To address this issue, four kinds of deep eutectic solvents (DESs) were prepared with varying alkyl chain lengths to prevent shale hydration expansion. FT-IR and proton NMR were used to analyze the structure of these DESs. To evaluate the inhibitory properties of the DESs, a series of tests were conducted, including the linear expansion test, the shale rolling recovery experiment, and the rheological properties test. The results showed that DESs were effective in preventing shale expansion due to hydration, and the results were compared to the properties of potassium chloride. Various analysis methods were adopted to understand the interaction mechanism between the clay particles and DESs, including the zeta potential test, particle size analysis, and X-ray diffraction determination. The analysis revealed that DESs can adsorb on the clay surface through electrostatic attraction and hydrogen bonding, compress the clay's electric double layer, and prevent surface hydration. Moreover, DESs can reduce the osmotic hydration as they can enter the clay layer and lower the clay layer spacing. The results indicated that DESs have the potential to be a promising shale inhibitor.

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“…The damage to the reservoir in horizontal wells is intricately linked to the stimulation technology utilized. A comprehensive comprehension of the reservoir damage, particularly the distinct uneven distribution of the affected zones along the horizontal wellbore, can effectively aid in the selection of the appropriate acidification method and refine the acid distribution process, ultimately enhancing the effectiveness of plug removal 5–9 …”

Section: Introductionmentioning

confidence: 99%

“…A comprehensive comprehension of the reservoir damage, particularly the distinct uneven distribution of the affected zones along the horizontal wellbore, can effectively aid in the selection of the appropriate acidification method and refine the acid distribution process, ultimately enhancing the effectiveness of plug removal. [5][6][7][8][9] Compared to vertical wells, horizontal wells have a larger contact area with the reservoir, and the duration of contact between the drilling fluid, completion fluid, and the reservoir is significantly longer. The pressure difference when drilling into oil and gas reservoirs is greater than that of vertical wells.…”

mentioning

confidence: 99%

Simulation of reservoir dynamic damage and influencing factors of horizontal wells in heterogeneous carbonate reservoirs

Xu,

Wang,

Gao

et al. 2024

Energy Science & Engineering

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As the development of well types for low permeability reservoirs shifts from vertical to highly inclined/horizontal wells, targeted studies of oil and gas reservoir damage must be conducted for such well types to improve the science and effectiveness of acidification conversion. Taking into account the formation of mud cake and the dynamic damage factors caused by drilling fluid on the reservoir during horizontal well drilling, a refined dynamic description model for nonuniform damage in horizontal wells was established. The coupled simulation accounts for the dynamical destruction of the skin factor of the reservoir and the dynamical generation of the slurry. The coupled model consists of a radial mud cake dynamic formation model, a reservoir damage radius model, a permeability distribution model, and a horizontal well inhomogeneous skin factor model. It captures the dynamic evolution of reservoir damage due to drilling fluid contamination during horizontal well drilling and provides a real‐time representation of changes in the reservoir skin factor of horizontal wells, measuring the depth and extent of radial reservoir damage. Clarifying the extent of reservoir damage and its impact in horizontal well sections can help select appropriate acidification methods, improve acid distribution processes, and ultimately improve the effectiveness of mitigating reservoir damage and increasing oil and gas well productivity.

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Investigation of the Mechanism and Effect of Citric Acid-Based Deep Eutectic Solvents Inhibiting Hydration and Expansion of Gas Shale Clay Minerals

Cited by 13 publications

References 50 publications

Evaluation and Application of Efficient Gelled Acid for Carbonate Formation Fracturing

Evaluation and Application of Efficient Gelled Acid for Carbonate Formation Fracturing

Deep Eutectic Solvents with Different Alkyl Chain Lengths as Inhibitors for Shale in Water-Based Drilling Fluids

Simulation of reservoir dynamic damage and influencing factors of horizontal wells in heterogeneous carbonate reservoirs

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