Synthesis, aggregation behavior of alternating copolymer emulsifier in oil solution and its application in oil-based drilling fluids

Chen, Yanru; Song, Qi; Tan, Yang

doi:10.1016/j.molliq.2021.118011

Cited by 12 publications

(2 citation statements)

References 31 publications

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“…This will contribute to electrical stability by minimizing the formation of conductive pathways in the fluid. , Moreover, Claytone-EM helps prevent coalescence and the destabilization of water droplets, thereby maintaining the stability of the emulsion. This stabilization effect indirectly contributes to the electrical stability of the drilling fluid by reducing the potential for phase separation and minimizing changes in electrical properties. − …”

Section: Resultsmentioning

confidence: 99%

Evaluating the Effect of Claytone-EM on the Performance of Oil-Based Drilling Fluids

Mahmoud,

Gajbhiye,

Elkatatny

2024

ACS Omega

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This study provides a detailed characterization and evaluation of Claytone-EM as a rheological additive to enhance the performance of oil-based drilling fluids (OBDFs) under high-pressure, high-temperature (HPHT) conditions. It also offers a comparative evaluation of the effectiveness of Claytone-EM with an existing organoclay, analyzing their mineral and chemical compositions, morphologies, and particle sizes. A series of experiments are performed to evaluate Claytone-EM’s influence on crucial drilling mud properties, such as mud density, electrical stability, sagging tendency, rheology, viscoelastic properties, and filtration properties, to formulate a stable and high-performing OBDF. Results indicated that Claytone-EM had no significant impact on mud density but remarkably enhanced emulsion stability. Claytone-EM effectively mitigated sagging issues under both static and dynamic conditions, leading to improvements in the plastic viscosity (PV), yield point (YP), apparent viscosity (AV), and YP/PV ratio. The PV, YP, AV, and YP/PV ratios were improved by 11, 85, 28, and 66% increments, respectively, compared with those of the drilling fluid formulated with MC-TONE. The addition of Claytone-EM resulted in enhancing gel strength and improving the filtration properties of the drilling fluid. The filtration volume was reduced by 2% from 5.0 to 4.9 cm3, and the filter cake thickness had a 13% reduction from 2.60 to 2.26 mm. These findings highlight Claytone-EM as a valuable additive for enhancing OBDF performance, particularly under challenging HPHT conditions. Its ability to provide emulsion stability, reduce static and dynamic sag, and control filtration holds the potential to enhance drilling operations, minimize downtime, and bolster wellbore stability. This study acknowledges certain limitations, including its temperature range, which could benefit from exploration at extreme temperatures. Additionally, the absence of flow experiments limits a comprehensive understanding of sag effects, and further research and field-scale evaluations are recommended to validate and optimize the application of Claytone-EM in OBDFs.

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Section: Resultsmentioning

confidence: 99%

Evaluating the Effect of Claytone-EM on the Performance of Oil-Based Drilling Fluids

Mahmoud,

Gajbhiye,

Elkatatny

2024

ACS Omega

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“…A large number of wellbore instability problems occur during ultra-deep well drilling [ 8 ]. Oil-based drilling fluids [ 9 , 10 ] with the advantages of high-temperature resistance and strong inhibition are used to solve the problem of wellbore instability [ 11 , 12 ]. However, during the circulation of oil-based drilling fluids, and after the residual oil phase is mixed with barite, there is sedimentation [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Nano-Cleaning Fluid for Downhole Casing Cleaning

Song

Zhang

et al. 2023

Polymers

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In drilling and completion projects, sludge is formed as a byproduct when barite and oil are mixed, and later sticks to the casing. This phenomenon has caused a delay in drilling progress, and increased exploration and development costs. Since nano-emulsions have low interfacial surface tension, wetting, and reversal capabilities, this study used nano-emulsions with a particle size of about 14 nm to prepare a cleaning fluid system. This system enhances stability through the network structure in the fiber-reinforced system, and prepares a set of nano-cleaning fluids with adjustable density for ultra-deep wells. The effective viscosity of the nano-cleaning fluid reaches 11 mPa·s, and the system is stable for up to 8 h. In addition, this research independently developed an indoor evaluation instrument. Based on on-site parameters, the performance of the nano-cleaning fluid was evaluated from multiple angles by heating to 150 °C and pressurizing to 3.0 Mpa to simulate downhole temperature and pressure. The evaluation results show that the viscosity and shear value of the nano-cleaning fluid system is greatly affected by the fiber content, and the cleaning efficiency is greatly affected by the concentration of the nano-emulsion. Curve fitting shows that the average processing efficiency could reach 60–85% within 25 min and the cleaning efficiency has a linear relationship with time. The cleaning efficiency has a linear relationship with time, where R2 = 0.98335. The nano-cleaning fluid enables the deconstruction and carrying of the sludge attached to the well wall, which accomplishes the purpose of downhole cleaning.

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Smart antimicrobial Pickering emulsion stabilized by pH-responsive cellulose-based nanoparticles

Meng

Zhou

Chen

et al. 2023

International Journal of Biological Macromolecules

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Synthesis, aggregation behavior of alternating copolymer emulsifier in oil solution and its application in oil-based drilling fluids

Cited by 12 publications

References 31 publications

Evaluating the Effect of Claytone-EM on the Performance of Oil-Based Drilling Fluids

Evaluating the Effect of Claytone-EM on the Performance of Oil-Based Drilling Fluids

A Nano-Cleaning Fluid for Downhole Casing Cleaning

Smart antimicrobial Pickering emulsion stabilized by pH-responsive cellulose-based nanoparticles

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