Mechanism of shales stabilization by hydrophobized poly(ethylene glycol)/K+ in water-base drilling fluids

Villabona-Estupiñán, Santiago; Jorge, de Almeida Rodrigues; Abreu, Carolina Ferreira de; Nascimento, Regina Sandra Veiga

doi:10.1016/s1876-3804(21)60058-7

Petroleum Exploration and Development

2021

DOI: 10.1016/s1876-3804(21)60058-7

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Mechanism of shales stabilization by hydrophobized poly(ethylene glycol)/K+ in water-base drilling fluids

Santiago Villabona-Estupiñán

de Almeida Rodrigues Jorge

Carolina Ferreira de Abreu

et al.

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2024

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Cited by 3 publications

References 27 publications

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Performance and mechanism of new silicone polymer as filtrate reducer with inhibitory effect for water-based drilling fluid

Ban¹,

Xu²,

Zeng³

et al. 2022

Eng. Res. Express

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An organic silicon filtrate reducer (AATN) with inhibitory effect, which can resist temperature up to 180℃, was synthesized by using acrylamide (AM), vinyl trimethoxysilane (A-171), allyltrimethylammonium chloride (TM) and N-vinyl pyrrolidone (NVP) as monomers. AATN can effectively reduce the filtration loss of drilling fluid and inhibit the hydration expansion and hydration dispersion of the clay, which was beneficial to wellbore stability. Experimental results showed that the API filtration loss (FLAPI) of the drilling fluid containing 2 wt% AATN was only 7.8mL. The siloxane groups of AATN were hydrolyzed in aqueous solution to generate Si-OH bonds, which can react with Si-OH bonds on hydrated clay surface to form a strong chemical adsorption. It was conducive to maintaining the dispersion of clay particles in the drilling fluid. The stable grid structure was formed by AATN and clay particles to reduce mud cake permeability, which can reduce the damage of drilling fluid filtrates to borehole stability. In addition, AATN can adsorb on the surface of sodium bentonite, thus forming a hydrophobic adsorption film on its surface, which effectively enveloped bentonite and inhibited the hydration expansion of bentonite.

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Performance and mechanism of new silicone polymer as filtrate reducer with inhibitory effect for water-based drilling fluid

Ban¹,

Xu²,

Zeng³

et al. 2022

Eng. Res. Express

View full text Add to dashboard Cite

show abstract

Wellbore Stability Analysis of Horizontal Wells for Shale Gas With Consideration of Hydration

Mao

Lin

Cai

et al. 2022

Journal of Energy Resources Technology

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With the wide application of extended reach wells and horizontal wells, the geological conditions faced during the drilling process have become increasingly complicated, and the resulting wellbole collapse problem has become serious. Based on an L-1 horizontal well, this study provides a method for calculating collapse pressure considering the influence of formation hydration. This method is used to obtain the stress distribution around the well and collapse situation at 4100 m underground.The wellbore stability can be evaluated by the method. The factors affecting the stress and collapse of the well are analyzed by changing the construction parameters and geological parameters. Studies have shown that the rock near the well has collapsed to a certain extent and shale hydration increases formation poisson's ratio, resulting in more serious collapse. The study also found that hydration, drilling fluid density and borehole size have the greatest impact on the stability of the borehole wall, followed by the well deviation angle, and the bedding angle the least. Carefully exploring the situation of the shale gas reservoir in the drilling design stages, considering the impact of hydration, and selecting appropriate construction parameters are necessary to avoid the collapse of the shaft wall and affect the shale gas production process.This study can provide a reference for ensuring the stability of the wellbore.

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Study on the Inhibition Mechanism of Hydration Expansion of Yunnan Gas Shale using Modified Asphalt

Dai,

Sun,

Liu

et al. 2024

Materials

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Drilling fluids play an essential role in shale gas development. It is not possible to scale up the use of water-based drilling fluid in shale gas drilling in Yunnan, China, because conventional inhibitors cannot effectively inhibit the hydration of the illite-rich shale formed. In this study, the inhibition performance of modified asphalt was evaluated using the plugging test, expansion test, shale recovery experiment, and rock compressive strength test. The experimental results show that in a 3% modified asphalt solution, the expansion of shale is reduced by 56.3%, the recovery is as high as 97.8%, water absorption is reduced by 24.3%, and the compression resistance is doubled compared with those in water. Moreover, the modified asphalt can effectively reduce the fluid loss of the drilling fluid. Modified asphalt can form a hydrophobic membrane through a large amount of adsorption on the shale surface, consequently inhibiting shale hydration. Simultaneously, modified asphalt can reduce the entrance of water into the shale through blocking pores, micro-cracks, and cracks and further inhibit the hydration expansion of shale. This demonstrates that modified asphalt will be an ideal choice for drilling shale gas formations in Yunnan through water-based drilling fluids.

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Mechanism of shales stabilization by hydrophobized poly(ethylene glycol)/K+ in water-base drilling fluids

Cited by 3 publications

References 27 publications

Performance and mechanism of new silicone polymer as filtrate reducer with inhibitory effect for water-based drilling fluid

Performance and mechanism of new silicone polymer as filtrate reducer with inhibitory effect for water-based drilling fluid

Wellbore Stability Analysis of Horizontal Wells for Shale Gas With Consideration of Hydration

Study on the Inhibition Mechanism of Hydration Expansion of Yunnan Gas Shale using Modified Asphalt

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