Synthesis and Inhibitive Mechanism of a Novel Clay Hydration Inhibitor for Water-based Drilling Fluids

Slaný

et al. 2022

Materials

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Improving the tribological characteristics of water-based drilling fluids by adding graphene-based lubricants has garnered attention because of the potential for a range of inorganic-material-based additives at high temperature. In this study, we constructed a green and simple adsorption approach to prepare highly dispersed graphite using a cationic surfactant for graphite modification. The findings demonstrated that the prepared graphite was highly dispersed in water and had a low sedimentation rate and small contact angle in distilled water. The concentration dosage of cetyltrimethylammonium chloride (CTAC) on graphite was 0.02 g/g. We evaluated the performance of the modified graphite as a lubricated additive in water-based drilling through a rheological study and viscosity coefficient measurement. The results showed that the viscosity coefficient of drilling fluid with 0.05% modified graphite was reduced by 67% at 180 °C. We proved that the modified graphite can significantly improve the lubrication performance of drilling fluid. Furthermore, we revealed the lubrication mechanism by analyzing the chemical structural and crystalline and morphological features of graphite through a particle size test, zeta potential test, Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), and scanning electron microscopy (SEM) measurements. The results indicated that the modification of graphite by CTAC only occurs through physical adsorption, without changing the crystal structure. These findings provide a reference for the development of high-performance water-based drilling fluids.

Section: Resultsmentioning

confidence: 99%

Lubricity and Rheological Properties of Highly Dispersed Graphite in Clay-Water-Based Drilling Fluids

Slaný

et al. 2022

Materials

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“…Eventually, precipitate was wholly seen in the beaker. The obtained mixed precipitate was sealed and aged at room temperature for 1 h [ 18 , 19 ]. The aged precipitate was centrifuged at 1500 r for 10 min to obtain the product.…”

Section: Methodsmentioning

confidence: 99%

Multi-Mixed Metal Hydroxide as a Strong Stratigraphic Nanoclay Inhibitor in Solid-Free Drilling Fluid

Zhang

et al. 2022

Nanomaterials

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Solid-free drilling fluid has more advantages as a new type of drilling fluid compared with traditional drilling fluid, such as improving drilling efficiency, protecting oil and not having clay particles clog the oil and gas layer. In this study, Zn/Cu/Fe-doped magnesium–aluminum hydroxide (Mg-Al MMH) was prepared using the co-precipitation method and evaluated in solid-free drilling fluid. The inhibition mechanism of synthesized hydroxide was analyzed by X-ray diffraction, laser particle-size analysis and thermogravimetric analysis. The samples were directly used as drilling fluid base muds for performance evaluation. The results showed that the linear expansion rate of 4% M6-Fe was only 12.32% at room temperature within 2 h, that the linear expansion rate was 20.28% at 90 °C and that the anti-swelling rate was 81.16% at room temperature, indicating that it has a strong inhibition ability at both room temperature and at high temperatures. Meanwhile, the possibility of multi-mixed metal hydroxide as a drilling fluid base mud is discussed in this study. We found that 4% M6-Fe exhibited low viscosity, a high YP/PV ratio and high temperature resistance, and its apparent viscosity retention rate reached 100% rolled at 200 °C for 16 h, with a YP/PV ratio of 2.33.

“…A Zetasizer nano ZS (Malvern, UK) was used to determine the change in the zeta potential of bentonite suspension. [20].…”

Section: Particle Distribution Measurementmentioning

confidence: 99%

Preparation and application of a new polyhydroxy ammonium shale hydration inhibitor

Jun

Chen

et al. 2023

Preprint

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In this paper was study the wellbore instability caused by hydration of shale formation during drilling is a major problem in drilling engineering. A polyhydroxy-alkanolamine was synthesized, and the shale inhibition performance was evaluated by anti-swelling test, linear swelling test, wash-durable test and bentonite hydration and dispersion experiment. The shale inhibition mechanism of polyhydroxy-alkanolamine was studied by Fourier transform infrared spectroscopy (FTIR), particle size distribution, Zeta potential, Thermal analysis and Scanning electron microscopy (SEM). The main results show that the use of polyhydroxy-alkanolamine (EGP-2) can result in a relatively lower linear swelling rate of bentonite, and the linear swelling rate of 0.3% EGP-2 was 26.98%, which is stronger compared with 4% KCl. The anti-swelling rate of 0.3% EGP-2 was 43.54%, the shrinkage swelling rate of 0.3% EGP-2 was 34.62%. Results show that EGP-2 may permeate and adsorb on the bentonite surface. The rolling recovery rate of easily hydrated shale was high as 79.36%, which greatly reduces the dispersion ability of water to easily hydrated shale. The results of this study can be used to maintain the stability of the wellbore, which is conducive to related research.