Amino acids as kinetic inhibitors for tetrahydrofuran hydrate formation: Experimental study and kinetic modeling

Synergism of thermodynamic hydrate inhibitors on the performance of poly (vinyl pyrrolidone) in deepwater drilling fluid

“…Therefore, it could be concluded that PVP performed as a KHI by inhibiting both hydrate nucleation and hydrate growth. Rheological property is one of the most important properties for drilling fluid, especially for deepwater drilling fluid because the low temperature could lead to catastrophic increase in viscosity and gel strength (Zamora et al, 2000;Naeiji et al, 2014). The rheological properties of drilling fluid with different concentration of PVP were tested, as shown in Table 3.…”

Effect of Dissolution and Dispersion Conditions of VC-713 on the Hydrate Inhibition

“…(1) A small amount of solution was taken using a dropper, dropped onto a mica film, and followed by placing it in liquid nitrogen for 2.0 min (2) e frozen sample was then placed into a freeze-drier and lyophilized for 20.0 h (3) SEM was used to observe the mesostructure after the sample preparation Figure 2 shows the variations of each experiment in temperature (take the curves obtained in one experiment as an example). e experimental data (see Table 1), such as the induction time of THF hydrate formation (determined through the generalized method [28]), and the supercooling condition (kinetic inhibitors do not change the hydrate phase equilibrium condition [15,29,30], whereas the phase equilibrium temperature for the formation of THF hydrate under atmospheric pressure is about 277.15 K [24,26]) were obtained from Figure 2. From Figure 2 and the data in Table 1, it can be observed that, when the dissolution and dispersion condition of VC-713 in the sample was better and its concentration increased, the induction time of hydrate formation prolonged.…”

“…Consequently, it is likely to have an impact on its ability to inhibit hydrate formation. In order to verify this corollary and clarify the underlying mechanism of VC-713 inhibiting hydrate formation, different amounts of VC-713 (0.5 wt.% and 1.0 wt.%) were dissolved and dispersed in aqueous solutions to different degrees, and then, their hydrate inhibition was evaluated through tetrahydrofuran (THF) hydrate formation experiments (THF hydrate has been widely used for screening natural gas hydrate inhibitors because THF is a liquid entirely miscible with water and forms hydrate with water at 278.15 K and atmospheric pressure [23,24]). According to the concentration change of VC-713 in the hydrate formation process and the mesoscopic structure of VC-713 aqueous solution, the impact mechanism is analyzed from macroscopic, mesoscopic, and microscopic scales.…”

Synergistic effects of nonylphenol ethoxylates and polyethylene glycols on performance of gas hydrate kinetic inhibitor

“…In contrast, AAs allow hydrates to form while avoiding accumulation into large masses [9,10]. The common KHIs are polymers with lactam rings such as polyvinylpyrrolidone (PVP) and polyvinylcaprolactam (PVCap) [11].…”