Asphaltentic and other polar organic compounds in crude oil form aggregates, precipitate, adhere to surfaces, block rock pores and severely alter the wetting characteristics of mineral surfaces within the reservoir, hindering oil recovery efficiency. Tremendous experimental efforts have been done to investigate asphaltene

We develop a technique to experimentally measure dynamic pore contact angle. Dynamic pore contact angle increases monotonically with the contact-line velocity. Surface tension and viscosity affect the dynamic pore contact angle significantly. A new empirical correlation developed can predict dynamic wetting in a small pore. The dynamic contact angle results are correlated with the Crispation number (Cr).

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CH 4 concentration and CO 2 separation from biogas (CH 4 /CO 2 ) by an one-stage hydrate formation was supposed to be a prospective and economical practicable technology compared with traditional gas separation methods. We investigated the influence of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM] PF 6 ) on simulated biogas (64.0 mol %CH 4 /CO 2 ) hydrate separation in this work. The thermodynamic promoter TBAB was combined with [BMIM] PF 6 to investigate binary gas hydrate formation and separation efficiency. Different parameters which affected hydrate formation were investigated. The concentration of [BMIM] PF 6 was 1000/2000/3000 ppm, and the optimized concentration of TBAB was 4 wt %. With respect to the hydrate gas separation results, the addition of TBAB can decrease CH 4 /CO 2 hydrate formation pressure greatly and the hydrate formation induction time. CH 4 in the remaining gas can be increased from 64.0 to 79.90 mol %, and CH 4 recovery can arrive at 95.83%. Meanwhile, the addition of [BMIM] PF 6 could increase the CO 2 mole friction in hydrate from 36.0 to 58.63 mol %. So it was demonstrated that the combination of TBAB + [BMIM] PF 6 would have a great application prospect on biogas purification technology.