Study of the slippage of particle/supercritical CO2 two-phase flow

Abstract

. (2016) Study of the slippage of particle / supercritical CO2 two-phase flow. Journal of Supercritical Fluids. Permanent WRAP URL:http://wrap.warwick.ac.uk/82084 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription.For more information, please contact the WRAP Team at: wrap@warwick.ac.uk 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 fou nd t o have agreat eri nfl u ence on t he sl i ppage t han t he vi scosi t y.M oreover,acompari son of t he sl i ppage bet ween SC -C O 2 and wat ershowed t hatt he part i cl e sl i ppage i n wat erwas const ant , whi l e t he part i cl e sl i ppage i n SC -C O 2 cont i nu al l y accu mu l at ed atan ex t remel y sl ow rat e.Keywords: su percri t i calC O 2 ;t wo-phase fl ow;vi su al i zat i on ex peri ment s;anal yt i c cal cu l at i ons; sl i ppage behavi or

Microcosmic understanding on thickening capability of copolymers in supercritical carbon dioxide: the key role of π–π stacking

“…In the oil and gas industry, CO 2 is usually used in enhance oil recovery (EOR), and is considered as one type of clean fracturing uid which is expected to replace the traditional water-based fracturing uids. [1][2][3] The primary disadvantage of CO 2 which has limited its use in EOR is its bad spread efficiency due to the lower viscosity and the large mobility difference compared to oil. [4][5][6] As a fracturing uid, one of the functions of CO 2 is to transport proppants into reservoir fractures to support oil-gas pathway, so enhancing the viscosity of CO 2 by adding thickening agents is an urgent challenge not only for increasing the spread efficiency but also for improving the proppant carrying capacity.…”

An evaluation method of supercritical CO2 thickening result for particle transporting

“…Previous studies have proposed the particle motion models in SC-CO2 [16,17]. Both of the models were verified to be accurate by experiments and were also qualified by numerical analyses.…”

“…This indicate that the vertical and horizontal velocities of particle are constant. Previous studies found that the particles experienced a very short acceleration before they kept a constant velocity flowing with SC-CO2 [16,17]. The different locations of particles might be caused by the interactions between particles when they first entered into the experimental apparatus.…”

Study on filtration patterns of supercritical CO2 fracturing in unconventional natural gas reservoirs

“…SC‐CO 2 exhibits high density, low viscosity, low surface tension, a high diffusion coefficient, and excellent heat‐transfer and mass‐transfer performance . SC‐CO 2 fracturing fluids cause no damage to the reservoir, which offers effective prevention of near‐wellbore blockages and accordingly affords protection to the reservoir and improves reservoir permeability, in addition, the fluids can easily flow back . They are also capable of dehydrating tight clayey sands, enlarging their pores and throats and decreasing the skin factor …”

“…4,5 SC-CO 2 fracturing fluids cause no damage to the reservoir, which offers effective prevention of near-wellbore blockages and accordingly affords protection to the reservoir and improves reservoir permeability, in addition, the fluids can easily flow back. 6,7 They are also capable of dehydrating tight clayey sands, enlarging their pores and throats and decreasing the skin factor. [8][9][10] Fracturing fluids penetrate through the fracture surface into the formation under the pressure differential between the formation and the fracture.…”