Effects of geometrical parameters of an oil-water separator on the oil-recovery rate

Linfeng Piao,김나영,박형민 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6

As the economical and environmental damages due to the accidental oil-spills in marine environment increase gradually, more activecountermeasure needs to be developed. In this respect, in the present study, we propose a new design of oil-water separation system andinvestigate the effects of several geometrical features on the oil-recovery rate, based on a two-dimensional numerical simulation. Theworking mechanism of current separator is to utilize the density difference between the oil and water, which is strengthened by addingmomentum to the oil-water mixture flow through a “U-shaped” passage. Along the flow passage, we locate additional parts such as baffleplate, weir plate, and water outlet. While optimizing the conditions of these to maximize the oil recovery, it is found that the formationand stable retention of water layer between the water outlet and weir plate is critical to separate and store the above-layered oil. Finally,these findings are further confirmed with a basic experimental test with a three-dimensional oil-water separator model.

유증기 방폭 장치를 적용한 해상 오일 유출 회수장치(Oil skimmer)에 대한 실험적 연구

함성훈(Seong-Hun Ham),정찬섭(Chan-sub Jung) 한국가스학회 2015 한국가스학회지 Vol.19 No.6

본 연구는 해상 유류오염사고가 발생한 경우 효율적인 방재 작업을 수행하기 위하여 개발된 오일 회수장치로서, 오일 회수장치를 통하여 해상에 유출된 기름을 높은 회수율로 신속하게 처리하는 것을 목표로 한다. 오일 회수장치는 기존의 흡착포 및 유류처리제를 이용한 정화 방식에서 발생하는 2차 오염을 방지할 수 있으며 오일 회수율 또한 우수한 특징을 가진다. 또한 유증기에 의한 폭발 방지 기구를 채택하여 오일 회수 작업시 발생할 수 있는 위험 요소를 제거 하였다. In this paper is proposed for the oil return device developed to perform efficient emergency operation in the event the sea oil spill. Oil recovery apparatus for spilled oil on marine aims to quickly purged with high recovery. Oil recovery apparatus can prevent secondary pollution which may occur in the purification method using the adhesion agent and chemicals. Also it has excellent properties oil recovery. Adopted by the vapor explosion-proof mechanism to remove the risks that may occur during oil recovery operations.

Superhydrophobic MoS2-based multifunctional sponge for recovery and detection of spilled oil

Tae-Jun Ko,Jae-Hoon Hwang,Dwight Davis,Mashiyat Sumaiya Shawkat,Sang Sub Han,Kelsey L. Rodriguez,Kyu Hwan Oh,Woo Hyoung Lee,정연웅 한국물리학회 2020 Current Applied Physics Vol.20 No.2

Oil spills are a major threat to the marine ecosystem, requiring immediate solutions to remove spilled oil from oceanic environments. In this study, we report a superhydrophobic molybdenum disulfide (MoS2) coated polydimethylsiloxane (PDMS) sponge and demonstrate its high proficiency in spilled oil recovery and oil spill detection based on oil-water separation ability. This novel oil sorbent is fabricated by a simple dip-coating to incorporate MoS2 flakes into PDMS sponge. The optimized MoS2-sponge displays a water contact angle of>152°, demonstrating excellent superhydrophobicity and high oil absorption (> 97 wt%) for a variety of oils, including vegetable oil and fuel waste. Moreover, the material retains excellent oil absorption capability upon repetitive compression cycles. The versatility of this novel sorbent has been extended for the real-time spontaneous detection of oils by taking advantage of electrically conductive MoS2 layers.

Surfactant–polymer flooding characteristics for heavy oil recovery with varying injection volumes of surfactant and polymer

장성범,전보현 한국자원공학회 2014 Geosystem engineering Vol.17 No.2

A laboratory surfactant–polymer flooding experiment was performed to improve the recovery of heavy oil. The surfactant phase behavior tests and a series of flooding experiments were conducted to find the best and optimal additional oil recovery condition after water flooding using a surfactant–polymer slug. Through the phase behavior tests, it was found that a combination of a 2.5 wt% surfactant solution with 1.5 wt% of salinity was the optimal for injection experiments. In the surfactant–polymer flooding, the combination of injected volume which was 0.6 pore volume (PV) of combined slugs of surfactant and polymer was varied in each test. The additional oil recovery obtained by the surfactant–polymer flooding after water flooding ranged from 13.6% to 28.6%. With the same total volume of the surfactant and polymer, the oil recovery decreased as the volume of polymer increased when the volume of polymer was lesser than the volume of surfactant; however, the oil recovery increased with increase in the volume of the polymer when the volume of the polymer was greater than or equal to the volume of the surfactant. The highest oil recovery of 28.6% was obtained by injecting 0.1 PV of surfactant and 0.5 PV of polymer.

Recent advances in ionic liquids as alternative to surfactants/chemicals for application in upstream oil industry

Achinta Bera,Jatin Agarwal,Maunish Shah,Subhash Shah,Rakesh Kumar Vij 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-

The oil industry is in search of the stable chemicals that can be applied in drilling, stimulation, enhancedoil recovery at high temperature and high salinity reservoirs, unconventional heavy oil recovery bysolvent extraction method, andflow assurance. This quest has opened a new category of research on ionicliquids. In the present review, an attempt is made to explore the ongoing research and development onthe application of ionic liquids in the domain of upstream oil industry. The review provides a deep insightinto the progress and status of current research, challenges and utilization of ionic liquids for drilling,stimulation, enhanced oil recovery, unconventional oil recovery, andflow assurance. It is found from theliterature that ionic liquids can be used to prevent shale inhibition, improve clay stabilization and drillingfluid properties, compose fracturingfluids, control wax and asphaltenes deposition, prevent gas hydrateformation, increase additional oil recovery, and improve unconventional oil recovery. It is also expectedthat the current review will open new avenues for the budding researchers and engineers to utilize ionicliquids in upstream oil and gas industry and to acquire profound ideas for its way forward.

Resource recovery and harmless treatment of waste oil-in-water drilling fluid

Chao Tang,Shui Xiang Xie 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.3

Destablization and demulsification is a difficult task for the treatment of waste oil-in-water drilling fluid because of its “three-high” characteristics: emulsification, stabilization and oiliness. At present, China is short for effective treating technology, which restricts cleaner production in oilfield. This paper focused on technical difficulties of waste oil-in-water drilling fluid treatment in JiDong oilfield of China, adopting physical-chemical collaboration demulsification technology to deal with waste oil-in-water drilling fluid. After oil-water-solid three-phase separation, the oil recovery rate is up to 90% and the recycled oil can be reused for preparation of new drilling fluid. Meanwhile, harmless treatment of wastewater and sludge from waste oil-in-water drilling fluid after oil recycling was studied. The results showed that wastewater after treated was clean, contents of chemical oxygen demand and oil decreased from 993 mg/L and 21,800 mg/L to 89 mg/L and 3.6 mg/L respectively, which can meet the requirements of grade one of “The National Integrated Wastewater Discharge Standard” (GB8978); The pollutants in the sludge after harmless treatment are decreased below the national standard, which achieved the goal of resource recovery and harmless treatment on waste oil-in-water drilling fluid.

Enhanced oil recovery using nanoparticle-stabilized oil/water emulsions

Hanam Son,Geunju Lee,김현태,김진웅,성원모 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2

We experimentally investigated nanoparticle-stabilized emulsions for enhanced oil recovery (EOR) applications. The emulsions were injected into a silica bead column containing mineral oil, and the oil recovery was calculatedusing a mass-balance approach. The experiments were carried out as follows: 1) The emulsions were injected into acolumn with 100% water saturation to investigate the mobility of the water and emulsions, 2) Water flooding was thencarried out at initial oil and water saturation, and the emulsion flooding was injected to calculate the enhancement inthe oil recovery rate. The results indicate that the nanoparticle-stabilized emulsions increased the oil recovery rate by11% after water flooding. The mechanism for this is attributed to a greater pressure difference across the porous medium,leading to oil remaining in the pores being produced via a piston effect. These results indicate that nanoparticle-stabilizedemulsions may be effective EOR agents.

Enhanced oil recovery using oil-in-water (o/w) emulsion stabilized by nanoparticle, surfactant and polymer in the presence of NaCl

Tushar Sharma,Jitendra S. Sangwai,G. Suresh Kumara 한국자원공학회 2014 Geosystem engineering Vol.17 No.3

A conventional waterflood often leads to unsuccessful recovery of oil, as most of the injected water tends to channel into the more permeable zones. Pickering emulsions stabilized using surfactant and colloidal particles, such as nanoparticles, are gaining wider recognition in the petroleum industry due to their better thermal stability and stabilized flow behavior. In this work, a novel formulation of oil-in-water (o/w) emulsion stabilized using nanoparticle–surfactant–polymer in the presence of salt (NaCl) is investigated for improved oil recovery at conditions of high pressure (13.6MPa) and high temperature (313–363 K).We report a comparative study of performance of o/w emulsion flooding with conventional water flooding for enhanced oil recovery of a crude oil having a viscosity of 161 mPa s at 313K in a Berea sandstone core using core-flood experiments. The results of core flooding tests show that an incremental oil recovery of more than 23% of original oil in place over water flooding can be obtained using an emulsion flooding formulated in this work.

The potential applications in oil recovery with silica nanoparticle and polyvinyl alcohol stabilized emulsion

Son, H.A.,Yoon, K.Y.,Lee, G.J.,Cho, J.W.,Choi, S.K.,Kim, J.W.,Im, K.C.,Kim, H.T.,Lee, K.S.,Sung, W.M. Elsevier 2015 Journal of petroleum science & engineering Vol.126 No.-

<P><B>Abstract</B></P> <P>We investigated the use of silica nanoparticle-stabilized emulsions to displace oil in porous media. A low-quality (20%) n-decane-in-water emulsion was injected into a glass-bead pack containing mineral oil under residual oil saturation conditions. Continuous injection of the emulsion caused steady trapping and accumulation of emulsion droplets, which occurred despite the fact that the bead sizes were 250–500µm, whereas the average droplet size was ~30µm, as indicated by particle size analysis. By alternately injecting small banks of emulsion (0.1 pore volume (PV)) and water (0.23−0.1PV), the extent of emulsion droplet trapping could be controlled while achieving oil recovery.</P> <P>The effects of salt addition and polyvinyl alcohol (PVA)/nanoparticle concentration were also investigated in terms of emulsion stability and oil recovery. The salt addition (1wt%) more efficiently stabilized the droplets without significant coalescence and contributed to approximately 4% more oil recovery than achieved in the absence of an emulsion system. The PVA/nanoparticle concentration indicated that the emulsion with a low concentration (0.05wt%) of PVA and a high concentration (3wt%) of nanoparticles had greater stability and enhanced oil recovery compared with the opposite (a high concentration (0.2wt%) of PVA and low concentration (1wt%) of nanoparticles). These results indicated that the addition of salt and PVA/nanoparticle concentration influenced oil recovery and emulsion stability. Oil recovery was related to emulsion stability.</P>

Synthesis and characterization of a new polymeric surfactant for chemical enhanced oil recovery

Ajay Mandal,Keshak Babu,Nilanjan Pal,Vinod Kumar Saxena 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2

Chemical enhanced oil recovery methods are field proven techniques that improve efficiency and effectiveness of oil recovery. We have synthesized polymeric surfactant from vegetable oil (castor oil) for application in chemical enhanced oil recovery. First, an eco-friendly surfactant, sodium methyl ester sulfonate (SMES) was synthesized from castor oil, and then the polymeric surfactant (PMES) was produced by graft co-polymerization reaction using different surfactant to acrylamide ratios. The synthesized PMES was characterized by FTIR, FE-SEM, EDX, TGA, DLS analysis. The performance of PMES as a chemical agent for enhanced oil recovery was studied by measuring the interfacial tension (IFT) between crude oil and PMES solution, rheological behavior and contact angle against sandstone surface. Addition of sodium chloride in PMES solution reduced the IFT to an ultra-low value (2.0×10−3mN/m). Core flooding experiments were conducted in sandpack system, and 26.5%, 27.8% and 29.1% additional recovery of original oil in place (OOIP) was obtained for 0.5, 0.6 and 0.7mass% of PMES solutions, respectively, after conventional water flooding.