The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Caili Dai - One of the best experts on this subject based on the ideXlab platform.
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novel chemical flooding system based on dispersed particle gel coupling in depth Profile Control and high efficient oil displacement
Energy & Fuels, 2019Co-Authors: Yifei Liu, Chenwei Zou, Daiyu Zhou, Mingwei Gao, Guang Zhao, Caili DaiAbstract:In order to achieve both in-depth Profile Control and high efficient oil displacement, a novel heterogeneous combination flooding system (HCFS) composed of dispersed particle gel (DPG) and dodecyl ...
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dispersed particle gel strengthened polymer surfactant as a novel combination flooding system for enhanced oil recovery
Energy & Fuels, 2018Co-Authors: Guang Zhao, Caili DaiAbstract:A novel dispersed particle gel-strengthened polymer–surfactant (DPS) combination flooding system was proposed and demonstrated for enhanced oil recovery in high water cut mature oilfields. As compared to a conventional polymer–surfactant (PS) combination flooding system, DPS systems have a higher viscosity and a more stable network structure. The polymer is mainly a source of the viscosity, while the surfactant plays a key role in reducing the interfacial tension (IFT). The added dispersed particle gel (DPG) has a synergistic viscosity increase effect, whereas for the DPG particles, the salinity and aging time have a slight effect on the IFT reduction capacity of the DPS system. On the basis of sand-pack flowing experiments, the DPS system has a better mobility Control capacity than the PS system in the combination flooding stage and the following water flooding stage. Parallel sand-pack flowing experiments indicate that injection of a DPS system can effectively improve the Profile Control. The added DPG ...
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preparation and application of a novel phenolic resin dispersed particle gel for in depth Profile Control in low permeability reservoirs
Journal of Petroleum Science and Engineering, 2018Co-Authors: Guang Zhao, Qing You, Jiaping Tao, Hafiz Aziz, Caili DaiAbstract:Abstract Phenolic resin dispersed particle gel (PDPG) was successfully prepared from bulk gel by a mechanical shearing method. The effects of bulk gel strength, shearing time, shearing rate, and bulk gel-water ratio on the PDPG particles were systematically analyzed. The morphological results showed that the PDPG particles have a round shape with nano-size to micron-size distribution. The shearing rate is one of the most critical factors in the preparation, while the shearing time and bulk gel strength are secondary factors in preparing the PDPG particles. In addition, the bulk gel-water mixing ratio has a slight impact on the prepared PDPG particles. The PDPG particles had a good shearing resistance and expansion capacity which enhances their application performance in oilfields. Sand pack flowing experiments indicated that PDPG particles can easily enter the in-depth formations and effectively plug high permeability channels. The higher the formation permeability ratio of sand packs, the better the Profile improvement rate. By retention or adsorption in large permeability zones, trapping and bridging across pore throats or large channels, the prepared PDPG particles can effectively improve the formation Profile and divert the following water into low permeability zones, and then the oil is enhanced. The injection of PDPG particles was first successfully applied to Changqing Oilfield in China which provided a reference to Control water production in other similar low permeability mature oilfields.
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experimental study and application of gels formed by nonionic polyacrylamide and phenolic resin for in depth Profile Control
Journal of Petroleum Science and Engineering, 2015Co-Authors: Guang Zhao, Caili Dai, Ang Chen, Zhihu Yan, Mingwei ZhaoAbstract:Abstract A phenolic resin cross-linked nonionic polyacrylamide (NPAM) gel used for in-depth Profile Control was systematically analyzed. Long gelation time and strong gel strength of the gel system was obtained by adjusting NPAM or cross-linker concentration. An increase in temperature and salt concentration accelerated the gelation process and improved the gel strength. Although shearing brings a negative effect on gel performance, the gel system still had strong gel strength which could make it long-term stability in in-depth formation. Differential scanning calorimetry determined that this gel system should be used for oilfield application at temperatures below 143 °C. A compact three-dimensional network structure was formed in the bulk gel system and in porous media which contributed to long-term gel stability in the formation. Sand-pack flow experiments showed that the NPAM gel had a good plugging capacity and could selectively plug high permeability zones. By retention, adsorption, and bridging across the pore throats, the gel systems effectively reduced the permeability of porous media in high permeability zones and diverted fluid into low permeability zones, and thus improved the formation Profile. Furthermore, this gel system for in-depth Profile Control treatment was successfully used in the Xinjiang oilfield of China which provided a reference for other similar high water cut oilfields for water Control worldwide.
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enhanced foam stability by adding comb polymer gel for in depth Profile Control in high temperature reservoirs
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015Co-Authors: Guang Zhao, Caili Dai, Ang Chen, Zhihu Yan, Yanhui Zhang, Mingwei ZhaoAbstract:Abstract A long-term stability of gel enhanced foam as an in-depth Profile Control agent in high temperature reservoirs was successfully prepared by adding comb polymer gel. The increased viscosity of gel brings a negative effect on surface tension which reduces the gel enhanced foam volume. In turn, the increased viscosity could enhance the thickness and strength of foam film which increases foam stability and plugging capacity in porous media. The morphology results show that the gel enhanced foam has a thicker bubble film which enhances its foam stability. The effect of injection mode, gas–liquid ratio, gas injection velocity and formation permeability on the plugging capacity was investigated by single sand-pack experiments. When the gas–liquid ratio and gas injection velocity were respectively set at 1:1 and 0.5 ml/min, co-injection of gel enhanced foaming solution and gas could obtain a better plugging capacity in high permeability sand-packs. Parallel sand-pack experiments show that the Profile improvement capacity of high formation permeability ratio is much better than that of low formation permeability ratio. The visual simulation experiment was also conducted to illustrate the flowing behavior of gel enhanced foam. By Jiamin effect or Jamin superimposed effect, directly plugging and bridging in the large pore space, the gel enhanced foam can effectively reduce the permeability of porous media in high permeability zones and divert fluid into low permeability zones, thus increases the swept volume. The treatment has been successfully used in Henan oilfield of China which provides a reference to water production Control in other similar high temperature oilfields.
E A Lazarus - One of the best experts on this subject based on the ideXlab platform.
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higher fusion power gain with Profile Control in diii d tokamak plasmas
Nuclear Fusion, 1997Co-Authors: E A Lazarus, G A Navratil, C M Greenfield, E J Strait, M E Austin, K H Burrell, T A Casper, D R Baker, J C DebooAbstract:Strong shaping, favourable for stability and improved energy confinement, together with a significant expansion of the central region of improved confinement in negative central magnetic shear target plasmas, increased the maximum fusion power produced in DIII-D by a factor of 3. Using deuterium plasmas, the highest fusion power gain, the ratio of fusion power to input power, Q, was 0.0015, corresponding to an equivalent Q of 0.32 in a deuterium-tritium plasma, which is similar to values achieved in tokamaks of larger size and magnetic field. A simple transformation relating Q to the stability parameters is presented
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higher fusion power gain with current and pressure Profile Control in strongly shaped diii d tokamak plasmas
Physical Review Letters, 1996Co-Authors: E A Lazarus, G A Navratil, C M Greenfield, E J Strait, M E Austin, K H Burrell, T A Casper, D R Baker, J C Deboo, E J DoyleAbstract:Author(s): Lazarus, EA; Navratil, GA; Greenfield, CM; Strait, EJ; Austin, ME; Burrell, KH; Casper, TA; Baker, DR; DeBoo, JC; Doyle, EJ; Durst, R; Ferron, JR; Forest, CB; Gohil, P; Groebner, RJ; Heidbrink, WW; Hong, R; Houlberg, WA; Howald, AW; Hsieh, C; Hyatt, AW; Jackson, GL; Kim, J; Lao, LL; Lasnier, CJ; Leonard, AW; Lohr, J; La Haye RJ; Maingi, R; Miller, RL; Murakami, M; Osborne, TH; Perkins, LJ; Petty, CC; Rettig, CL; Rhodes, TL; Rice, BW; Sabbagh, SA; Schissel, DP; Scoville, JT; Snider, RT; Staebler, GM; Stallard, BW; Stambaugh, RD; St John HE; Stockdale, RE; Taylor, PL; Thomas, DM; Turnbull, AD; Wade, MR; Wood, R; Whyte, D | Abstract: Fusion power has been increased by a factor of 3 in DIII-D by tailoring the pressure Profile to avoid the kink instability in H-mode plasmas. The resulting plasmas are found to have neoclassical ion confinement. This reduction in transport losses in beam-heated plasmas with negative central shear is correlated with a dramatic reduction in density fluctuations. Improved magnetohydrodynamic stability is achieved by Controlling the plasma pressure Profile width. In deuterium plasmas the highest gain Q (the ratio of fusion power to input power), was 0.0015, corresponding to an equivalent Q of 0.32 in a deuterium-tritium plasma. © 1996 The American Physical Society.
Jingna Sun - One of the best experts on this subject based on the ideXlab platform.
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theoretical and experimental research on the law of flexible roll Profile electromagnetic Control
Journal of Materials Processing Technology, 2018Co-Authors: Wenwen Liu, Yanfeng Feng, Tingsong Yang, Jingna SunAbstract:Abstract To obtain a better strip shape, this paper proposes a new micro-scale roll Profile Control technology. According to the principle of the technology, it can be called roll Profile electromagnetic Control technology (RPECT). To achieve multi-point and real-time measurement the Profile of electromagnetic Control roll, the new roll Profile test technology is proposed. Relying on the RPECT and new roll Profile test technology, a φ270 mm×300 mm roll Profile electromagnetic Control experimental platform (RPECEP) is designed and built. An electromagnetic-thermal- mechanical coupled axisymmetric simulation model with the same size is established. Through experiments and simulations, RPECT is confirmed to achieve micro-scale flexible roll Profile adjustment. An all-around comparison of experimental results and calculated results confirms that the new roll Profile test technology is feasible and the calculatde results agree well with the experimental results. Based on the model, the variation of the roll Profile is analysed for different electromagnetic parameters; the structures and positions of the electromagnetic stick, reasonable electromagnetic parameters and optimal time period for the roll Profile Control are determined, and methods for changing the number of roll Profile curves are given.
Guang Zhao - One of the best experts on this subject based on the ideXlab platform.
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novel chemical flooding system based on dispersed particle gel coupling in depth Profile Control and high efficient oil displacement
Energy & Fuels, 2019Co-Authors: Yifei Liu, Chenwei Zou, Daiyu Zhou, Mingwei Gao, Guang Zhao, Caili DaiAbstract:In order to achieve both in-depth Profile Control and high efficient oil displacement, a novel heterogeneous combination flooding system (HCFS) composed of dispersed particle gel (DPG) and dodecyl ...
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dispersed particle gel strengthened polymer surfactant as a novel combination flooding system for enhanced oil recovery
Energy & Fuels, 2018Co-Authors: Guang Zhao, Caili DaiAbstract:A novel dispersed particle gel-strengthened polymer–surfactant (DPS) combination flooding system was proposed and demonstrated for enhanced oil recovery in high water cut mature oilfields. As compared to a conventional polymer–surfactant (PS) combination flooding system, DPS systems have a higher viscosity and a more stable network structure. The polymer is mainly a source of the viscosity, while the surfactant plays a key role in reducing the interfacial tension (IFT). The added dispersed particle gel (DPG) has a synergistic viscosity increase effect, whereas for the DPG particles, the salinity and aging time have a slight effect on the IFT reduction capacity of the DPS system. On the basis of sand-pack flowing experiments, the DPS system has a better mobility Control capacity than the PS system in the combination flooding stage and the following water flooding stage. Parallel sand-pack flowing experiments indicate that injection of a DPS system can effectively improve the Profile Control. The added DPG ...
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preparation and application of a novel phenolic resin dispersed particle gel for in depth Profile Control in low permeability reservoirs
Journal of Petroleum Science and Engineering, 2018Co-Authors: Guang Zhao, Qing You, Jiaping Tao, Hafiz Aziz, Caili DaiAbstract:Abstract Phenolic resin dispersed particle gel (PDPG) was successfully prepared from bulk gel by a mechanical shearing method. The effects of bulk gel strength, shearing time, shearing rate, and bulk gel-water ratio on the PDPG particles were systematically analyzed. The morphological results showed that the PDPG particles have a round shape with nano-size to micron-size distribution. The shearing rate is one of the most critical factors in the preparation, while the shearing time and bulk gel strength are secondary factors in preparing the PDPG particles. In addition, the bulk gel-water mixing ratio has a slight impact on the prepared PDPG particles. The PDPG particles had a good shearing resistance and expansion capacity which enhances their application performance in oilfields. Sand pack flowing experiments indicated that PDPG particles can easily enter the in-depth formations and effectively plug high permeability channels. The higher the formation permeability ratio of sand packs, the better the Profile improvement rate. By retention or adsorption in large permeability zones, trapping and bridging across pore throats or large channels, the prepared PDPG particles can effectively improve the formation Profile and divert the following water into low permeability zones, and then the oil is enhanced. The injection of PDPG particles was first successfully applied to Changqing Oilfield in China which provided a reference to Control water production in other similar low permeability mature oilfields.
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experimental study and application of gels formed by nonionic polyacrylamide and phenolic resin for in depth Profile Control
Journal of Petroleum Science and Engineering, 2015Co-Authors: Guang Zhao, Caili Dai, Ang Chen, Zhihu Yan, Mingwei ZhaoAbstract:Abstract A phenolic resin cross-linked nonionic polyacrylamide (NPAM) gel used for in-depth Profile Control was systematically analyzed. Long gelation time and strong gel strength of the gel system was obtained by adjusting NPAM or cross-linker concentration. An increase in temperature and salt concentration accelerated the gelation process and improved the gel strength. Although shearing brings a negative effect on gel performance, the gel system still had strong gel strength which could make it long-term stability in in-depth formation. Differential scanning calorimetry determined that this gel system should be used for oilfield application at temperatures below 143 °C. A compact three-dimensional network structure was formed in the bulk gel system and in porous media which contributed to long-term gel stability in the formation. Sand-pack flow experiments showed that the NPAM gel had a good plugging capacity and could selectively plug high permeability zones. By retention, adsorption, and bridging across the pore throats, the gel systems effectively reduced the permeability of porous media in high permeability zones and diverted fluid into low permeability zones, and thus improved the formation Profile. Furthermore, this gel system for in-depth Profile Control treatment was successfully used in the Xinjiang oilfield of China which provided a reference for other similar high water cut oilfields for water Control worldwide.
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enhanced foam stability by adding comb polymer gel for in depth Profile Control in high temperature reservoirs
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015Co-Authors: Guang Zhao, Caili Dai, Ang Chen, Zhihu Yan, Yanhui Zhang, Mingwei ZhaoAbstract:Abstract A long-term stability of gel enhanced foam as an in-depth Profile Control agent in high temperature reservoirs was successfully prepared by adding comb polymer gel. The increased viscosity of gel brings a negative effect on surface tension which reduces the gel enhanced foam volume. In turn, the increased viscosity could enhance the thickness and strength of foam film which increases foam stability and plugging capacity in porous media. The morphology results show that the gel enhanced foam has a thicker bubble film which enhances its foam stability. The effect of injection mode, gas–liquid ratio, gas injection velocity and formation permeability on the plugging capacity was investigated by single sand-pack experiments. When the gas–liquid ratio and gas injection velocity were respectively set at 1:1 and 0.5 ml/min, co-injection of gel enhanced foaming solution and gas could obtain a better plugging capacity in high permeability sand-packs. Parallel sand-pack experiments show that the Profile improvement capacity of high formation permeability ratio is much better than that of low formation permeability ratio. The visual simulation experiment was also conducted to illustrate the flowing behavior of gel enhanced foam. By Jiamin effect or Jamin superimposed effect, directly plugging and bridging in the large pore space, the gel enhanced foam can effectively reduce the permeability of porous media in high permeability zones and divert fluid into low permeability zones, thus increases the swept volume. The treatment has been successfully used in Henan oilfield of China which provides a reference to water production Control in other similar high temperature oilfields.
J C Deboo - One of the best experts on this subject based on the ideXlab platform.
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higher fusion power gain with Profile Control in diii d tokamak plasmas
Nuclear Fusion, 1997Co-Authors: E A Lazarus, G A Navratil, C M Greenfield, E J Strait, M E Austin, K H Burrell, T A Casper, D R Baker, J C DebooAbstract:Strong shaping, favourable for stability and improved energy confinement, together with a significant expansion of the central region of improved confinement in negative central magnetic shear target plasmas, increased the maximum fusion power produced in DIII-D by a factor of 3. Using deuterium plasmas, the highest fusion power gain, the ratio of fusion power to input power, Q, was 0.0015, corresponding to an equivalent Q of 0.32 in a deuterium-tritium plasma, which is similar to values achieved in tokamaks of larger size and magnetic field. A simple transformation relating Q to the stability parameters is presented
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higher fusion power gain with current and pressure Profile Control in strongly shaped diii d tokamak plasmas
Physical Review Letters, 1996Co-Authors: E A Lazarus, G A Navratil, C M Greenfield, E J Strait, M E Austin, K H Burrell, T A Casper, D R Baker, J C Deboo, E J DoyleAbstract:Author(s): Lazarus, EA; Navratil, GA; Greenfield, CM; Strait, EJ; Austin, ME; Burrell, KH; Casper, TA; Baker, DR; DeBoo, JC; Doyle, EJ; Durst, R; Ferron, JR; Forest, CB; Gohil, P; Groebner, RJ; Heidbrink, WW; Hong, R; Houlberg, WA; Howald, AW; Hsieh, C; Hyatt, AW; Jackson, GL; Kim, J; Lao, LL; Lasnier, CJ; Leonard, AW; Lohr, J; La Haye RJ; Maingi, R; Miller, RL; Murakami, M; Osborne, TH; Perkins, LJ; Petty, CC; Rettig, CL; Rhodes, TL; Rice, BW; Sabbagh, SA; Schissel, DP; Scoville, JT; Snider, RT; Staebler, GM; Stallard, BW; Stambaugh, RD; St John HE; Stockdale, RE; Taylor, PL; Thomas, DM; Turnbull, AD; Wade, MR; Wood, R; Whyte, D | Abstract: Fusion power has been increased by a factor of 3 in DIII-D by tailoring the pressure Profile to avoid the kink instability in H-mode plasmas. The resulting plasmas are found to have neoclassical ion confinement. This reduction in transport losses in beam-heated plasmas with negative central shear is correlated with a dramatic reduction in density fluctuations. Improved magnetohydrodynamic stability is achieved by Controlling the plasma pressure Profile width. In deuterium plasmas the highest gain Q (the ratio of fusion power to input power), was 0.0015, corresponding to an equivalent Q of 0.32 in a deuterium-tritium plasma. © 1996 The American Physical Society.
