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Experimental investigation on using CO_(2)/H_(2)O emulsion with high water cut in enhanced oil recovery

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Petroleum Science 2024年第2期21卷 974-986页

作者： Xi-Dao Wu Peng Xiao Bei Liu guang-jin chen Jian-Hua Pang State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Ocean Intelligence Technology Center Shenzhen Institute of Guangdong Ocean UniversityShenzhen518120GuangdongChina

CO_(2) emulsions used for EOR have received a lot of interest because of its good performance on CO_(2)mobility ***,most of them have been focusing on the high quality CO_(2) emulsion(high CO_(2) fraction),while CO_(2) emulsion with high water cut has been rarely *** this paper,we carried out a comprehensive experimental study of using high water cut CO_(2)/H_(2)O emulsion for enhancing oil ***,a nonionic surfactant,alkyl glycosides(APG),was selected to stabilize CO_(2)/H_(2)O emulsion,and the corresponding morphology and stability were evaluated with a transparent PVT ***,plugging capacity and apparent viscosity of CO_(2)/H_(2)O emulsion were measured systematically by a sand pack displacement apparatus connected with a 1.95-m long capillary ***,a high water cut(40 vol%) CO_(2)/H_(2)O emulsion was selected for flooding experiments in a long sand pack and a core sample,and the oil recovery,the rate of oil recovery,and the pressure gradients were *** results indicated that APG had a good performance on emulsifying and stabilizing CO_(2) *** inversion from H_(2)O/CO_(2) emulsion to CO_(2)/H_(2)O emulsion with the increase in water cut was ***_(2)/H_(2)O emulsions with lower water cuts presented higher apparent viscosity,while the optimal plugging capacity of CO_(2)/H_(2)O emulsion occurred at a certain water ***,the displacement using CO_(2)/H_(2)O emulsion provided 18.98% and 13.36% additional oil recovery than that using pure CO_(2) in long sand pack and core tests,*** work may provide guidelines for EOR using CO_(2) emulsions with high water cut.

关键词： CO_(2)/H_(2)O emulsion High water cut CO_(2) mobility control Enhanced oil recovery

Self-adaptive gas flow and phase change behaviors during hydrate exploitation by alternate injection of N_(2) and CO_(2)

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Petroleum Science 2024年第3期21卷 2120-2129页

作者： Bo-Jian Cao Yi-Fei Sun Hong-Nan chen jin-Rong Zhong Ming-Long Wang Ming Wang Chang-Yu Sun guang-jin chen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China School of Chemistry and Chemical Engineering Changsha University of Science&TechnologyChangsha410114HunanChina

Since hydrate resources play a part of the stratigraphic framework structure in sediments,establishing a safe and economic method for hydrates exploitation remains the primary challenge to this *** the proposed methods,the spontaneous displacement of CH_(4) from hydrate cages by CO_(2) seems to be a perfect mechanism to address gas production and CO_(2) storage,especially in today's strong demand for carbon reduction and replacing clean *** extensive lab researches,in the past decade,injecting a mixture of CO_(2) and small molecule gas has become a key means to enhance displacement efficiency and has great potential for ***,there is a lack of in-depth research on gas flow in the reservoir,while the injected gas always passes through low-saturated hydrate areas with high permeability and then occurs gas channel in a short term,finally resulting in the decreases in gas production efficiency and produced gas ***,we explored a new injection-production mode of alternate injection of N2 and CO_(2) in order to fully coordinate the advantages of N_(2) in enhanced hydrate decomposition and CO_(2) in solid storage and heat *** alternate"taking"and"storing"processes perfectly repair the problem of the gas channel,achieving self-regulation effect of CH_(4) recovery and CO_(2) *** 3-D experimental results show that compared to the mixed gas injection,CH_(4) recovery is increased by>50%and CO_(2) storage is increased by>70%.Additionally,this alternate injection mode presented a better performance in CH_(4) concentration of produced gas and showed outstanding N_(2) utilization ***,we analyzed its self-adaptive gas flow mechanism and proposed an application model of"one injection and multiple production".We look forward to this study accelerating the application of CO_(2)-CH_(4) replacement technology.

关键词： Hydrate Replacement CH_(4)recovery CO_(2)storage Reservoir remediation

Microscopic experimental study on the effects of NaCl concentration on the self-preservation effect of methane hydrates under 268.15 K

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Chinese Journal of Chemical Engineering 2024年第9期73卷 1-14页

作者： Yu-Jie Zhu Yu-Zhou chen Yan Xie jin-Rong Zhong Xiao-Hui Wang Peng Xiao Yi-Fei Sun Chang-Yu Sun guang-jin chen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Research Centre of Ecology&Environment for Coastal Area and Deep Sea Guangdong University of TechnologyGuangzhou 510006China School of Chemistry and Food Engineering Changsha University of Science and TechnologyChangsha 410114China

It is known that salt ions are abundant in the natural environment where natural gas hydrates are located;thus,it is essential to investigate the self-preservation effect of salt ions on methane *** dissociation behaviors of gas hydrates formed from various NaCl concentration solutions in a quartz sand system at 268.15 K were investigated to reveal the microscopic mechanism of the self-preservation effect under different salt *** showed that as the salt concentration rises,the initial rate of hydrate decomposition *** hydrate hardly shows self-preservation ability in the 3.35%(mass)NaCl and seawater systems at 268.15 *** the morphology of hydrate observed by the confocal microscope with results obtained from in situ Raman spectroscopy,it was found that during the initial decomposition stage of gas hydrate below the ice point,gas hydrate firstly converts into liquid water and gas molecules,then turns from water to solid ice rather than directly transforming into solid ice and gas *** presence of salt ions interferes with the ability of liquid water to condense into solid *** results of this study provide an important guide for the mechanism and application of the self-preservation effect on the storage and transport of gas and the exploitation of natural gas hydrates.

关键词： Gas hydrate Self-preservation Salinity In situ Raman spectroscopy Endothermic behavior Dissociation

Influences of pore fluid on gas production from hydrate-bearing reservoir by depressurization

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Petroleum Science 2023年第2期20卷 1238-1246页

作者： Yi-Fei Sun Bo-Jian Cao Hong-Nan chen Yin-Long Liu jin-Rong Zhong Liang-Liang Ren guang-jin chen Chang-Yu Sun Dao-Yi chen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Division of Ocean Science and Technology Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenGuangdong 518055China School of Chemistry and Food Engineering Changsha University of Science&TechnologyChangshaHunan 410114China Oilfield Chemicals R&D Institute COSLHebei 065201China

In addition to the temperature and pressure conditions,the pore fluid composition and migration behavior are also crucial to control hydrate decomposition in the exploitation *** this work,to investigate the effects of these factors,a series of depressurization experiments were carried out in a visible one-dimensional reactor,using hydrate reservoir samples with water saturations ranging from 20%to 65%.The results showed a linear relationship between gas production rates and gas saturations of the reservoir,suggesting that a larger gas-phase space was conducive to hydrate decomposition and gas ***,the rapid water production in the early stage of hydrate exploitation could release more gas-phase space in the water-rich reservoir,which in turn improved the gas production ***,the spatiotemporal evolution of pore fluids could lead to partial accelerated decomposition or secondary formation of *** the unsealed reservoir,the peripheral water infiltration kept reservoir at a high water saturation,which hindered the overall production process and caused higher water ***,depressurization assisted with the N2 sweep could displace the pore water *** to the results,it is recommended that using the short-term N2 sweep as an auxiliary means in the early stage of depressurization to expand the gas-phase space in order to achieve the highest production efficiency.

关键词： CH4 hydrate Water saturation Depressurization Gas-phase space N2 sweep

A rare case of periampullary carcinoma with ectopic ending of Vater's ampulla

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World Journal of Gastroenterology 2009年第37期15卷 4729-4731页

作者： Shu-guang jin Zhe-Yu chen Lu-Nan Yan Yong Zeng Wei Huang Nan Xu Department of Hepato-Bilio-Pancreatic Surgery West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China

A 71-year-old woman was referred to our department complaining of painless progressive jaundice for the last 3 too. Magnetic resonance imaging and magnetic resonance cholangiopancreatography （MRCP） showed the ectopic hepatopancreatic ampulla draining into the fourth part of the duodenum adjacent to the duodenojejunal flexure; the irregular morphology of the duodenojejunal flexure likely due to a soft tissue mass. Laparotomy confirmed the presence of the abnormal ampulla of Vater located at the fourth part of the duodenum and a soft tissue tumor about 6 cm × 5 cm×5 cm with a peduncle adjoining the ampulla. Resection of the tumor, including some peripheral tissue, and a Roux-Y loop anastomosis choledochojejunostomy were performed. Pathological examination indicated an intestinal villous adenoma accompanied by severe dysplasia and focal canceration. Periampullary carcinoma with ectopic ending of the Vater＇s ampulla into the fourth part of the duodenum is rather rare. The embryonic genetic background of this anomaly has not yet been fully explained. It is worth mentioning that MRCP is useful for demonstrating anomalies and anatomic variants of the biliary tract system and pancreatic duct.

关键词： Ectopia, Ampulla of Vater, Periampullary carcinoma Magnetic resonance cholangiopancreatography Treatment

Acoustic characterization of hydrate formation and decomposition in clay-bearing sediments

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Petroleum Science 2024年第4期21卷 2830-2838页

作者： Yi-Jian Zhu Xiao-Mei Yang Xing Huang Hao Li Xiao-Hui Wang Yi-Fei Sun Peng Xiao Chang-Yu Sun guang-jin chen State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing102249China

Understanding the acoustic characteristics of hydrates in various sediments is crucial for hydrate resource detection and safe and efficient exploitation,as hydrate occurrence patterns vary greatly in different *** this work,sediments with different bentonite contents,water saturations,and types were prepared to investigate the characteristics of P-wave velocity(reflecting the magnitude of hydrate saturation in the sediment)and amplitude(reflecting the degree of hydrate-sediment cementation)during hydrate formation and *** hydrate formation,the P-wave velocity and amplitude have similar *** clay content increases,the P-wave velocity increase rates *** the other hand,the increased rate of P-wave velocity slows down with the increase of water saturation in the clay-bearing *** various types of sediment shows that the water absorption and swelling of bentonite reduce the pore space,speeding up the cementation of the hydrate with the sediment and increasing P-wave velocity at a faster *** between P-wave velocity and hydrate saturation is strongly related to sediment type,clay content,and water *** rapidly decreasing amplitude in the early stage of hydrate depressurization indicates that hydrate in clay-bearing sediments is weakly cemented to the sediments,which is prone to stratigraphic *** findings of this study offer guidance for hydrate resource assessments in clay-bearing sediments as well as geologic risk estimations during hydrate mining.

关键词： Gas hydrate Bentonite Illite P-wave velocity Amplitude

Acupuncture on Gnosia and Acetylcholinesterase in Senile Dementia Patients

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Journal of Acupuncture and Tuina Science 2003年第1期1卷 25-27页

作者： TANG Yong YU Shu-guang chen jin ZHANG Wei chengdu University of Traditional Chinese Medicine Sichuan 610075 China Chengdu University of Traditional Chinese Medicine Sichuan 610075 China Chengdu University of Traditional Chinese Medicine Sichuan 610075 China Chengdu University of Traditional Chinese Medicine Sichuan 610075 China

Purpose To observe the effect of acupuncture on gnosia and acetylcholinesterase in patients with senile *** Eight patients diagnosed with mild or moderate senile dementia were treated by acupuncture of Sishencong (Ex-HN 1), Shenmen (HT 7) and Taixi (Kl 3) for 1 month; gnosia was evaluated by Mini-mental state examination before and after the treatment; plasma acetylcholin esterase activity was measured by fluorier before and after the *** There was a significant difference in gnosia between pre- and post-treatment with acupuncture (P0.05).Conclusion Acupuncture has a certain improving effect on gnosia in senile dementia; one month’s acupuncture treatment had little effect on plasma acetyl-cholinesterase activity. Key Words Dementia, Senile - Acupuncture therapy - Gnosia Author: Tang Yong (1974-), male, attending physician and doctor

关键词： Dementia, Senile Acupuncture therapy Gnosia

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裂纹转子的振动特性与裂纹参数识别

上海交通大学学报 2004年第6期38卷 857-861页

作者：董广明陈进邹剑上海交通大学振动冲击噪声国家重点实验室上海200030

基于Euler-Bernoulli理论和局部柔度理论,给出了停机状态单一开裂纹转子的连续模型.数值仿真研究了裂纹深度和裂纹位置对转子固有频率以及振型的影响,并提出了利用固有频率和振型识别裂纹参数的方法,仿真算例验证了该方法的有效性和可行性.

关键词：裂纹转子开裂纹连续模型振动分析裂纹参数识别

法律方法论学科的拓展——2016年中国法律方法论研究报告

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山东大学学报（哲学社会科学版） 2017年第5期 141-151页

作者：孙光宁陈金钊山东大学(威海)法学院华东政法大学法律方法研究院

在建设"双一流"背景之下,法律方法论作为一个独立法学分支学科的属性日益提升,2016年度的丰硕成果能够作为佐证。在理论基础方面,法律方法论不仅探究了以法教义学为代表的历史渊源,还持续关注了法治建设的重大现实问题。在法律方法论的... 详细信息

在建设"双一流"背景之下,法律方法论作为一个独立法学分支学科的属性日益提升,2016年度的丰硕成果能够作为佐证。在理论基础方面,法律方法论不仅探究了以法教义学为代表的历史渊源,还持续关注了法治建设的重大现实问题。在法律方法论的分支学科中,法律解释学强调了制度完善和综合解释方法的运用;法律论证理论仍然凸显着法律修辞的研究成果,并继续与中国法治特点相结合;法律逻辑学强调了作为方法论的形式逻辑。在部门法方法论的研究中,突出的特点是行政法方法论产生了较多成果。基础理论和分支学科的提升与完善,都充实着法律方法论作为独立学科的地位。

关键词：法律方法论法律解释学法律修辞学法律逻辑学法教义学