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The first extra-large helium-rich gas field identified in a tight sandstone of the Dongsheng gas Field,Ordos Basin,China

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Science China Earth Sciences 2022年第5期65卷 874-881页

作者： Weilong PENG Quanyou LIU Ying ZHANG Huichong JIA Dongya ZHU Qingqiang MENG Xiaoqi WU Shang DENG Yongsheng MA State Key Laboratory of Shale Oil and gas Enrichment Mechanisms and Effective Development Beijing 100083China Petroleum Exploration and Production Research Institute SINOPECBeijing 100083China Exploration and Production Research Institute SINOPEC North China BranchZhengzhou 450006China Ma Yongsheng’s Laboratory Beijing 100083China SINOPEC Company Limited Beijing 100728China

helium gas is a scarce but important strategic resource,which is usually associated with natural gas.Presently,only one extra-large helium-rich gas field has been found in China:the Hetianhe gas Field in the Tarim Basin.This paper reports a new example,the Dongsheng gas Field(DGF)in the Ordos Basin.In this study,92 natural gas samples from the DGF were analyzed for helium content and isotope composition using isotope mass spectrometry.The natural gas samples were found to have an average helium content of 0.133%,with 65(70.7%)of the samples having a helium content of 0.1%or more.Based on the proven natural gas reserves of the DGF,the proven geological helium reserves were calculated to be 1.96×10^(8)m^(3),suggesting that it represents the first extra-large helium-rich natural gas reservoir to be hosted in tight sandstone in China.The ^(3)He/^(4)He ratios of 5 natural gas samples from the DGF are within the range of 3.03×10^(−8)–3.44×10^(−8).Therefore,the helium in the gas field is thought to be of typical crustal origin and to have formed in the granitic basement that is rich in uranium and thorium.The accumulation of helium-rich natural gas was controlled by regional tectonic activities.Activity along the fault connecting the reservoir with the basement caused release of the helium gas,which entered the overlying strata along the fault and accumulated with conventional hydrocarbon gas.Based on the structural background and the distribution of helium source rocks in the Ordos Basin,the main helium source rocks with high exploration potential are located in deep strata within the north and middle parts of the basin.

关键词： helium gas Granitic basement Radiogenesis Dongsheng gas Field Ordos Basin

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Unsteady numerical simulation on helium cooldown process for the 650 MHz two-cell superconducting cavity

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Radiation Detection Technology and Methods 2019年第4期3卷 18-28页

作者： Mei Li Zhengze Chang Shaopeng Li Rui Ge Institution of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Laboratory of Partical Acceleration Physics and Technology CASBeijing 100049China Center for Superconducting RF and Cryogenics Institution of High Energy PhysicsBeijingChina

Background Superconducting cavity is usually needed to be gradually cooled from room temperature to the superconducting temperature zone(4.2 K and below)in the testing and sophisticated operation process of superconducting cavity.Purpose The purpose of this paper is to study the cooling law on the helium cooldown process for the 650 MHz two-cell superconducting cavity with the unsteady numerical simulation.Method A three-dimensional coupled heat-flow model of 650 MHz two-cell superconducting cavity was established.The unsteady numerical simulation of different inlet temperatures,flow rates and pressure conditions was carried out.The equiva-lent convective heat transfer coefficient and temperature distribution of 650 MHz two-cell superconducting cavity during cooldown process were obtained.The effects of cooling time and entrance parameters on the cooldown process were analyzed.Results The temperature distribution of the lower intersection lines has a large drop in the initial stage of cooldown process(120 s),while the temperature near the flanges at the both ends is still higher(remaining at the initial temperature of 300 K).With the passage of time,the temperature of the upper and lower intersection lines decreases.The maximum temperature difference on the lower intersections is within 2 K in the final stage of cooldown process(3600 s).The maximum temperature difference increases by 180%,and the difference between the maximum temperature and the minimum temperature(dT)at the end of a cooldown stage increases by 130%after 1 h,respectively,when the inlet temperature drops from 290 to 270 K(under the condition of the initial temperature of 300 K).Conclusions The maximum temperature difference and the dT at the end of a cooldown stage increase with the decrease in the inlet temperature.The maximum temperature difference increases with the increase in the inlet flow rate,while the dT at the end of a cooldown stage decreases with the increase in the inlet flow rate.The effect of changing the inlet flow rate on the coo

关键词： Accelerator Superconducting cavity helium gas Cooldown process Unsteady numerical simulation

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