Fine quantitative characterization of high-H2S gas reservoirs under the influence of liquid sulfur deposition and adsorption

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外文摘要：In order to clarify the influence of liquid sulfur deposition and adsorption to high-H2S gas reservoirs,three types of natural cores with typical carbonate pore structures were selected for high-temperature and high-pressure core displacement experiments.Fine quantitative characterization of the cores in three steady states(original,after sulfur injection,and after gas flooding)was carried out using the nuclear magnetic resonance(NMR)transverse relaxation time spectrum and imaging,X-ray computer tomography(CT)of full-diameter cores,basic physical property testing,and field emission scanning electron mi-croscopy imaging.The loss of pore volume caused by sulfur deposition and adsorption mainly comes from the medium and large pores with sizes bigger than 1 000 μm.Liquid sulfur has a stronger adsorption and deposition ability in smaller pore spaces,and causes greater damage to reservoirs with poor original pore structures.The pore structure of the three types of carbonate reservoirs shows multiple fractal characteristics.The worse the pore structure,the greater the change of internal pore distribution caused by liquid sulfur deposition and adsorption,and the stronger the heterogeneity.Liquid sulfur deposi-tion and adsorption change the pore size distribution,pore connectivity,and heterogeneity of the rock,which further changes the physical properties of the reservoir.After sulfur injection and gas flooding,the permeability of Type I reservoirs with good physical properties decreased by 16%,and that of Types II and III reservoirs with poor physical properties decreased by 90%or more,suggesting an extremely high damage.This indicates that the worse the initial physical properties,the greater the dam-age of liquid sulfur deposition and adsorption.Liquid sulfur is adsorbed and deposited in different types of pore space in the forms of flocculence,cobweb,or retinitis,causing different changes in the pore structure and physical property of the reservoir.

外文关键词：

high-H2S gas reservoirliquid sulfuradsorption and depositionpore structurephysical propertyreservoir characterization

作者：

LI Tong、MA Yongsheng、ZENG Daqian、LI Qian、ZHAO Guang、SUN Ning

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作者单位：

School of Earth and Space Science,Peking University,Beijing 100871,China

Sinopec Petroleum Exploration and Production Research Institute,Beijing 102206,China

China Petrochemical Corporation,Beijing 100728,China

SINOPEC Petroleum Exploration and Production Research Institute,Beijing 102206,China

School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China

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出版年：

2024

DOI：

10.1016/S1876-3804(24)60033-9

石油勘探与开发(英文)

中国石油天然气股份有限公司勘探开发研究院中国石油集团科学技术研究院

石油勘探与开发(英文)

ISSN：2096-4803

年,卷(期)：2024.51(2)