PAM-AA水凝胶体系中甲烷水合物生成过程的实验研究

Experimental study on formation process of methane hydrate in PAM-AA hydrogel system

师浩林 徐加放 陈杰 杨晓龙 丁廷稷

SHI Haolin XU Jiafang CHEN Jie YANG Xiaolong DING Tingji

中国石油大学(华东)石油工程学院 非常规油气开发教育部重点实验室·中国石油大学(华东)

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China Key Laboratory of Unconventional Oil and Gas Development, Ministry of Education, Qingdao 266580, Shandong, China

作为储量巨大的清洁能源和应用广泛的工业原料，天然气水合物越来越多地受到学者和工业界的关注。实验研究了含聚丙烯酰胺-丙烯酸（PAM-AA）盐溶液中甲烷水合物在反应釜中的生成过程，揭示了PAM-AA水凝胶体系对生成甲烷水合物的作用。结果表明：2 ℃、8 MPa时，水凝胶体系促进甲烷水合物生成；2 ℃、4.5 MPa时，水凝胶体系抑制甲烷水合物生成；PAM-AA水凝胶体系能够扰乱甲烷水合物的正常生成，表现为缩短甲烷水合物大量生成的时间（促进）和阻碍气液间的传质（抑制）；实验生成的甲烷水合物形态分为两种，即疏松且含有大量孔隙或坚硬且致密，分别对应抑制/促进甲烷水合物生成的体系。通过探究PAM-AA水凝胶体系中甲烷水合物的生成过程，能够为工业领域内甲烷水合物的生成、防治、储存和运输提供借鉴。

As a clean energy with huge reserves and a widely used industrial raw material, natural gas hydrate has attracted more and more attention from scholars and industry. The formation process of methane hydrate in the reactor containing polyacrylamide-acrylic acid (PAM-AA) salt solution was experimentally studied, and the effect of PAM-AA hydrogel system on the formation of methane hydrate was revealed. The results show that the hydrogel system promotes the formation of methane hydrate at 2 ℃ and 8 MPa; the hydrogel system inhibits the formation of methane hydrate at 2 ℃ and 4.5 MPa; the PAM-AA hydrogel system can disrupt the normal formation of methane hydrate, manifesting as shortening the time for massive formation of methane hydrate (promoting) and hindering mass transfer between gas and liquid (inhibiting); the experimentally generated methane hydrate forms are divided into two types, namely loose and containing a lot of pores or hard and dense, which correspond to the systems that inhibit/promote the formation of methane hydrate, respectively. Exploring the generation process of methane hydrate in the PAM-AA hydrogel system can provide a reference for the generation, prevention, storage, and transportation of methane hydrate in industrial field.

10.13639/j.odpt.2022.03.014