普光气田气井硫堵动态特征及治理对策研究

doi:10.11885/j.issn.1674-5086.2022.02.03.01

摘要/Abstract

摘要： 普光气田属于特高含H₂S气田，随着气田的开发，地层压力逐渐降低，单质硫逐渐从天然气中析出，附着沉积在地面设备、集输管线以及油管内壁，造成硫沉积堵塞。目前，普光气田地面集输流程和井筒均已出现硫沉积与堵塞，严重影响气井正常生产。针对气井硫沉积堵塞动态特征不清，缺乏相应的硫堵治理对策的难题，首先，开展单质硫在天然气中的含量实验研究，明确了原始地层条件下天然气中单质硫的含量，不同压力和温度条件下的单质硫饱和溶解度；其次，研究了地面流程硫沉积堵塞和井筒硫沉积堵塞的动态特征及变化规律，提出了地面硫堵和井筒硫堵的治理对策，评价了各类措施的效果及现场适应性；最后，根据理论研究及现场实践，分析认为硫堵会逐渐发展到储层，前瞻性地提出了储层解硫堵的对策。研究成果对高含硫气井的地面-井筒-储层硫堵综合治理具有很强的指导意义。

关键词: 高含硫, 硫沉积, 硫堵, 地面, 井筒, 储层, 对策

Abstract: Puguang Gas Field is an extremely high sulfur hydrogen gas field. With the development of the gas field, the formation pressure is gradually reduced, the elemental sulfur is gradually separated from the natural gas and deposited on the surface equipment, the gathering and transporting pipelines and on the inner wall of the oil pipeline, which gradually causes the sulfur deposition blockage. At present, sulfur deposition and plugging have occurred in the surface gathering and transportation process and wellbore of Puguang Gas Field, which seriously affects the normal production of gas wells. Aiming at the problem that the dynamic characteristics of sulfur deposition and plugging in gas wells are not clear and the corresponding countermeasures are not available, the mechanism of sulfur plugging in gas wells is studied first. We find that the elemental sulfur is gradually precipitated, then transported and deposited, and finally formed a sulfur plug. Secondly, the dynamic characteristics and changing rules of sulfur deposition plugging in surface flow and wellbore are analyzed, the corresponding countermeasures of sulfur deposition plugging in surface and wellbore are proposed, and the field adaptability of various measures was evaluated. Finally, according to the theoretical research and field practice, it is considered that sulfur plugging will gradually develop to the reservoir, and the countermeasures of sulfur plugging removal are proposed. The research results have a guiding significance for comprehensive control of surface-wellbore-reservoir sulfur shutoff in high sulfur gas wells.

Key words: high sulfur content, sulfur deposition, sulfur plugging, ground, wellbore, reservoir, countermeasures

中图分类号:

TE349

付德奎. 普光气田气井硫堵动态特征及治理对策研究[J]. 西南石油大学学报(自然科学版), 2023, 45(5): 119-130.

FU Dekui. Dynamic Characteristics and Countermeasures of Sulfur Plugging in Gas Wells of Puguang Gas Field[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(5): 119-130.

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