New chemical prevention-control integrated technology for elemental sulfur deposition in surface gathering and transportation systems of high-sulfur gas fields
New chemical prevention-control integrated technology for elemental sulfur deposition in surface gathering and transportation systems of high-sulfur gas fields
With the continuous development of high-sulfur gas fields,elemental sulfur deposition blockage is inevitable in the surface gathering and transportation systems of gas fields.The process of stopping the production and employing sulfur solvent immersion for cyclic cleaning and blockage removal is faced with the challenges of short stable production cycle,frequent cleaning and high comprehensive treatment cost.Based on the concept of chemical prevention-treatment integration,this paper studies the off-production sulfur solvent immersion for cyclic blockage removal technology and the on-production on-line sulfur solvent injection for blockage prevention technology respectively,performs formula design,verification and field test,and puts forward prevention-control integrated plan.The following results are obtained.First,the serotonin based efficient sulfur solvent(CTS-1)has the optimal operating temperature of 40-60 ℃,the optimal cleaning time of 1-2 h,and the saturated dissolved sulfur content of 45.72 g/100 mL,indicating a significantly improved sulfur dissolution capacity,and it has the advantages of weak pungent smell,slight toxicity and low corrosion.It has been successfully applied in the sulfur dissolution and removal in Well LJ11H of Luojiazhai Gas Field in the Sichuan Basin.Second,the technical idea of on-production on-line sulfur solvent injection for elemental sulfur blockage prevention is put forward innovatively,the"dynamic prevention-real time dissolution"mechanism of on-line sulfur solvent injection is clarified,and the application process plan of on-line sulfur solvent injection is prepared specifically.Third,the composite alkali based sulfur solvent(CTS-2)technology reduces the effective sulfur dissolution time significantly to 15-20 min while ensuring the high sulfur dissolution capacity,and exhibits good adaptability and environmental friendliness.In conclusion,the chemical prevention-control integrated technology can effectively solve the elemental sulfur deposition blockage in the surface gathering systems of high-sulfur gas fields,and the newly developed serotonin based sulfur solvent and the composite alkali based sulfur solvent can meet the technical needs of chemical prevention and control.What's more,in the next step,it is necessaiy to carry out systematical researches on integrated prevention and control of wellbore and surface cleaning,on-line chemical injection for blockage prevention,and chemical recycling,so as to realize the long-term prevention and control of elemental sulfur deposition in the surface gathering and transportation systems of high-sulfur gas fields,and assist the long-term stable production and large-scale efficient development of high-sulfur gas fields.
关键词
高含硫气田/元素硫沉积/化学防治/一体化技术/在线加注/硫溶剂
Key words
High-sulfur gas field/Elemental sulfur deposition/Chemical prevention and control/Integrated technology/On-line injection/Sulfur solvent
维普
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