班凡生. 盐穴储气库造腔技术现状与发展趋势[J]. 油气储运, 2017, 36(7): 754-758. DOI: 10.6047/j.issn.1000-8241.2017.07.002
引用本文: 班凡生. 盐穴储气库造腔技术现状与发展趋势[J]. 油气储运, 2017, 36(7): 754-758. DOI: 10.6047/j.issn.1000-8241.2017.07.002
BAN Fansheng. Status and development trend of solution mining technologies used for salt-cavern gas storage[J]. Oil & Gas Storage and Transportation, 2017, 36(7): 754-758. DOI: 10.6047/j.issn.1000-8241.2017.07.002
Citation: BAN Fansheng. Status and development trend of solution mining technologies used for salt-cavern gas storage[J]. Oil & Gas Storage and Transportation, 2017, 36(7): 754-758. DOI: 10.6047/j.issn.1000-8241.2017.07.002

盐穴储气库造腔技术现状与发展趋势

Status and development trend of solution mining technologies used for salt-cavern gas storage

  • 摘要: 针对盐穴储气库,中国采用以正循环为主的单井对流法造腔,造腔速度慢,建造20×104 m3腔体需要4~5年,且单一的造腔方式很难适应国内地下储气库快速发展的需求,因此需要寻求多种适应中国层状盐层建库的造腔方式,提高造腔速度。基于数值计算及现场应用,阐述分析了各种造腔方式的过程和优缺点,以及反循环造腔、大井眼造腔、双井造腔、双管柱造腔的提速原因。研究表明:反循环造腔、大井眼造腔、双井造腔、双管柱造腔是盐穴储气库造腔技术发展的主要趋势,可有效提高造腔速度。大井眼、双井以及双管柱造腔存在不足及难点,许多关键技术需要进一步攻关。大井眼固井难度大,双井造腔腔体控制及检测难,双管柱造腔过程中生产套管易受卤水腐蚀。反循环造腔技术已在金坛地区成功应用,造腔控制及检测技术较成熟,盐穴造腔速度能够提高20%以上,可有效推进中国储气库建设进程。

     

    Abstract: As for salt-cavern gas storage, positive circulation dominated single well convection method is used for cavern building in China. The solution mining speed is low, and it takes 4-5 years to build a cavern of 20×104 m3. It is difficult to meet the requirement on rapid development of underground gas storage (UGS) in China by using only a single solution mining method. Therefore, it is necessary to search for many solution mining methods suitable for UGS building in layered salt beds to increase solution mining speed. In this paper, the process and advantages & disadvantages of various solution mining modes were illustrated and analyzed based on numerical calculation and field application. And then, the causes to increase solution mining speed were analyzed on reverse-circulation, big-hole, twin-well and dual-string solution mining technologies. It is shown that the development trend of solution mining technologies for salt-cavern gas storage are mainly reverse-circulation, big-hole, twin-well and dual-string solution mining technologies, which can increase solution mining speed effectively. There are some disadvantages and difficulties in big-hole, twin-well and dual-string solution mining technologies and many key technologies shall be studied further. The difficulties of big-hole solution mining, twin-well solution mining and dual-string solution mining are well cementing, cavity control and detection, and brine corrosion to production casing, respectively. The reverse-circulation solution mining technology has been successfully applied in Jintan area. Cavity control and detection technologies are relatively mature, and solution mining speed can be increased by more than 20%. By virtue of this technology, domestic UGS building process is impelled effectively.

     

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