高含硫气井罐装电潜泵系统排水采气工艺

为了将常规气井常用的电潜泵排水采气工艺应用于高含硫气井,同时满足高含硫气井保护套管的要求,基于高含硫气井的完井方式及电潜泵排水采气工艺自身的技术特点,针对套管保护、气体干扰及深井电潜泵机组振动等问题,在完井管柱设计、工具配套等方面开展了攻关研究,并在L2井进行了排水采气工艺设计。结果表明:(1)所研发的一套以罐装电潜泵系统为主体、结合锚定式插管封隔器形成的高含硫气井完井管柱系统能够实现电潜泵的正常运行,并且满足保护套管的要求;(2)采用多相流泵及放气管线可以应对气体干扰的问题,使用自动换向阀可以降低电潜泵复杂流道对气井自喷的影响,配套带锚定机构的插管封隔器能够降低管柱振动;(3)所设计的罐装电潜泵系统可应用于?244.5 mm和?177.8 mm套管,其中?244.5 mm套管对应的电潜泵最大排量为900 m3/d、最高扬程为4 500 m;?177.8 mm套管对应的电潜泵最大排量为300 m3/d、最高扬程为3 000 m。结论认为,该项研究成果为高含硫气井实施电潜泵排水采气工艺提供了技术支撑。

Drainage gas recovery technology based on canned ESP system of high-sulfur gas wells

In order to apply the electric submersible pump (ESP) based drainage gas recovery technology that is commonly used in conventional gas wells to high-sulfur gas wells, and meet the requirements on casing protection of high-sulfur gas wells, we conducted a series of technical researches on casing protection, gas interference and vibration of deep-well ESP set in terms of a completion string design and support tools based on the completion modes of high-sulfur gas wells and the technical characteristics of ESP drainage gas recovery technologies. And the research results were used in the design of Well L2 drainage gas recovery. The following research results were obtained. First, the completion string system of high-sulfur gas wells is developed with a canned ESP system as the main part, combined with the anchor intubation packer. By virtue of this system, the normal operation of ESP is guaranteed and the requirements on casing protection are satisfied. Second, gas interference can be dealt with using multi-phase pump and gas venting pipes, the effect of an ESP complex flow path on the gas flowing of gas wells can be diminished by means of an automatic reverse valve, and the string vibration can be reduced using an intubation packer equipped with an anchor mechanism. Third, the canned ESP system designed in this paper is applicable to Ø244.5 mm and Ø177.8 mm casings. And the ESP corresponding to Ø244.5 mm casing has the maximum flow rate of 900 m3/d and the maximum lift height of 4 500 m, and that corresponding to Ø177.8 mm casing has the maximum flow rate of 300 m3/d and the maximum lift height of 3 000 m. It is concluded that this research result provides a technical support for the implementation of ESP based drainage gas recovery technology in high-sulfur gas wells.