Reasonable Diameter Selection of Production String for Puguang Gas Well with High H2S
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摘要: 普光气田高含硫气井在生产过程中会出现硫沉积、冲蚀、积液和形成水合物等问题,如果生产管柱管径合理可以延缓或避免出现这些问题。为此,针对普光气田高含硫气井的生产特点,以现有生产管柱优选方法为基础,通过分析高含硫气井临界携硫颗粒流量、临界携液流量、冲蚀流量和井口水合物生成条件,确定不同尺寸油管的合适产气量范围,再结合气井配产和井筒压力损失,优选出高含硫气井生产管柱的合理管径。利用该方法,对普光气田的高含硫气井P井进行了计算分析,结果表明,在当前生产管柱管径下,P井产气量大于冲蚀流量,井筒会发生冲蚀,为保护生产管柱,延长修井周期,将该井的产气量调整到当前生产管柱管径的合适产气量范围内,调整后该井生产稳定。采用该方法不但可以优选生产管柱管径,而且可以在现有生产管柱情况下,将产气量调整到当前生产管柱的合适产气量范围内。Abstract: In the production process of Puguang high-H2S gas well,many problems may occur,such as wellbore sulfur deposition,erosion,liquid loading and hydrate formation.However,reasonable diameter of production string can postpone or avoid these problems.For this purpose,according to the production characteristics of high-H2S gas well and based on the existing string selection method,proper gas production rate range of different tubing diameters was determined by analyzing the critical sulfur particle carrying flow rate,the critical liquid carrying flow rate,the erosion flow rate and wellhead hydrate formation condition.Then according to the production proration and wellbore pressure loss analysis,the reasonable diameter of production string was determined.Using this method,the production condition of high-H2S Puguang Gas Well P was calculated and the results showed that the gas production rate exceeded the erosion rate under current production string diameter,wellbore erosion would occur.In order to protect production string and postpone workover period,the gas production rate of Well P was adjusted to reach gas rate range suitable for current tubing diameter.After the gas production rate adjustment,Well P produced stably,which indicated that this method could not only determine the reasonable diameter of production string,but also adjust gas production rate to suitable production range under current tubing diameter.
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Keywords:
- high-H2S gas well /
- production string /
- critical flow rate /
- erosion flow rate
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