提高MH气田整体开发效益地面工艺优化探讨

Discussion on Optimization of Surface Technology to Improve Overall Development Benefits of MH Gas Field

MH气田随着开采年限的延长,气井压力逐年下降,部分中、低压气井无法满足“J-T阀节流”浅冷处理工艺进站要求,存在关井的风险,降低了气井开采效率和气田开发指标。为增强地面工艺技术适应性,提高产品收率和气田开发的综合效益,按照充分利用地层能量、低压天然气两级增压、中压天然气一级增压、优化天然气压缩机组合原则,对集输处理系统进行深冷工艺改造,采用分子筛脱水、膨胀机制冷工艺,实现对C_(2+)等烃类组分充分回收。改造后预计可累计多采天然气25×10^(8)m^(3),新增乙烷产量1.5×10^(4)t/a,新增液化气产量1.3×10^(4)t/a,新增稳定轻烃2500 t/a。

With the continued exploitation of the MH gas field,the pressure of gas wells has been de-creasing year by year,partial gas wells of middle and low pressure cannot meet the entry requirements of the“J-T valve throttling”shallow cold treatment process,there is a risk of shutting in wells,which reduces the gas wells recovery efficiency and gas field development index.In order to improve the adaptability of surface technology and increase the product yield and the comprehensive benefits of gas field development,in accordance with“making full use of the energy of the stratum,two-stage su-percharging of low-pressure natural gas,first-stage supercharging of medium pressure natural gas,op-timizing the combination of natural gas compressor”,the gathering and transportation system needs to be cryogenically modified,using technologies of molecular sieve dehydration and expander refrigera-tion,to effectively recover C2+and other hydrocarbon components.After the modification,it is esti-mated that the cumulative increase of natural gas is 25×10^(8)m^(3),ethane production is 1.5×10^(4)t/a,liq-uefied gas production is 1.3×10^(4)t/a,and stable light hydrocarbons is 2500 t/a.