中坝气田须二气藏水处理回注跟踪监测分析

Treatment, Tracking, Monitoring and Analyzing of T_3X^2 Gas Reservoir Water in Zhongba Gas Field

中坝须二气藏不断开采,已经出现了水侵,目前日产气量为60×104 m3左右,日产水240m3 左右,将地层水回注地层,既能解决地层水出路问题,又能彻底地清除地层水对环境的污染。通过对须二气藏产水情况的调查,对气藏水处理前后及露头区水质的Ca2+、Mg2+、CO2-3 、SO2-4 、悬浮物、挥发酚、油、COD、pH值、硫化物、氯根等项目进行了监测、分析,认为须二气藏地层水的处理效果能达到回注水的要求,处理后回注是完全可行的。文中分析了回注前景, 并提出了对露头区定期监测的建议。

The gas flow of T_3X^2 gas reservoir in Zhongba gas field has reached about 60×10~4 m^3/d ,and also the water invasion gas has occurred with it. The rejection of the formation water can thoroughly not only solve the problem of how to deal with it but also can completely eliminate the environmental pollution. The water flow of T_3X^2 gas reservoir has reached around 240 m^3/d at the present time. This article analyzes the present status of water treatment by investigating producing water situation of T_3X^2 gas field and monitors and analyzes some items before and after the treatment, such as Ca^(2+), Mg^(2+), Ba^(2+)+Sr^(2+), CO^(2-)_3, SO^(2-)_4, suspended substance(SS), volatilization phenol, oil, COD, pH, sulfide, Cl^- and so on. The results show the rejection is fully feasible after the formation water is treated to meet the standard, and it is necessary to monitor periodically the outcrop area.