气田水回注风险防控对策研究

Study on the Risk Prevention and Control Countermeasures of Gas Field Water Reinjection

气田开采的同时将产生大量的气田水,气田水具有成分复杂、矿化度高、氯化物含量高的特点,不能直接排放。目前很多气田采用回注的方式处理气田水,存在注入水外泄,污染地下水、地表水和土壤的潜在风险。根据川西北气矿气田水的水质特点,结合气田水处理现状,对气田水回注过程的环境风险及风险防控措施进行分析。以龙7井的跟踪监测为例,阐明气田水回注监控的预警功效,降低了回注过程中的环境风险。

Gas field exploitation will produce massive gas field water, which is characterized by complex composition, high level of mineralization and rich in chloride, and cannot be discharged directly. Currently, reinjection is the common approach adopted in gas fields, which bears potential environmental hazards including leakage of reinjected water and the contamination of underground water, surface water and soil. According to the property of gas field water of Northwest in Sichuan, the research is performed concerning risk prevention and control measurements. Tracking and monitoring of the Long 7thwell as a successful application case, the effects of reinjection of gas field water monitoring are illustrated, which reduces the environmental risk of reinjection process.