川西气田地层水回注选井选层研究

根据川西气田的实际情况,对致密砂岩层回注选井选层技术进行研究,初步建立了致密砂岩层回注选井选层技术,优选出川西气田1、2、3号等5个回注井区。目前,注水规模300m3/d,累计注水量达75 698.8m3,节约生产成本约200万元,且有效缓解了高浓度氯离子地层水外排带来的环保压力。现场回注试验表明:致密砂岩层回注高浓度氯离子地层水是可行的,回注选井选层技术具有现场推广应用价值。

Study on Well and Layer Selection for Formation Water Reinjection in Western Sichuan Gas Field

According to the actual situation in western Sichuan gasfield,the well and layer selection technology for tight sandstone layer reinjection is studied and initially established in this paper.We select 5 reinjection well areas in western Sichuan gas field such as No.1,No.2,No.3 etc.,The daily injection scale reaches 300m3/d and the cumulative water injection reaches 75 698.5 m3,which bring significant economic benefits,save production costs about 2 million Yuan and effectively alleviate the environmental pressures brought by high concentrations of chloride ion formation water efflux.The reinjection experiment results show that,tight sandstone layer reinjection high concentrations of chloride ion formation water is feasible,and reinjection well and layer selection technology has a field application value.