Study on the compatibility of oil reservoir reinjection in gas field wastewater in oil-gas superposition area.

Based on the results of water quality testing and analysis of water quality of representative stations, the results showed that the sealing trend of QT-1 and YT-1 was smaller than that of QT-2 and YT-1, QT-3 and YT-1, YL-2 and YT-1, and YL-1 and YT-1 at 25 °C and 60 °C. QT-1 and YT-1 were mixed at 1: 9, QT-2 and YT-1 were mixed at 5: 5, QT-3 and YT-1 were mixed at 1: 9, YL-1 and YT-1 were mixed at 5: 5, and YL-2 and YT-1 were mixed at 1: 9 when the calcium equivalent was the lowest and the scaling tendency was the smallest. According to the results of the compatibility experiment of wastewater from oil and gas field, QT-1 and YT-1 with the best compatibility were determined, and the compatibility experiment of reinjection formation after proportional mixing was studied, and the result was that the damage rate of single injection to the formation was 14%, and the damage rate of combined injection to the formation was 46. 2%. [ABSTRACT FROM AUTHOR]