Properties and Application of Polyether Zwitterionic Foaming Agent
HE Xiujuan1, XU Haimin2, QIU Jun1, HUANG Li2, SHEN Zhiqin1, LI Yingcheng1
1. SINOPEC Shanghai Research Institute of Petrochemical Technology Company Limited, Key Laboratory of Surfactant for Enhanced Oil Recovery, Shanghai 201208, China;
2. Research Institute of Oil Production Engineering and Technology, SINOPEC Zhongyuang Oilfield Company, Puyang 457001, China
Abstract：In view of the insufficient temperature and salt resistance of surfactants, as well as weak foam stability, the polyether zwitterionic surfactants (LAEB) were prepared for foam deliquification of natural gas wells. The effects of synthetic reservoir brine salinity, temperature, pH value and surfactant concentration on the foam properties of LAEB were investigated experimentally and compared with the performance of the conventional zwitterion surfactant Betaine (LAB). The results showed that the reversal of the carboxyl group in LAEB was limited due to larger steric hindrance of the polyether segment and thus foam stability was enhanced, compared with LAB. Under the conditions that the salinity of synthetic reservoir brine was 0-155 g/L, the pH value was 3-7, the temperature was 50-80 ℃ and the foaming agent concentration was 0.050%-0.150% (mass fraction), the foaming height of LAEB reached all higher than 150 mm. The preferred concentration of LAEB was 0.075% (mass fraction) and the preferred salinity of synthetic reservoir brine was 0-141 g/L. LAEB was tested in a gas well Puguang 104-1, which was unable to loading liquid itself. After foam deliquification, 19 m3 of liquid was produced in 4 h, the gas production was raised from 1.8×105 m3/d to 2.5×105 m3/d, and the fluid production increased from 82.3 m3/d to 138.8 m3/d. It indicates a good application prospect for LAEB in foam deliquification in ultra deep water flooded gas reservoirs, which provides guarantee for long-term stable and high production of gas wells.
HE Xiujuan,XU Haimin,QIU Jun et al. Properties and Application of Polyether Zwitterionic Foaming Agent[J]. Chemical Reaction Engineering and Technology, 2023, 39(3): 227-233.
