Abstract: In view of the current situation of serious water production in Yingmaili gas reservoir of Tarim Oilfield, an integrated technology of water control and gas drainage was innovatively proposed. The APR plugging agent system suitable for gas reservoirs with high temperature, high pressure and high salinity was developed through laboratory experiments, which was composed of 1% acrylamide/acryloyl morpholine/vinylpyrrolidone terpolymer(APR) + 0.6% polyethyleneimine+ 0.6% modified alumina nanoparticles+ 0.2% thiourea. The temperature and salt resistance and long-term stability of the gel system were investigated, and the plugging ability of the plugging agent was evaluated through physical model experiments. The results show that APR plugging agent has good temperature resistance and long-term thermal stability. Under the condition of formation water(salinity is 23.33×10⁴ mg/L) at 107-150℃, the gelation time can be adjusted and controlled within 2-14 h, gel strength is maintained at grade G, and the maximum dehydration rate is only 7.1% after 180 d, with good plugging performance. In the integrated way of water control and gas drainage, 0.5 PV gelling liquid was injected first, and then 6 PV of N₂ was injected. After solidifying and crosslinking of the gelling liquid, the gel has the best ability of water plugging and gas drainage, and the plugging capacity of the gel to water is 9 times that to gas. This APR plugging agent system provides technical support for efficient development of gas reservoirs with high temperature, high pressure and high salinity, so it has broad application prospects.

Key words: water control of gas reservoir, gel, temperature resistance, salt resistance, Yingmaili gas reservoir