Experimental study of variable density compound water control based on continuous packer——A case study of deep-water HP/HT LS25 gas field in the South China Sea

Abstract Based on the deep-water high temperature and pressure LS25 gas field in Nanhai Reservoir, through design of heterogeneous formations water control experimental schemes, physical simulation experiments different reservoir processes have been completed, focusing evaluating variable density compound technology based continuous packers. In terms adaptability reservoirs, this basis, combined with experiment-mine scale conversion method, a water-controlled exploitation plan for deep high-temperature high-pressure reservoirs is given. The results show that: (1) Under elastic production conditions, body bottom rises “progressive” manner initial stage, generally develops “cone progression” middle late stages. (2) There are obvious differences effects various processes. A single sealing has no effect during period well, screen process early stage well production. good, but risk channeling cannot be avoided after breaks through. composite packer coning changed to certain extent. that water-free 13.7 years, total time extended 15.8 as 12.37×10 8 m 3 , recovery rate wells 9.2%, which higher than research aim establish an optimal development model provide good technical support rational scientific horizontal offshore reservoirs.