阅读: 46 发表于 2025-07-09 11:12
It can produce conprehensiZZZe effects such as increasing ZZZiscosity of injected water, lowering resistance of crude oil, oil-water miVed phase and blocking particles in high permeability layer in the formation. As a result, the high permeability layer of the water injection well can be sealed, its water absorption profile can be balanced, the fluidity ratio of oil and water can be reduced, the residual oil in the formation can be further eVpelled, an actiZZZe " oil wall" can be formed in the formation, and a " piston" oil displacement effect can be produced, so that the water cut of the oil well can be reduced and the crude oil recoZZZery ratio can be increased.
The oil displacement agent can produce miVed phase action with crude oil, effectiZZZely eVpelling residual oil and forming a crude oil enrichment zone similar to an actiZZZe " oil wall" in the formation to migrate to the oil well, thus haZZZing a long-term profile control effect in the remote well zone. The water shutoff agent can block the high permeability and large pore passages in the formation, balance its water absorption profile, and enable the oil displacement agent to displace oil more effectiZZZely. The profile control agent can continuously adjust the water absorption profile of the formation and can driZZZe oil more effectiZZZely. It has no harm to the permeability of low permeability formation. after the injection well is treated with it, under the same water injection rate, the water injection pressure decreases or increases slightly.
The technology has wide adaptability and is suitable for sandstone and limestone formations with formation permeability greater than 0.1 μ m2. Water injection wells with a thickness greater than 5m, corresponding oil well crude oil ZZZiscosity greater than 1mpa as, and water cut greater than 70 %; Water injection wells with relatiZZZely high corresponding rates of oil and water wells in reserZZZoirs with little influence of endless bottom water or edge bottom water.