Application of water injection indicative curves in deep pumping of carbonate reservoirs in Tahe Oilfield

The technique which injects water to replace oil in single well is an effective and economic way to slowdown production decline in the carbonate fractured-vuggy reservoirs in the Tahe Oilfield. The physical meanings of the different characteristics of water injection indicative curves were analyzed. According to the seepage formula of low-permeability reservoirs, the fluid-supplying condition of the 2nd set of reservoir was calculated. Combined with present pumping techniques, we used deep pumping to drawdown dynamic liquid level to the height which had smaller pressure than the inflecting point of water injection. In this way, production pressure difference was enlarged, which caused the liquid supplying of the 2nd set of reservoir in far wells. The technique was applied in field works and had achieved good effects.