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某水驱区块自2014年10月提压注水后,其周围连通油井含水上升趋势逐渐明显。通过对含水上升井的精细地质研究,及时发现注水井调控中存在的问题,通过控制高渗层注水,提高欠注层注入能力达到调整注水压力、控制无效注水、抑制油井含水上升趋势。数据表明,提压注水后,由于各油层岩性、物性和储层流体性质不同,造成各油层在吸水能力、水线推进速度、地层压力、出油状况和水淹程度等方面的差异,高渗层吸水能力增强,低渗层吸水能力大幅下降,初期全井水量增加但大部分均为无效循环注水,高低渗透层形成相互制约和干扰。中低渗透率油层启用程度降低是周围油井含水上升的主要因素。依据吸水剖面及测试各层吸水资料,降低高渗层配注,提高低渗层注入压力,合理控制流压,最大限度满足差油层配注需求,抑制区块含水上升趋势。
After a water-flooding block was pressurized and injected water in October 2014, the water-bearing rise trend around the connected oil wells gradually became obvious. Through the fine geological study of aquifer ascending wells, the problems existing in the regulation and control of injection wells were found in time. By controlling the injection of water in the high permeable layer, the injecting capacity of under-injection layer was increased, the injection pressure was adjusted, the invalid injection was controlled, and the hydration rise of the wells was restrained. The data show that, due to the difference in lithology, physical properties and fluid properties of the reservoirs, the difference in water absorption capacity, waterline propulsion velocity, formation pressure, oil discharge conditions and water flooding caused by the pressure injection and water injection is high The water absorption capacity of the permeable layer is enhanced, the water absorption capacity of the low permeability layer is greatly reduced, while the initial water volume of the whole well increases but most of the water injection is invalid circulation, and the high and low permeable layers form mutual restriction and interference. The lower activation of middle and lower permeability reservoirs is the main factor for the increase of water content in the surrounding oil wells. Based on the water absorption profile and water absorption data of each layer, the injection of high permeability layer was reduced, the injection pressure of low permeability layer was increased, and the pressure was controlled reasonably to meet the demand of differential injection with the maximum extent to restrain the upward trend of water cut in the block.