【摘要】 注水压力是水驱油田注采压力系统中的重要参数,确定合理注水压力对调整层间矛盾、提高油田开发效果、降低套损等具有重大意义。合理的注水压力增加了吸水厚度和吸水层位,缓解了层间矛盾。注水压力过高导致吸水能力增强,降低了开发效果。高含水期的油藏注入压力一般通过实验获取。运用经验公式法和数值模拟法,在注水压力不超过地层破裂压力的情况下,计算该区块合理注水压力值,考察了脱气对原油黏度的影响进而对采收率的影响。该方法易于计算、精确度高,确定了中区西部合理注水压力值范围。结果表明:中区西部合理注水压力为17.1～20.2MPa时,有利于指导油田的高效开发。更多还原

【Abstract】 Water injection pressure is an important parameter in the injection-production pressure system of a water drive oilfield.Determining a reasonable water injection pressure is of great significance for adjusting the contradiction between layers,improving the effect of oilfield development,and reducing casing damage.Reasonable water injection pressure increases the thickness of water absorption and the level of water absorption,and alleviates the contradiction between layers.If the water injection pressure is too high,the water absorption capacity will increase and the development effect will be reduced.There are many studies on the injection pressure of the reservoir in the high water-cut period,which are generally obtained through experiments.Using empirical formula method and numerical simulation method,when the water injection pressure does not exceed the formation fracture pressure,the reasonable water injection pressure value of the block is calculated,taking into account the influence of degassing on the viscosity of crude oil and then on the recovery factor.This method is easy to calculate and has high accuracy,and it has determined the reasonable range of water injection pressure in the western part of the central area.The results show that the reasonable water injection pressure in the western part of the central area is 17.1～20.2 MPa,which is conducive to guiding the efficient development of oilfields.更多还原