注水开发油田原油外流有三种形式:一是油水过渡带原油外流;二是原油窜流气顶区;三是原油沿井筒(封固质量不好的井)或断层窜入浅部地层。导致原油外流的主要因素是高压注水和注采不平衡引起的。以上三种形式在各油田均有不同程度的表现。 大庆油田开发实践表明,上述三种情况均存在,需要从开发和钻井等方面采取措施,以减少原油外流所造成的储量损失。 Water injection There are three forms of oil outflow in the oilfield: one is the crude oil outflow in the oil-water transition zone; the other is the top zone for the crude oil to flow through the gas zone; the other is that the crude oil flies into the shallow formation along the wellbore (poorly sealed well) or the fault. The main factor leading to the outflow of crude oil is caused by high pressure water injection and injection-production imbalance. The above three forms have different degrees of performance in all fields. Daqing oilfield development practice shows that the above three conditions exist, and need to take measures from the aspects of development and drilling to reduce the reserve loss caused by the outflow of crude oil.