高含水后期周期注水应用的一个实例

针对大庆油田河流一三角洲沉积体系的多油层、非均质注水开采的高含水后期所暴露出部分区块和个别井区的产液量高、含水高、动用状况不均衡、常规注水难以再扩大波及体积等问题，应用数值模拟研究了具体开发区块周期注水的合理时机和周期。通过现场试验，达到了控制产量递减速度、含水上升速度、套管损坏速度、提高注入水利用率的目的。为非均质多油层油田注水开发后期扩大波及体积提供了实践依据。

An Example of Cyclic Water Flooding at Later Period of High Water Cut

Cyclic water flooding is one commonly used method, but the application results are different with different oilfield and blocks. At the late period of water injection in multi layer heterogeneous river-delta depositional system of Daqing oilfield, liquids production of partial blocks and certain well fields is high, water cut is high, producing performance is not balanced, and swept volume of conventional water injection can not be improved. With the consideration of above problems, the reasonable time and cycle for cyclic water flooding in certain blocks are studied based on numerical analog. The field tests prove: production decline rate, water cut increasing rate and casing damage rate can be controlled, and the increasing rate of water injection volume and liquids production volume can also be controlled. The research is meaningful for improving swept volume in multi layered heterogeneous mature oilfields.