魏岗高凝油田常规污水回注开发模式探讨

魏岗油田位于南阳凹陷，为一断鼻断块圈闭油藏，具有典型的同凝油藏特点，进行热水驱固然不可以提高驱油效率，对提高开发效果有利，但对于中小油田，开发成本投入较大。通过开发前期的常温水驱数字模拟研究，对魏岗油田这样的地层温度与地层析蜡温度高，地热梯度大，地层温度变化补偿快的高凝油藏，投入开发10年后油井井底温度仍然保持在原始温度，注冷水泽开发效果的影响，也主要表现在注水水井氏地带，对生产井乃至整个油藏的影响并不在大。现场采用污水回注开采，既提高了注水温度，也保护了生态环境，保证了油田长期高效的可持续开发。

Comprehensive adjustment of development mode of common swage recycling in Weigang high pour point oil field

The oil displacement efficiency of Weigang oil field can be improved for it's typical high pour point reservoir, and this is to the advantage of the oilfield to improve development effect. But for the middle-small sized oil fields, it is harmful of effective development because of its high cost of production. By means of normal temperature water displacement numerical simulation at earlier stage of development, it is found that the high pour point crude reservoirs like Weigang which have characteristics such as high formation temperature, high formation wax precipitation temperature, high geothermal gradient, fast formation temperature variation compensation have been still keeping the original temperature in the well bottom after ten years development. The influence of cold water flooding to development effect is mainly at bottom zone of water flooding well, and it has little influence on production well and even whole reservoir. Utilizing sewage recycling development to oil field is not only raises water injection temperature, but also improves development effect, as well as protects ecology environment, and therefore oilfield can enjoy a long-term sustained development.