大庆油田化学驱分层注入技术现状与发展趋势

化学驱分注技术已成为高含水油田提高采收率、保障油田可持续发展的重要技术手段。大庆油田根据不同油层类型、不同开发阶段需求，形成了较为成熟的注聚工艺体系，取得了较好的开发效果。目前已形成以“全过程一体化分注技术”为主体的化学驱分注技术，实现了同井分层注入量与分子量的双重调节，一趟管柱满足空白水驱、化学驱及后续水驱2~7层分注需要，测试工艺与水驱兼容，投捞、验封、流量测调全电控。随着油田生产的发展，化学驱开发规模的不断扩大引发了现场应用中的新问题:分注井测试工作量逐年增多，班组测调能力已达极限；分注合格率下降快，测调周期缩短；开发油层向渗透率更低、隔层更薄、厚度更小的油层转变等问题，为此提出了结合自动监测、远程控制等自动化技术，以实现化学驱分层注入技术监测与调整智能化的新工艺，同时研发了小卡距和小隔层细分工艺，为油田化学驱分注进一步高质、高效开发提供技术参考。

Status and trend of chemical flooding and layered injection technology in Daqing Oilfield

The process of separate injection in chemical flooding is a key method of enhancing oil recovery and guaranteeing sustainable development of oilfield at the high water-cut stage. In Daqing Oilfield, a relatively sophisticated process of polymer injection has been formed according to oil layer types and the technical needs of oil layers at different development stages, and good development results have been achieved. Currently, the technology of chemical flooding dominated by whole process integrated separate injection and dual adjustment of the injection volume and molecular weight in separate layers in the same well have been realized. The downhole string run in one trip meets the requirements of separate injection in 2-7 layers in blank water flooding, chemical flooding and subsequent water flooding. The test process is compatible with water flooding. The operations of fishing, sealing test, and flow measurement and adjustment are electronically controlled. With expansion of chemical flooding, the workload of separate injection wells has been increased, and the limit in capabilities of testing and adjustment has been reached. In order to solve problems such as rapid decrease of success rate of separate injection, short test and adjustment cycle, and low permeability and thinner oil layers with thinner interlayer, it is proposed to integrate automatic monitoring and remote control to realize intelligent monitoring and adjustment of separate injection in chemical flooding. The layered injection technology with small layer spacing and fine layer division has been developed, which provides reference for high-quality and efficient development of oilfield under chemical flooding.