Abstract: China’s old oilfields have a great potential for the remaining oil resources though they came under a stage of high water cut and high recovery degree following many years of production. It is difficult for sustainably economic and effective development. However, those old oilfields are still the main battlefields of the nation’s oil development and continue to play a decisive role in securing China’s oil supply. To keep the production of the old oilfields stable faced the challenges in four areas -- inadequate stand-by resources deterioration of resources, difficulties for recovery caused by complicated geological conditions, poor economic properties but high requirements on engineering technology, and difficulties for large-scale replacement in the new areas and the new fields. The typical old oilfields adopted a series of countermeasures, such as iteration and modernization of EOR technology, fine reservoir characterization for optimization of the development plan, improving performance for increase in reserves and acceleration of productivity construction, and opening up the new battlefield of shale oil for expansion of the new field. This article analyzes seven typical old oilfields of Daqing, Changqing, Xinjiang, Shengli, Northwest, Bohai and Yanchang. It concludes that China has the clear objectives and applicable conditions for increasing the reserves and keeping the production stable at the old oilfields. The production can be hopefully kept stable for a relatively long period of time in spite of the difficulties. To further tap the resources potential of the old oilfields, it is proposed to strengthen the efforts for restructuring of the oil resources management system, focus on execution of the large-scale projects of increasing reserves and keeping production stable, enhance innovation of key technology and equipment, and perfect the preferential policies on exploration and development of oil and gas resources.

Key words: old oilfields; situation for stable production; increase of reserves and production; challenges; prospects

摘要： 我国老油田剩余油资源潜力较大，虽开采时间长且处于高含水、高采出程度阶段，持续经济有效开发难度大，但仍是我国石油开发的主战场，继续发挥石油保供“压舱石”作用。老油田稳产面临着后备资源不足、资源劣质化，地质条件复杂、开采难度大，工程技术要求高、经济性差，新区新领域规模接替难度大四方面挑战。典型老油田采取了提高石油采收率技术迭代升级；精细油藏刻画，优化开发方案；提升效益，推进增储建产工程；开辟页岩油新战场，拓展新领域等应对措施。通过对大庆油田、长庆油田、新疆油田、胜利油田、西北油田、渤海油田及延长石油7个典型油田分析，认为我国老油田石油增储稳产目标明确且具备实现条件，石油增产难度虽大但有望实现较长时期稳产。为更好挖掘老油田资源潜力，建议进一步深化石油资源管理体制改革，集中力量实施石油增储稳产重大项目，加强关键技术与重大装备创新，完善油气资源勘探开发支持政策。

关键词: 老油田；稳产形势；增储上产；挑战；前景展望