In actual production process of oil and gas fields, there will be a wide variety of maintenance tasks with different urgency levels. And the oil wells with maintenance tasks are widely distributed. At present, the routing scheduling of maintenance technicians still relies on manual experience, with low scheduling efficiency and low labor force utilization. It is of great significance to make reasonable arrangements for maintenance technicians to ensure that they complete various maintenance tasks as soon as possible. This can effectively guarantee the safe and stable production of oil and gas fields and thus reduce the economic losses caused by downtime. In this paper, after analyzing the characteristics of maintenance tasks in the actual production process of oil and gas fields, four schemes were proposed, which are daily general scheduling, temporary scheduling, manual scheduling and emergency scheduling according to different scenarios. Moreover, different mixed linear programming models were established for these four schemes. A scheduling software written in C# language was verified by field application. The results showed that the proposed scheduling scheme can realize the timely and effective processing of maintenance tasks in different situations.