Synchronization technology is one of the key techniques to promote the performance of mobile database systems. This paper which relied on the well completion mobile platform and integrated the well completion business data proposed a mobile data synchronization model which is based on operation log. In this model, the generation of log sequences, and the resolution of conflicts are discussed in detail, and the implementation algorithm is proposed. In this model, mobile devices are allowed to access the local copy data and locally commit the mobile transactions when the system is disconnected, meanwhile the user behavior can also be recorded in the mobile transaction log. According to the log sequence which is returned by the synchronous server, the mobile devices can update the local data when the system is reconnected to ensure the consistency of data. Besides, by introducing the merger of log and time-stamp into the model, the model can reduce the resource consumption, and improve the efficiency of the synchronization. The experiments proved that the algorithm can exchange the well completion business data between mobile devices and synchronization server rapidly and efficiently.