Optimizal Method of Offshore Oil Artificial Lift Modes Based on Hierarchical Grade-Weighted Method

Currently, the method used for optimizing mechanical artificial lift methods in offshore oil fields is developed during the overall development plan.Generally speaking, there is insufficient theoretical support or data available in these processes.For that reason, it is important to develop a new analytical approach that incorporates all relevant technical, economic, and engineering factors.To improves the process, a hierarchical, grade-weighted method can be deployed to assign these three indicators for establishing a model of optimal offshore artificial lift.The newly developed method has been deployed for identification of optimal artificial lifts in X Oilfield for heavy oil development.The result shows that in the early stages of development, liquid production was 40-108 m3/d, and accordingly, a screw pump was proposed for its development.In the late stages of development, with liquid production was above 200 m3/d, ESP and dilution or chemical viscosity-reducer should be deployed to reduce viscosity of heavy oil.Results obtained by using the proposed method coincided with those specified in an overall development plan.In addition, all optimal wells that adopt artificial lift techniques identical to selection results have normal production.It can seen that the hierarchical grade-weighted method can could be deployed to identify artificial lifts with outstanding economic performances that will enhance the recovery in offshore environments.Eventually, the development efficiency in offshore oil and gas fields can be dramatically enhanced.