Evaluation Of Development Effects Of Steam Stimulation On NB35-2 Heavy Oil Reservoir

Offshore heavy oil with high-cost,high-risk,high-speed development characteristics,when the viscosity is high,the conventional water flooding is no longer economically viable,then we need to consider the thermal recovery research.Therefore it is necessary to carry out the development effect of thermal recovery research on the offshore heavy oil reservoir.This thesis has done a research on steam stimulation technique for NB35-2 oil field.Firstly,from the aspects of geological overview,fluid physical property and injection parameters,the development effect of NB35-2 oil field is analyzed.The reservoir parameters and injection parameters are extracted,and the existing problems in the development of the oil field are put forward.Secondly,a circular physical simulation model is established according to geological parameters and injection parameters of NB35-2 oil field and similarity criterion for steam stimulation.A circular device was used for two-dimensional physical simulation,during which temperature and pressure were monitored in real time.The temperature field and the development of the dynamic data of the steam stimulation and superheated steam stimulation are developed and then used to analyze the effect of common steam stimulation and superheated steam stimulation on the development efficiency of heavy oil field.The results show that better development efficiency is resulted from superheated steam stimulation than that from common steam stimulation.Then numerical experiments are conducted and prove the accuracy and reliability of physical experiments.Finally,numerical simulation models are built with the reservoir parameters and injection parameters of NB35-2 oil field to analyze the development efficiency of steam stimulation technique and alternative technique for steam stimulation,for which sensitivity analysis is made on reservoir parameters and injection parameters.The results of this thesis is significant to the optimization and development efficiency evaluation on the steam stimulation process for horizontal wells in NB35-2 heavy oil reservoir and provides guidance for its practical application on heavy oil reservoirs.