Research On Development Feasibility And Development Methods Of Heavy Oil Reservoirs In Area San 2+3 Of Xinjiang

With the continuous discovery of heavy oil reservoirs in China,heavy oil reservoirs currently occupy a certain proportion in domestic development.There are many ways to develop heavy oil reservoirs.For heavy oil reservoirs with low viscosity,under the condition of a certain loss of natural energy,most oil fields adopt conventional water drive development methods to extract crude oil to improve recovery.With the continuous development,the development problems of water flooding development of heavy oil reservoirs gradually emerged.For example,the viscosity of crude oil increased and the injection of water was severe;the injection well pattern was imperfect;the well pattern was severely damaged and the degree of water drive reserve control was low;The pressure is unevenly distributed and the pressure level remains low.In view of the existence of such development problems,it is necessary to explore how to adjust the development method after water injection and cold recovery to improve the development effect.This paper takes the common heavy oil reservoirs of the Kexia Formation in the 2 + 3 area of Karamay III,Xinjiang as an example to collect relevant data of the research object and investigate relevant literature,mainly carrying out the following research:(1)Carry out research on geological characteristics,including stratigraphic division,structural characteristics,sedimentary characteristics,pore characteristics,physical characteristics,reservoir heterogeneity,reservoir sensitivity,fluid properties,and temperature and pressure characteristics.(2)Carrying out the analysis of oil recovery capacity characteristics after water injection cold recovery development,combining water flood reserve control degree,water flood index and recovery degree,and water injection utilization rate analysis of the current research object water injection development effect,to recognize the current problems in water injection cold recovery development And influencing factors.(3)Select typical well areas for numerical simulation research,historical production fitting,and analysis of remaining oil distribution characteristics to provide a basis for adjusting development methods.(4)Analyze and determine the characteristics of viscosity-temperature curve,thermal recovery mechanism and development characteristics in the study area,and conduct feasibility analysis on the thermal recovery of the heavy oil reservoir in the study area,and screen the thermal recovery development method by comparing the reservoir parameters.(5)CMG numerical simulation software performs simulation analysis and comparison on different thermal recovery development methods,demonstrates the development effects of the combined methods of steam stimulation,steam flooding,hot water flooding and thermal recovery after water injection cold recovery,and determines a reasonable development method and Carry out injection and production parameter design,and finally determine a reasonable development method for the study area.The research analysis shows that the current research area has a poor water injection development effect and a large difference in the distribution of remaining oil in the cold recovery stage.Then,the theoretical feasibility of thermal recovery is combined with CMG numerical simulation software to verify that the Xinjiang 32 + 3 area The feasibility of thermal recovery,the determination of injection and production parameters related to thermal recovery,and the reasonable development method have certain guiding significance for the adoption of a reasonable thermal recovery method after the existing similar heavy oil cold recovery.