Analysis Of Water Intrusion Dynamics And Influencing Factors Of Thermal Recovery In Heavy Oil Reservoirs With Bottom Water

Heavy oil resources are an important supplement energy,the development issue received extensive attention,edge and bottom water heavy oil reservoirs accounted for a large proportion of heavy oil reservoirs.During the development of heavy oil reservoirs with edge and bottom water,the invasion of edge and bottom water provides the supplement energy for reservoirs,but also brings serious negative implications for the reservoir development.This paper studies the water invasion issues for KLMY oilfield nine 4 and 5 block.KLMY Oilfield nine 4 and 5 area belongs to heavy oil reservoir,and this block contacts with edge and contains bottom water.Since the operation,the water content increased year by year,and the effect of stimulation development to be worse.Firstly,combined with the development dynamics of the block,using water recovery rate and WOR to determine the situation of water production,and research the water sources and the main factors that affect the formation water invasion into the reservoir.Secondly,connected with the production dynamic data of this block,using material balance method combination with unsteady water invasion and the deficit volume of reservoirs to caculate the water influx volume,and combined with numerical simulation to analyze the relationship of reservoir water influx and time.The study found that Chatas methods require to limite the body of water,but the research block contains edge and bottom water,so the results calculated by this method maybe have large error,so ultimately we determined to use the deficit volume of reservoirs which didn't consider the size and shape of water bodies to calculate water influx and find that this method caculation resulte was more in line with the situation of water invasion.Finally,we used numerical methods to research the main factors of bottom water invasion into reservoir and argument the program of development.Combined with orthogonal test principle,designing 32 programs obtaining eight factors and four levels,the waterbrockthrough time as an indicator and using analysis of variance to analyze the test results.Study on changing the level of eight factors impact on the bottom water invasion,the result show that the amount of steam injection and fluid production impact on bottom water invasion significantly.The amount of steam injection greater water breakthrough time is longer and the amount of liquid withdrawal smaller water breakthrough time is longer.Connected with the factors affected on water invasion and 95337 wells group production design development programs.The study found tha the basic well pattern is better because of the 95337 wells group containing stronger water body and water invasing seriously.According to the development of production programs,demonstrated the feasibility of the return to development.