Study On Steam Injection Technology In Multi-branch Horizontal Wells

Multi-branch horizontal wells are the main types of complex structural wells,and multi-branch horizontal wells have become an important means of mining heavy oil.Therefore,it is of certain significance to determine the influencing factors of the mining effect of the wells.This paper mainly studies the effects of different factors on the steam stimulation of multi-branch horizontal wells,including the number of branch segments,the position of the branch section on the horizontal section of the multi-branch horizontal wells,the angel of the branch,the length of the branch section,after optimization,the optimal combination of well parameters under the specific conditions is:the number of branches is 3,the branch length is 50m,the branch angle is 90°,and the distance between branches is 40m.And compared the same length of the horizontal wells and complex multi-branch wells mining effects.In the case of other parameters unchanged,espectively analyzes the effects of steam injection parameters and reservoir geologicsl parameters of the various factors on the steam stimulation of multi-branch horizontal wells,and the cumulative oil production in on cycle is the basis of judgment.Among them,the four factors of steam injection,steam pressure,steam dryness and steaming time have great influence on the steam stimulation of multi-branch horizontal wells,and then optimizing the steam parameters.The result under certain conditions is:steam injection rate is 600m~3/d,steam injection temperature is 290℃,steam steam dryness is0.9,and the number of days is 6 days.Besides that,the results show that with the increase of oil layer thickness,porosity,permeability and reservoir pressure,the mining effect of multi-branch horizontal wells gradually increases,and with the increase of crude oil viscosity,the mining effect is weakened.