Study On Steam Stimulation Of Horizontal Wells In Heavy Oil Reservoir With Screen + Blind Tube Completion

Heavy oil accounts for a large proportion in Chinese oil and gas resources.As the main method of heavy oil recovery,steam huff and puff plays a dominant role in thermal recovery of heavy oil.At present,horizontal well steam huff and puff mainly adopts general steam injection technology.In the development process,due to the influence of factors such as formation heterogeneity,horizontal wells are prone to problems such as uneven steam and mobilization,resulting in low horizontal well production.In this paper,CMG numerical simulation software is used and Dilation model is added to study the variation law of petrophysical properties in the process of steam huff and puff and the rule of steam channeling and gas injection and production in general steam injection in horizontal Wells.In order to solve the problem of steam channeling and excessive steam absorption in the high permeability section,the screen pipe and blind pipe completion subsection steam injection technology is adopted,and the rule of subsection steam injection and production is studied.In order to improve the ratio of subsection steam injection to increase production,optimize the design of steam injection pipe string and subsection steam injection parameters,and provide theoretical support and guidance for the scheme design of subsection steam injection in horizontal Wells.The results show that the change of formation pore permeability during steam stimulation will affect the ratio of suction in high permeability section.The general steam injection is prone to steam,the larger the volume of the high-permeability section,the later the steam generation time,the higher the permeability grade and the longer the completion length,and the earlier the steam generation time,the higher the proportion of steam after steam,the more obvious the output after steam.After the steam is used,the steam injection rate can reduce the steam absorption ratio of the high permeabilitysection by about 80%,so that the reserves of the low permeability section can be effectively utilized,and the horizontal well productivity can be increased,and the production increase ratio is above 40%.Sensitivity analysis shows that the position of the blind pipe and the timing of steam injection have the greatest influence on the effect of segmented steam injection.Immediately after the steaming,the steam injection,the blind pipe distance from the horizontal well to the 10% completion length,the length of the blind pipe is0.1?5m,and the number of the two is the best.For steam-free reservoirs,the general steam injection effect is better.