Current status and prospect of integrated infilling adjustment technologies for high water cut period of continental sandstone oilfields in Bohai Sea
The proven geological crude oil reserves in the continental sandstone oilfields in the Bohai Sea account for more than 80％of the total proven crude oil reserves in the Bohai Sea.At present,the main oilfields have entered the development stage of high water cut,which is restricted by the development mode of cluster well pattern on offshore platforms,making it more difficult to maintain stable production.In order to further improve development effects and enhance oil recovery of the oilfields,four key integrated infilling adjustment technologies have been developed over the past 10 years,including fine reservoir description,quantitative evaluation of remaining oil,infilling adjustment of injection-production well patterns,and longitudinal injection-production subdivision,and two three-dimensional well pattern development modes have been established for heavy oilfields of offshore continental sandstone.The integrated infilling adjustment technologies were applied to SZ36-1,QHD32-6,and more than 20 production oilfields,involving a total of more than 1 000 development wells.As a result,the production speed of the main oilfields was increased by more than 1.5 times,and the oil recovery was increased by more than 10 percentage points.The key integrated infilling adjustment technologies and practical understanding of the Bohai Oilfield were systematically summarized,and the direction of development technologies for the ultra-high water cut period in the future was predicted.The results of this paper have important reference significance for promoting the sustainable stable production and efficient development of offshore oilfields in the medium and long term.
Bohai Oilfieldhigh water cut periodinfilling adjustmenthorizontal welldevelopment mode
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