Study On The Stratified Water Injection And Improvement Of Water Flooding Effect In TK Block

TK block is a low permeability sandstone reservoir.Since it was put into production in2009,due to the development of multi-layered system,the difference between layers is great,the degree of water drive is low,and the water cut rises rapidly.The fault block stratified water injection has been carried out since the end of 2012.After several years of comprehensive treatment,the overall separate injection of water injection wells and the matching treatment of oil wells have slowed down the decline of both.However,due to the overall separate injection in the block,problems such as heavy workload of separate injection wells reallocation,continuous increase of water cut in old wells,difficulty in water injection in new development wells and responsibility for water flooding laws have emerged,and it is urgent to solve the problem of fine water injection in separate injection wells.To improve water flooding effect and ensure the sustained and stable production of oilfield,water flooding development policies should be adapted to different fault blocks in the block.Based on the fine geological study of TK block,the stratigraphic sequence and sub-strata are divided again.According to the cyclic order,from large to small,and step by step correlation,the section is divided and compared with the standard layer,and the sand group is divided by cyclic correlation.Under the control of the sand group boundary,the lithology,thickness,electrical characteristics and oil-bearing characteristics are used to pair.It is smaller than the blocks.The lower Es₁ member of the oil-bearing series in the block is divided into 3 oil groups and 6 sub-layers,Es₂ member is divided into 3 oil groups and 6 sub-layers,Es₃ member is divided into 3 oil groups and 10 sub-layers.The results show that by using the research method,fine geological research,adjusting the stratigraphic division of TK block,the stratified water injection method adapted to each well area of each fault block in this block is designed,and the separate injection scheme of this block is designed,which greatly improves the water flooding effect and provides experience for the separate injection control of the same type of reservoir.