Research and application of pressure-bearing bridge plugging and squeezing technology in BZ block
Aiming at the difficult problems of plugging construction in BZ-2 well,such as the development of cracks in leakage layer,low pressure-bearing capacity of formation and easy occurrence of malignant leakage.The author starts with the geological characteristics of BZ block,summarizes the leakage factors and plugging operation difficulties of this block,and develops a set of plugging and squeezing technology of pressure-bearing bridge.The plugging technology adopts high temperature resistant,inert,non-softening deformation mate-rial in contact with water,organic combination of flake,granule and fiber,and moderate gra-dation of particles at all levels,which can effectively block fractures or pore channels in 5 mm.After plugging,the pressure-bearing capacity of the formation is above 20 MPa and has good compatibility with drilling fluid.The plugging technology has been successfully ap-plied in well BZ-2,which effectively improves the pressure-bearing capacity of the forma-tion,increases the drilling fluid density from 1.42 g/cm3 to 1.53 g/cm3,improves the drilling progress and operation quality,and provides a typical reference sample for the plugging op-eration of other lost circulation wells in this block.
万方数据
维普
