... & qualification Sliding sleeves have been used for flow-control purposes in oil and gas wells for decades. Although simple in design many users have questioned their reliability and they did not see much use for fracturing operations until the mid-2000s when ball drop activated sliding sleeves started...

... was used for zonal isolation, and ball- activated sliding sleeves were used for selective injectivity for each stage along the horizontal well in the re-fracturing treatment. The operation of the sliding sleeves, for each stage and the ball drops, generated compressional and shear events which were...