and the sleeve 51 surrounds the sleeve 56 annular swivels 53 are located between the rotating sleeves 50 and the stationary outer sleeves 51 as described below the wet cement is injected into the isolation zones 24 one at a time as a result the cement in some of the zones 24 hardens before the cement in other zones 24 to prevent this hardened cement from preventing rotation of the tubing 54 the spacers 52 fig4 of each isolation section 30 are designed to shear when the torsional forces exerted by the tubing 54 on the sleeve 50 exceed a predetermined level as shown in fig6 the wet cement is furnished to each isolation zone 24 through a cementing tool 60 the tool 60 has a tubing 61 that receives the wet cement from the surface of the well the tubing 61 has radial openings 62 that allow the cement to pour into the casing 21 two annular packers 64 located on opposite ends of the openings 62 seal off the annular region between the exterior of the tubing 61 and the interior of the casing 21 the resultant annulus between the packers 64 directs the wet cement through the radial openings 34 in the casing 21 referring to fig7 in an alternative isolation section 70 the fin 31 may be replaced by opposing helical fins 72.