is injectable according to one embodiment of the present invention wellbore 3 is formed by using a drill bit that is lowered at a lower end of a drill string after a predetermined depth is drilled the drill string and bit are removed and the earthen well face at that depth is then lined with casing 4 which is cemented to the upper well face this procedure is repeated until well bottom 9 is drilled to a desired depth the lower earthen well face 7 below the lowermost casing 4 is formed with a smaller diameter than the inner diameter of the lowermost casing e g the inner diameter of the lowermost casing is 13 u215c u2033 while that of the lower earthen well face is 12 u00bc u2033 a cylindrical slotted steel liner 6 for preventing solid material from entering wellbore 3 while permitting fluid from exiting the wellbore is lowered into the well and is attached to the lowermost casing 4 by means of an oblique and outwardly extending sealing liner hanger 8 before liner 6 is lowered into the well two vertically spaced annular swell packers 11 and 12 are attached to the outer face of the liner liner 6 extends downwardly to substantially the edge of well bottom 9 when liner 6 contacts well bottom 9 the latter may apply a reactive force to ensure liner immobilization rubber swell packers 11 and 12 have elastomeric polymer sealing elements that are adapted to swell to.