Method for lining a casing

A method for lining a casing affixed within a well bore, comprising the steps of:

• providing a tubular polymeric material having an outer diameter greater than the inner diameter of the casing and an insertion end;
• reducing the outer diameter of the tubular polymeric material so that the outer diameter of the tubular polymeric material is less than the inner diameter of the casing thereby enabling the tubular polymeric material to pass into the casing;
• passing the reduced tubular polymeric material down the casing to a predetermined depth;
• maintaining the reduced polymeric material in a reduced state until the reduced polymeric material is positioned at the predetermined depth by placing the reduced tubular polymeric material in tension as same is being passed down the casing, the reduced tubular polymeric material being placed in tension by suspending an amount of weight from the insertion of the tubular polymeric material prior to passing same down the casing sufficient to maintain the tubular polymeric material in tension as same is being passed down the casing so that the outer diameter of the tubular polymeric material remains less than the inner diameter of the casing as the tubular polymeric material is being passed down the casing;
• and
• allowing the reduced tubular polymeric material to rebound such that the exterior wall of the tubular polymeric material sealingly presses against the internal wall of the casing so as to seal a breach in the casing.

A method for lining a casing affixed within a well bore, comprising the steps of:

• providing a tubular polymeric material having an outer diameter greater than the inner diameter of the casing, the tubular polymeric material having an insertion end;
• disposing a weight retainer member in the insertion end of the tubular polymeric material;
• connecting a pulling head to the insertion end of the tubular polymeric material, the pulling head having an inner diameter less than the inner diameter of the tubular polymeric material such that an internal support shoulder is formed by the pulling head;
• passing the pulling head and the tubular polymeric material through a roller reduction unit to reduce the outer diameter of the pulling head and the tubular polymeric material so that the outer diameter of the pulling head and the tubular polymeric material is less than the inner diameter of the casing thereby enabling the pulling head and the tubular polymeric material to pass into the casing;
• connecting an amount of weight to the weight retainer member so that the weight member engages the support shoulder of the pulling head and the amount of weight is supported on the support shoulder of the pulling head, the amount of weight being sufficient to maintain the tubular polymeric material in tension as same is being passed down the casing so that the outer diameter of the tubular polymeric material remains less than the inner diameter of the casing as the tubular polymeric material is being passed down the casing;
• passing the reduced tubular polymeric material down the casing to a predetermined depth;
• and
• removing the amount of weight from the pulling head so as to allow the reduced tubular polymeric material to rebound such that the exterior wall of the tubular polymeric material sealingly presses against the internal wall of the casing so as to seal a breach in the casing.

A method for lining a casing affixed within a well bore, comprising the steps of:

• providing a viscoelastic pipe having an outer diameter greater than the inner diameter of the casing;
• reducing the outer diameter of the pipe so that the outer diameter of the pipe is less than the inner diameter of the casing while passing the pipe into the casing to a predetermined depth and loading the pipe with an amount of weight so as to place the pipe in sufficient tension so that the outer diameter of the pipe remains less than the inner diameter of the casing as the pipe is being passed into the casing to the predetermined depth;
• and
• unloading the amount of weight from the pipe thereby allowing the pipe to expand against the internal wall of the casing.

A method for lining a casing affixed within a well bore, comprising the steps of:

• providing a viscoelastic pipe having an outer diameter greater than the inner diameter of the casing;
• passing the viscoelastic pipe through a roller reduction unit at the well bore to radially compress the viscoelastic pipe so as to reduce the outer diameter of the viscoelastic pipe so that the outer diameter of the viscoelastic pipe is less than the inner diameter of the casing, the roller reduction unit having a plurality of banks of rollers cooperating to form a substantially frustro-conically shaped passageway such that the outer diameter of the viscoelastic pipe is gradually reduced as the viscoelastic pipe is passed therethrough;
• passing the reduced viscoelastic pipe into the casing to a predetermined depth prior to the reduced viscoelastic pipe expanding against the internal wall of the casing;
• and
• allowing the viscoelastic pipe to expand against the internal wall of the casing thereby providing a fluid-tight casing liner.