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In-tubing wellbore sidetracking operations

  • US 6,374,918 B2
  • Filed: 05/14/1999
  • Issued: 04/23/2002
  • Est. Priority Date: 05/14/1999
  • Status: Active Grant
First Claim
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1. A method for completing an earth wellbore, the wellbore having a first production zone to be abandoned, and the wellbore having tubing extending down within casing therein and forming a tubing-casing annulus, the tubing having a lower end at a point above a lower end of the casing, and the tubing-casing annulus being sealed by a first sealing apparatus above the first production zone, the method comprising the steps of:

  • sealing the lower end of the tubing with a sealing device to prevent fluid flow therethrough;

    creating a lower opening in the tubing above the first sealing apparatus;

    inserting cement into the tubing-casing annulus through said lower opening in the tubing;

    creating an exit opening through both the tubing and the casing above said lower end of the tubing;

    forming said lateral wellbore through said exit opening;

    severing the tubing above said lateral wellbore;

    creating an upper opening in the tubing above said lateral wellbore, said tubing now having a new lower end above said lateral wellbore; and

    setting a second sealing apparatus in the wellbore above said lateral wellbore so as to sealing off the tubing-casing annulus.

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