Well abandonment and slot recovery
AssigneeArdyne Holdings Limited
InventorsDavid Stewart, Lukas David, James Linklater
Life of this patent
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Abstract
A downhole casing cutting and removal assembly (10) and method of use thereof, the assembly comprising a work string (23) with a cutting mechanism (18) and plurality of resettable anchor mechanisms (20B-20D). The arrangement allows a test pull to be made following the cut by an anchor mechanism closer to the upper end of the cut casing section than an anchor mechanism (20B-20D) located close to the cutting mechanism. Time is thus saved by not having to raise and lower a single anchor mechanism (20B-20D) between the cutting position and the upper end of the cut casing section to undertake a test pull.
Claims19
A method of removing casing from a wellbore, comprising the following steps, performed on a single trip, in order:
- (a) providing a work string including:
- a cutting mechanism configured to cut a tubular in the wellbore;
- and
- a first anchor mechanism and a second anchor mechanism, each anchor mechanism configured to grip an inner wall of the tubular in a wellbore;
- and
- wherein the cutting mechanism is positioned towards a lower end of the work string and the first and the second anchor mechanisms are spaced apart along the work string above the cutting mechanism, the first anchor mechanism being arranged between the cutting mechanism and the second anchor mechanism;
- (b) running the work string in the well bore to position the cutting mechanism at a first depth in the tubular;
- (c) actuating the cutting mechanism to cut the tubular to form a cut section of tubular above the position of the cutting mechanism;
- (d) actuating the second anchor mechanism to grip the cut section of tubular;
- (e) pulling the work string to check that the cut section of tubular is free;
- (f) releasing the second anchor mechanism;
- (g) pulling the work string up through the wellbore so as to position the first anchor mechanism towards an upper end of the cut section of tubular;
- (h) actuating the first anchor mechanism to grip the cut section of tubular;
- and
- (i) pulling the work string from the well bore to remove the cut section of tubular from the wellbore.
Dependencies are inferred from the claim text.