Method of repair of collapsed or damaged tubulars downhole
AssigneeBaker Hughes Incorporated
InventorsJames A. Sonnier, John L. Baugh, Gerald D. Lynde
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Abstract
A method of repairing tubulars downhole is described. A swage is secured to a force magnification tool, which is, in turn, supported by an anchor tool. Applied pressure sets the anchor when the swage is properly positioned. The force magnification tool strokes the swage through the collapsed section. The anchor can be released and weight set down on the swage to permit multiple stroking to get through the collapsed area. The swage diameter can be varied.
Claims37
An adjustable swage for use on a downhole tubular, comprising:
- a rounded body mounted to a mandrel wherein said body is movable into a plurality of positions to create a variety of continuous circumferences for a full 360°.
A downhole anchor, comprising:
- a mandrel having a passage therethrough;
- a plurality of slips movable between a retracted and an extended position;
- said slips movable toward said extended position in response to pressure applied in said passage;
- and
- a biasing member acting on said slips to force them back toward said retracted position in the absence of pressure in said passage.
A force amplification apparatus, comprising:
- a housing having a fluid inlet;
- a plurality of pistons operatively connected to an output shaft extending from said housing;
- wherein at least two pistons initially move in tandem in response to fluid pressure at said fluid inlet whereupon a predetermined movement of said output shaft at least one of said pistons engages a travel stop.
Dependencies are inferred from the claim text.