US 2014/0110179 A1 · REAMER TOOL POSITIONABLE IN A WELLBORE

Abstract

Described herein is a reamer tool (100) having a body (105) with bays (115) in which cutter arms (110) are mounted for deployment between a stowed position and a deployed position. A deployment mechanism is provided for deploying the cutter arms from their stowed position to their deployed position that maintains each cutter arm in a position that is substantially parallel to a longitudinal axis of the body (105) whilst in its stowed position and in its deployed position as well as during its deployment from its stowed position to its deployed position. A control module (300) is also described for controlling the deployment of the cutter arms (110). The control module (300) comprises a motor (310), a gearing mechanism (315) and a moveable element (320) that closes a port (385) in a first position and opens the port (385) in a second position. Fluid flow enters a chamber (340) behind a piston (170) through the port (385) to allow pressure to build up before actuating the piston (170) and thereby the deployment mechanism for the cutter arms (170).

Claims23

Dependent claims

A reamer tool positionable downhole in a wellbore, said tool comprising:

a substantially hollow body having a longitudinal axis and including an external wall having a first outer diameter;
at least one arm bay formed in a portion of the external wall around the periphery of the body;
at least one expandable arm located in an associated arm bay and mounted for expansion between a retracted position within the body and an expanded position in which each expandable arm describes a second outer diameter which is greater than the first outer diameter;
and
at least one expansion mechanism for expanding an associated expandable arm between the retracted and expanded positions;
wherein each expansion mechanism comprises two elongate links pivotally connected to the associated expandable arm at one end position and to its associated arm bay at another end position, each expandable arm being pivotally mounted at the two end positions with respect to its associated arm bay so that each expandable arm is maintained substantially parallel to the longitudinal axis in both the retracted and expanded positions, and, during its expansion and retraction between the retracted and expanded positions.

3 more elements

Dependencies are inferred from the claim text.

Reamer tool positionable in a wellbore

Life of this patent

Reamer tool positionable in a wellbore

Life of this patent

Abstract

Claims23