Multi-cycle downhole tool with hydraulic damping
AssigneeSpecialised Petroleum Services Group Limited
InventorGeorge Telfer
Life of this patent
Estimating the term…
Abstract
A downhole tool which includes a locking bar to allow movement of a sleeve within the tool over a pre-defined range. The range is defined by a recess arranged axially or circumferentially in the tool, in which the bar locates. Fluid can be vented from the recess to provide a hydraulic brake, to prevent premature shearing of any shear pins in die tool. A stabiliser, jetting and circulating tool is described including the locking bar together with applications when incorporated in a bottom hole assembly. The tool allows multiple operations to be performed on a single trip.
Claims22
A downhole tool, the tool comprising a substantially cylindrical body having a central bore running axially therethrough, a sleeve located within the bore, the sleeve including a recess on an outer surface, at least one locking bar, the locking bar being an elongate member having a first and a second end, the at least one locking bar being located through the body and substantially perpendicular to the central bore, the first end of the at least one locking bar being located in the recess, and wherein the body and sleeve move relative to each other by virtue of the bar moving within the recess.
A method of moving a sleeve mounted in a cylindrical body of a downhole tool in a well bore, the method comprising the steps:
- (a) locating a locking bar through the body and in to a recess on the outer surface of the sleeve;
- (b) locating a shear screw through a portion of the body and the sleeve;
- (c) releasing a drop ball to contact a shoulder of the sleeve and block fluid flow through the tool;
- (d) shearing the shear pin as a result of the build up of pressure behind the drop ball;
- (e) moving the locking bar relative to the sleeve by the distance of the recess;
- and
- (f) hydraulically braking the movement of the locking bar through the controlled release of fluid from the recess.
A method of performing multiple downhole operations on a single trip in a well bore, the method including the steps of:
- (a) Mounting a downhole tool on the work string, the tool comprising:
- a tubular body having an axial throughbore and adapted for connection within a workstring;
- a sleeve mounted around the body, the sleeve including one or more stabilizer blades, said stabilizer blades including one more jetting ports to direct fluid from the axial throughbore onto a surface of the well bore;
- and one or more actuating means to selectively direct the fluid through the jetting ports and thereby circulate the fluid;
- and
- (b) Selectively performing a plurality of operations from a group comprising:
- i stabilizing the work string in the well bore by keeping the distance between the stabilizer blades and the surface of the well bore as relatively small;
- ii pumping loss circulation material by circulating fluid through the tool;
- iii jet cleaning the well bore;
- iv using in conjunction with a mud motor to shut down the bit at the shoe to minimise casing wear while pumping;
- v running with a near bit reamer, de-activating the reamer blades at the shoe and bypassing the bit with all mud pumped;
- and
- vi achieving secondary recovery of the ‘drill ahead’ bore protector.
Dependencies are inferred from the claim text.