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Assembly which provides means to latch into a profile in a well bore after bypassing a pre-designated number of identical profiles.

IP.com Disclosure Number: IPCOM000248864D
Publication Date: 2017-Jan-18
Document File: 1 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

The device provides a means to locate and lock into a desired internal groove in a well bore after passing a known number of identical grooves. This then allows for actuation of downhole tools or a known location for performing operations with other tools in the string. It is intended to be conveyed into the well bore by a method which allows application of upward and downward axial loads, for example drill pipe or coiled tubing. The device allows fluid flow through its bore which is isolated from the annulus between tubing and drill pipe/coiled tubing, as is required for actuation of some downhole tools. Figure 1 shows the device in three stages of operation. The device is run through the bore of the Tubing (11) in Figure 1a. A Latch Mandrel (7) features Latch Fingers (7.1) which deflect inward radially to allow the device to pass through the bore. The return force of a compressed Spring (4) prevents the Latch Mandrel from travelling upwards sufficiently to actuate the device. The profile of the Latch Fingers¿ (7.1) outer diameter matches the profile of a groove in the tubing inner diameter (11.1) or in another downhole tool on the tubing string. Upon arriving at this groove the Latch Fingers will spring outwards into the groove. The Latch Fingers¿ (7.1) profile features a downward facing surface, perpendicular to the device centreline. This will contact an upward facing surface in the groove, preventing further downward motion of the Latch Mandrel (7). Application of downward force on the device will compress the Spring (4) and move the remainder of the assembly down. This motion will continue until the angled face of the Sleeve (2) contacts the Latch Fingers (7.1) then forces them inwards radially as shown in Figure 1b. Once the Latch Fingers (7.1) are sufficiently compressed, the Latch Mandrel is free from the tubing groove (11.1) and the Spring (4) will force the Latch Mandrel down to its starting position. Each time the Latch Mandrel (7) locks into a profile and is subsequently released by the Sleeve (2), a Pin (8), fixed to the Indexing Sleeve (6), travels through an Indexing Profile (7.2) on the inner diameter of the Latch Mandrel as illustrated in Figure 2. Neither the Latch Mandrel (7) or Indexing Sleeve (6) is rotationally fixed, thus the motion of the Pin (8) will shift their relative rotational position each time the Latch Fingers locate and release from a profile. After passing a predetermined number of grooved profiles, the Latch Mandrel and Indexing Sleeve will be rotationally aligned such that a Raised Section (6.1) on the outer diameter of the Indexing Sleeve is aligned with the Latch Fingers (7.1). This Raised Section (6.1) prevents the Latch Fingers (7.1) collapsing under downward force from the Sleeve (2) and hence the device will permit no further downward movement past the desired profile. In the configuration depicted in the Figures, the device can be removed from the locked position by applying upward force and lifting it from the tubing profile. This motion will return the Latch Mandrel (7) to its starting position and reset the indexing sequence. It can then be used at another location in the well or removed.

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Assembly which provides means to latch into a profile in a well bore after bypassing a pre-designated number of identical profiles.

The device provides a means to locate and lock into a desired internal groove in a well bore after passing a known number of identical grooves. This then allows for actuation of downhole tools or a known location for performing operations with other tools in the string. It is intended to be conveyed into the well bore by a method which allows application of upward and downward axial loads, for example drill pipe or coiled tubing. The device allows fluid flow through its bore which is isolated from the annulus between tubing and drill pipe/coiled tubing, as is required for actuation of some downhole tools. Figure 1 shows the device in three stages of operation. The device is run through the bore of the Tubing (11) in Figure 1a. A Latch Mandrel (7) features Latch Fingers (7.1) which deflect inward radially to allow the device to pass through the bore. The return force of a compressed Spring (4) prevents the Latch Mandrel from travelling upwards sufficiently to actuate the device. The profile of the Latch Fingers¿ (7.1) outer diameter matches the profile of a groove in the tubing inner diameter (11.1) or in another downhole tool on the tubing string. Upon arriving at this groove the Latch Fingers will spring outwards into the groove. The Latch Fingers¿ (7.1) profile features a downward facing surface, perpendicular to the device centreline. This will contact an upward facing surface in the groove, preventing further downward motion of the Latch Mandrel (7). Application of downward force on the device will compress the Spring (4) and move the rema...