Browse Prior Art Database

Packer setting tool for liner drilling application

IP.com Disclosure Number: IPCOM000247329D
Publication Date: 2016-Aug-24
Document File: 1 page(s) / 84K

Publishing Venue

The IP.com Prior Art Database

Abstract

The intent of the design is to have a combined tool that protects the PBR bore during drilling, be able to rotate the liner during cementing and to set the packer after the cementing operation. The new steerable liner drilling system is capable of drilling and logging a directional well, setting and cementing the liner in just one run, including the activation of the liner hanger and the packer. It consists of an outer and an inner string, containing a pilot BHA with a rotary steerable at its lower end for directional control. The hole is enlarged with an under-reamer for the final size required by the liner, which is run in parallel to the inner string. Both strings are connected by a running tool, which can transmit torque and longitudinal forces. It can be attached to the liner string at various locations to allow the operating sequences of drilling, reaming, and cementing. In order to fulfill these functions without tripping in between, all required components such as the liner hanger and packer, and the flapper valve have to be integrated in the liner and the related activation devices have to be integrated in the inner string. While pumping cement, the liner has to be rotated to ensure a proper distribution of the cement in the outer annulus. After cementing, the liner packer has to be set as soon as possible, and the number of operational steps before pulling out the inner string have to be minimized to reduce the operational risk. This invention describes a packer setting tool, which allows the running tool to be connected in the PBR and to rotate the liner while cementing and to set the packer directly afterwards. The setting operation is performed by a simple reciprocating movement of the inner string by picking up and setting down weight, eliminating the need for additional repositioning or the activation of downhole tools by mud-telemetry. The tool has splines at the bottom which engage with the packer mandrel at all times up until the operational sequence of setting the packer has begun. Once the hanger is set, cement is pumped down hole to cement the liner in place. As cement is displaced, the inner string that is engaged to the packer tool is rotated to rotate the liner. Torque is transmitted from the inner string to the packer setting tool, which then transmits torque through the splines that are engaged to the packer mandrel and eventually to the long liner. After cementing is complete, the inner string engages a profile on the packer setting tool to disengage the tool from the cemented liner by an upward pull which will shear release the tool. The tool has a collet which is constantly energized with a preloaded spring below it. However it is restricted from any axial movement due to the restraint from the PBR on the OD and the PBR protector sleeve on the ID. The ID of the collet sits inside a recessed machined profile that prevents the collet from moving upwards until the OD restriction is removed. As the tool is pulled further upwards, the collet reaches an unrestricted profile on the OD where the stiffness and spring action of the collet allows the collet to release from the restriction. The pre-loaded spring below the collet further pushes the collet upwards. In an alternate design, the pre-loaded spring is not needed, if the collet can provide sufficient radial spring action to engage with the PBR. As the collet releases itself, the tool is then pushed downwards to set the packer. At this point the collet engages a profile on the PBR. Further weight is applied and the PBR shear releases the packer to eventually set the packer to isolate the annulus. A predefined weight is required to set the packer. The shear check load mechanism present on the tool helps determine how much weight/force was applied to the packer giving a positive indication of the amount of force when the inner string is pulled up to the rig floor.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 51% of the total text.

Packer setting tool for liner drilling application

The intent of the design is to have a combined tool that protects the PBR bore during drilling, be able to rotate the liner during cementing and to set the packer after the cementing operation. The new steerable liner drilling system is capable of drilling and logging a directional well, setting and cementing the liner in just one run, including the activation of the liner hanger and the packer. It consists of an outer and an inner string, containing a pilot BHA with a rotary steerable at its lower end for directional control. The hole is enlarged with an under-reamer for the final size required by the liner, which is run in parallel to the inner string. Both strings are connected by a running tool, which can transmit torque and longitudinal forces. It can be attached to the liner string at various locations to allow the operating sequences of drilling, reaming, and cementing. In order to fulfill these functions without tripping in between, all required components such as the liner hanger and packer, and the flapper valve have to be integrated in the liner and the related activation devices have to be integrated in the inner string. While pumping cement, the liner has to be rotated to ensure a proper distribution of the cement in the outer annulus. After cementing, the liner packer has to be set as soon as possible, and the number of operational steps before pulling out the inner string have to be minimized to reduce the operational risk. This invention describes a packer setting tool, which allows the running tool to be connected in the PBR and to rotate the liner while cementing and to set the packer directly afterwards. The setting operation is performed by a simple reciprocating movement of the inner string by picking up and setting down weight, eliminating the need for additional repositioning or the activation of downhole tools by mud-telemetry. The tool has splines at the bottom which engage with the packer mandrel at all times up unt...