Inflatable Expanded Liner Hanger Assembly with Weight Set Liner Top Packer

Abstract

An assembly and method for hanging, cementing and sealing a liner to an existing tubular uses an inflatable to set the hanger. The running tool then releases the liner string and a cement job can take place. The Cement is pushed with darts out of the liner into the surrounding annulus to set up. Displaced fluids are pushed through the liner hanger as the cement advances. The running tool is picked up to land on a setting sleeve for a liner top packer so that set down weight can be applied to set the liner top packer. The running string then pulls out the running tool out of the hole.

Claims

1. A borehole completion method, comprising: running in a liner string with a hanger and liner top packer on a running tool supported by a running string; positioning said liner string in an overlapping relation to an existing string; setting said hanger with an inflatable supported by said running tool; releasing said running tool from said liner string; setting said liner top packer with setting down weight on said running string.

2. The method of claim 1, comprising: setting the entirety of said hanger without repositioning said inflatable.

3. The method of claim 1, comprising: setting at least a part of said hanger with said inflatable in a run in position; deflating and repositioning said inflatable to further expand said liner hanger.

4. The method of claim 1, comprising: providing pressure through said running string to inflate said inflatable.

5. The method of claim 5, comprising: releasing said running tool from said liner string after said setting said hanger; deflating said inflatable.

6. The method of claim 5, comprising: repositioning said running tool to allow at least one dog to extend; landing said at least one dog on a setting sleeve for said liner top packer to enable setting said liner top packer with weight set down on said running string.

7. The method of claim 6, comprising: removing said inflatable with said running string.

8. The method of claim 1, comprising: cementing through said running string after said releasing.

9. The method of claim 1, comprising: circulating through said running string to displace completion fluid.

10. The method of claim 9, comprising: locating said liner string in open hole before said circulating.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0007] The FIGURE shows the component layout in a borehole for practicing the method.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0008] A liner string 10 is located below a hanger 12 with a liner top packer 14 located further uphole. The running string 16 supports a packer setting tool 18 which can be one or more dogs 20 that extend out and are set down on a setting sleeve 22 for the packer 14 after the inflatable 24 inflates to set the hanger 12. The hanger 12 can be fully set with a single inflation of the inflatable 24 or the hanger 12 can be expanded in stages with the inflatable 24 inflated, then deflated and repositioned to complete the setting of the hanger 12. The running tool can be released after the first inflation of the inflatable 24 to allow the inflatable to be repositioned to finish setting the liner hanger 12. Hanger 12 has spaced slips to allow fluid flow when expanded radially by the inflatable 24 against an existing tubular that is not shown. With the slips of the hanger 12 extended to support the liner string 10 from the existing tubular, the running string 16 with the packer setting tool 18 are released from the liner string 10 that is now independently supported.

[0009] At this point there are two options. If the liner string 10 is part of an open hole completion, then the inflatable 24 is deflated and the completion fluid is displaced with circulation. The running string 16 is picked up and the dogs 20 are allowed to spring out radially so that on setting down weight the dogs 20 land on sleeve 22 to set the liner top packer 14 against the surrounding tubular that is not shown.

[0010] On the other hand if the liner string 10 is to be cemented, the inflatable 24 is deflated and cement is pumped through the running string 16 and the liner string 10. One or more wiper darts that are not shown are released from the lower end of the packer setting tool to displace cement out a shoe on the lower end of the liner string 10 in a known manner. The packer setting tool 18 is raised to extend the dogs 20 out so that on setting down weight on the running string 16 the dogs 20 push on the setting sleeve 22 to set the liner top packer 14. Those skilled in the art will appreciate that the liner hanger 12 and the inflatable 24 that sets it are run in together and in alignment. The setting of the hanger 12 can happen quickly and reliably with pumping fluid into the inflatable which preferably can run the length of the hanger 12. In that manner the inflatable 24 does not need to be repositioned to fully expand the liner hanger 12. Release of the inflatable can also be quickly accomplished with deflation. The pressure buildup during inflation can be seen at the surface as a signal that the liner hanger has been set. Another signal that the hanger 12 is set is that the amount of hanging weight declines as the weight of the liner string 10 is taken up by the existing tubular that is not shown. The assembly of an anchor, stroker and swage that was used before to set the liner hanger is far more expensive to supply and operate. Frequently several cycles of anchoring and stroking to move the swage were needed to fully expand the liner hanger and release the running string from the liner string.

[0011] The above description is illustrative of the preferred embodiment and many modifications may be made by those skilled in the art without departing from the invention whose scope is to be determined from the literal and equivalent scope of the claims below: