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Disintegrating Compression Set Plug with Short Mandrel

Inactive Publication Date: 2016-10-06
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a tool used in oil and gas drilling to seal off a wellbore. The tool uses a special material called compression set sealing element that is compressed and locked in place using anti-extrusion rings. The tool is secured to a mandrel and a slip ring is used to set the plug in place. The plug can reach a desired position, and then the plug itself breaks down to allow for the delivery of a ball to build pressure in the formation. The plug is designed to disintegrate in the well fluid exposure. The tool is then removed, and a ball is delivered to initiate the fracturing process. The design of the tool ensures a secure and effective seal in the wellbore.

Problems solved by technology

This took a long time and required the milling debris to be removed from the borehole with circulation and / or with various debris retention devices.

Method used

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  • Disintegrating Compression Set Plug with Short Mandrel
  • Disintegrating Compression Set Plug with Short Mandrel
  • Disintegrating Compression Set Plug with Short Mandrel

Examples

Experimental program
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Embodiment Construction

[0010]Referring to the FIG. 1, a slip ring 10 is an initial ring structure of slips that are circumferentially connected with breakable tabs that are not shown so that on setting which forces ring 10 onto cone 12 the resulting slips 14 separate from each other and wedge themselves against the surrounding borehole wall that is not shown. A wireline setting tool 16 of a type well known in the art and sold by Baker Hughes Incorporated as a Model E-4 supports the plug 18 to the desired subterranean location. The setting tool 16 pushes down on sleeve 20, which is a part of the setting tool 16 and comes out of the hole after the plug or packer is set, in the direction of arrow 22. At the same time the setting tool 16 pulls up on sub 24 until the shear stud 48 breaks which allows release of the setting tool 16 from the plug or packer 18. During setting the ring of individual slips 14 splits apart. Collet fingers 28 initially push up bottom sub 26 which takes with it the slips 14 until they...

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PUM

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Abstract

A compression set sealing element preferably 85A-95A TDI-Ester Polyurethane is compressed axially and retained against extrusion by CEM anti-extrusion rings. The compressed state of the sealing element is locked in by a degradable lock ring assembly. The mandrel is secured to an upper end of a slip cone and a breakable slip ring is secured by a wireline setting tool until the set position is reached. The slip ring breaks into segments that are pulled up the slip cone as the setting tool pushes on a sleeve to axially compress the sealing element and lock in the set. The sealing element is retained against extrusion by CEM anti-extrusion rings. When the setting tool is removed a ball seat is exposed for delivery of a ball to build pressure into the formation for fracturing. The entirety of the plug then disintegrates from well fluid exposure.

Description

RELATED APPLICATION[0001]This application is a continuation in part of application Ser. No. 14 / 677,415 filed on Apr. 2, 2015.FIELD OF THE INVENTION[0002]The field of the invention is plugs that disintegrate and more particularly plugs with compression set sealing elements that disintegrate and that further have a shortened mandrel to the top of a slip cone to facilitate the disintegration.BACKGROUND OF THE INVENTION[0003]Fracturing is a process to enhance hydrocarbon delivery from a formation to a surface location. The fracturing is frequently a sequential process where a plug is set and a perforating gun that was run in with the plug is released from the plug and shot into the formation to create fractures. These fractures are then extended with high pressure slurry of proppant or typically mostly sand to open the perforation and hold them open by remaining in the perforation after the high pressure flow is cut off. The zone with the recently produced fractures from the perforating...

Claims

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Application Information

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IPC IPC(8): E21B33/128E21B33/129
CPCE21B33/1291E21B33/128C23C4/123E21B33/1208E21B33/129
Inventor DOANE, JAMES C.HARPER, JASON M.XU, YINGQINGPRATT, BARBARA A.ANDERSON, GARY L.BISHOP, DAVID S.RUFFO, ANTONIO C.TAYLOR, ROBERT J.DAVID, ANTONACQUAYE, DAVID K.
Owner BAKER HUGHES INC
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