Top down cement plug and method

Patent metadata

Field	Value
Publication number	US-11506015-B2
Application number	US-202017091682-A
Country	US
Kind code	B2
Filing date	Nov 6, 2020
Priority date	Nov 6, 2020
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A cementing plug including a wiper portion, an engagement section attached to the wiper portion, the engagement section including an engagement feature configured to release at a selected threshold pressure related to cement forming an annular structure about a fracturing device.

First claim

What is claimed is:

1. A cementing plug comprising:
a wiper portion;
an engagement section attached to the wiper portion, the engagement section including an engagement feature having a feature face, the same feature face configured to engage and then release shoulders of sequential fracturing devices in a borehole, the release occurring at a selected threshold pressure related to cement forming an annular structure about individual ones of the sequential fracturing devices.

2. The plug as claimed in claim 1 wherein the selected threshold pressure is that pressure calculated for a particular well to fill an annular space defined between the fracture device and a borehole wall.

3. The plug as claimed in claim 1 wherein the engagement feature releases when cement pressure against the plug reaches about 1000 psi.

4. The plug as claimed in claim 1 wherein the engagement section comprises a collet.

5. The plug as claimed in claim 1 wherein the engagement section comprises a drag block.

6. The plug as claimed in claim 1 wherein the engagement section comprises a bow spring.

7. A wellbore comprising:
a formation;
a borehole in the formation;
a plug as claimed in claim 1 disposed in the borehole.

8. A method for cementing an existing wellbore comprising:
running a plug having a wiper portion;
an engagement section attached to the wiper portion, the engagement section including an engagement feature configured to release at a selected threshold pressure related to cement forming an annular structure about a fracturing device into a borehole of the wellbore;
pumping cement into the borehole behind the plug;
landing the plug in a drilled out fracturing device; and
squeezing cement through ports of the drilled out fracturing device.

9. The method as claimed in claim 8 wherein the landing is on a shoulder of a sleeve of the drilled out fracturing device.

10. The method as claimed in claim 8 wherein the cementing is top down.

11. The method as claimed in claim 8 further comprising automatically deflecting a collet finger upon the cement reaching the selected threshold pressure.

12. The method as claimed in claim 11 further comprising conveying the plug to the next adjacent drilled out fracturing device.

13. The method as claimed in claim 8 wherein the method is carried out automatically upon achieving the selected threshold pressure in the cement.

14. The method as claimed in claim 8 wherein the method further comprises drilling the plug out if the selected pressure threshold is not reached and running a new plug to restart the method.

Assignees

• Casanova Gabriel
• Baker Hughes Oilfield Operations Llc

Inventors

• Casanova Gabriel

Classifications

• E21B33/14 Primary

  for cementing casings into boreholes · CPC title

• E21B37/10

  Well swabs · CPC title

• E21B33/165 Primary

  Cementing plugs specially adapted for being released down-hole (cementing heads E21B33/05) · CPC title

• E21B33/1204

  permanent; drillable · CPC title