# US 2021/0340841 A1 · Removable Core Wiper Plug

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- Number: US 2021/0340841 A1
- Document ID: US20210340841A1
- Status: Published application
- Kind: A1
- Application number: 17/377,182
- Filed: 2021-07-15
- Published: 2021-11-04
- Earliest claimed: 2020-02-10
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Halliburton Energy Services, Inc.
- Inventors: Gunnar LENDE; Tor SAETRE
- Web page: https://patentgrep.com/patent/US20210340841A1

## CPC

- E21B 33/16: using plugs for isolating cement charge; Plugs therefor {(stage cementing E21B33/146; spacer compositions C09K8/424)}
- E21B 31/12: Grappling tools, e.g. tongs or grabs
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

Provided are wiper plugs with removable cores and methods of using the wiper plugs with removable cores. An example wiper plug with a removable core comprises a molded body, a wiper, a cavity through the interior of the molded body, a support disposed in the cavity, and the removable core disposed in the cavity. An example method of use comprises removing the core of the wiper plug without drilling through the wiper plug, and leaving the remainder of the wiper plug in the wellbore.

## Claims

### Claim 1

A wiper plug with a removable core comprising:
a molded body,
a wiper,
a cavity through the interior of the molded body,
a support disposed in the cavity, and
the removable core disposed in the cavity.

### Claim 2 (depends on 1)

The wiper plug of claim 1, further comprising an uphole covering.

### Claim 3 (depends on 2)

The wiper plug of claim 2, wherein the uphole covering is an uphole breakable covering or an uphole rupturable covering.

### Claim 4 (depends on 1)

The wiper plug of claim 1, further comprising a downhole covering.

### Claim 5 (depends on 4)

The wiper plug of claim 4, wherein the downhole covering is a downhole breakable covering or a downhole rupturable covering.

### Claim 6 (depends on 1)

The wiper plug of claim 1, wherein the core is solid and comprises a neck configured to be fished.

### Claim 7 (depends on 1)

The wiper plug of claim 1, wherein the core comprises a fluid.

### Claim 8 (depends on 1)

The wiper plug of claim 1, wherein the core comprises a honeycomb material.

### Claim 9 (depends on 1)

The wiper plug of claim 1, wherein the core comprises a matrix with bubbles.

### Claim 10

A method for removing the core of a wiper plug, the method comprising:
introducing the wiper plug comprising:
a molded body,
a wiper,
a cavity through the interior of the molded body,
a support disposed in the cavity, and
a removable core disposed in the cavity;
removing the core of the wiper plug without drilling through the wiper plug; and
leaving the remainder of the wiper plug in the wellbore.

### Claim 11 (depends on 10)

The method of claim 10, wherein the removing the core comprises breaking an uphole breakable covering of the wiper plug and draining a fluid from the cavity.

### Claim 12 (depends on 10)

The method of claim 10, wherein the removing the core comprises rupturing an uphole rupturable covering of the wiper plug and draining a fluid from the cavity.

### Claim 13 (depends on 10)

The method of claim 10, wherein the removing the core comprises rupturing an uphole rupturable covering of the wiper plug and compressing a honeycomb material.

### Claim 14 (depends on 10)

The method of claim 10, wherein the removing the core comprises rupturing an uphole rupturable covering of the wiper plug and compressing a matrix with bubbles.

### Claim 15 (depends on 10)

The method of claim 10, wherein the removing the core comprises fishing a solid core comprising a neck and retrieving the solid core from the wiper plug.

### Claim 16 (depends on 10)

The method of claim 10, further comprising deploying a cement tagging tool through the wiper plug.

### Claim 17 (depends on 16)

The method of claim 16, further comprising tagging a cement with the cement tagging tool.

### Claim 18

A system for removing a core from a wiper plug, the system comprising:
the wiper plug comprising:
a molded body,
a wiper,
a cavity through the interior of the molded body,
a support disposed in the cavity, and
the removable core disposed in the cavity;
a tubular in which the wiper plug is disposed; and
a cement located downhole of the wiper plug.

### Claim 19 (depends on 18)

The system of claim 18, wherein the removable core comprises a fluid, a honeycomb material, a foam, a matrix with bubbles, or a solid material comprising a neck.

### Claim 20 (depends on 18)

The system of claim 18, wherein the wiper plug further comprises an uphole breakable covering or an uphole rupturable covering.