10.03 homco internal steel liner casing...

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HOMCO Internal Steel LinerCasing Patch

22 © 2006-2010 Weatherford. All rights reserved.

®

HOMCO Internal Steel Liner Casing Patch

Fast, Permanent Casing Leak Repairs with the HOMCO Steel Liner Casing Patch

Designed to seal perforations, collar and thread leaks, splits and limited

corroded areas in tubing and casing and to provide added protection

during squeeze jobs, the HOMCO internal steel liner casing patch is

as versatile as it is effective to any depth.

The HOMCO patch has repeatedly sealed leaks and perforations where

cementing efforts have failed, including in production wells, wells that

must be deepened after patching and disposal storage wells. The patch

is permanent yet can be removed from the wellbore by milling.

Applications

Slide (circulating) valve

Bumper jar

Holddown

Dual cylinder

Liner

Safety joint

Cone

Collet

Bull plug

3© 2006-2010 Weatherford. All rights reserved.

Advantages

The HOMCO patch offers significant advantages over other

sealing methods.

Repairs are made quickly. Total setting time is limited only by

roundtrip time.

Operations can be resumed as soon as the setting tool is pulled

and the patch is pressure tested.

Steel makes the seal and is resistant to cracking and crumbling.

An epoxy resin, spread on a fiberglass mat covering the outside

diameter of the steel liner, is extruded into leaks and cavities in the

casing wall and acts as a gasket and secondary sealing agent.

The setting tool is designed for twice the required operating pressure.

The casing patch is available in 20-ft (6.1-m) lengths, which can be

made up to several hundred feet.

Weatherford has a complete line of tools and patches for more than

60 different sizes and weights of tubing and casing between 2-7/8

and 26 in.

The casing patch is available worldwide through all Weatherford

service locations.

Thick (1/8-in.) liners are available for normal patching operations.

A new, heavier-wall liner has been developed and successfully used

and is now available for higher-pressure operations. Also available on

request are a special liner material for highly corrosive conditions and

a material for high-temperature wells (600°F/316°C).

Patches can be run through and set below previously installed patches

of the same type.

Installation of the HOMCO internal steel liner casing patch is only

by qualified Weatherford personnel using special setting tools

and techniques.

Speed

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Reliability

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Versatility

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21 3

Installation Sequence

The setting tool is assembled.

The patch is sized to the casing.

The expander assembly,

extensions and casing patch are

placed on the lower piston rod.

After the steel liner is coated with

epoxy resin, the tool is run into the

string. The liner is positioned

across the leak area.

Leak

Patch material

Expander assemblyCollet

Lower piston rod

Hydraulic holddown

Circulating valve

Tubing is raised to

close the circulating

valve.

Hydraulic pressure is

applied to force out

buttons on the hydraulic

holddown, anchoring

the cylinder firmly and

isolating the workstring

from all tensile loads

caused by the setting

operations.

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5

The HOMCO casing patch is an

internal steel liner with a standard

wall thickness of 1/8 in. Available in

20-ft (6.1-m) lengths, the patch is

corrugated longitudinally to provide

clearance for running inside casing.

Covered with a glass mat and coated

with epoxy resin, the patch is

expanded to conform symmetrically

to the casing bore.

Casing diameter is reduced by 0.30 in.

(7.62 mm), using the standard 1/8-in.

liner, and by 0.48 in. (12.20 mm),

using the heavier-wall liner. Special

liners are available for high-pressure

and high-temperature operations as

well as hydrogen sulfide, carbon

dioxide and corrosive conditions.

54

A more detailed casing patch

installation procedure and technical

manual are available on request.

Pressure on the

underside of the piston

pulls the expander

assembly into the

bottom of the corrugated

patch. As pressure

increases, the expander

assembly is forced

farther into the patch,

expanding it against the

inside of the casing.

Five feet of patch can be

expanded in one stroke.

The circulating valve is

opened by lowering the

tubing and telescoping

the slide valve. The

tubing is raised again to

pull up the cylinders in

relation to the pistons

held down by the

expander assembly.

The expanded section

of patch is anchored to

the casing wall by the

friction caused by

compressive hoop

stress. Hydraulic

pressure is again

applied to the tubing

after the circulating valve

is closed. The hydraulic

holddown buttons are

expanded to anchor

the cylinder in a new,

higher position.

The expander

assembly is again

forced through the

corrugated patch,

expanding it against

the inside of the

casing. This

procedure is

continued until the

entire patch is set.

The epoxy resin

coating (that was

applied in step 1)

is extruded into any

leaks or cavities in

the casing wall and

acts as a gasket and

additional sealing

agent. Setting time

normally requires

less than 30 minutes

for a 20-ft (6.1-m)

patch. The tool is

then removed from

the hole, and the

patch is pressure

tested as required.

© 2006-2010 Weatherford. All rights reserved.

®



Real Results

The HOMCO internal steel liner casing patch is recognized worldwide as a cost-effective casing remediation

system. Using special setting tools and techniques, skilled Weatherford personnel have installed more than

10,000 patches to date. Following are some examples.

Well Client Weatherford Location

Casing Size

(in.)

Liner Length

(ft/m )

Setting Depth (MD)

(ft/m ) Type of Leak

Fencher Louisville Gas & Electric Jane Lew , West Virginia, USA 4-1/220

6.1

175

53Corrosion

Not Available Acclaim Energy Nisku, Alberta, Canada 5-1/260

18.3

334.75

102Split casing

Not Available Petrovera Resources Nisku, Alberta, Canada 720

6.1

1,671

509Perforations

16 / 26 Well B 29 Brittannia Operator UK Ltd Aberdeen, Scotland, UK 9-5/828

8.5

16,630

5,069 Split casing

D-114 Thums Long Beach Company Rancho Dominguez, California, USA 8-5/860

18.3

4,300

1,311Corrosion

Johnson 5-5 ExxonMobill - Jay Laurel, Mississippi, USA 7-5/840

12.2

14,190

4,325Other

Crow ell 1D Burlington Resources Lake Charles, Louisiana, USA 7-5/820

6.1

7,673

2,339Collar leak

27 CDX Gas LLC Farmington, New Mexico, USA 5-1/260

18.3

1,071

326Corrosion

SA 14 ExxonMobil Company Santa Paula, California, USA 2620

6.1

1,516

462Perforations

HE 33 ExxonMobil Company Santa Paula, California, USA 2620

6.1

1,516

462Perforations

2 Sandia Technology Williston, North Dakota, USA 9-5/830

9.1

3,707

1,130Collar leak

NORMADON 1 Chesapeake Operating Corpus Christi, Texas, USA 4-1/230

9.1

10,298

3,139Perforations

George Riebe Setex Oil & Gas Bridgeport, Texas, USA 4-1/230

9.1

545

166Collar leak

Singleton Star Energy Aberdeen, Scotland, UK 13-3/840

12.2

53

16Split casing

Mustang Sally No. 1-9 ExxonMobil West Texas, USA 5-1/2220

67

1,495

456Corrosion

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7

Pressure Capacities

© 2006-2010 Weatherford. All rights reserved.

®


1 or less 25.4 9,850 679.13 2,500 172.37

2 50.8 4,925 339.44 1,700 117.21

3 76.2 3,283 226.35 800 55.15

1 or less 25.4 9,850 679.13 1,850 127.55

2 50.8 4,925 339.44 1,300 89.63

3 76.2 3,283 226.35 750 51.71

1 or less 25.4 9,850 679.13 1,200 82.74

2 50.8 4,925 339.44 950 65.50

3 76.2 3,283 226.35 700 48.26

1 or less 25.4 9,850 679.13 1,100 75.84

2 50.8 4,925 339.44 875 60.32

3 76.2 3,283 226.35 650 44.81

1 or less 25.4 9,850 679.13 1,000 68.94

2 50.8 4,925 339.44 800 55.15

3 76.2 3,283 226.35 600 41.36

1 or less 25.4 9,850 679.13 900 62.05

2 50.8 4,925 339.44 700 48.26

3 76.2 3,283 226.35 550 37.92

1 or less 25.4 9,850 679.13 800 55.15

2 50.8 4,925 339.44 650 44.81

3 76.2 3,283 226.35 500 34.47

1 or less 25.4 9,850 679.13 750 51.71

2 50.8 4,925 339.44 600 41.36

3 76.2 3,283 226.35 450 31.02

1 or less 25.4 9,850 679.13 600 41.36

2 50.8 4,925 339.44 500 34.47

3 76.2 3,283 226.35 400 27.57

13-3/8 1/8

8-5/8 1/8

9-5/8 1/8

10-3/4 1/8

7-5/8 1/8

5-1/2 1/8

6-5/8

Casing

OD

(in.)

Liner

Wall

(in.)

Leak Size

(in./mm )

Internal Pressure

(PSI/bar )

7 1/8

1/8

4-1/2 1/8

External Pressure

(PSI/bar )

weatherford.com © 2006-2010 Weatherford. All rights reserved. 10.04

Weatherford products and services are subject to the Company's standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in the applicable contract between Weatherford and the client.

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