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Introduction to

Gravel Pack

Module

1 Feb 2 1

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Gravel Pack

SandSand -- GravelGravel -- ScreenScreen Consists of sized

particles placed in theannular space between

an unconsolidated

formation and a

centralized screen.

Open or cased hole.

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GP Hardware Main Components

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Gravel Pack Installation

Hardware is installed with :

Rig

Coiled Tubing (Snub-in)

Wireline

Gravel is transported by fluid in slurry form.

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Cased Hole - Internal Gravel Pack

Perforation Tunnels

Formation Sand

Gravel

Screen

Casing

Blank

Packer 

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Cased Hole - with Service Tool

Inner String -

Service Tool

Outer String

GP PackerCrossover

Blank Pipe Washpipe

Screens

Sump Packer

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IGP Considerations

Isolate production from undesirable zones.

Reliable drilling and completion methodologies. Requires efficient perforation system.

Poor perforation pack may lead to low productivity.

Easier workover compared to EGP.

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Poor Perforation Pack Efficiency

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Open Hole - External Gravel Pack

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EGP Considerations

Can be under-reamed, increasing wellbore area.

No damage due to poor perforation packefficiency.

Hole stability is a concern while drilling and

completion. Horizontal completions

Water production control may becomeimpractical.

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Gravel Pack Systems

Circulation

Squeeze

Wash Down

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Circulation System

Fluid may leak to theformation, circulate

back to the surface orboth.

When pumping slurry,gravel will be placedinside perforation

 tunnels and annularcasing-screen.

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Squeeze System

Fluid leaks to theformation. No returns to the surface.

Fluid may flow inside the screen.

When pumping slurry,gravel will be placedinside perforation

 tunnels and annularcasing-screen.