Introduction to gravel pack techniques
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Transcript of Introduction to gravel pack techniques
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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.