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Introduction to gravel pack techniques
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Introduction to gravel pack techniques
Gravel Pack...
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Omotoso Adedapo
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Gravel Pack
Consists of sized particles placed in the annular space between an unconsolidated formation and a centralized screen.
Open or cased hole.
Sand - Gravel - Screen
GP Hardware Main Components
Gravel Pack Installation
Hardware is installed with : Rig Coiled Tubing (Snub-in) Wireline
Gravel is transported by fluid in slurry form.
Cased Hole - Internal Gravel Pack Packer Blank Casing
Screen
Gravel
Formation Sand
Perforation Tunnels
Cased Hole - with Service Tool Outer String
Inner String Service Tool
GP Packer Crossover Blank Pipe
Screens Sump Packer
Washpipe
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.
Poor Perforation Pack Efficiency
Open Hole - External Gravel Pack
EGP Considerations
Can be under-reamed, increasing wellbore area.
No damage due to poor perforation pack efficiency.
Hole stability is a concern while drilling and completion.
Horizontal completions
Water production control may become impractical.
Gravel Pack Systems
Circulation
Squeeze
Wash Down
Circulation System
Fluid may leak to the formation, circulate back to the surface or both.
When pumping slurry, gravel will be placed inside perforation tunnels and annular casing-screen.
Squeeze System
Fluid leaks to the formation. No returns to the surface.
Fluid may flow inside the screen.
When pumping slurry, gravel will be placed inside perforation tunnels and annular casing-screen.
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