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7/27/2019 DownHole Tubular.pdf
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DOWNHOLE TUBULARS
:DRILL PIPE,
CASING TUBE
& TU
Presented By:
Kamal
Hazwan
Mohd
Hafiy
Mohamad
Hazmi
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DOWNHOLE TUBULAR
DRILL PIPE CASING TUBE TUB
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Drill pipe
Is a hollow, thick-walled, steel piping. Comes in variety of sizes, strength of weights (30-33 feet's)
To allow drilling fluid to be prepared through them, down the hand back up the annulus
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Casing
A steel pipe placed in an oil/ gas well as drilling is in progress
Function: to prevent the wall of the hole from caving
during drilling
to provide a mean of extracting petroleum
Type of casing: Surface Casing
Intermediate Casing
Production Casing
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Surface Casing
The casing must be set before drilling can continue further
Function
to protect shallow freshwater aquifers from contamination
to support the unconsolidated, low pressure formations and to
prevent drilling mud loss to provide a base for well control equipment
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Intermediate Casing
One or more intermediate casing can be set depending onthunderground conditions
Function
prevent hole from collapsing
protect freshwater zones from contamination isolate zones with abnormal high or low pressure
isolate salt formation
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Production Casing
Casing runs all the way from the productive zone to the surf
Is a long string of smallest diameter that completes the wellconnecting to the reservoir. Also known as oil string.
Function: To seal off the pay zone from adjacent layers
Used to producing oil or gas and also hold the other equipment doto prevent caving
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Tubing
Is a small diameter pipe (2-3 inches) Set in production casing
Function
Convey the product from producing zone to surface
Convey fluids from surface to producing zone
Proper selection, design & installation are critical part of tcompletion programme to ensure it safe & economical forwell
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Installing tubing
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Tubing design consideration Peak production rate
Depth of well Casing size
Well product
Use of Wire line tools & equipment
Well pressure & temperature
Tubing & annulus differential pressure Tension & compression strength
Corrosion
Stimulation
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Tubing size requirement
Related to Well Performance Analysis
Deliver desired production/injection rate
Avoid inefficient & unnecessary artificial lift
Avoid liquid load up problems especially in two-phase flow owells
Produce/inject at velocity below the erosional velocity Others
Compatible to mechanical constraints i.e. casing size, wellhead res
Corresponding completion accessories available in the market
Suit to logistics requirement
Avoid unnecessary increase in well & equipment costs
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Summary
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Casing Scheme
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Thank You