oil & gas well integrity - energy.gov€¦ · as more and more oil and gas drilling moves into...

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1 2 3 4 cement and casing failure are the 1st and 3rd highest contributing factors to well blowouts. A steel casing is the inside layer of separation between drilling fluid and rock. Cement comprises the outside separation layer. Drilling fluid is a mud-like mixture pumped into the wellbore in order to stabilize pressure. ENSURES STRUCTURAL STABILITY FOR SAFE & LONG-TERM OPERATIONS MAJORITY OF FEDERAL WATERS NOW OPEN FOR OFFSHORE DRILLING The drill string sits in the center, and consists of the drill pipe, drill collars, and a drill bit. Wellbore Configuration Diagram by Cstricklan is licensed under CC BY-SA 4.0 AT A WELLBORE & BARRIER SYSTEM FIRST LET’S LOOK BUT SOMETIMES IN FACT, FAILS THE BARRIER SYSTEM WELL INTEGRITY PREDICTING CASING CORROSION PREDICTING CEMENT DEGRADATION PREDICTING OVERALL BOREHOLE STABILITY Maintained by the rock-cement-casing barrier systems As more and more oil and gas drilling moves into extreme offshore environments, it is critical that barrier systems are designed to prevent failure and maintain near and long term control of the well. NETL’s unique set of lab testing equipment can test different casing and cement materials to predict what subsurface conditions allow for optimum performance and which conditions may lead to failure. ROCK CEMENT DRILLING/COMPLETION FLUID CASING Hydrogen sulfide, carbon dioxide and fluid in the formation can degrade the cement. Mechanical stress induced by heat can cause the cement to fracture and the casing to buckle. The harsher the environment, the more likely the cement will fail. Post-drilling pressure from the wellbore exerts stress on the steel casing, attacking from within. NETL’S Unique Set of Lab Testing Equipment Can Help! Source: Izon et al 2007 https://edx.netl.doe.gov/offshore OIL & GAS WELL INTEGRITY R&D CAPABILITIES NETL’S

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Page 1: OIL & GAS WELL INTEGRITY - Energy.gov€¦ · As more and more oil and gas drilling moves into extreme offshore environments, it is critical that barrier systems are designed to prevent

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cement and casing failure are the 1st and 3rd highest contributing factors to well blowouts.

A steel casing is the inside layer of separation between drilling fluid and rock.

Cement comprises the outside separation layer.

Drilling fluid is a mud-like mixture pumped into the wellbore in order to stabilize pressure.

ENSURES STRUCTURAL STABILITY FOR SAFE & LONG-TERM OPERATIONS

M A J O R I T Y O F F E D E R A L W AT E R S N O W O P E N F O R O F F S H O R E D R I L L I N G

The drill string sits in the center, and consists of the drill pipe, drill collars, and a drill bit.

Wellbore Configuration Diagram by Cstricklan is licensed under CC BY-SA 4.0

AT A WELLBORE & BARRIER SYSTEM

FIRSTLET’S LOOK

BUTSOMETIMES

IN FACT,

FAILS

THE BARRIER SYSTEM

WELL I N T E G R I T Y

PREDICTING CASING CORROSION

PREDICTING CEMENT DEGRADATION

PREDICTING OVERALL BOREHOLE STABILITY

Maintained by the rock-cement-casing barrier systems

As more and more oil and gas drilling moves into extreme offshore environments, it is critical that barrier systems are designed to prevent failure and maintain near and long term control of the well.

NETL’s unique set of lab testing equipment can test different casing and cement materials to predict what subsurface conditions allow for optimum performance

and which conditions may lead to failure.

RO

CK

CEM

ENT

DR

ILLI

NG/

COM

PLET

ION

FLU

ID

CASI

NG Hydrogen sulfide, carbon dioxide and

fluid in the formation can degrade the cement. Mechanical stress induced by heat can cause the cement to fracture and the casing to buckle. The harsher the environment, the more likely the cement will fail.

Post-drilling pressure from the wellbore exerts stress on the steel casing, attacking from within.

NETL’S Unique Set of Lab Testing Equipment Can Help!

Source: Izon et al 2007

https://edx.netl.doe.gov/offshore

OIL & GAS WELL INTEGRITY R&D CAPABILITIES

NETL’S