Industry CTD Case Studies

Location

Operator

Well Type

& Deviation

Application & Comments

Hole Size

Used to minimise formation damage.

Safer operations. Three laterals.

4-3/4"

Re-entry,

Vertical

Canada

USA - Alaska

ARCO

Re-entry,

Horizontal

3-3/4"

Horizontal

BP

USA - Alaska

30 wells in 91 days. Increased well productivity and reserves +40%.

6-1/4"

Re-entry,

Vertical

Pan American Energy

Argentina

unknown

Rosewood

USA - Kansas

USA - California

ARCO

Re-entry,

Horizontal

3-3/4" & 4.75

USA - Pennsylvania

US Dept Energy

Chuck Henry

USA - Ohio

3-3/4" 

USA - Texas

Oryx

CNG Transmission

USA - Pennsylvania

Link

THE AMERICAS

Venezuela

Lagoven

Conoco Phillips

USA - Texas

Venezuela

Lagoven

Location

Operator

Well Type

& Deviation

Application & Comments

Hole Size

Link

MENA

First 3 trial wells led to continued usage. Hybrid rig, multi field use.

3-3/4" - 4-1/8"

Re-entry,

Deviated

Oman

UAE - Dubai

DME

Re-entry,

Horizontal

3-3/4"

High temp and high H2S. One well had 8 laterals / 12,476ft drilled.

Drilled with native crude and N2. Both technical and economic benefits gained.

3-3/4"

Re-entry,

Horizontal

Sonatrach

Algeria

PDO

Location

Operator

Link

EUROPE

Holland

Italy

ENI

Lundin

France

Shell / Nam

Norway

UK - North Sea

Shell

BP Norge

Well Type

& Deviation

Re-entry,

Horizontal

Re-entry,

Horizontal

Re-entry,

Vert & Deviated

Re-entry,

Horizontal

Re-entry,

Horizontal

3-3/4" - 3-7/8"

3-7/8"

unknown

4-1/8"

6"

Hole Size

Application & Comments

Open hole sidetrack performed on depleted carbonate reservoir. Drilled underbalanced.

Successful CTD trial in 1993. Sodium formate fluid.

2" CT was used as completion string allowing dual completion and 2 zone production.

Offshore platform, sidetracks completed. Field life extension, improved productivity.

Offshore platform. Laterals drilled underbalanced. Highly depleted reservoir

4-3/4" 

6-1/4" 

S+ Horizontal

Re-entry,

Horizontal

Re-entry,

Horizontal

Re-entry,

Horizontal

Re-entry,

Horizontal

Grassroots,

Vertical

Pilot holes,

Vertical

Top hole,

Vertical

3-7/8"

12-1/4" & 14-3/4" 

3-7/8"

4-3/4"

6-1/4" - 8-1/2"

3-3/4"

Minimise formation damage. Safer operations. Three laterals.

A re-entry operation for cost reduction. Deeper KOP's and gas lift valves.

Large diameter CTD capability - gyro and whipstock enabled sidetracking.

Gas storage. 9ft thick sands. Improved skin factor. 8,000% increase in deliverability.

Very high radius overbalanced wells. Wells showed up to +840% in gas deliverability.

3 wells. Austin Chalk. Casing exit, drilled the horizontal underbalanced.

Untapped reserves with tightly constrained target.

Used CT to drill underbalanced as the wells had old casing and could be damaged easily.

4 wells drilled from a platform. Discordance, risk reduction, intermediate casing.

Offshore platform. Safe solution to shallow gas risks. 300 wells so far.

Reduced well times from 3 days to 1 day per well. 33% cost reduction per well.‚Äč

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