Location
Operator
Well Type & Deviation
Hole Size
Application & Comment
Link
Argentina
Pan Energy
Re-entry, Vertical
6-1/4"
30 wells in 91 days. Increased well productivity and reserves +40%.
Canada
unknown
Re-entry, Vertical
4-3/4"
Used to minimise formation damage. Safer operations. Three laterals.
USA - Alaska
ARCO
Re-entry, Horizontal
3-3/4"
A re-entry operation for cost reduction. Deeper KOP's and gas lift valves.
USA - Alaska
BP
Horizontal
3-3/4"
Minimise formation damage. Safer operations. Three laterals.
USA - California
ARCO
Re-entry, Horizontal
3-3/4" & 4.75
Used CT to drill underbalanced as the wells had old casing and could be damaged easily.
USA - Kansas
Rosewood
S+ Horizontal
6-1/4" - 8-1/2"
Large diameter CTD capability - gyro and whipstock enabled sidetracking.
USA - Ohio
Chuck Henry
Re-entry, Horizontal
3-3/4"
Untapped reserves with tightly constrained target.
USA - Pennsylvania
US Dept Energy
Re-entry, Horizontal
4-3/4"
Gas storage. 9ft thick sands. Improved skin factor. 8,000% increase in deliverability.
USA - Pennsylvania
CNG Transmission
Re-entry, Horizontal
4-3/4"
Very high radius overbalanced wells. Wells showed up to +840% in gas deliverability.
USA - Texas
Oryx
Re-entry, Horizontal
3-7/8"
3 wells. Austin Chalk. Casing exit, drilled the horizontal underbalanced.
USA - Texas
Conoco Phillips
Grassroots,Vertical
6-1/4"
Reduced well times from 3 days to 1 day per well. 33% cost reduction per well.
Venezuela
Lagoven
Pilot holes,Vertical
3-7/8"
Offshore platform. Safe solution to shallow gas risks. 300 wells so far.
Venezuela
Lagoven
Pilot holes,Vertical
12-1/4" & 14-3/4"
4 wells drilled from a platform. Discordance, risk reduction, intermediate casing.
Location
Operator
Well Type & Deviation
Hole Size
Application & Comment
Link
Algeria
Sonatrach
Re-entry, Horizontal
3-3/4"
Drilled with native crude and N2. Both technical and economic benefits gained.
Oman
PDO
Re-entry, Deviated
3-3/4" - 4-1/8"
First 3 trial wells led to continued usage. Hybrid rig, multi field use.
UAE - Dubai
DME
Re-entry, Horizontal
3-3/4"
High temp and high H2S. One well had 8 laterals / 12,476ft drilled.
Location
Operator
Well Type & Deviation
Hole Size
Application & Comment
Link
France
Lundin
Re-entry, Horizontal
6"
Open hole sidetrack performed on depleted carbonate reservoir. Drilled underbalanced.
Holland
Shell / Nam
Re-entry, Horizontal
4-1/8"
Successful CTD trial in 1993. Sodium formate fluid.
Italy
ENI
Re-entry,Vert & Deviated
unknown
2" CT was used as completion string allowing dual completion and 2 zone production.
Norway
BP Norge
Re-entry, Horizontal
3-7/8"
Offshore platform, sidetracks completed. Field life extension, improved productivity.
UK - North Sea
Shell
Re-entry, Horizontal
3-3/4" - 3-7/8"
Offshore platform. Laterals drilled underbalanced. Highly depleted reservoir.
