inaccessible well areas beneath completion collapse and axially - - PowerPoint PPT Presentation

Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars:

Gunstring design & selection

2019-NAPS-6.4

AUTHORS: Max Maouche, Archer. DALLAS - FORT WORTH. AUGUST 5-6, 2019.

Re-Perforating beneath axially displaced tubulars

Agenda

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Background
• Tubular Axial Displacement type and shape
• Flexible Perforating system requirement & design
• Pre-Operation Flexible Perforating system test
• Flexible Perforating system selection system selection
• Conclusion

Background

Subsidence and Geoformation impact on downhole tubulars

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Some of the most famous Norwegian Field have been

suffering from formation faulting or compaction.

• North-Sea chalk pore pressure dropping lead to subsidence

in many fields

• 1987 “Great Jack-Up” Operation lifted 6 meters, 5 out of 7

platforms

• Localized formation movement due to intensive reservoir

treatment

Tubular Axial Displacement

2 Main types of axially displaced completion

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Tubular Axial Displacement

2 Main types of axially displaced completion

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Flexible Perforating system design

Prerequisite for Perforating System

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• As Slim as possible
• Highly Flexible and easily interchangeable offshore
• Multiple intervals should be perforated in one run
• Minimum exit hole diameter of 0.18 inch through

expectionally thick liner ( wall thickness ˃ 1.1”)

• Target : 6 5/8” Liner #65.8lbs/ft _ ID:4,375 ”
• Orientation of perforated holes to be at 6 o’clock.
• All perforating guns and accessories should be easily

interchangeable offshore to ease gunstring selection

• Quickly available for Offshore Operation

Flexible Perforating system design

Selected Single and Multishot Perforating solutions

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Maximum Outer Diameter : 2 inch
• Single-Shot or Multi-Shot guns
• Reduced gun length
• Integrated addressable firing system
• Self-Orienting Guns to minimize perforating accessories.
• Charges selected exit holes exceeded the requirements

through the heavy 6 5/8” Liner (#65.8lbs/ft)

• Bolted Gun system to increase flexible capacity
• All feed-through subsystems compatible and

interchangeable : Knuckle Joint, Rotating Swivel, Variball Roller,eccentralizer,etc…

• Alignment tested and verified.

Pre-Operation Flexible Perforating system test

3D modelling data sets from S-shaped collapses

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Thermal process of polymer shaping to recreate axial

displacement measured downhole.

• Transparent matrix material to facilitate understanding

Gunstring behaviour.

• Identical Internal Diameter as tubular target
• Flanged short tubular section to create an interchangeable

interlocking set up.

Pre-Operation Flexible Perforating system test

3D modelling a data set from a C-shaped collapse

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Background
• Tubular Axial Displacement
• Flexible Perforating system design
• Pre-Operation Flexible Perforating system test
• Conclusion

Pre-Operation Flexible Perforating system test

Single Shot Mono Carrier through C-shape displacement

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Insert VIDEO

Pre-Operation Flexible Perforating system test

Single Shot Mono Carrier through S-shape displacement

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Insert VIDEO

Pre-Operation Flexible Perforating system test

Single Shot Dual Carrier through C-shape displacement

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Insert VIDEO

Flexible Perforating system selection

Gunstring selection for Wireline and electrical Carbon Rod/Coiled Tubing

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Primary factor : Flexi-Point to Flexi-Point distance
• Secondary factor : Maximum Gun String OD
• Wireline conveyed : 60% of Total Gunstring weight should

be located on the lower part of it.

• Carbon Rod conveyed : uniform spread of articulated

points to avoid «push and lock» situation

• Depending on conveyance review Knuckle Joint design

Conclusion

Maximizing success rate of re-perforation beneath axial displacement

2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

• Collecting Well Completion, Geological and field history

information

• Identifying through study or pre-perforation investigation

runs the type and shape of the deformed area

• Reducing Maximum Flexi-Point to Flexi-Point distance
• Reducing Gunstring OD
• Recommended use of Addressable firing system
• For Electrical Wire conveyance the gunstring should be

“bottom heavy”

• For Carbon Rod/Coiled Tubing conveyance, Rollers and

articulated subsystem should be spreading along the gunstring to avoid both early buckling and “push and lock”

• Pre-Operation system test and review of Gunstring

movement and behaviour

2019-NAPS-6.4

AUTHORS: Max Maouche, Archer. DALLAS - FORT WORTH. AUGUST 5-6, 2019.

QUESTIONS? THANK YOU