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

Re‐perforating formerly inaccessible well areas beneath completion collapse and axially DALLAS - FORT WORTH. AUGUST 5-6, 2019. displaced tubulars: Gunstring design & selection 2019-NAPS-6.4 AUTHORS: Max Maouche, Archer.

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

Background Subsidence and Geoformation impact on downhole 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 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

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

Flexible Perforating system design Selected Single and Multishot Perforating solutions  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. 2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Pre-Operation Flexible Perforating system test 3D modelling data sets from S-shaped collapses  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. 2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Pre-Operation Flexible Perforating system test 3D modelling a data set from a C-shaped collapse  Background  Tubular Axial Displacement  Flexible Perforating system design  Pre-Operation Flexible Perforating system test  Conclusion 2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Pre-Operation Flexible Perforating system test Single Shot Mono Carrier through C-shape displacement  Insert VIDEO 2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Pre-Operation Flexible Perforating system test Single Shot Mono Carrier through S-shape displacement  Insert VIDEO 2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Pre-Operation Flexible Perforating system test Single Shot Dual Carrier through C-shape displacement  Insert VIDEO 2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Flexible Perforating system selection Gunstring selection for Wireline and electrical Carbon Rod/Coiled Tubing  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 2019-NAPS-6.4 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

Conclusion Maximizing success rate of re-perforation beneath axial displacement  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 Re‐perforating formerly inaccessible well areas beneath completion collapse and axially displaced tubulars

QUESTIONS? DALLAS - FORT WORTH. AUGUST 5-6, 2019. THANK YOU 2019-NAPS-6.4 AUTHORS: Max Maouche, Archer.