Eagle Ford Basin
An operator sought to refracture a well and traditional inspection methods returned inconclusive results of the well’s condition. This ambiguity meant the operator must choose to either run a frac string, increasing frac costs, or risk the parent casing. Instead the operator turned to DarkVision to perform a thorough well integrity investigation and burst pressure analysis to assess refracturing the well without a frac string.
DarkVision’s HADES-T® high-resolution acoustic imaging system scanned all 290+ joints in a single pass and inspected the casing for ID and OD defects. Based on the detailed report from DarkVision, the operator evaluated every defect and the maximum safe re-frac pressure and determined a re-frac string was not needed. With confidence in the integrity of the well, the operator executed a successful re-frac campaign without a frac string. Casing failure was avoided, and significant time and costs were saved during refracturing.
- 16871.5 ft
- Nominal OD
- 5.5 in
- Nominal Thickness
- 0.361 in
- Max Penetration
- 0.22 in
Burst Pressure Over Joint
- Effective Area
- 11954.5 psi
- Modified B31G
- 7813.0 psi
- 5716.4 psi
Results Are In The Details
The operator was able de-risk the re-frac operation and safely operate 6,000psi higher across this joint without compromising the integrity of the well. This was achieved by using a detailed Effective Area burst pressure calculation over Modified B31G and Barlow methods. Effective Area burst pressure calculations are an advanced analysis method that traditionally has been out of reach for downhole operators due to legacy tools providing insufficient coverage, resolution, and accuracy in remaining wall thickness measurements.
Burst Pressure Methodologies
Shown are different methods to calculate Burst Pressure from the ASME B31G standard. Figures are Riverbottom profiles that project greatest metal loss circumferentially over axial length. Barlow and Modified B31G methods are older methods that provide approximations when only low resolution wall thickness measurements are available.
The sub-millimetric resolution delivered by HADES-T enables more accurate Effective Area and RSTRENG evaluation methodologies that better account for complex geometries but require high resolution wall thickness measurements. DarkVision’s 3D thickness scans are ideal for creating detailed profiles of defects and unlocking the use of advanced burst pressure calculations. This is enabling operators to safely determine higher allowable pressures and further optimize wells during completions.
Deep Into The Details
Our latest whitepaper goes into further detail.
Learn how to de-risking well operations by getting detailed sub-millimetric wall thickness profiles in the field to perform advanced burst pressure analyses.
SPE-210010-MS: High-Resolution Acoustic Imaging for Submillimetric Casing Thickness Quantification and Advanced Effective-Area-Based Burst Pressure Analyses
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