Subsea and Pipeline Inspection and Survey Works - Chevron Australia Operations

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Chevron Australia is seeking expressions of interest from service providers able to provide subsea and pipeline inspection and survey works in support of Chevron ABU assets.

Contractor shall provide a comprehensive inspection campaign of the subsea structures and pipelines in the Gorgon, Jansz–Io, and Wheatstone fields, scheduled for 2027.

• Total pipeline and umbilical length: 1,448 km (including 8 third-party crossings, 3.2 km).

• Assets covered: infield/export pipelines, umbilicals, subsea trees, manifolds, jumpers, stabilization/protection features.

Scope of work includes (but not limited to):

Methodologies

• General Visual Inspection (GVI): ROV/AUV-based, high-definition video for anomaly detection.

• Cathodic Protection (CP): Contact and field gradient measurements for corrosion protection assessment.

• Freespan & Embedment Measurement: Multi-beam echo sounder for pipeline positioning and fatigue analysis.

• Bathymetry & Inclination: asset-specific survey techniques.

• Management Systems

• Data delivered via Azure.

• Asset performance managed in Integrity Elementz.

• Geospatial data managed in Esri ArcGIS SSIM.

Scope Requirements

• In Scope: All Gorgon, Jansz, Wheatstone, Julimar and Brunello infield/export pipelines, crossings, umbilicals (min depth -25m); structure inspection (trees, manifolds, jumpers, spools, PTSs, PLETs, CDUs, SUTAs); CP measurement; inclination at Wheatstone PLETs.

• Out of Scope: Wheatstone platform SGS, risers, SSIVs, DC2 assets; Jansz Io Compression assets; Gorgon Stage 3-5 assets; DomGas pipeline/riser; pipelines < -25m; flying leads (except Julimar/Brunello); subsea batteries; freespan analysis.

Asset Details

• Gorgon Infield: 16 lines, 132 km, water depth 130–250m, 18 crossings; detailed survey limits, OD, freespan, structure height, crossing data.

• Gorgon Export: 5 lines, 259 km, water depth 25–130m, 23 crossings; detailed survey limits, OD, freespan, structure height, crossing data.

• Jansz Infield: 12 lines, 65 km, water depth 1,307–1,350m, 15 crossings; survey limits, OD, freespan, structure height, crossing data.

• Jansz Export: 4 lines, 522 km, water depth 25–1,344m, 25 crossings; survey limits, OD, freespan, structure height, crossing data.

• Wheatstone Infield North & South (includes Julimar & Brunello ): 17 lines, 131 km, water depth 130–250m, 18 crossings; utility, production, MEG, umbilical pipelines.

Survey & Inspection Requirements

• Detailed tables for each asset: kilometre points (KP), outside diameters (OD), freespan limits, structure heights, crossing details.

• Inspection durations: Structure inspection ≤21 days (18 routine + 3 anomaly re-inspection); Gorgon: 6.25 days, Jansz: 3.74 days; assetspecific durations for trees, jumpers, manifolds, spools, PTS, PLET, PSP, BKI, CDU.

Deliverables

• Bathymetry (XYZ, SSDM), infrastructure (SSIM), images/video (timestamped), CP/field gradient data, QA/QC summary, MDDR, ISO 8601 timestamp (UTC/AWST).

• Data formats: Excel/CSV preferred, SQLite for integrity; QA/QC mandatory; non-compliance may require rework.

Contractor Proposal Requirements

• Procedures for vessel ops, calibration, data collection/processing, QA/QC.

• Technical methodology (equipment, sensors), project management, schedule, personnel/experience, data processing/reporting, compliance (IMCA, DNV, MSRE).

Safety & Compliance

• Strict offshore safety, no subsea human risk, safety/environmental plan required (hazards, hydrocarbon spill prevention).

References: Chevron standards (CES SSM-SU-5419, FFS-PU-6151, CPMPU-5222), pipeline/umbilical run lines, structure levelling procedures, risk assessments