Integrated Services
Geotechnical Surveying
Subsea Engineering
Casing & Tubing Running
Pipe Inspection & Repair
Directional Drilling
Drilling & Completion Fluid
Environmental Protection Services
Production and Optimization
Well Completion
Liftboats & Accommodation Rigs
Marine Support Vessels
Manufactures & Products
Unconventional Operations
Business Contact
Subsea Engineering

COSL owns a DP II engineering support vessel, ROVs, seabed cable and pipeline tracking devices, pipeline inner detectors and other associated equipments to provide customers with integrated services, which include program engineering design, site operation, data acquisition, engineering analysis, and engineering reports. COSL’s new deepwater investigation vessels, HYSY701 and HYSY702 can operate at water depth to 3000 meters and in a myriad of applications: wellhead maintenance, well completion, workover, well interventions, well abandonments, routing surveys, and ROV and SAT diving support, and moreover, IMR (inspection, maintenance, and repair) and A-frame stern outboard operations.

The main services include::

  • routine underwater operations; ROV operations; pipeline and cable as-built route survey and ditching; pipeline internal and external inspections; abnormal damage detection and repair; offshore structure inspection and repair; safety evaluations; mooring system analyses and replacement ; casing design and repair
  • X-tree installation, maintenance, and flow line tying-in
  • riser-less workover or light intervention
  • other subsea engineering support