Upstream Operations
Wellhead Maintenance Services
Comprehensive inspection, repair, and maintenance of all wellhead components and Christmas tree assemblies — ensuring safe, reliable production with zero downtime.
Service Overview
Expert Wellhead Maintenance
Sequential International provides end-to-end wellhead maintenance services for producing and idle wells across the Niger Delta. Our trained engineers perform routine inspections, preventive maintenance, and corrective repairs on all major wellhead OEM equipment.
From surface wellhead components to Christmas tree valve operations, we ensure your production equipment remains in optimal condition — minimising unplanned shutdowns and maximising asset life.
“No wellhead challenge is too complex — our team brings the right tools, certifications, and expertise to every job.”
What We Deliver
Scope of Work
Wellhead Inspection
Detailed visual and instrumented inspection of all wellhead components including tubing heads, casing heads, and flowlines for corrosion, wear, and leaks.
Christmas Tree Overhaul
Full disassembly, cleaning, seal replacement, function testing, and reinstallation of Christmas tree assemblies to OEM specifications.
Annulus Leak Repair
Rigless wellhead annulus communication and leak detection with permanent sealing using proprietary chemical and mechanical methods.
Valve Maintenance
Gate valve, check valve, and choke maintenance including grinding, lapping, and replacement of valve internals and packing.
Torque & Test
Controlled make-up torque of all connections with full pressure testing to API and client specifications post every intervention.
Preventive Programs
Development and execution of scheduled preventive maintenance programs to extend well life and reduce emergency interventions.
How We Work
Our Service Process
Site Assessment
HIRA review, permit to work issuance, and detailed equipment condition baseline documentation.
Mobilisation
Deployment of specialist crew and OEM-approved tooling to site within agreed timelines.
Execution
Controlled maintenance activities under live HSE monitoring with daily toolbox talks.
Testing & Handover
Full pressure testing, documentation, and sign-off with as-found vs as-left reporting.
Why Choose Us
Key Benefits
Reduced Unplanned Downtime
Proactive maintenance programmes prevent unexpected production losses.
Extended Asset Life
Regular maintenance significantly extends the operational life of wellhead equipment.
OEM-Level Competence
Our engineers are trained on major OEM wellhead brands and specifications.
DPR / NUPRC Compliant
All work carried out in full compliance with Nigerian upstream regulatory requirements.
Full Documentation
Comprehensive as-found, as-left reports and well data delivered post every job.
Rapid Mobilisation
Pre-positioned crews and tooling allow us to respond within 24–48 hours.
All wellhead maintenance activities are executed under a formal Permit to Work system with isolation verification, pressure bleed-off confirmation, and full crew HSE briefings. Our zero-tolerance safety policy applies on every job.
Capabilities
Equipment & Capabilities
Wellhead OEM Tooling
Approved tools for major wellhead OEM brands including Cameron, Vetco, FMC, and WECO.
Pressure Test Units
High-pressure test pumps rated to 15,000 psi for post-maintenance integrity verification.
NDT Equipment
Ultrasonic thickness gauges, magnetic particle, and dye penetrant kits for component inspection.
Seal & Gasket Stock
On-site inventory of API-spec seals, O-rings, and ring gaskets for common wellhead configurations.
Valve Grinding Kits
Lapping and grinding equipment for on-site reconditioning of gate valves and choke seats.
Replacement Parts
Fast-access inventory of common wear parts and replacement components for immediate deployment.
Ready to Schedule Your Wellhead Maintenance?
Contact our team today for a site assessment or preventive maintenance proposal. We service wells across the Niger Delta and beyond.