Thien Nam Offshore Services

What Thien Nam Offshore Services does

Thien Nam Offshore Services Joint Stock Company (TOS), headquartered in Vung Tau, Vietnam, is a privately-held offshore and subsea services contractor established in 2008. The company delivers inspection, maintenance and repair (IMR), subsea construction, transportation and installation (T&I), pipeline and cable laying, and plug and abandonment (P&A) services to oil and gas operators and EPC contractors across Vietnam and the broader Southeast Asia region. Its primary customer base consists of national oil companies, joint operating companies, and international operators active offshore Vietnam and in the Gulf of Thailand, including PVEP POC, Cuu Long JOC (CLJOC), Petrovietnam Gas (PV GAS), Binh Son Refining (BSR), Bien Dong Petroleum Operating Company (BDPOC), and PTT PLC Thailand. TOS has completed more than 200 offshore projects since founding and supports the Renewable industry as a stated secondary vertical.

TOS executes its service contracts using a proprietary equipment fleet, anchored by the PLB TOS Ha Long pipelay barge equipped with a 300-ton crane for heavy-lift and pipelay operations. The company's ROV spread includes SMD work-class Quantum 3 and Quantum 4 vehicles and the Seaeye Lynx observation ROV certified for Zone II hazardous area operations and water depths up to 300m. Specialized intervention assets include a Modular Saturation Diving System, an Air Diving Spread, a 320T Rigless Abandonment System for rigless well abandonment and tubular extraction, a T1000 Stev-tensioner for pipeline and umbilical laying, plus Grouting Spread, Mass Flow Equipment, and Heavy Well Operations (HWO) spreads. Featured project references include a 30.5 km 26-inch concrete-coated pipeline beach-pull and lay campaign for PV GAS (2020-2021), FPU DH01 disconnection-towing-reinstallation at Dai Hung Field (2020), CALM buoy turnaround work at Dung Quat SPM for BSR (2020), and TBVN FPSO upper mooring chain replacement for CLJOC (2021).

TOS generates revenue through project-based lump-sum and unit-rate contracts priced on scope, equipment, vessel, and duration; pricing is not publicly disclosed. The company combines direct end-customer engagement with subcontract or T&I roles to EPC contractors such as VietsovPetro (selected as T&I subcontractor on the Dai Hung Phase 3 Field Development Project, contract signing 2022-11-23, execution 2023-2024) and equipment hire arrangements with regional contractors such as SapuraKencana TL Offshore. Two wholly-owned operating subsidiaries - Thien Nam Subsea JSC (ISO 9001-2008 certified diving services) and Thien Nam Construction JSC (fabrication) - extend internal service depth. Headcount is listed at 11-50, reflecting a lean core team supplemented by project-based marine and diving personnel.

Name

Thien Nam Offshore Services

Legal name

Thien Nam Offshore Services Joint Stock Company

Website

https://thiennamoffshore.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

11–50 employees

Short description

Thien Nam Offshore Services JSC (TOS) is a Vietnam-based offshore contractor providing subsea inspection, maintenance, repair, pipeline laying, transportation and installation, and plug and abandonment services to oil and gas operators.

Ownership category

akta.pro rank

Product category

Offshore Oil & Gas Subsea Services

NAICS

Support Activities for Water Transportation (4883), Other Support Activities for Water Transportation (48839)

SIC

Oil & Gas Field Services, Nec (1389), Oil & Gas Field Machinery & Equipment (3533)

akta.pro primary industry

Marine & Offshore Energy O&M (Offshore Wind, Platforms, Subsea Assets) (EUAEAGAO)

akta.pro secondary industries

Underwater Inspection, Maintenance & Repair (UWILD, Diving/ROV, In-water Cleaning) (IMAJAFAJ), Pipe-lay & Heavy-lift Offshore Vessel Construction (IMAJACAE), Offshore Marine & Aviation Support (PSVs, AHTS, Crew Boats, Helicopters) (EUALABAJ)

Keywords

• Offshore subsea services
• Oil gas inspection
• Subsea construction
• Plug and abandonment
• Pipeline installation

Headquarters

HQ city

Vung Tau

HQ country

Vietnam

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Operations, Personnel, Infrastructure, Supply Chain, Technology or R&D, Marketing or Sales

Revenue model

1. Offshore Services Contracts: TOS generates revenue through lump-sum or unit-price contracts with oil & gas operators for offshore inspection, maintenance, repair, subsea construction, transportation & installation, and plug & abandonment services. Revenue is project-based, highly episodic, and tied to the capital expenditure cycles of oil & gas companies. Major clients include PVEP POC, CLJOC, PTT PLC Thailand, PetroVietnam Gas, and Binh Son Refining.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Thien Nam Offshore Services JSC provides offshore and subsea services to the oil & gas and renewable industries, including inspection, maintenance and repair (IMR), subsea construction, transportation & installation (T&I), pipeline and submarine cable laying, well plugging & abandonment (P&A), FPSO/FPU/SPM mooring system maintenance, and onshore fabrication. Services are executed using a proprietary fleet of assets including the PLB TOS Ha Long pipelay barge, work-class and observation ROVs, a 320T rigless abandonment system, and modular saturation and air diving spreads.

Product overview

Thien Nam Offshore Services JSC (TOS) is an offshore energy services company offering a comprehensive suite of marine and subsea services to the oil and gas industry. The company operates a fleet of specialized vessels and equipment including the PLB "TOS Ha Long" pipelay barge with 300T crane, a ROV spread (Quantum 3, Quantum 4, and Seaeye Lynx), Modular Saturation Diving System, 320T Rigless Abandonment System, Air Diving Spread, Flexible/Cable Laying Spread, Grouting Spread, Mass Flow Equipment, T1000 Stev-tensioner, and HWO Equipment. Core services encompass offshore construction, offshore subsea survey, onshore fabrication, operation and maintenance, plug & abandonment, transportation & installation (T&I), and offshore survey & maintenance. The company also operates two subsidiaries: Thien Nam Subsea (diving services) and Thien Nam Construction (fabrication services), managed under ISO 9001-2008 quality standards.

Differentiator

Problem solved

Functional benefit

Products and services

• Offshore Subsea Survey Services

Quantifiable outcome

• 200+ projects completed successfully across Vietnam and S.E.A. region
• +1 more outcomes

Named customers8 records

Segments1 record

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Five partnerships are on record, tiered core and minor.

• VietsovPetrocoreStrategic or Co-development Partner · 23 November 2022VietsovPetro acts as the EpCI Contractor for the Dai Hung Phase 3 Field Development Project, with PVEP POC as the Owner. TOS was honored to serve as the T&I (Transportation & Installation) subcontractor for this major project, performing installation work of rigid & flexible pipeline, submarine cable, tie-in, and pre-commissioning for the entire pipeline system, scheduled for execution in 2023-2024. This is a significant project win that positions TOS as a key subsea T&I service provider in the Dai Hung field.
• PTSC (PetroVietnam Transportation and Subsea Services)coreStrategic or Co-development PartnerPTSC is a major Vietnamese oilfield services company. TOS collaborated with PTSC POS on the Inspection and Replacement of FPU DH01 & CALM BUOY's anchors and chain cables project (2015). TOS has also used PTSC vessels such as PTSC Offshore 01, PTSC Ngan Nam, and PTSC Thai Binh across multiple projects.
• SapuraKencana TL Offshore (SKTLO)minorChannel Partner/ Reseller/ DistributorSKTLO hired TOS's tensioner system (T1000 Stev-tensioner) and operational personnel for laying umbilical for BK4A (Bach Ho field) and Thien Ung platform (Dai Hung field) projects. This represents a rental/equipment services relationship where TOS's equipment was deployed under SKTLO's project scope.
• Thien Nam Subsea Joint Stock CompanycoreStrategic or Co-development PartnerA subsidiary of Thien Nam Offshore Services JSC specializing in diving services in Vietnam. Thien Nam Subsea provides a team of well-trained divers with extensive experience and modern diving equipment meeting international standards, managed under ISO 9001-2008 quality management system. This affiliated entity provides specialized saturation and air diving capabilities that complement TOS's core subsea services.
• Thien Nam Construction Joint Stock CompanycoreStrategic or Co-development PartnerA subsidiary of Thien Nam Offshore Services JSC providing onshore and offshore construction and fabrication services. The company has successfully and safely executed major support system construction and fabrication works for the shore/offshore facilities in the Oil and Gas industry. Their construction and fabrication services have been highly appreciated by clients.

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• TechnipFMC: Global subsea engineering, construction, and services company with deepwater pipelay, subsea tree installation, and IMR capabilities. Comparable in pipelay and subsea construction scope but at vastly greater scale and integrated engineering capability.
• China Oilfield Services Limited (COSL): China's largest integrated offshore oilfield services company offering drilling, geophysical, subsea construction, and vessel services globally. Provides overlapping subsea capabilities (ROVs, diving, T&I) at far greater scale; would compete with TOS on larger cross-border tenders in the region.
• DOF Subsea: Global subsea services company with IMR, ROV, diving, and subsea construction vessel operations. Comparable subsea IMR and construction service lines, but operating at global scale with a much larger vessel and ROV fleet than TOS.

Direct peers

• Mermaid Maritime: Thailand-based subsea and offshore services company providing ROV, diving, and subsea construction across Southeast Asia. Comparable geographic focus (Thailand/Vietnam offshore basins), service portfolio (subsea IMR and construction), and customer base overlap (PTT and regional NOCs).
• Vallianz Holdings: Singapore-based offshore support vessel and subsea services provider serving oil & gas operators across the Middle East and Southeast Asia. Comparable in offshore vessel-based service delivery and regional SEA customer focus, though Vallianz is more vessel-platform-heavy than equipment-spread-heavy.
• PTSC (PetroVietnam Technical Services Corporation): Vietnam's largest state-owned offshore services company, providing subsea construction, pipelay, ROV, diving, and offshore vessel services to Vietnamese and regional oil & gas operators. Directly comparable as TOS has partnered with PTSC on multiple projects (e.g., PTSC Offshore 01 vessel use) and competes for the same Vietnamese O&G tenders.
• Sapura Energy (formerly SapuraKencana): Malaysian integrated offshore services and energy company with subsea construction, pipelay, diving, and ROV capabilities serving Southeast Asian operators. Comparable in service scope (subsea IMR, T&I, umbilical/pipeline laying) and has directly engaged TOS as a tensioner equipment and personnel provider on prior projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks7 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/thien-nam

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Thien Nam Offshore Services