Company lists · Data refreshed October 2026

Top 25 Refinery upgrade contractors based in Nigeria

Name: Refinery upgrade contractors based in Nigeria
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 22, 2026 256 companies tracked

RevenueBase identified 256 company matches for refinery upgrade contractors associated with Nigeria as of October 2026 and tracks 4,057 professional contacts across them, including 595 with verified work emails. Port Harcourt is the largest hub.

This list covers company matches for refinery upgrade contractors associated with Nigeria, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 22, 2026 How this list was built

256Companies

4,057Contacts tracked

595Verified emails

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The 25 largest refinery upgrade contractors based in Nigeria

Ranked by team size

Top 25 of 256 company matches for refinery upgrade contractors based in Nigeria, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 22, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Dover Engineering Limited	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	501-1,000	312 contacts →
	Exact match “Dover Engineering Limited is a reputable Engineering Design,EPC, Operations & Maintenance Company.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
2	Ariosh	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	201-500	252 contacts →
	Exact match “Ariosh delivers engineering and construction services in the onshore, offshore and subsea segment of the oil and gas sector in Nigeria, West Africa.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
3	Pivot-Gis Limited	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	201-500	251 contacts →
	Exact match “PIVOT-GIS is a leading Nigerian Engineering, Procurement, Construction, Operations & Maintenance (EPCOM) company serving the oil, gas, and energy sectors since 2004.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
4	Makon Group	Exact match	Lekki, NigeriaHQ recorded Oct 22, 2026	501-1,000	194 contacts →
	Exact match “Makon Group is an international organisation with its business interests spanning Engineering, Procurement, Construction, Operation and Maintenance (EPICOM) for Oil and Gas…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
5	Ponticelli Nigeria	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	501-1,000	165 contacts →
	Exact match “PONTICELLI NIGERIA [PNL] is a subsidiary of PONTICELLI Frères Group, a leading European services supplier to companies in the energy, industrial, and infrastructural sectors.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
6	Kohasa Engineering Company Limited	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	11-50	128 contacts →
	Exact match “Kohasa Engineering Company Limited is an oil and energy company based out of Plot 474, Trans Amadi industrial layout, Port Harcourt, RIVERS, Nigeria.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
7	LEE Engineering And Construction Company LTD	Exact match	Ikoyi, NigeriaHQ recorded Oct 22, 2026	501-1,000	117 contacts →
	Exact match “Lee Engineering and Construction Co.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
8	DBN Energies	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	201-500	106 contacts →
	Exact match “DBN’s core competencies include a vast range of engineering and construction capabilities that cater to the diverse needs of its projects and clients in Nigeria and globally.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
9	Hydroserve Group	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	51-200	93 contacts →
	Exact match “Hydroserve Group is a leading oil and gas company which started as Hydroserve Oil Services Nigeria Limited in November, We began operations in with Pipeline & Process, and Pumping…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
10	Rosetti Pivot LTD	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	51-200	90 contacts →
	Exact match “Rosetti Pivot Limited provides an array of engineering, procurement, and construction services to the oil & gas sectors within Nigeria and the Sub-Saharan Africa region, using…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
11	Elper Oilfield Engineering	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	501-1,000	72 contacts →
	Exact match “ELPER has built in time, a strong international network, and a specialized engineering company, providing services ranging from Engineering Procurement & Construction to Marine…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
12	Crestech Engineering Limited, Lagos - Nigeria	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	51-200	67 contacts →
	Exact match “Crestech is an Engineering Design and Project Management Company with its head office in Victoria Island, Lagos, Nigeria.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
13	Frazimex Engineering Limited	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	201-500	58 contacts →
	Exact match “FRAZIMEX ENGINEERING LIMITED, a member of Oilserv group was incorporated in 2005 under the laws of the Federal republic of Nigeria as a private limited liability company that…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
14	Weltek Limited	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	11-50	53 contacts →
	Exact match “Weltek Limited is a Nigerian engineering and energy-services company established in 1986.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
15	Bridgsite Nigeria Limited BNL	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	201-500	52 contacts →
	Exact match “BRIDGSITE NIGERIA LIMITED (BNL) is an indigenous Engineering and Construction Services Company engaged in the provision of solution oriented, cost effective and responsive high…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
16	Deltatek Offshore Limited	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	201-500	47 contacts →
	Exact match “DeltaTek Offshore Ltd is a leading Engineering, Procurement, Installation, Construction, and Commissioning (EPICC) service provider in the oil and gas sector of Sub-Sahara Africa.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
17	Hallmark Global Petroleum Limited	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	11-50	37 contacts →
	Exact match “Summary ABOUT US: Hallmark Global Petroleum Ltd (HGP) was incorporated in 2002 as a 100% Nigerian owned and operated oil and gas Services Company.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
18	Emobella Engineering Nigeria Limited	Exact match	Ikeja, NigeriaHQ recorded Oct 22, 2026	11-50	32 contacts →
	Exact match “Emobella Engineering Nigeria Limited is an indigenous engineering support service company incorporated in 2015 under the laws of the Federal Republic of Nigeria, A registered…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
19	Debyl Limited	Exact match	Port Harcourt, NigeriaHQ recorded Oct 22, 2026	11-50	32 contacts →
	Exact match “DEBYL LIMITED is an indigenous company.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
20	Geoscape Limited	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	11-50	28 contacts →
	Exact match “Geoscape Limited is a certified Oil and gas engineering services company in Nigeria with many years of experience and knowledge of international standards, technological and…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
21	Gmunu Limited	Exact match	Lekki Phase 1, NigeriaHQ recorded Oct 22, 2026	51-200	26 contacts →
	Exact match “GMUNU is a full-service Engineering Procurement and Construction Company.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
22	Quest OIL And Engineering Services Limited	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	11-50	23 contacts →
	Exact match “Quest Oil and Engineering Services Limited is a value-driven company offering full-service in oil and gas, as well as engineering service.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
23	Habrams Energy Services	Exact match	Lagos, NigeriaHQ recorded Oct 22, 2026	201-500	23 contacts →
	Exact match “Habrams Energy offers specialist engineering, procurement, construction & project management, operations, and maintenance services for your oil & gas projects in the Gulf of…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
24	Supasteel Limited	Exact match	Kaduna, NigeriaHQ recorded Oct 22, 2026	201-500	22 contacts →
	Exact match “Supasteel Limited is a wholly indigenously owned Engineering Procurement and construction Company carrying out Fabrication, Installation, Repair of Static and Rotating Equipment…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
25	Bicens Resources Limited	Exact match	Warri, NigeriaHQ recorded Oct 22, 2026	501-1,000	19 contacts →
	Exact match “Bicens Resources Limited is a tech savvy multidisciplinary firm with competencies in the Oil & Gas Industry, Providing and delivering exceptional solutions in DRILLING,OPERATIONS…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “refinery upgrade contractors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 256 refinery upgrade contractors based in Nigeria

See the full list, filter by size, metro and specialty, and access 595 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Refinery upgrade contractors based in Nigeria at a glance

As of Oct 22, 2026

14.7%Verified-email coverage

15.8Average contacts per company

11-50Median size (employees)

28.5%Largest-city concentration · Port Harcourt

Oct 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

122

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for Nigeria, so it is reported there. Company counts and contact totals on this page are exact for Nigeria, over 256 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Nigeria whose business descriptions match “refinery upgrade contractors” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 595 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on October 22, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Refinery upgrade contractors by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “refinery upgrade contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many refinery upgrade contractors are there based in Nigeria?

RevenueBase identified 256 company matches for refinery upgrade contractors associated with Nigeria as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Dover Engineering Limited tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most refinery upgrade contractors?

Port Harcourt leads with 73 company records, followed by Lagos (54) and Lagos State (20).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 595 professional contacts with verified work emails tracked across these 256 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 22, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.