Vaalco Energy's successful Gabon gas well targets lower costs as drilling continues

Vaalco Energy Inc has successfully drilled, completed and brought its ETBNM-3 gas-supply well into production offshore Gabon.

The result matters because the well should provide enough gas for field operations, oil liftings and power requirements. This is expected to reduce Vaalco's reliance on more expensive diesel, although the company has not disclosed the expected financial saving.

The drilling rig has already moved to its next location, where Vaalco plans to test additional reservoir potential before drilling a 300-metre horizontal oil development section.

This is a positive operational update, but investors should keep the benefits in perspective. The gas well will not directly add production or sales, and no immediate earnings or cash flow uplift has been quantified.

Key details from Vaalco's operational update

Item	Detail
Company	Vaalco Energy Inc
Asset location	Offshore Gabon
Completed well	ETBNM-3
Primary reservoir	Dentale D-15
Net reservoir pay	More than 10 metres
Main benefit	Gas supply for operations, liftings and power
Expected cost effect	Reduced use of higher-priced diesel
Next well	ETSEM-3PH
Rig moved	27 July 2026
Planned horizontal completion	300 metres within the Gamba sands

The full details are available in the original company announcement.

ETBNM-3 delivered a better-than-expected reservoir result

Vaalco drilled ETBNM-3 in the crestal portion of the North Tchibala structure. The well targeted the Dentale D-15 reservoir and has now been placed into production as a gas-supply well.

According to the company, reservoir properties came in above its pre-drill estimates. The well encountered more than 10 metres of net reservoir pay, with strong porosity and permeability.

Net pay refers to the portion of the reservoir considered capable of producing hydrocarbons. Porosity measures the space available within the rock to hold oil or gas, while permeability indicates how easily those hydrocarbons can flow through it.

Better-than-expected reservoir quality is encouraging because it supports the well's ability to supply the field's operational gas requirements. However, Vaalco did not disclose a production rate for ETBNM-3.

Why replacing diesel matters

ETBNM-3 is not designed to contribute directly to Vaalco's reported oil and gas sales. Instead, its value lies in supporting field operations.

Vaalco said the well provides sufficient gas for operations, liftings and power needs, significantly reducing the cost of using higher-priced diesel. Chief executive George Maxwell added that the well should improve field uptime and could potentially deliver a production uplift from existing wells over time.

The distinction is important. This is primarily a cost and operational reliability development rather than a new source of direct revenue.

Using locally produced gas instead of diesel could lower field operating costs and reduce exposure to diesel pricing and supply requirements. Better uptime could also help Vaalco get more consistent performance from existing infrastructure and producing wells.

Still, the announcement does not quantify the amount of diesel being replaced, the annual cost saving or the potential production uplift. Investors will need future operating and financial results to judge how material the benefit becomes.

Shallower intervals offer additional potential

The well also encountered shallower pay intervals in the Dentale D-9 and D-12 zones. Vaalco said these appear to contain wet gas to light oil pay.

Wet gas contains liquid hydrocarbons alongside natural gas, while light oil is a relatively low-density crude oil. Either could offer additional value if further evaluation supports commercial development.

For now, that potential remains under assessment. Vaalco has not disclosed estimated resources, expected flow rates, development costs or a timetable for a decision. Investors should therefore treat the D-9 and D-12 intervals as possible upside rather than established value.

The drilling campaign has moved to SE Etame

Vaalco moved the drilling rig on 27 July to a new slot on the SEENT platform. The company has commenced the ETSEM-3PH pilot hole and development well at SE Etame.

The pilot hole is designed to gather reservoir information before the main development section is drilled. It will test the field's original oil-water contact, meaning the depth at which oil-bearing rock transitions into water-bearing rock. It will also assess the potential of the underlying Dentale formation.

Following the pilot, Vaalco plans to drill a horizontal Gamba producer near the crest of SE Etame's central fault block. The planned completion will extend for 300 metres through the Gamba sands.

Horizontal wells can expose a longer section of productive reservoir than a conventional vertical well, potentially supporting stronger production. However, Vaalco has not disclosed a production target, drilling budget or expected date for first oil from ETSEM-3PH.

What looks positive for shareholders?

There are three main positives in the update:

1. ETBNM-3 has been successfully delivered. The well has moved beyond drilling and completion and is now supplying gas.
2. Reservoir quality exceeded expectations. Strong porosity, permeability and more than 10 metres of net pay support the operational purpose of the well.
3. The rig is already working on the next target. This shows continuity in the Gabon drilling programme rather than a pause between wells.

The cost-saving angle is particularly relevant. A well does not need to add direct sales to create value if it reduces operating expenditure or improves the reliability of existing production.

Vaalco's earlier operating and financial performance can be explored in its Q3 2025 results and operational highlights.

What are the main risks?

The most obvious limitation is the lack of quantified financial impact. Vaalco describes a significant reduction in diesel costs, but the expected saving is not disclosed.

Likewise, the suggested improvement in field uptime and possible uplift from existing wells are forward-looking expectations. Actual benefits could differ depending on field performance and how reliably the new gas-supply system operates.

The next well also carries normal drilling and execution risks. The pilot may produce less favourable reservoir information than expected, while the horizontal development section may not deliver the production performance sought.

More broadly, Vaalco remains exposed to oil and gas prices. Operational savings can help margins, but commodity prices will continue to influence revenue and cash generation.

The next data points to watch

The ETBNM-3 result strengthens Vaalco's Gabon operations by replacing higher-cost diesel with field gas. That is useful progress, even though it does not directly increase sales.

Attention now turns to ETSEM-3PH. Investors should watch for the pilot-hole results, findings from the Dentale formation, successful completion of the 300-metre Gamba section and any disclosed production rate.

Future reporting may also clarify the scale of diesel savings and whether improved field uptime produces a measurable uplift from existing wells. Those figures will determine whether this successful operational result develops into a material financial benefit.