Antelopus shifts Duarmara focus to oil as Assam gas grid lags

Antelopus is prioritising assessment of an unexpected oil-bearing TIPAM-1 zone at Duarmara because oil can be trucked to refiners, unlike Assam gas, whose sales are constrained by incomplete National Grid connectivity. Management said oil had been circulated from Duarmara-4Z twice and estimated future wells could cost about Rs 60 crore to Rs 70 crore each.

Why is Antelopus focusing on oil at Duarmara?

Antelopus is focusing on the TIPAM-1 oil zone because it avoids the gas-evacuation constraint affecting Assam. The Duarmara-4Z well was drilled to assess three reservoirs, TIPAM-1, TIPAM-2 and TIPAM-3, with TIPAM-2 and TIPAM-3 regarded as gas-bearing targets. Instead, management said it found oil in TIPAM-1, an outcome not included in its original plans.

The practical difference is transport. Antelopus said oil can be loaded into trucks and hauled about 300 kilometres to a refiner, following a model it already uses in the Cambay Basin. Gas requires treatment, compression and pipeline evacuation, while oil infrastructure is simpler to construct, according to management. If oil is established, management said the period from sustainable surface flow to sales could be months rather than a longer infrastructure buildout.

What has Antelopus found in the Duarmara-4Z well?

Antelopus has reported oil indications twice through wellbore circulation, but has not disclosed a flow rate, resource estimate or development decision. Management said it circulated oil out of Duarmara-4Z on two occasions and described the crude as light oil. The company is assessing how much oil is present, how it can be recovered and what technology may be required to bring it to market.

The next technical choice is whether Antelopus should flow the well or hydraulically fracture it to test productive potential. Rather than relying only on Duarmara-4Z, management said it will examine combined evidence from three wells: Duarmara-4Z and older Oil India wells Duarmara-1 and Duarmara-2. Accessing the older wells safely is part of the evaluation, leaving the oil result at an early appraisal stage rather than a defined field development.

How does Assam’s gas pipeline constraint affect Antelopus?

Antelopus said Assam gas can be produced and processed, but limited evacuation capacity delays revenue generation and can force discounts to APM prices. Assam was not connected to the National Grid at the time of the call, according to management. Available gas-production capacity in the state therefore does not necessarily reach the market, and management noted that some private operators have shut in existing output.

The Duliajan-Numaligarh gas pipeline is central to that constraint, and Antelopus said Duarmara gas evacuation depends on its resolution. Management said the matter is being discussed through Northeast pipeline-connectivity meetings, but had not been untangled and there was no specific update. This distinguishes TIPAM-2 and TIPAM-3 gas from TIPAM-1 oil: gas can be monetised through a facility, but sales volume and price remain structurally constrained.

What could an Antelopus Duarmara oil development cost?

Antelopus estimates a Duarmara well would require about Rs 60 crore to Rs 70 crore of capital expenditure, even if it targets only one reservoir interval. The drilled well cost roughly Rs 70 crore because it pursued three reservoir zones at different depths. Management said the deeper Assam wells reach about 3.5 kilometres, compared with roughly 1.5 kilometres to 1.6 kilometres for wells in the Cambay Basin.

Operating expenditure is not expected to match the Rs 70 crore scale of drilling capital, although Antelopus expects some cost differences between Assam and Gujarat. The company did not provide an operating-cost forecast or an oil-production target. It said it needs to incorporate the views of its joint-venture partner before finalising a plan, unlike wholly operated assets where management alone can make the operating decision.

When will Antelopus disclose its Duarmara plan and production estimate?

Antelopus expects to formulate a full Duarmara plan within five to six months and said it would provide better estimates in the next fiscal year. Management described the current year as a period for determining the nature of the oil discovery, recoverable volumes and the extraction method. That timetable means no production estimate has been attached to the two observed oil circulations.

Duarmara and the newer KG assets make only a minimal contribution to Antelopus’s stated 5,000-barrel-per-day target for FY29, management said. The company therefore said it was reasonably confident in putting the FY29 target into the public domain despite unresolved Duarmara gas infrastructure. This separates the existing production plan from a potential oil development that could add output only after appraisal and partner alignment.

Conclusion

The combined evidence points to a change in Antelopus’s near-term Duarmara emphasis: unexpected light oil in TIPAM-1 offers a route to market by truck, while the originally targeted TIPAM-2 and TIPAM-3 gas zones remain exposed to Assam’s incomplete National Grid connection. The shift does not establish commercial oil volumes, because the company has so far reported only two wellbore oil circulations and is still considering flow testing or fracturing.

The next milestones are Antelopus’s planned five-to-six-month review, its assessment of Duarmara-1, Duarmara-2 and Duarmara-4Z together, and the joint-venture partners’ view on development. Readers should also watch for any disclosed progress on the Duliajan-Numaligarh pipeline, which management identified as the unresolved factor affecting gas evacuation across Assam.