BHP Billiton Ltd. (BHP.AU) moved to secure a foothold in Mexico's oil and gas industry, penning a cooperation agreement with state oil company Petróleos Mexicanos, or Pemex, that the Australian miner hopes will turn into a long-term partnership.

BHP, the world's No. 1 miner by market value, said Friday it has signed a memorandum of understanding to exchange technical knowledge and experience in oil and gas with Pemex as the Melbourne-based company looks to extend its reach in the petroleum industry.

Pemex has been facing outside competition for the first time in its 76-year history after, in the face of falling oil production, the government last year pushed through Congress the constitutional changes needed to allow in big multinational firms with technology and cash.

BHP is meanwhile looking for new petroleum projects, having finished many major developments elsewhere, including the US$1.5 billion Macedon gas project in Western Australia.

"We obviously wouldn't be here if we didn't think the relationship would extend beyond the exchange of technical data," BHP's petroleum president, Tim Cutt, told reporters. Pemex couldn't immediately be reached for comment.

BHP, which controls oil-and-gas assets in countries such as the U.S., Trinidad and Tobago and Pakistan, is expected to become more reliant on the petroleum industry for its earnings after a proposed demerger of many unwanted assets including nickel mines and aluminum smelters. Macquarie recently estimated petroleum will account for 38% of earnings after the planned spin-off, from less than 30% now.

Mr. Cutt said the company has the capacity to take on one or two big petroleum projects globally.

"We see considerable opportunity in Mexico following the recent economic reforms," he said. "This is a long-term opportunity for us."

Pemex, which contributes around a third of federal budget revenue, has for years run Mexico's oil industry with little outside regulation. The new rules end Pemex's monopoly and allow private firms to exploit Mexico's oil and gas through different types of contracts.

Mexico will in February begin auctioning rights to 169 onshore and offshore tracts under energy laws signed last month. The process is expected to be completed by the end of 2015, with both new and mature fields to be put up for bids.

Mr. Cutt said he is still waiting for the exact details of the government's terms for private drilling, though.

Other companies are also signaling their interest, with BG Group Chief Operating Officer Sami Iskander this week labelling it a huge opportunity.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com

Copyright (c) 2014 Dow Jones & Company, Inc.

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